ConditionalNode.java
| Index Score | ||
|---|---|---|
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org.apache.derby.impl.sql.compile |
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Apache Derby |
View: Reasons, Metrics, Source Code
These are the metrics that contribute to the Enerjy Score for this file, ranked by impact. So the metrics listed at the top influence the score to a greater extent that the metrics listed at the bottom.
| Metric | Description | |
|---|---|---|
| JAVA0034 | JAVA0034 Missing braces in if statement |  |
| EXEC_COMMENTS | Comments in executable code | |
| RETURNS | Number of return points from functions | |
| COMMENTS | Comment lines | |
| INTERFACE_COMPLEXITY | Interface complexity | |
| SIZE | Size of the file in bytes | |
| DOC_COMMENT | Number of javadoc comment lines | |
| LINES | Number of lines in the source file | |
| EXITS | Procedure exits | |
| JAVA0177 | JAVA0177 Variable declaration missing initializer | |
| JAVA0075 | JAVA0075 Method parameter hides field | |
| JAVA0130 | JAVA0130 Non-static method does not use instance fields | |
| COMPARISONS | Number of comparison operators | |
| DECL_COMMENTS | Comments in declarations | |
| JAVA0110 | JAVA0110 Incorrect javadoc: no @return tag | |
| OPERANDS | Number of operands | |
| LOC | Lines of code | |
| JAVA0160 | JAVA0160 Method does not throw specified exception | |
| CYCLOMATIC | Cyclomatic complexity | |
| PROGRAM_LENGTH | Halstead program length | |
| PARAMS | Number of formal parameter declarations | |
| ELOC | Effective lines of code | |
| OPERATORS | Number of operators | |
| LINE_COMMENT | Number of line comments | |
| BLOCK_COMMENT | Number of block comment lines | |
| JAVA0145 | JAVA0145 Tab character used in source file | |
| JAVA0117 | JAVA0117 Missing javadoc: method 'method' | |
| JAVA0080 | JAVA0080 Import declaration not used | |
| UNIQUE_OPERANDS | Number of unique operands | |
| PROGRAM_VOCAB | Halstead program vocabulary | |
| PROGRAM_VOLUME | Halstead program volume | |
| JAVA0106 | JAVA0106 Unnecessary import from current package | |
| JAVA0126 | JAVA0126 Method declares unchecked exception in throws | |
| JAVA0171 | JAVA0171 Unused local variable | |
| LOOPS | Number of loops | |
| LOGICAL_LINES | Number of statements | |
| NEST_DEPTH | Maximum nesting depth | |
| JAVA0108 | JAVA0108 Incorrect javadoc: no @param tag for 'parameter' | |
/*
Derby - Class org.apache.derby.impl.sql.compile.ConditionalNode
Licensed to the Apache Software Foundation (ASF) under one or more
contributor license agreements. See the NOTICE file distributed with
this work for additional information regarding copyright ownership.
The ASF licenses this file to you under the Apache License, Version 2.0
(the "License"); you may not use this file except in compliance with
the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package org.apache.derby.impl.sql.compile;
import org.apache.derby.iapi.services.compiler.MethodBuilder;
import org.apache.derby.iapi.services.monitor.Monitor;
import org.apache.derby.iapi.services.sanity.SanityManager;
import org.apache.derby.iapi.error.StandardException;
import org.apache.derby.iapi.sql.dictionary.DataDictionary;
import org.apache.derby.iapi.types.TypeId;
import org.apache.derby.iapi.types.BooleanDataValue;
import org.apache.derby.iapi.types.DataTypeDescriptor;
import org.apache.derby.iapi.types.DataValueFactory;
import org.apache.derby.iapi.reference.SQLState;
import org.apache.derby.iapi.types.DataValueDescriptor;
import org.apache.derby.iapi.types.TypeId;
import org.apache.derby.iapi.services.loader.ClassInspector;
import org.apache.derby.impl.sql.compile.ExpressionClassBuilder;
import org.apache.derby.iapi.sql.compile.Visitable;
import org.apache.derby.iapi.sql.compile.Visitor;
import org.apache.derby.iapi.sql.compile.C_NodeTypes;
import org.apache.derby.iapi.reference.ClassName;
import org.apache.derby.iapi.util.JBitSet;
import org.apache.derby.iapi.services.classfile.VMOpcode;
import java.util.Vector;
/**
* A ConditionalNode represents an if/then/else operator with a single
* boolean expression on the "left" of the operator and a list of expressions on
* the "right". This is used to represent the java conditional (aka immediate if).
*
*/
public class ConditionalNode extends ValueNode
{
ValueNode testCondition;
ValueNodeList thenElseList;
//true means we are here for NULLIF(V1,V2), false means we are here for following
//CASE WHEN BooleanExpression THEN thenExpression ELSE elseExpression END
boolean thisIsNullIfNode;
/**
* Initializer for a ConditionalNode
*
* @param testCondition The boolean test condition
* @param thenElseList ValueNodeList with then and else expressions
*/
public void init(Object testCondition, Object thenElseList, Object thisIsNullIfNode)
{
this.testCondition = (ValueNode) testCondition;
this.thenElseList = (ValueNodeList) thenElseList;
this.thisIsNullIfNode = ((Boolean) thisIsNullIfNode).booleanValue();
}
/**
* Prints the sub-nodes of this object. See QueryTreeNode.java for
* how tree printing is supposed to work.
*
* @param depth The depth of this node in the tree
*/
public void printSubNodes(int depth)
{
if (SanityManager.DEBUG)
{
super.printSubNodes(depth);
if (testCondition != null)
{
printLabel(depth, "testCondition: ");
testCondition.treePrint(depth + 1);
}
if (thenElseList != null)
{
printLabel(depth, "thenElseList: ");
thenElseList.treePrint(depth + 1);
}
}
}
/**
* Checks if the provided node is a CastNode.
*
* @param node The node to check.
* @return True if this node is a CastNode, false otherwise.
*/
private boolean isCastNode(ValueNode node) {
if (node.getNodeType() == C_NodeTypes.CAST_NODE)
return true;
else
return false;
}
/**
* Checks if the provided CastNode is cast to a SQL CHAR type.
*
* @param node The CastNode to check.
* @return True if this CastNode's target type is CHAR,
* false otherwise.
* @throws StandardException
*/
private boolean isCastToChar(ValueNode node) throws StandardException {
if (node.getTypeServices().getTypeName().equals(TypeId.CHAR_NAME))
return true;
else
return false;
}
/**
* Checks to see if the provided node represents
* a parsing of an SQL NULL.
*
* @param node The node to check.
* @return True if this node represents a SQL NULL, false otherwise.
*/
private boolean isNullNode(ValueNode node) {
if (isCastNode(node) &&
(((CastNode)node).castOperand instanceof UntypedNullConstantNode))
return true;
else
return false;
}
/**
* Checks to see if the provided node represents
* a ConditionalNode.
*
* @param node The node to check.
* @return True if this node is a CondtionalNode, false otherwise.
*/
private boolean isConditionalNode(ValueNode node) {
if (node.getNodeType() == C_NodeTypes.CONDITIONAL_NODE)
return true;
else
return false;
}
/**
* Checks to see if oldType should be casted to the newType.
* Returns TRUE if the two DataTypeDescriptors have different
* TypeID's or if the oldType is NULL. Returns FALSE if the newType is
* NULL or if the two Types are identical.
*
* @param newType The type to cast oldType to if they're different.
* @param oldType The type that should be casted to the newType if
* they're different.
* @return False if the newType is null or they have the same
* TypeId, true otherwise.
*/
private boolean shouldCast(DataTypeDescriptor newType,
DataTypeDescriptor oldType) throws StandardException
{
if ((newType != null) &&
((oldType == null) ||
(!oldType.getTypeId().equals(newType.getTypeId()))))
return true;
else
return false;
}
/**
* This method is a 'prebind.' We need to determine what the types of
* the nodes are going to be before we can set all the SQLParsed NULL's
* to the appropriate type. After we bind, however, we want to ignore
* the SQLParsed NULL's which will be bound to CHAR. Also, we might
* have to delve into the CASE Expression tree.
*
* @param thenElseList The thenElseList (recursive method)
* @param fromList The fromList (required for Column References).
*
* @exception StandardException Thrown on error.
*/
private DataTypeDescriptor findType(ValueNodeList thenElseList,
FromList fromList, SubqueryList subqueryList, Vector aggregateVector)
throws StandardException
{
/* We need to "prebind" because we want the Types. Provide
* dummy SubqueryList and AggreateList (we don't care)
*/
ValueNode thenNode =
((ValueNode)thenElseList.elementAt(0)).bindExpression(
fromList, subqueryList, aggregateVector);
ValueNode elseNode =
((ValueNode)thenElseList.elementAt(1)).bindExpression(
fromList, subqueryList, aggregateVector);
DataTypeDescriptor thenType = thenNode.getTypeServices();
DataTypeDescriptor elseType = elseNode.getTypeServices();
DataTypeDescriptor theType = null;
/* If it's not a Cast Node or a Conditional Node, then we'll
* use this type.
*/
if ((thenType != null) && !isCastNode(thenNode)
&& !isConditionalNode(thenNode))
{
return thenType;
}
/* If it's not cast to CHAR it isn't a SQL parsed NULL, so
* we can use it.
*/
if (isCastNode(thenNode) && !isCastToChar(thenNode))
return thenNode.getTypeServices();
/* If we get here, we can't use the THEN node type, so we'll
* use the ELSE node type
*/
if ((elseType != null) && !isCastNode(elseNode)
&& !isConditionalNode(elseNode))
{
return elseType;
}
if (isCastNode(elseNode) && !isCastToChar(elseNode))
return elseNode.getTypeServices();
/* If we get here, it means that we've got a conditional and a
* SQL parsed NULL or two conditionals.
*/
if (isConditionalNode(thenNode))
{
theType =
findType(((ConditionalNode)thenNode).thenElseList, fromList,
subqueryList, aggregateVector);
}
if (theType != null) return theType;
// Two conditionals and the first one was all SQL parsed NULLS.
if (isConditionalNode(elseNode))
{
theType =
findType(((ConditionalNode)elseNode).thenElseList, fromList,
subqueryList, aggregateVector);
}
if (theType != null) return theType;
return null;
}
/**
* This recursive method will hunt through the ValueNodeList thenElseList
* looking for SQL NULL's. If it finds any, it casts them to the provided
* castType.
*
* @param thenElseList The thenElseList to update.
* @param castType The type to cast SQL parsed NULL's too.
* @param fromList FromList to pass on to bindExpression if recast is performed
* @param subqueryList SubqueryList to pass on to bindExpression if recast is performed
* @param aggregateVector AggregateVector to pass on to bindExpression if recast is performed
*
* @exception StandardException Thrown on error.
*/
private void recastNullNodes(ValueNodeList thenElseList,
DataTypeDescriptor castType, FromList fromList,
SubqueryList subqueryList, Vector aggregateVector)
throws StandardException {
// Don't do anything if we couldn't find a castType.
if (castType == null) return;
// need to have nullNodes nullable
castType = castType.getNullabilityType(true);
ValueNode thenNode = (ValueNode)thenElseList.elementAt(0);
ValueNode elseNode = (ValueNode)thenElseList.elementAt(1);
// first check if the "then" node is NULL
if (isNullNode(thenNode) &&
shouldCast(castType, thenNode.getTypeServices()))
{
// recast and rebind. findTypes would have bound as SQL CHAR.
// need to rebind here. (DERBY-3032)
thenElseList.setElementAt(recastNullNode(thenNode, castType), 0);
((ValueNode) thenElseList.elementAt(0)).bindExpression(fromList, subqueryList, aggregateVector);
// otherwise recurse on thenNode, but only if it's a conditional
} else if (isConditionalNode(thenNode)) {
recastNullNodes(((ConditionalNode)thenNode).thenElseList,
castType,fromList, subqueryList, aggregateVector);
}
// lastly, check if the "else" node is NULL
if (isNullNode(elseNode) &&
shouldCast(castType, elseNode.getTypeServices()))
{
// recast and rebind. findTypes would have bound as SQL CHAR.
// need to rebind here. (DERBY-3032)
thenElseList.setElementAt(recastNullNode(elseNode, castType), 1);
((ValueNode) thenElseList.elementAt(1)).bindExpression(fromList, subqueryList, aggregateVector);
// otherwise recurse on elseNode, but only if it's a conditional
} else if (isConditionalNode(elseNode)) {
recastNullNodes(((ConditionalNode)elseNode).thenElseList,
castType,fromList,subqueryList,aggregateVector);
}
}
/**
* recastNullNode casts the nodeToCast node to the typeToUse.
*
* recastNullNode is called by recastNullNodes. It is called when the
* nodeToCast is an UntypedNullConstantNode that's been cast by the
* SQLParser to a CHAR. The node needs to be recasted to the same type
* of the other nodes in order to prevent the type compatibility error
* 42X89 from occuring. SQL Standard requires that:
*
* VALUES CASE WHEN 1=2 THEN 3 ELSE NULL END
*
* returns NULL and not an error message.
*
* @param nodeToCast The node that represents a SQL NULL value.
* @param typeToUse The type which the nodeToCast should be
* recasted too.
*
* @exception StandardException Thrown on error.
*/
private QueryTreeNode recastNullNode(ValueNode nodeToCast,
DataTypeDescriptor typeToUse) throws StandardException
{
QueryTreeNode cast = getNodeFactory().getNode(
C_NodeTypes.CAST_NODE,
((CastNode)nodeToCast).castOperand,
typeToUse,
getContextManager());
return cast;
}
/**
* Bind this expression. This means binding the sub-expressions,
* as well as figuring out what the return type is for this expression.
*
* @param fromList The FROM list for the query this
* expression is in, for binding columns.
* @param subqueryList The subquery list being built as we find SubqueryNodes
* @param aggregateVector The aggregate vector being built as we find AggregateNodes
*
* @return The new top of the expression tree.
*
* @exception StandardException Thrown on error
*/
public ValueNode bindExpression(FromList fromList, SubqueryList subqueryList,
Vector aggregateVector)
throws StandardException
{
testCondition = testCondition.bindExpression(fromList,
subqueryList,
aggregateVector);
if (thisIsNullIfNode) {
//for NULLIF(V1,V2), parser binds thenElseList.elementAt(0) to untyped NULL
//At bind phase, we should bind it to the type of V1 since now we know the
//type of V1
BinaryComparisonOperatorNode bcon = (BinaryComparisonOperatorNode)testCondition;
/*
* NULLIF(V1,V2) is equivalent to:
*
* CASE WHEN V1=V2 THEN NULL ELSE V1 END
*
* The untyped NULL should have a data type descriptor
* that allows its value to be nullable.
*/
QueryTreeNode cast = getNodeFactory().getNode(
C_NodeTypes.CAST_NODE,
thenElseList.elementAt(0),
bcon.getLeftOperand().getTypeServices().getNullabilityType(true),
getContextManager());
thenElseList.setElementAt(cast,0);
thenElseList.bindExpression(fromList,
subqueryList,
aggregateVector);
} else {
/* Following call to "findType()" and "recastNullNodes" will indirectly bind the
* expressions in the thenElseList, so no need to call
* "thenElseList.bindExpression(...)" after we do this.
* DERBY-2986.
*/
recastNullNodes(thenElseList,
findType(thenElseList, fromList, subqueryList, aggregateVector),fromList,
subqueryList,
aggregateVector);
}
// Can't get the then and else expressions until after they've been bound
// expressions have been bound by findType and rebound by recastNullNodes if needed.
ValueNode thenExpression = (ValueNode) thenElseList.elementAt(0);
ValueNode elseExpression = (ValueNode) thenElseList.elementAt(1);
/* testCondition must be a boolean expression.
* If it is a ? parameter on the left, then set type to boolean,
* otherwise verify that the result type is boolean.
*/
if (testCondition.requiresTypeFromContext())
{
testCondition.setType(
new DataTypeDescriptor(
TypeId.BOOLEAN_ID,
true));
}
else
{
if ( ! testCondition.getTypeServices().getTypeId().equals(
TypeId.BOOLEAN_ID))
{
throw StandardException.newException(SQLState.LANG_CONDITIONAL_NON_BOOLEAN);
}
}
/* We can't determine the type for the result expression if
* all result expressions are ?s.
*/
if (thenElseList.containsAllParameterNodes())
{
throw StandardException.newException(SQLState.LANG_ALL_RESULT_EXPRESSIONS_PARAMS, "conditional");
}
else if (thenElseList.containsParameterNode())
{
/* Set the parameter's type to be the same as the other element in
* the list
*/
DataTypeDescriptor dts;
ValueNode typeExpression;
if (thenExpression.requiresTypeFromContext())
{
dts = elseExpression.getTypeServices();
}
else
{
dts = thenExpression.getTypeServices();
}
thenElseList.setParameterDescriptor(dts);
}
/* The then and else expressions must be type compatible */
ClassInspector cu = getClassFactory().getClassInspector();
/*
** If it is comparable, then we are ok. Note that we
** could in fact allow any expressions that are convertible()
** since we are going to generate a cast node, but that might
** be confusing to users...
*/
// RESOLVE DJDOI - this looks wrong, why should the then expression
// be comparable to the then expression ??
if (! thenExpression.getTypeServices().
comparable(elseExpression.getTypeServices(), false, getClassFactory()) &&
! cu.assignableTo(thenExpression.getTypeId().getCorrespondingJavaTypeName(),
elseExpression.getTypeId().getCorrespondingJavaTypeName()) &&
! cu.assignableTo(elseExpression.getTypeId().getCorrespondingJavaTypeName(),
thenExpression.getTypeId().getCorrespondingJavaTypeName()))
{
throw StandardException.newException(SQLState.LANG_NOT_TYPE_COMPATIBLE,
thenExpression.getTypeId().getSQLTypeName(),
elseExpression.getTypeId().getSQLTypeName()
);
}
/*
** Set the result type of this conditional to be the dominant type
** of the result expressions.
*/
setType(thenElseList.getDominantTypeServices());
/*
** Generate a CastNode if necessary and
** stick it over the original expression
*/
TypeId condTypeId = getTypeId();
TypeId thenTypeId = ((ValueNode) thenElseList.elementAt(0)).getTypeId();
TypeId elseTypeId = ((ValueNode) thenElseList.elementAt(1)).getTypeId();
/* Need to generate conversion if thenExpr or elseExpr is not of
* dominant type. (At least 1 of them must be of the dominant type.)
*/
if (thenTypeId.typePrecedence() != condTypeId.typePrecedence())
{
ValueNode cast = (ValueNode) getNodeFactory().getNode(
C_NodeTypes.CAST_NODE,
thenElseList.elementAt(0),
getTypeServices(), // cast to dominant type
getContextManager());
cast = cast.bindExpression(fromList,
subqueryList,
aggregateVector);
thenElseList.setElementAt(cast, 0);
}
else if (elseTypeId.typePrecedence() != condTypeId.typePrecedence())
{
ValueNode cast = (ValueNode) getNodeFactory().getNode(
C_NodeTypes.CAST_NODE,
thenElseList.elementAt(1),
getTypeServices(), // cast to dominant type
getContextManager());
cast = cast.bindExpression(fromList,
subqueryList,
aggregateVector);
thenElseList.setElementAt(cast, 1);
}
return this;
}
/**
* Preprocess an expression tree. We do a number of transformations
* here (including subqueries, IN lists, LIKE and BETWEEN) plus
* subquery flattening.
* NOTE: This is done before the outer ResultSetNode is preprocessed.
*
* @param numTables Number of tables in the DML Statement
* @param outerFromList FromList from outer query block
* @param outerSubqueryList SubqueryList from outer query block
* @param outerPredicateList PredicateList from outer query block
*
* @return The modified expression
*
* @exception StandardException Thrown on error
*/
public ValueNode preprocess(int numTables,
FromList outerFromList,
SubqueryList outerSubqueryList,
PredicateList outerPredicateList)
throws StandardException
{
testCondition = testCondition.preprocess(numTables,
outerFromList, outerSubqueryList,
outerPredicateList);
thenElseList.preprocess(numTables,
outerFromList, outerSubqueryList,
outerPredicateList);
return this;
}
/**
* Categorize this predicate. Initially, this means
* building a bit map of the referenced tables for each predicate.
* If the source of this ColumnReference (at the next underlying level)
* is not a ColumnReference or a VirtualColumnNode then this predicate
* will not be pushed down.
*
* For example, in:
* select * from (select 1 from s) a (x) where x = 1
* we will not push down x = 1.
* NOTE: It would be easy to handle the case of a constant, but if the
* inner SELECT returns an arbitrary expression, then we would have to copy
* that tree into the pushed predicate, and that tree could contain
* subqueries and method calls.
* RESOLVE - revisit this issue once we have views.
*
* @param referencedTabs JBitSet with bit map of referenced FromTables
* @param simplePredsOnly Whether or not to consider method
* calls, field references and conditional nodes
* when building bit map
*
* @return boolean Whether or not source.expression is a ColumnReference
* or a VirtualColumnNode.
* @exception StandardException Thrown on error
*/
public boolean categorize(JBitSet referencedTabs, boolean simplePredsOnly)
throws StandardException
{
/* We stop here when only considering simple predicates
* as we don't consider conditional operators when looking
* for null invariant predicates.
*/
if (simplePredsOnly)
{
return false;
}
boolean pushable;
pushable = testCondition.categorize(referencedTabs, simplePredsOnly);
pushable = (thenElseList.categorize(referencedTabs, simplePredsOnly) && pushable);
return pushable;
}
/**
* Remap all ColumnReferences in this tree to be clones of the
* underlying expression.
*
* @return ValueNode The remapped expression tree.
*
* @exception StandardException Thrown on error
*/
public ValueNode remapColumnReferencesToExpressions()
throws StandardException
{
testCondition = testCondition.remapColumnReferencesToExpressions();
thenElseList = thenElseList.remapColumnReferencesToExpressions();
return this;
}
/**
* Return whether or not this expression tree represents a constant expression.
*
* @return Whether or not this expression tree represents a constant expression.
*/
public boolean isConstantExpression()
{
return (testCondition.isConstantExpression() &&
thenElseList.isConstantExpression());
}
/** @see ValueNode#constantExpression */
public boolean constantExpression(PredicateList whereClause)
{
return (testCondition.constantExpression(whereClause) &&
thenElseList.constantExpression(whereClause));
}
/**
* Eliminate NotNodes in the current query block. We traverse the tree,
* inverting ANDs and ORs and eliminating NOTs as we go. We stop at
* ComparisonOperators and boolean expressions. We invert
* ComparisonOperators and replace boolean expressions with
* boolean expression = false.
* NOTE: Since we do not recurse under ComparisonOperators, there
* still could be NotNodes left in the tree.
*
* @param underNotNode Whether or not we are under a NotNode.
*
*
* @return The modified expression
*
* @exception StandardException Thrown on error
*/
ValueNode eliminateNots(boolean underNotNode)
throws StandardException
{
ValueNode thenExpression;
ValueNode elseExpression;
if (! underNotNode)
{
return this;
}
/* Simply swap the then and else expressions */
thenExpression = (ValueNode) thenElseList.elementAt(0);
elseExpression = (ValueNode) thenElseList.elementAt(1);
thenElseList.setElementAt(elseExpression, 0);
thenElseList.setElementAt(thenExpression, 1);
return this;
}
/**
* Do code generation for this conditional expression.
*
* @param acb The ExpressionClassBuilder for the class we're generating
* @param mb The method the expression will go into
*
* @exception StandardException Thrown on error
*/
public void generateExpression(ExpressionClassBuilder acb,
MethodBuilder mb)
throws StandardException
{
testCondition.generateExpression(acb, mb);
mb.cast(ClassName.BooleanDataValue);
mb.push(true);
mb.callMethod(VMOpcode.INVOKEINTERFACE, (String) null, "equals", "boolean", 1);
mb.conditionalIf();
((ValueNode) thenElseList.elementAt(0)).generateExpression(acb, mb);
mb.startElseCode();
((ValueNode) thenElseList.elementAt(1)).generateExpression(acb, mb);
mb.completeConditional();
}
/**
* Accept a visitor, and call v.visit()
* on child nodes as necessary.
*
* @param v the visitor
*
* @exception StandardException on error
*/
public Visitable accept(Visitor v)
throws StandardException
{
Visitable returnNode = v.visit(this);
if (v.skipChildren(this))
{
return returnNode;
}
if (testCondition != null && !v.stopTraversal())
{
testCondition = (ValueNode)testCondition.accept(v);
}
if (thenElseList != null && !v.stopTraversal())
{
thenElseList = (ValueNodeList)thenElseList.accept(v);
}
return returnNode;
}
/**
* {@inheritDoc}
*/
protected boolean isEquivalent(ValueNode o) throws StandardException
{
if (isSameNodeType(o))
{
ConditionalNode other = (ConditionalNode)o;
if (thenElseList.size() == other.thenElseList.size()
&& (testCondition.isEquivalent(other.testCondition)))
{
int sz = thenElseList.size();
for (int i = 0; i < sz; i++)
{
ValueNode v1 = (ValueNode)thenElseList.elementAt(i);
ValueNode v2 = (ValueNode)other.thenElseList.elementAt(i);
if (!v1.isEquivalent(v2))
{
return false;
}
}
return true;
}
}
return false;
}
}
The table below shows all metrics for ConditionalNode.java.
| Metric | Value | Description | |
|---|---|---|---|
| BLOCKS | 52.00 | Number of blocks | |
| BLOCK_COMMENT | 81.00 | Number of block comment lines | |
| COMMENTS | 305.00 | Comment lines | |
| COMMENT_DENSITY | 1.06 | Comment density | |
| COMPARISONS | 55.00 | Number of comparison operators | |
| CYCLOMATIC | 75.00 | Cyclomatic complexity | |
| DECL_COMMENTS | 23.00 | Comments in declarations | |
| DOC_COMMENT | 204.00 | Number of javadoc comment lines | |
| ELOC | 287.00 | Effective lines of code | |
| EXEC_COMMENTS | 29.00 | Comments in executable code | |
| EXITS | 68.00 | Procedure exits | |
| FUNCTIONS | 20.00 | Number of function declarations | |
| HALSTEAD_DIFFICULTY | 74.24 | Halstead difficulty | |
| HALSTEAD_EFFORT | 0.00 | Halstead effort | |
| INTERFACE_COMPLEXITY | 128.00 | Interface complexity | |
| JAVA0001 | 0.00 | JAVA0001 Package name does not contain only lower case letters | |
| JAVA0002 | 0.00 | JAVA0002 Package name does not begin with a top level domain name or country code | |
| JAVA0003 | 0.00 | JAVA0003 Minimize use of on-demand (.*) imports | |
| JAVA0004 | 0.00 | JAVA0004 Unnecessary import from java.lang | |
| JAVA0005 | 1.00 | JAVA0005 Imports not in specified order | |
| JAVA0006 | 0.00 | JAVA0006 Empty finally block | |
| JAVA0007 | 0.00 | JAVA0007 Should not declare public field | |
| JAVA0008 | 0.00 | JAVA0008 Empty catch block | |
| JAVA0009 | 0.00 | JAVA0009 Protected member in final class | |
| JAVA0010 | 0.00 | JAVA0010 Non-instantiable class does not contain a non-private static member | |
| JAVA0011 | 0.00 | JAVA0011 Abstract class does not contain an abstract method | |
| JAVA0012 | 0.00 | JAVA0012 Non-constructor method with same name as declaring class | |
| JAVA0013 | 0.00 | JAVA0013 Non-blank final field is not static | |
| JAVA0014 | 0.00 | JAVA0014 Class with only static members has non-private constructor | |
| JAVA0015 | 0.00 | JAVA0015 Package class contains public nested type | |
| JAVA0016 | 0.00 | JAVA0016 Abstract class contains public constructor | |
| JAVA0017 | 0.00 | JAVA0017 Class name does not have required form | |
| JAVA0018 | 0.00 | JAVA0018 Method name does not have required form | |
| JAVA0019 | 0.00 | JAVA0019 Interface name does not have required form | |
| JAVA0020 | 0.00 | JAVA0020 Field name does not have required form | |
| JAVA0021 | 0.00 | JAVA0021 Interface method name does not have required form | |
| JAVA0022 | 0.00 | JAVA0022 Static final field name does not have required form | |
| JAVA0023 | 0.00 | JAVA0023 Empty finalize method | |
| JAVA0024 | 0.00 | JAVA0024 Empty class | |
| JAVA0025 | 0.00 | JAVA0025 Method override is empty | |
| JAVA0026 | 0.00 | JAVA0026 Finalize method with parameters | |
| JAVA0029 | 0.00 | JAVA0029 Private method not used | |
| JAVA0030 | 0.00 | JAVA0030 Private field not used | |
| JAVA0031 | 0.00 | JAVA0031 Case statement not properly closed | |
| JAVA0032 | 0.00 | JAVA0032 Switch statement missing default | |
| JAVA0033 | 0.00 | JAVA0033 default: not last case in switch statement | |
| JAVA0034 | 15.00 | JAVA0034 Missing braces in if statement | |
| JAVA0035 | 0.00 | JAVA0035 Missing braces in for statement | |
| JAVA0036 | 0.00 | JAVA0036 Missing braces in while statement | |
| JAVA0038 | 0.00 | JAVA0038 Non-case label in switch statement | |
| JAVA0039 | 0.00 | JAVA0039 Break statement with label | |
| JAVA0040 | 0.00 | JAVA0040 Switch statement contains N cases (maximum: M) | |
| JAVA0041 | 0.00 | JAVA0041 Nested synchronized block | |
| JAVA0042 | 0.00 | JAVA0042 Empty synchronized statement | |
| JAVA0043 | 0.00 | JAVA0043 Inner class does not use outer class | |
| JAVA0044 | 0.00 | JAVA0044 Serializable class with no instance variables | |
| JAVA0045 | 0.00 | JAVA0045 Serializable class with only transient fields | |
| JAVA0046 | 0.00 | JAVA0046 Name of class not derived from Exception ends with 'Exception' | |
| JAVA0047 | 0.00 | JAVA0047 Serializable class derives from invalid base class | |
| JAVA0048 | 0.00 | JAVA0048 Name of class derived from Exception does not end with 'Exception' | |
| JAVA0049 | 0.00 | JAVA0049 Nested block at depth N (maximum: M) | |
| JAVA0050 | 0.00 | JAVA0050 Class derives from java.lang.Error | |
| JAVA0051 | 0.00 | JAVA0051 Class derives from java.lang.RuntimeException | |
| JAVA0052 | 0.00 | JAVA0052 Class derives from java.lang.Throwable | |
| JAVA0053 | 0.00 | JAVA0053 Unused label | |
| JAVA0054 | 0.00 | JAVA0054 Inheritance depth N exceeds maximum M | |
| JAVA0055 | 0.00 | JAVA0055 Class should be interface | |
| JAVA0056 | 0.00 | JAVA0056 Unnecessary abstract modifier for interface or annotation | |
| JAVA0057 | 0.00 | JAVA0057 Unnecessary default constructor | |
| JAVA0058 | 0.00 | JAVA0058 Constructor calls super() | |
| JAVA0059 | 0.00 | JAVA0059 Method override only calls super() | |
| JAVA0061 | 0.00 | JAVA0061 Inaccessible member in anonymous class | |
| JAVA0062 | 0.00 | JAVA0062 Public class missing public member or protected constructor | |
| JAVA0063 | 0.00 | JAVA0063 Identifier name should not contain '$' | |
| JAVA0064 | 0.00 | JAVA0064 N variations of identifier name (maximum: M) | |
| JAVA0065 | 0.00 | JAVA0065 Unnecessary final modifier for method in final class | |
| JAVA0066 | 0.00 | JAVA0066 Unnecessary modifier for interface nested type | |
| JAVA0067 | 0.00 | JAVA0067 Array descriptor on identifier name | |
| JAVA0068 | 0.00 | JAVA0068 Modifiers not declared in recommended order | |
| JAVA0071 | 0.00 | JAVA0071 Strings compared with == | |
| JAVA0073 | 0.00 | JAVA0073 Integer division in floating-point context | |
| JAVA0074 | 0.00 | JAVA0074 Use of Object.notify() | |
| JAVA0075 | 5.00 | JAVA0075 Method parameter hides field | |
| JAVA0076 | 0.00 | JAVA0076 Use of magic number | |
| JAVA0077 | 0.00 | JAVA0077 Private field not used in declaring class | |
| JAVA0078 | 0.00 | JAVA0078 Floating point values compared with == | |
| JAVA0079 | 0.00 | JAVA0079 Use of instance to reference static member | |
| JAVA0080 | 5.00 | JAVA0080 Import declaration not used | |
| JAVA0081 | 0.00 | JAVA0081 Boolean literal in comparison | |
| JAVA0082 | 0.00 | JAVA0082 Unnecessary widening cast | |
| JAVA0083 | 0.00 | JAVA0083 Unnecessary instanceof test | |
| JAVA0084 | 0.00 | JAVA0084 Should use compound assignment operator | |
| JAVA0085 | 0.00 | JAVA0085 Use of sun.* class | |
| JAVA0087 | 0.00 | JAVA0087 Use of Thread.sleep() | |
| JAVA0089 | 0.00 | JAVA0089 Use of restricted package | |
| JAVA0092 | 0.00 | JAVA0092 Use of restricted type | |
| JAVA0093 | 0.00 | JAVA0093 Redundant assignment | |
| JAVA0094 | 0.00 | JAVA0094 Field hides a superclass field | |
| JAVA0095 | 0.00 | JAVA0095 Uninitialized private field | |
| JAVA0096 | 0.00 | JAVA0096 Field in nested class hides outer field | |
| JAVA0098 | 1.00 | JAVA0098 Minimize use of implicit field initializers | |
| JAVA0100 | 0.00 | JAVA0100 Class contains N non-final fields (maximum: M) | |
| JAVA0101 | 0.00 | JAVA0101 Unnecessary modifier for field in interface | |
| JAVA0102 | 0.00 | JAVA0102 Last statement in finalize() not super.finalize() | |
| JAVA0103 | 0.00 | JAVA0103 Explicit call to finalize() | |
| JAVA0104 | 0.00 | JAVA0104 finalize() only calls super.finalize() | |
| JAVA0105 | 1.00 | JAVA0105 Duplicate import declaration | |
| JAVA0106 | 1.00 | JAVA0106 Unnecessary import from current package | |
| JAVA0108 | 2.00 | JAVA0108 Incorrect javadoc: no @param tag for 'parameter' | |
| JAVA0109 | 0.00 | JAVA0109 Incorrect javadoc: no parameter 'parameter' | |
| JAVA0110 | 4.00 | JAVA0110 Incorrect javadoc: no @return tag | |
| JAVA0111 | 0.00 | JAVA0111 Incorrect javadoc: @return tag for void method | |
| JAVA0112 | 0.00 | JAVA0112 Incorrect javadoc: no exception 'exception' in throws | |
| JAVA0113 | 1.00 | JAVA0113 Incorrect javadoc: no @author tag | |
| JAVA0114 | 1.00 | JAVA0114 Incorrect javadoc: no @version tag | |
| JAVA0115 | 1.00 | JAVA0115 Incorrect javadoc: no @throws or @exception tag for 'exception' | |
| JAVA0116 | 0.00 | JAVA0116 Missing javadoc: field 'field' | |
| JAVA0117 | 0.00 | JAVA0117 Missing javadoc: method 'method' | |
| JAVA0118 | 0.00 | JAVA0118 Missing javadoc: type 'type' | |
| JAVA0119 | 0.00 | JAVA0119 Control variable changed within body of for loop | |
| JAVA0123 | 0.00 | JAVA0123 Use all three components of for loop | |
| JAVA0125 | 0.00 | JAVA0125 Continue statement with label | |
| JAVA0126 | 0.00 | JAVA0126 Method declares unchecked exception in throws | |
| JAVA0128 | 0.00 | JAVA0128 Public constructor in non-public class | |
| JAVA0130 | 4.00 | JAVA0130 Non-static method does not use instance fields | |
| JAVA0131 | 0.00 | JAVA0131 Compatible method does not override base | |
| JAVA0132 | 0.00 | JAVA0132 Method overload with compatible signature | |
| JAVA0133 | 0.00 | JAVA0133 Non-synchronized method overrides synchronized method | |
| JAVA0135 | 0.00 | JAVA0135 Only one of Object.equals and Object.hashCode defined: missing 'method' | |
| JAVA0136 | 0.00 | JAVA0136 N methods defined in class (maximum: M) | |
| JAVA0137 | 1.00 | JAVA0137 Non-abstract class missing constructor | |
| JAVA0138 | 0.00 | JAVA0138 N parameters defined for method (maximum: M) | |
| JAVA0139 | 0.00 | JAVA0139 Definition of main other than public static void main(java.lang.String[]) | |
| JAVA0141 | 0.00 | JAVA0141 Unnecessary modifier for method in interface | |
| JAVA0143 | 0.00 | JAVA0143 Synchronized method | |
| JAVA0144 | 0.00 | JAVA0144 Line exceeds maximum M characters | |
| JAVA0145 | 1538.00 | JAVA0145 Tab character used in source file | |
| JAVA0150 | 0.00 | JAVA0150 java.lang.Error (or subclass) thrown | |
| JAVA0153 | 0.00 | JAVA0153 Inefficient conversion of integer to string | |
| JAVA0159 | 0.00 | JAVA0159 Inefficient conversion of string to integer | |
| JAVA0160 | 2.00 | JAVA0160 Method does not throw specified exception | |
| JAVA0161 | 0.00 | JAVA0161 Conditional wait() not in loop | |
| JAVA0163 | 0.00 | JAVA0163 Empty statement | |
| JAVA0165 | 0.00 | JAVA0165 Conflicting return statement in finally block | |
| JAVA0166 | 0.00 | JAVA0166 Generic exception caught | |
| JAVA0167 | 0.00 | JAVA0167 ThreadDeath not rethrown | |
| JAVA0169 | 0.00 | JAVA0169 Unnecessary catch block: exception 'exception' | |
| JAVA0170 | 0.00 | JAVA0170 Caught exception not derived from java.lang.Exception | |
| JAVA0171 | 1.00 | JAVA0171 Unused local variable | |
| JAVA0173 | 0.00 | JAVA0173 Unused method parameter | |
| JAVA0174 | 0.00 | JAVA0174 Assigned local variable never used | |
| JAVA0175 | 0.00 | JAVA0175 Successive assignment to variable | |
| JAVA0176 | 0.00 | JAVA0176 Local variable name does not have required form | |
| JAVA0177 | 5.00 | JAVA0177 Variable declaration missing initializer | |
| JAVA0179 | 0.00 | JAVA0179 Local variable hides visible field | |
| JAVA0233 | 0.00 | JAVA0233 Definition of serialVersionUID other than 'private static final long serialVersionUID' | |
| JAVA0234 | 0.00 | JAVA0234 Class is Serializable but does not define serialVersionUID | |
| JAVA0235 | 0.00 | JAVA0235 Class defines serialVersionUID but does not implement Serializable | |
| JAVA0236 | 0.00 | JAVA0236 Attempt to clone an object which does not implement Cloneable | |
| JAVA0237 | 0.00 | JAVA0237 Class implements Cloneable but does not have public clone method | |
| JAVA0238 | 0.00 | JAVA0238 Clone method does not call super.clone() | |
| JAVA0239 | 0.00 | JAVA0239 Class declares 'readObject' or 'writeObject' but does not implement Serializable | |
| JAVA0240 | 0.00 | JAVA0240 Serializable class which declares readObject or writeObject but not both | |
| JAVA0241 | 0.00 | JAVA0241 'readObject' or 'writeObject' should be declared private in Serializable class | |
| JAVA0242 | 0.00 | JAVA0242 Transient field in non-Serializable class | |
| JAVA0243 | 0.00 | JAVA0243 'readResolve' or 'writeReplace' should be declared private or protected | |
| JAVA0244 | 0.00 | JAVA0244 Field or method name in subclass differs only by case from inherited field or method | |
| JAVA0245 | 0.00 | JAVA0245 JUnit TestCase with non-trivial constructor | |
| JAVA0246 | 0.00 | JAVA0246 JUnit assertXXX statement missing message parameter | |
| JAVA0247 | 0.00 | JAVA0247 JUnit 'setUp()' and 'tearDown()' should call super method | |
| JAVA0248 | 0.00 | JAVA0248 JUnit method 'setUp' or 'tearDown' with incorrect signature | |
| JAVA0249 | 0.00 | JAVA0249 JUnit TestCase 'suite()' should be declared static | |
| JAVA0250 | 0.00 | JAVA0250 JUnit TestCase declares testXXX method with incorrect signature | |
| JAVA0251 | 0.00 | JAVA0251 Use '%n' for line breaks in printf/format for platform independence | |
| JAVA0252 | 0.00 | JAVA0252 'enum' is a Java 1.5 reserved word | |
| JAVA0253 | 0.00 | JAVA0253 Not all enum constants consumed in switch statement | |
| JAVA0254 | 0.00 | JAVA0254 Use enhanced for loop construct instead of Iterator | |
| JAVA0255 | 0.00 | JAVA0255 Result of method invocation not used | |
| JAVA0256 | 0.00 | JAVA0256 Assignment of external collection/array to field | |
| JAVA0257 | 0.00 | JAVA0257 Use of 'Constant Interface' anti-pattern | |
| JAVA0258 | 0.00 | JAVA0258 Implement Iterable for foreach compatibility | |
| JAVA0259 | 0.00 | JAVA0259 Return of collection/array field | |
| JAVA0260 | 0.00 | JAVA0260 Use 'enum' instead of Enumerated Type pattern | |
| JAVA0261 | 0.00 | JAVA0261 Use specialized Enum collection types | |
| JAVA0262 | 0.00 | JAVA0262 Use of char in integer context | |
| JAVA0263 | 0.00 | JAVA0263 Long literal ends with 'l' instead of 'L' | |
| JAVA0264 | 0.00 | JAVA0264 Integer math in long context - check for overflow | |
| JAVA0265 | 0.00 | JAVA0265 Use of Throwable.printStackTrace() | |
| JAVA0266 | 0.00 | JAVA0266 Use of System.out | |
| JAVA0267 | 0.00 | JAVA0267 Use of System.err | |
| JAVA0269 | 0.00 | JAVA0269 Contents of StringBuffer never used | |
| JAVA0270 | 0.00 | JAVA0270 Use Java 5.0 enhanced for loop construct to iterate over all elements in an array | |
| JAVA0271 | 0.00 | JAVA0271 Minimize use of on-demand (.*) static imports | |
| JAVA0272 | 0.00 | JAVA0272 Thread.run() called | |
| JAVA0273 | 0.00 | JAVA0273 Non-final derivative of Thread calls start() in constructor | |
| JAVA0274 | 0.00 | JAVA0274 Serializable class has a synchronized readObject() | |
| JAVA0275 | 0.00 | JAVA0275 Serializable class has a synchronized writeObject() and no other synchronized methods | |
| JAVA0276 | 0.00 | JAVA0276 Unnecessary use of String constructor | |
| JAVA0277 | 0.00 | JAVA0277 Iterator.next() implementation does not throw NoSuchElementException | |
| JAVA0278 | 0.00 | JAVA0278 Unnecessary use of Boolean constructor | |
| JAVA0279 | 0.00 | JAVA0279 Serialization method readObject or readObjectNoData calls an overridable method | |
| JAVA0280 | 0.00 | JAVA0280 IllegalMonitorStateException caught | |
| JAVA0281 | 0.00 | JAVA0281 Iterator.next() not called in loop | |
| JAVA0282 | 0.00 | JAVA0282 Call to Iterator.next() in loop which does not test Iterator.hasNext() | |
| JAVA0283 | 0.00 | JAVA0283 Control variable not updated in loop body | |
| JAVA0284 | 0.00 | JAVA0284 Explicit garbage collection | |
| JAVA0285 | 0.00 | JAVA0285 Dereference of potentially null variable | |
| JAVA0286 | 0.00 | JAVA0286 Dereference of null variable | |
| JAVA0287 | 0.00 | JAVA0287 Unnecessary null check | |
| JAVA0288 | 0.00 | JAVA0288 Inconsistent null check | |
| LINES | 778.00 | Number of lines in the source file | |
| LINE_COMMENT | 20.00 | Number of line comments | |
| LOC | 381.00 | Lines of code | |
| LOGICAL_LINES | 142.00 | Number of statements | |
| LOOPS | 1.00 | Number of loops | |
| NEST_DEPTH | 5.00 | Maximum nesting depth | |
| OPERANDS | 849.00 | Number of operands | |
| OPERATORS | 1511.00 | Number of operators | |
| PARAMS | 36.00 | Number of formal parameter declarations | |
| PROGRAM_LENGTH | 2360.00 | Halstead program length | |
| PROGRAM_VOCAB | 262.00 | Halstead program vocabulary | |
| PROGRAM_VOLUME | 0.00 | Halstead program volume | |
| RETURNS | 92.00 | Number of return points from functions | |
| SIZE | 24775.00 | Size of the file in bytes | |
| UNIQUE_OPERANDS | 223.00 | Number of unique operands | |
| UNIQUE_OPERATORS | 39.00 | Number of unique operators | |
| WHITESPACE | 92.00 | Number of whitespace lines | |