NestedLoopJoinStrategy.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 | |
|---|---|---|
| JAVA0110 | JAVA0110 Incorrect javadoc: no @return tag |  |
| PARAMS | Number of formal parameter declarations | |
| JAVA0034 | JAVA0034 Missing braces in if statement | |
| JAVA0138 | JAVA0138 N parameters defined for method (maximum: M) | |
| INTERFACE_COMPLEXITY | Interface complexity | |
| PROGRAM_VOLUME | Halstead program volume | |
| JAVA0106 | JAVA0106 Unnecessary import from current package | |
| JAVA0126 | JAVA0126 Method declares unchecked exception in throws | |
| JAVA0285 | JAVA0285 Dereference of potentially null variable | |
| LINE_COMMENT | Number of line comments | |
| JAVA0117 | JAVA0117 Missing javadoc: method 'method' | |
| COMPARISONS | Number of comparison operators | |
| DECL_COMMENTS | Comments in declarations | |
| JAVA0108 | JAVA0108 Incorrect javadoc: no @param tag for 'parameter' | |
| LOGICAL_LINES | Number of statements | |
| WHITESPACE | Number of whitespace lines | |
| EXEC_COMMENTS | Comments in executable code | |
| LOOPS | Number of loops | |
| NEST_DEPTH | Maximum nesting depth | |
| CYCLOMATIC | Cyclomatic complexity | |
| DOC_COMMENT | Number of javadoc comment lines | |
| OPERATORS | Number of operators | |
/*
Derby - Class org.apache.derby.impl.sql.compile.NestedLoopJoinStrategy
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.sql.compile.CostEstimate;
import org.apache.derby.iapi.sql.compile.ExpressionClassBuilderInterface;
import org.apache.derby.iapi.sql.compile.JoinStrategy;
import org.apache.derby.iapi.sql.compile.Optimizable;
import org.apache.derby.iapi.sql.compile.Optimizer;
import org.apache.derby.iapi.sql.compile.OptimizablePredicateList;
import org.apache.derby.iapi.sql.compile.OptimizablePredicate;
import org.apache.derby.iapi.sql.dictionary.DataDictionary;
import org.apache.derby.iapi.sql.dictionary.ConglomerateDescriptor;
import org.apache.derby.iapi.store.access.StoreCostController;
import org.apache.derby.iapi.store.access.TransactionController;
import org.apache.derby.iapi.services.compiler.MethodBuilder;
import org.apache.derby.impl.sql.compile.ExpressionClassBuilder;
import org.apache.derby.iapi.error.StandardException;
import org.apache.derby.iapi.services.sanity.SanityManager;
public class NestedLoopJoinStrategy extends BaseJoinStrategy {
public NestedLoopJoinStrategy() {
}
/**
* @see JoinStrategy#feasible
*
* @exception StandardException Thrown on error
*/
public boolean feasible(Optimizable innerTable,
OptimizablePredicateList predList,
Optimizer optimizer
)
throws StandardException
{
/* Nested loop is feasible, except in the corner case
* where innerTable is a VTI that cannot be materialized
* (because it has a join column as a parameter) and
* it cannot be instantiated multiple times.
* RESOLVE - Actually, the above would work if all of
* the tables outer to innerTable were 1 row tables, but
* we don't have that info yet, and it should probably
* be hidden in inner table somewhere.
* NOTE: A derived table that is correlated with an outer
* query block is not materializable, but it can be
* "instantiated" multiple times because that only has
* meaning for VTIs.
*/
if (innerTable.isMaterializable())
{
return true;
}
if (innerTable.supportsMultipleInstantiations())
{
return true;
}
return false;
}
/** @see JoinStrategy#multiplyBaseCostByOuterRows */
public boolean multiplyBaseCostByOuterRows() {
return true;
}
/**
* @see JoinStrategy#getBasePredicates
*
* @exception StandardException Thrown on error
*/
public OptimizablePredicateList getBasePredicates(
OptimizablePredicateList predList,
OptimizablePredicateList basePredicates,
Optimizable innerTable)
throws StandardException {
if (SanityManager.DEBUG) {
SanityManager.ASSERT(basePredicates == null ||
basePredicates.size() == 0,
"The base predicate list should be empty.");
}
if (predList != null) {
predList.transferAllPredicates(basePredicates);
basePredicates.classify(innerTable,
innerTable.getCurrentAccessPath().getConglomerateDescriptor());
}
return basePredicates;
}
/** @see JoinStrategy#nonBasePredicateSelectivity */
public double nonBasePredicateSelectivity(
Optimizable innerTable,
OptimizablePredicateList predList) {
/*
** For nested loop, all predicates are base predicates, so there
** is no extra selectivity.
*/
return 1.0;
}
/**
* @see JoinStrategy#putBasePredicates
*
* @exception StandardException Thrown on error
*/
public void putBasePredicates(OptimizablePredicateList predList,
OptimizablePredicateList basePredicates)
throws StandardException {
for (int i = basePredicates.size() - 1; i >= 0; i--) {
OptimizablePredicate pred = basePredicates.getOptPredicate(i);
predList.addOptPredicate(pred);
basePredicates.removeOptPredicate(i);
}
}
/* @see JoinStrategy#estimateCost */
public void estimateCost(Optimizable innerTable,
OptimizablePredicateList predList,
ConglomerateDescriptor cd,
CostEstimate outerCost,
Optimizer optimizer,
CostEstimate costEstimate) {
costEstimate.multiply(outerCost.rowCount(), costEstimate);
optimizer.trace(Optimizer.COST_OF_N_SCANS, innerTable.getTableNumber(), 0, outerCost.rowCount(),
costEstimate);
}
/** @see JoinStrategy#maxCapacity */
public int maxCapacity( int userSpecifiedCapacity,
int maxMemoryPerTable,
double perRowUsage) {
return Integer.MAX_VALUE;
}
/** @see JoinStrategy#getName */
public String getName() {
return "NESTEDLOOP";
}
/** @see JoinStrategy#scanCostType */
public int scanCostType() {
return StoreCostController.STORECOST_SCAN_NORMAL;
}
/** @see JoinStrategy#resultSetMethodName */
public String resultSetMethodName(boolean bulkFetch, boolean multiprobe) {
if (bulkFetch)
return "getBulkTableScanResultSet";
else if (multiprobe)
return "getMultiProbeTableScanResultSet";
else
return "getTableScanResultSet";
}
/** @see JoinStrategy#joinResultSetMethodName */
public String joinResultSetMethodName() {
return "getNestedLoopJoinResultSet";
}
/** @see JoinStrategy#halfOuterJoinResultSetMethodName */
public String halfOuterJoinResultSetMethodName() {
return "getNestedLoopLeftOuterJoinResultSet";
}
/**
* @see JoinStrategy#getScanArgs
*
* @exception StandardException Thrown on error
*/
public int getScanArgs(
TransactionController tc,
MethodBuilder mb,
Optimizable innerTable,
OptimizablePredicateList storeRestrictionList,
OptimizablePredicateList nonStoreRestrictionList,
ExpressionClassBuilderInterface acbi,
int bulkFetch,
MethodBuilder resultRowAllocator,
int colRefItem,
int indexColItem,
int lockMode,
boolean tableLocked,
int isolationLevel,
int maxMemoryPerTable,
boolean genInListVals
)
throws StandardException {
ExpressionClassBuilder acb = (ExpressionClassBuilder) acbi;
int numArgs;
if (SanityManager.DEBUG) {
if (nonStoreRestrictionList.size() != 0) {
SanityManager.THROWASSERT(
"nonStoreRestrictionList should be empty for " +
"nested loop join strategy, but it contains " +
nonStoreRestrictionList.size() +
" elements");
}
}
/* If we're going to generate a list of IN-values for index probing
* at execution time then we push TableScanResultSet arguments plus
* two additional arguments: 1) the list of IN-list values, and 2)
* a boolean indicating whether or not the IN-list values are already
* sorted.
*/
if (genInListVals)
{
numArgs = 26;
}
else if (bulkFetch > 1)
{
numArgs = 25;
}
else
{
numArgs = 24 ;
}
fillInScanArgs1(tc, mb,
innerTable,
storeRestrictionList,
acb,
resultRowAllocator);
if (genInListVals)
((PredicateList)storeRestrictionList).generateInListValues(acb, mb);
if (SanityManager.DEBUG)
{
/* If we're not generating IN-list values with which to probe
* the table then storeRestrictionList should not have any
* IN-list probing predicates. Make sure that's the case.
*/
if (!genInListVals)
{
Predicate pred = null;
for (int i = storeRestrictionList.size() - 1; i >= 0; i--)
{
pred = (Predicate)storeRestrictionList.getOptPredicate(i);
if (pred.isInListProbePredicate())
{
SanityManager.THROWASSERT("Found IN-list probing " +
"predicate (" + pred.binaryRelOpColRefsToString() +
") when no such predicates were expected.");
}
}
}
}
fillInScanArgs2(mb,
innerTable,
bulkFetch,
colRefItem,
indexColItem,
lockMode,
tableLocked,
isolationLevel);
return numArgs;
}
/**
* @see JoinStrategy#divideUpPredicateLists
*
* @exception StandardException Thrown on error
*/
public void divideUpPredicateLists(
Optimizable innerTable,
OptimizablePredicateList originalRestrictionList,
OptimizablePredicateList storeRestrictionList,
OptimizablePredicateList nonStoreRestrictionList,
OptimizablePredicateList requalificationRestrictionList,
DataDictionary dd
) throws StandardException
{
/*
** All predicates are store predicates. No requalification is
** necessary for non-covering index scans.
*/
originalRestrictionList.setPredicatesAndProperties(storeRestrictionList);
}
/**
* @see JoinStrategy#doesMaterialization
*/
public boolean doesMaterialization()
{
return false;
}
public String toString() {
return getName();
}
/**
* Can this join strategy be used on the
* outermost table of a join.
*
* @return Whether or not this join strategy
* can be used on the outermose table of a join.
*/
protected boolean validForOutermostTable()
{
return true;
}
}
The table below shows all metrics for NestedLoopJoinStrategy.java.
| Metric | Value | Description | |
|---|---|---|---|
| BLOCKS | 32.00 | Number of blocks | |
| BLOCK_COMMENT | 52.00 | Number of block comment lines | |
| COMMENTS | 95.00 | Comment lines | |
| COMMENT_DENSITY | 0.62 | Comment density | |
| COMPARISONS | 14.00 | Number of comparison operators | |
| CYCLOMATIC | 35.00 | Cyclomatic complexity | |
| DECL_COMMENTS | 17.00 | Comments in declarations | |
| DOC_COMMENT | 43.00 | Number of javadoc comment lines | |
| ELOC | 154.00 | Effective lines of code | |
| EXEC_COMMENTS | 5.00 | Comments in executable code | |
| EXITS | 23.00 | Procedure exits | |
| FUNCTIONS | 18.00 | Number of function declarations | |
| HALSTEAD_DIFFICULTY | 42.69 | Halstead difficulty | |
| HALSTEAD_EFFORT | 0.00 | Halstead effort | |
| INTERFACE_COMPLEXITY | 72.00 | 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 | 4.00 | 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 | 1.00 | 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 | 0.00 | 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 | 0.00 | 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 | 0.00 | 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 | 0.00 | JAVA0105 Duplicate import declaration | |
| JAVA0106 | 1.00 | JAVA0106 Unnecessary import from current package | |
| JAVA0108 | 0.00 | JAVA0108 Incorrect javadoc: no @param tag for 'parameter' | |
| JAVA0109 | 0.00 | JAVA0109 Incorrect javadoc: no parameter 'parameter' | |
| JAVA0110 | 12.00 | 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 | 0.00 | JAVA0113 Incorrect javadoc: no @author tag | |
| JAVA0114 | 0.00 | JAVA0114 Incorrect javadoc: no @version tag | |
| JAVA0115 | 0.00 | JAVA0115 Incorrect javadoc: no @throws or @exception tag for 'exception' | |
| JAVA0116 | 0.00 | JAVA0116 Missing javadoc: field 'field' | |
| JAVA0117 | 1.00 | JAVA0117 Missing javadoc: method 'method' | |
| JAVA0118 | 1.00 | 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 | 0.00 | 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 | 0.00 | JAVA0137 Non-abstract class missing constructor | |
| JAVA0138 | 3.00 | 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 | 794.00 | 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 | 0.00 | 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 | 0.00 | 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 | 1.00 | 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 | 1.00 | 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 | 335.00 | Number of lines in the source file | |
| LINE_COMMENT | 0.00 | Number of line comments | |
| LOC | 202.00 | Lines of code | |
| LOGICAL_LINES | 59.00 | Number of statements | |
| LOOPS | 2.00 | Number of loops | |
| NEST_DEPTH | 5.00 | Maximum nesting depth | |
| OPERANDS | 361.00 | Number of operands | |
| OPERATORS | 585.00 | Number of operators | |
| PARAMS | 42.00 | Number of formal parameter declarations | |
| PROGRAM_LENGTH | 946.00 | Halstead program length | |
| PROGRAM_VOCAB | 183.00 | Halstead program vocabulary | |
| PROGRAM_VOLUME | 0.00 | Halstead program volume | |
| RETURNS | 30.00 | Number of return points from functions | |
| SIZE | 9632.00 | Size of the file in bytes | |
| UNIQUE_OPERANDS | 148.00 | Number of unique operands | |
| UNIQUE_OPERATORS | 35.00 | Number of unique operators | |
| WHITESPACE | 38.00 | Number of whitespace lines | |