ExpressionClassBuilder.java

Index Score
org.apache.derby.impl.sql.compile
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.

MetricDescription
LINE_COMMENTNumber of line comments
DECL_COMMENTSComments in declarations
COMMENTSComment lines
JAVA0108JAVA0108 Incorrect javadoc: no @param tag for 'parameter'
DOC_COMMENTNumber of javadoc comment lines
EXEC_COMMENTSComments in executable code
SIZESize of the file in bytes
LINESNumber of lines in the source file
JAVA0130JAVA0130 Non-static method does not use instance fields
JAVA0110JAVA0110 Incorrect javadoc: no @return tag
PARAMSNumber of formal parameter declarations
EXITSProcedure exits
FUNCTIONSNumber of function declarations
JAVA0080JAVA0080 Import declaration not used
INTERFACE_COMPLEXITYInterface complexity
UNIQUE_OPERANDSNumber of unique operands
JAVA0285JAVA0285 Dereference of potentially null variable
PROGRAM_VOCABHalstead program vocabulary
OPERANDSNumber of operands
JAVA0177JAVA0177 Variable declaration missing initializer
WHITESPACENumber of whitespace lines
JAVA0106JAVA0106 Unnecessary import from current package
LOGICAL_LINESNumber of statements
JAVA0034JAVA0034 Missing braces in if statement
RETURNSNumber of return points from functions
PROGRAM_LENGTHHalstead program length
LOCLines of code
ELOCEffective lines of code
OPERATORSNumber of operators
PROGRAM_VOLUMEHalstead program volume
JAVA0136JAVA0136 N methods defined in class (maximum: M)
JAVA0160JAVA0160 Method does not throw specified exception
JAVA0126JAVA0126 Method declares unchecked exception in throws
JAVA0117JAVA0117 Missing javadoc: method 'method'
JAVA0145JAVA0145 Tab character used in source file
JAVA0100JAVA0100 Class contains N non-final fields (maximum: M)
JAVA0068JAVA0068 Modifiers not declared in recommended order
/* Derby - Class org.apache.derby.impl.sql.compile.ExpressionClassBuilder 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.ClassBuilder; import org.apache.derby.iapi.services.compiler.MethodBuilder; import org.apache.derby.iapi.services.compiler.JavaFactory; import org.apache.derby.iapi.services.compiler.LocalField; import org.apache.derby.iapi.reference.ClassName; import org.apache.derby.iapi.services.sanity.SanityManager; import org.apache.derby.iapi.sql.compile.CompilerContext; import org.apache.derby.iapi.sql.compile.ExpressionClassBuilderInterface; import org.apache.derby.iapi.sql.execute.ResultSetFactory; import org.apache.derby.iapi.sql.execute.ExecutionFactory; import org.apache.derby.iapi.sql.execute.ExecIndexRow; import org.apache.derby.iapi.sql.Activation; import org.apache.derby.iapi.sql.ParameterValueSet; import org.apache.derby.iapi.sql.Row; import org.apache.derby.iapi.sql.execute.ExecRow; import org.apache.derby.impl.sql.compile.OrderedColumnList; import org.apache.derby.impl.sql.compile.ResultColumnList; import org.apache.derby.impl.sql.execute.IndexColumnOrder; import org.apache.derby.iapi.store.access.ColumnOrdering; import org.apache.derby.iapi.types.DataValueDescriptor; import org.apache.derby.iapi.types.DataTypeDescriptor; import org.apache.derby.iapi.types.DataValueFactory; import org.apache.derby.iapi.types.TypeId; import org.apache.derby.iapi.sql.compile.TypeCompiler; import org.apache.derby.iapi.error.StandardException; import org.apache.derby.iapi.util.ByteArray; import org.apache.derby.iapi.services.loader.ClassFactory; import org.apache.derby.iapi.services.loader.GeneratedClass; import org.apache.derby.iapi.services.loader.GeneratedByteCode; import org.apache.derby.iapi.services.loader.GeneratedMethod; import java.lang.reflect.Modifier; import org.apache.derby.iapi.services.classfile.VMOpcode; import org.apache.derby.iapi.services.monitor.Monitor; import org.apache.derby.iapi.services.io.FormatableArrayHolder; import java.io.Serializable; /** * ExpressionClassBuilder * provides an interface to satisfy generation's * common tasks in building classes that involve expressions. * This is the common superclass of ActivationClassBuilder and * FilterClassBuilder. See the documentation on ActivationClassBuilder. * */ abstract class ExpressionClassBuilder implements ExpressionClassBuilderInterface { /////////////////////////////////////////////////////////////////////// // // CONSTANTS // /////////////////////////////////////////////////////////////////////// static final protected String currentDatetimeFieldName = "cdt"; /////////////////////////////////////////////////////////////////////// // // STATE // /////////////////////////////////////////////////////////////////////// protected ClassBuilder cb; protected GeneratedClass gc; protected int nextExprNum; protected int nextNonFastExpr; protected int nextFieldNum; protected MethodBuilder constructor; CompilerContext myCompCtx; MethodBuilder executeMethod; // to find it fast protected LocalField cdtField; //protected final JavaFactory javaFac; private String currentRowScanResultSetName; /////////////////////////////////////////////////////////////////////// // // CONSTRUCTORS // /////////////////////////////////////////////////////////////////////// /** * By the time this is done, it has constructed the following class: * <pre> * public class #className extends #superClass { * public #className() { super(); } * } * </pre> * * @exception StandardException thrown on failure */ ExpressionClassBuilder (String superClass, String className, CompilerContext cc ) throws StandardException { int modifiers = Modifier.PUBLIC | Modifier.FINAL; myCompCtx = cc; JavaFactory javaFac = myCompCtx.getJavaFactory(); if ( className == null ) { className = myCompCtx.getUniqueClassName(); } // start the class cb = javaFac.newClassBuilder(myCompCtx.getClassFactory(), getPackageName(), modifiers, className, superClass); beginConstructor(); } /////////////////////////////////////////////////////////////////////// // // ABSTRACT METHODS TO BE IMPLEMENTED BY CHILDREN // /////////////////////////////////////////////////////////////////////// /** * Get the name of the package that the generated class will live in. * * @return name of package that the generated class will live in. */ abstract String getPackageName(); /** * Get the number of ExecRows that must be allocated * * @return number of ExecRows that must be allocated * * @exception StandardException thrown on failure */ abstract int getRowCount() throws StandardException; /** * Sets the number of subqueries under this expression * * * @exception StandardException thrown on failure */ abstract void setNumSubqueries() throws StandardException; /////////////////////////////////////////////////////////////////////// // // ACCESSORS // /////////////////////////////////////////////////////////////////////// /** Return the base class of the activation's hierarchy (the subclass of Object). This class is expected to hold methods used by all compilation code, such as datatype compilation code, e.g. getDataValueFactory. */ abstract String getBaseClassName(); MethodBuilder getConstructor() { return constructor; } ClassBuilder getClassBuilder() { return cb; } /** * Get the execute method in order to add code to it. * Added code will be executed for each execution * of the activation. StatementNode completes the * execute method so that code added by other nodes * will be executed before the ResultSet is created * using fillResultSet. */ MethodBuilder getExecuteMethod() { return executeMethod; } /////////////////////////////////////////////////////////////////////// // // CONSTRUCTOR MANAGEMENT // /////////////////////////////////////////////////////////////////////// private final void beginConstructor() { // create a constructor that just calls super. MethodBuilder realConstructor = cb.newConstructorBuilder(Modifier.PUBLIC); realConstructor.callSuper(); realConstructor.methodReturn(); realConstructor.complete(); constructor = cb.newMethodBuilder(Modifier.PUBLIC, "void", "postConstructor"); constructor.addThrownException(ClassName.StandardException); } /** * Finish the constructor by newing the array of Rows and putting a return * at the end of it. * * @exception StandardException thrown on failure */ void finishConstructor() throws StandardException { int numResultSets; /* Set the number of subqueries */ setNumSubqueries(); numResultSets = getRowCount(); /* Generate the new of ExecRow[numResultSets] when there are ResultSets * which return Rows. */ if (numResultSets >= 1) { addNewArrayOfRows(numResultSets); } /* Generated code is: * return; */ constructor.methodReturn(); constructor.complete(); } /** * Generate the assignment for row = new ExecRow[numResultSets] * * @param numResultSets The size of the array. */ private void addNewArrayOfRows(int numResultSets) { /* Generated code is: * row = new ExecRow[numResultSets]; */ constructor.pushThis(); constructor.pushNewArray(ClassName.ExecRow, numResultSets); constructor.putField(ClassName.BaseActivation, "row", ClassName.ExecRow + "[]"); constructor.endStatement(); } /////////////////////////////////////////////////////////////////////// // // ADD FIELDS TO GENERATED CLASS // /////////////////////////////////////////////////////////////////////// /** * Add a field declaration to the generated class * * @param modifiers The | of the modifier values such as public, static, etc. * @param type The type of the field in java language. * @param name The name of the field. * * @return None. */ LocalField newFieldDeclaration(int modifiers, String type, String name) { return cb.addField(type, name, modifiers); } /** * Add an arbitrarily named field to the generated class. * * This is used to generate fields where the caller doesn't care what * the field is named. It is especially useful for generating arbitrary * numbers of fields, where the caller doesn't know in advance how many * fields will be used. For example, it is used for generating fields * to hold intermediate values from expressions. * * @param modifiers The | of the modifier values such as public, static, etc. * @param type The type of the field in java language. * * @return The name of the new field */ LocalField newFieldDeclaration(int modifiers, String type) { return cb.addField(type, newFieldName(), modifiers); } /////////////////////////////////////////////////////////////////////// // // ADD FUNCTIONS TO GENERATED CLASS // /////////////////////////////////////////////////////////////////////// /** * Activations might have need of internal functions * that are not used by the result sets, but by other * activation functions. Thus, we make it possible * for functions to be generated directly as well * as through the newExprFun interface. newExprFun * should be used when a static field pointing to the * expression function is needed. * <p> * The generated function will generally have a generated name * that can be viewed through the MethodBuilder interface. * This name is generated to ensure uniqueness from other * function names in the activation class. If you pass in a function * name, think carefully about whether it will collide with other names. * * @param returnType the return type of the function * @param modifiers the modifiers on the function * * @see #newExprFun */ MethodBuilder newGeneratedFun(String returnType, int modifiers) { return newGeneratedFun(returnType, modifiers, (String[]) null); } MethodBuilder newGeneratedFun(String returnType, int modifiers, String[] params) { String exprName = "g".concat(Integer.toString(nextNonFastExpr++)); return newGeneratedFun(exprName, returnType, modifiers, params); } private MethodBuilder newGeneratedFun(String exprName, String returnType, int modifiers, String[] params) { // // create a new method supplying the given modifiers and return Type // Java: #modifiers #returnType #exprName { } // MethodBuilder exprMethod; if (params == null) { exprMethod = cb.newMethodBuilder(modifiers, returnType, exprName); } else { exprMethod = cb.newMethodBuilder(modifiers, returnType, exprName, params); } // // declare it to throw StandardException // Java: #modifiers #returnType #exprName throws StandardException { } // exprMethod.addThrownException(ClassName.StandardException); return exprMethod; } /** * "ExprFun"s are the "expression functions" that * are specific to a given JSQL statement. For example, * an ExprFun is generated to evaluate the where clause * of a select statement and return a boolean result. * <p> * * All methods return by this are expected to be called * via the GeneratedMethod interface. Thus the methods * are public and return java.lang.Object. * <p> * Once the exprfun has been created, the * caller will need to add statements to it, * minimally a return statement. * <p> * ExprFuns return Object types, since they * are invoked through reflection and thus their * return type would get wrapped in an object anyway. * For example: return java.lang.Boolean, not boolean. */ MethodBuilder newExprFun() { // get next generated function String exprName = "e".concat(Integer.toString(nextExprNum++)); return newGeneratedFun(exprName, "java.lang.Object", Modifier.PUBLIC, (String[]) null); } /** Push an expression that is a GeneratedMethod reference to the passed in method. aka. a "function pointer". */ void pushMethodReference(MethodBuilder mb, MethodBuilder exprMethod) { mb.pushThis(); // instance mb.push(exprMethod.getName()); // arg mb.callMethod(VMOpcode.INVOKEINTERFACE, ClassName.GeneratedByteCode, "getMethod", ClassName.GeneratedMethod, 1 ); } /** * Start a user expression. The difference between a normal expression * (returned by newExprFun) * and a user expression is that a user expression catches all exceptions * (because we don't want random exceptions thrown from user methods to * propagate to the rest of the system. * * @return A new MethodBuilder */ MethodBuilder newUserExprFun() { MethodBuilder mb = newExprFun(); mb.addThrownException("java.lang.Exception"); return mb; } /////////////////////////////////////////////////////////////////////// // // CURRENT DATE/TIME SUPPORT // /////////////////////////////////////////////////////////////////////// /** This utility method returns an expression for CURRENT_DATE. Get the expression this way, because the activation needs to generate support information for CURRENT_DATE, that would otherwise be painful to create manually. */ void getCurrentDateExpression(MethodBuilder mb) { // do any needed setup LocalField lf = getCurrentSetup(); // generated Java: // this.cdt.getCurrentDate(); mb.getField(lf); mb.callMethod(VMOpcode.INVOKEVIRTUAL, (String) null, "getCurrentDate", "java.sql.Date", 0); } /** This utility method returns an expression for CURRENT_TIME. Get the expression this way, because the activation needs to generate support information for CURRENT_TIME, that would otherwise be painful to create manually. */ void getCurrentTimeExpression(MethodBuilder mb) { // do any needed setup LocalField lf = getCurrentSetup(); // generated Java: // this.cdt.getCurrentTime(); mb.getField(lf); mb.callMethod(VMOpcode.INVOKEVIRTUAL, (String) null, "getCurrentTime", "java.sql.Time", 0); } /** This utility method generates an expression for CURRENT_TIMESTAMP. Get the expression this way, because the activation needs to generate support information for CURRENT_TIMESTAMP, that would otherwise be painful to create manually. */ void getCurrentTimestampExpression(MethodBuilder mb) { // do any needed setup LocalField lf = getCurrentSetup(); // generated Java: // this.cdt.getCurrentTimestamp(); mb.getField(lf); mb.callMethod(VMOpcode.INVOKEVIRTUAL, (String) null, "getCurrentTimestamp", "java.sql.Timestamp", 0); } /////////////////////////////////////////////////////////////////////// // // COLUMN ORDERING // /////////////////////////////////////////////////////////////////////// /** These utility methods buffers compilation from the IndexColumnOrder class. They create an ordering based on their parameter, stuff that into the prepared statement, and then return the entry # for use in the generated code. We could write another utility method to generate code to turn an entry # back into an object, but so far no-one needs it. WARNING: this is a crafty method that ASSUMES that you want every column in the list ordered, and that every column in the list is the entire actual result colunm. It is only useful for DISTINCT in select. */ FormatableArrayHolder getColumnOrdering(ResultColumnList rclist) { IndexColumnOrder[] ordering; int numCols = (rclist == null) ? 0 : rclist.size(); //skip the columns which are not exclusively part of the insert list //ie columns with default and autoincrement. These columns will not //be part of ordering. int numRealCols = 0; for (int i=0; i<numCols; i++) { if (!(rclist.getResultColumn(i+1).isGeneratedForUnmatchedColumnInInsert())) numRealCols++; } ordering = new IndexColumnOrder[numRealCols]; for (int i=0, j=0; i<numCols; i++) { if (!(rclist.getResultColumn(i+1).isGeneratedForUnmatchedColumnInInsert())) { ordering[j] = new IndexColumnOrder(i); j++; } } return new FormatableArrayHolder(ordering); } /** * Add a column to the existing Ordering list. Takes * a column id and only adds it if it isn't in the list. * * * @return the ColumnOrdering array */ FormatableArrayHolder addColumnToOrdering( FormatableArrayHolder orderingHolder, int columnNum) { /* ** We don't expect a lot of order by columns, so ** linear search. */ ColumnOrdering[] ordering = (ColumnOrdering[])orderingHolder. getArray(ColumnOrdering.class); int length = ordering.length; for (int i = 0; i < length; i++) { if (ordering[i].getColumnId() == columnNum) return orderingHolder; } /* ** Didn't find it. Allocate a bigger array ** and add it to the end */ IndexColumnOrder[] newOrdering = new IndexColumnOrder[length+1]; System.arraycopy(ordering, 0, newOrdering, 0, length); newOrdering[length] = new IndexColumnOrder(columnNum); return new FormatableArrayHolder(newOrdering); } FormatableArrayHolder getColumnOrdering(OrderedColumnList oclist) { int numCols = (oclist == null) ? 0 : oclist.size(); if (numCols == 0) { return new FormatableArrayHolder(new IndexColumnOrder[0]); } return new FormatableArrayHolder(oclist.getColumnOrdering()); } int addItem(Object o) { if (SanityManager.DEBUG) { if ((o != null) && !(o instanceof Serializable)) { SanityManager.THROWASSERT( "o (" + o.getClass().getName() + ") expected to be instanceof java.io.Serializable"); } } return myCompCtx.addSavedObject(o); } /////////////////////////////////////////////////////////////////////// // // Caching resuable Expressions // /////////////////////////////////////////////////////////////////////// /** * Get/reuse the Expression for getting the DataValueFactory */ private Object getDVF; void pushDataValueFactory(MethodBuilder mb) { // generates: // getDataValueFactory() // if (getDVF == null) { getDVF = mb.describeMethod(VMOpcode.INVOKEVIRTUAL, getBaseClassName(), "getDataValueFactory", ClassName.DataValueFactory); } mb.pushThis(); mb.callMethod(getDVF); } /////////////////////////////////////////////////////////////////////// // // RESULT SET SUPPORT // /////////////////////////////////////////////////////////////////////// /** This is a utility method to get a common expression -- "BaseActivation.getResultSetFactory()". <p> BaseActivation gets the factory from the context and caches it for faster retrieval. */ private Object getRSF; void pushGetResultSetFactoryExpression(MethodBuilder mb) { // generated Java: // this.getResultSetFactory() // if (getRSF == null) { getRSF = mb.describeMethod(VMOpcode.INVOKEVIRTUAL, getBaseClassName(), "getResultSetFactory", ClassName.ResultSetFactory); } mb.pushThis(); mb.callMethod(getRSF); } /** This is a utility method to get a common expression -- "BaseActivation.getExecutionFactory()". REVISIT: could the same expression objects be reused within the tree and have the correct java generated each time? <p> BaseActivation gets the factory from the context and caches it for faster retrieval. */ private Object getEF; void pushGetExecutionFactoryExpression(MethodBuilder mb) { if (getEF == null) { getEF = mb.describeMethod(VMOpcode.INVOKEVIRTUAL, getBaseClassName(), "getExecutionFactory", ClassName.ExecutionFactory); } // generated Java: // this.getExecutionFactory() // mb.pushThis(); mb.callMethod(getEF); } /** * Generate a reference to the row array that * all activations use. * * @param eb the expression block * * @return expression */ //private void pushRowArrayReference(MethodBuilder mb) //{ // PUSHCOMPILE - cache // mb.pushThis(); // mb.getField(ClassName.BaseActivation, "row", ClassName.ExecRow + "[]"); //} /** * Generate a reference to a colunm in a result set. * * @param rsNumber the result set number * @param colId the column number */ void pushColumnReference(MethodBuilder mb, int rsNumber, int colId) { mb.pushThis(); mb.push(rsNumber); mb.push(colId); mb.callMethod(VMOpcode.INVOKEVIRTUAL, ClassName.BaseActivation, "getColumnFromRow", ClassName.DataValueDescriptor, 2); //System.out.println("pushColumnReference "); //pushRowArrayReference(mb); //mb.getArrayElement(rsNumber); // instance for getColumn //mb.push(colId); // first arg //mb.callMethod(VMOpcode.INVOKEINTERFACE, ClassName.Row, "getColumn", ClassName.DataValueDescriptor, 1); } /** * Generate a reference to the parameter value * set that all activations use. * */ void pushPVSReference(MethodBuilder mb) { // PUSHCOMPILER-WASCACHED mb.pushThis(); mb.getField(ClassName.BaseActivation, "pvs", ClassName.ParameterValueSet); } /////////////////////////////////////////////////////////////////////// // // CLASS IMPLEMENTATION // /////////////////////////////////////////////////////////////////////// /* The first time a current datetime is needed, create the class level support for it. */ protected LocalField getCurrentSetup() { if (cdtField != null) return cdtField; // generated Java: // 1) the field "cdt" is created: // private CurrentDatetime cdt; cdtField = newFieldDeclaration( Modifier.PRIVATE, ClassName.CurrentDatetime, currentDatetimeFieldName); // 2) the constructor gets a statement to init CurrentDatetime: // cdt = new CurrentDatetime(); constructor.pushNewStart(ClassName.CurrentDatetime); constructor.pushNewComplete(0); constructor.setField(cdtField); return cdtField; } /** * generated the next field name available. * these are of the form 'e#', where # is * incremented each time. * This shares the name space with the expression methods * as Java allows names and fields to have the same name. * This reduces the number of constant pool entries created * for a generated class file. */ private String newFieldName() { return "e".concat(Integer.toString(nextFieldNum++)); } /////////////////////////////////////////////////////////////////////// // // DEBUG // /////////////////////////////////////////////////////////////////////// /////////////////////////////////////////////////////////////////////// // // DATATYPES // /////////////////////////////////////////////////////////////////////// /** * Get the TypeCompiler associated with the given TypeId * * @param typeId The TypeId to get a TypeCompiler for * * @return The corresponding TypeCompiler * */ protected TypeCompiler getTypeCompiler(TypeId typeId) { return myCompCtx.getTypeCompilerFactory().getTypeCompiler(typeId); } /////////////////////////////////////////////////////////////////////// // // GENERATE BYTE CODE // /////////////////////////////////////////////////////////////////////// /** * Take the generated class, and turn it into an * actual class. * <p> This method assumes, does not check, that * the class and its parts are all complete. * * @param savedBytes place to save generated bytes. * if null, it is ignored * @exception StandardException thrown when exception occurs */ GeneratedClass getGeneratedClass(ByteArray savedBytes) throws StandardException { if (gc != null) return gc; if (savedBytes != null) { ByteArray classBytecode = cb.getClassBytecode(); // note: be sure to set the length since // the class builder allocates the byte array // in big chunks savedBytes.setBytes(classBytecode.getArray()); savedBytes.setLength(classBytecode.getLength()); } gc = cb.getGeneratedClass(); return gc; // !! yippee !! here it is... } /** * Get a "this" expression declared as an Activation. * This is the commonly used type of the this expression. * */ void pushThisAsActivation(MethodBuilder mb) { // PUSHCOMPILER - WASCACHED mb.pushThis(); mb.upCast(ClassName.Activation); } /** Generate a Null data value. Nothing is required on the stack, a SQL null data value is pushed. */ void generateNull(MethodBuilder mb, TypeCompiler tc, int collationType) { pushDataValueFactory(mb); mb.pushNull(tc.interfaceName()); tc.generateNull(mb, collationType); } /** Generate a Null data value. The express value is required on the stack and will be popped, a SQL null data value is pushed. */ void generateNullWithExpress(MethodBuilder mb, TypeCompiler tc, int collationType) { pushDataValueFactory(mb); mb.swap(); // need the dvf as the instance mb.cast(tc.interfaceName()); tc.generateNull(mb, collationType); } /** Generate a data value. The value is to be set in the SQL data value is required on the stack and will be popped, a SQL data value is pushed. */ void generateDataValue(MethodBuilder mb, TypeCompiler tc, int collationType, LocalField field) { pushDataValueFactory(mb); mb.swap(); // need the dvf as the instance tc.generateDataValue(mb, collationType, field); } /** *generates a variable name for the rowscanresultset. *This can not be a fixed name because in cases like *cascade delete same activation class will be dealing * more than one RowScanResultSets for dependent tables. */ String newRowLocationScanResultSetName() { currentRowScanResultSetName = newFieldName(); return currentRowScanResultSetName; } // return the Name of ResultSet with the RowLocations to be modified (deleted or updated). String getRowLocationScanResultSetName() { return currentRowScanResultSetName; } }

The table below shows all metrics for ExpressionClassBuilder.java.

MetricValueDescription
BLOCKS52.00Number of blocks
BLOCK_COMMENT42.00Number of block comment lines
COMMENTS449.00Comment lines
COMMENT_DENSITY 1.71Comment density
COMPARISONS22.00Number of comparison operators
CYCLOMATIC58.00Cyclomatic complexity
DECL_COMMENTS55.00Comments in declarations
DOC_COMMENT272.00Number of javadoc comment lines
ELOC262.00Effective lines of code
EXEC_COMMENTS27.00Comments in executable code
EXITS68.00Procedure exits
FUNCTIONS41.00Number of function declarations
HALSTEAD_DIFFICULTY60.27Halstead difficulty
HALSTEAD_EFFORT 0.00Halstead effort
INTERFACE_COMPLEXITY93.00Interface complexity
JAVA0001 0.00JAVA0001 Package name does not contain only lower case letters
JAVA0002 0.00JAVA0002 Package name does not begin with a top level domain name or country code
JAVA0003 0.00JAVA0003 Minimize use of on-demand (.*) imports
JAVA0004 0.00JAVA0004 Unnecessary import from java.lang
JAVA0005 1.00JAVA0005 Imports not in specified order
JAVA0006 0.00JAVA0006 Empty finally block
JAVA0007 0.00JAVA0007 Should not declare public field
JAVA0008 0.00JAVA0008 Empty catch block
JAVA0009 0.00JAVA0009 Protected member in final class
JAVA0010 0.00JAVA0010 Non-instantiable class does not contain a non-private static member
JAVA0011 0.00JAVA0011 Abstract class does not contain an abstract method
JAVA0012 0.00JAVA0012 Non-constructor method with same name as declaring class
JAVA0013 0.00JAVA0013 Non-blank final field is not static
JAVA0014 0.00JAVA0014 Class with only static members has non-private constructor
JAVA0015 0.00JAVA0015 Package class contains public nested type
JAVA0016 0.00JAVA0016 Abstract class contains public constructor
JAVA0017 0.00JAVA0017 Class name does not have required form
JAVA0018 0.00JAVA0018 Method name does not have required form
JAVA0019 0.00JAVA0019 Interface name does not have required form
JAVA0020 0.00JAVA0020 Field name does not have required form
JAVA0021 0.00JAVA0021 Interface method name does not have required form
JAVA0022 0.00JAVA0022 Static final field name does not have required form
JAVA0023 0.00JAVA0023 Empty finalize method
JAVA0024 0.00JAVA0024 Empty class
JAVA0025 0.00JAVA0025 Method override is empty
JAVA0026 0.00JAVA0026 Finalize method with parameters
JAVA0029 0.00JAVA0029 Private method not used
JAVA0030 0.00JAVA0030 Private field not used
JAVA0031 0.00JAVA0031 Case statement not properly closed
JAVA0032 0.00JAVA0032 Switch statement missing default
JAVA0033 0.00JAVA0033 default: not last case in switch statement
JAVA0034 4.00JAVA0034 Missing braces in if statement
JAVA0035 0.00JAVA0035 Missing braces in for statement
JAVA0036 0.00JAVA0036 Missing braces in while statement
JAVA0038 0.00JAVA0038 Non-case label in switch statement
JAVA0039 0.00JAVA0039 Break statement with label
JAVA0040 0.00JAVA0040 Switch statement contains N cases (maximum: M)
JAVA0041 0.00JAVA0041 Nested synchronized block
JAVA0042 0.00JAVA0042 Empty synchronized statement
JAVA0043 0.00JAVA0043 Inner class does not use outer class
JAVA0044 0.00JAVA0044 Serializable class with no instance variables
JAVA0045 0.00JAVA0045 Serializable class with only transient fields
JAVA0046 0.00JAVA0046 Name of class not derived from Exception ends with 'Exception'
JAVA0047 0.00JAVA0047 Serializable class derives from invalid base class
JAVA0048 0.00JAVA0048 Name of class derived from Exception does not end with 'Exception'
JAVA0049 0.00JAVA0049 Nested block at depth N (maximum: M)
JAVA0050 0.00JAVA0050 Class derives from java.lang.Error
JAVA0051 0.00JAVA0051 Class derives from java.lang.RuntimeException
JAVA0052 0.00JAVA0052 Class derives from java.lang.Throwable
JAVA0053 0.00JAVA0053 Unused label
JAVA0054 0.00JAVA0054 Inheritance depth N exceeds maximum M
JAVA0055 0.00JAVA0055 Class should be interface
JAVA0056 0.00JAVA0056 Unnecessary abstract modifier for interface or annotation
JAVA0057 0.00JAVA0057 Unnecessary default constructor
JAVA0058 0.00JAVA0058 Constructor calls super()
JAVA0059 0.00JAVA0059 Method override only calls super()
JAVA0061 0.00JAVA0061 Inaccessible member in anonymous class
JAVA0062 0.00JAVA0062 Public class missing public member or protected constructor
JAVA0063 0.00JAVA0063 Identifier name should not contain '$'
JAVA0064 0.00JAVA0064 N variations of identifier name (maximum: M)
JAVA0065 0.00JAVA0065 Unnecessary final modifier for method in final class
JAVA0066 0.00JAVA0066 Unnecessary modifier for interface nested type
JAVA0067 0.00JAVA0067 Array descriptor on identifier name
JAVA0068 1.00JAVA0068 Modifiers not declared in recommended order
JAVA0071 0.00JAVA0071 Strings compared with ==
JAVA0073 0.00JAVA0073 Integer division in floating-point context
JAVA0074 0.00JAVA0074 Use of Object.notify()
JAVA0075 0.00JAVA0075 Method parameter hides field
JAVA0076 0.00JAVA0076 Use of magic number
JAVA0077 0.00JAVA0077 Private field not used in declaring class
JAVA0078 0.00JAVA0078 Floating point values compared with ==
JAVA0079 0.00JAVA0079 Use of instance to reference static member
JAVA008014.00JAVA0080 Import declaration not used
JAVA0081 0.00JAVA0081 Boolean literal in comparison
JAVA0082 0.00JAVA0082 Unnecessary widening cast
JAVA0083 0.00JAVA0083 Unnecessary instanceof test
JAVA0084 0.00JAVA0084 Should use compound assignment operator
JAVA0085 0.00JAVA0085 Use of sun.* class
JAVA0087 0.00JAVA0087 Use of Thread.sleep()
JAVA0089 0.00JAVA0089 Use of restricted package
JAVA0092 0.00JAVA0092 Use of restricted type
JAVA0093 0.00JAVA0093 Redundant assignment
JAVA0094 0.00JAVA0094 Field hides a superclass field
JAVA0095 0.00JAVA0095 Uninitialized private field
JAVA0096 0.00JAVA0096 Field in nested class hides outer field
JAVA0098 1.00JAVA0098 Minimize use of implicit field initializers
JAVA0100 1.00JAVA0100 Class contains N non-final fields (maximum: M)
JAVA0101 0.00JAVA0101 Unnecessary modifier for field in interface
JAVA0102 0.00JAVA0102 Last statement in finalize() not super.finalize()
JAVA0103 0.00JAVA0103 Explicit call to finalize()
JAVA0104 0.00JAVA0104 finalize() only calls super.finalize()
JAVA0105 0.00JAVA0105 Duplicate import declaration
JAVA0106 2.00JAVA0106 Unnecessary import from current package
JAVA010824.00JAVA0108 Incorrect javadoc: no @param tag for 'parameter'
JAVA0109 0.00JAVA0109 Incorrect javadoc: no parameter 'parameter'
JAVA0110 8.00JAVA0110 Incorrect javadoc: no @return tag
JAVA0111 0.00JAVA0111 Incorrect javadoc: @return tag for void method
JAVA0112 0.00JAVA0112 Incorrect javadoc: no exception 'exception' in throws
JAVA0113 1.00JAVA0113 Incorrect javadoc: no @author tag
JAVA0114 1.00JAVA0114 Incorrect javadoc: no @version tag
JAVA0115 0.00JAVA0115 Incorrect javadoc: no @throws or @exception tag for 'exception'
JAVA0116 0.00JAVA0116 Missing javadoc: field 'field'
JAVA0117 1.00JAVA0117 Missing javadoc: method 'method'
JAVA0118 0.00JAVA0118 Missing javadoc: type 'type'
JAVA0119 0.00JAVA0119 Control variable changed within body of for loop
JAVA0123 0.00JAVA0123 Use all three components of for loop
JAVA0125 0.00JAVA0125 Continue statement with label
JAVA0126 0.00JAVA0126 Method declares unchecked exception in throws
JAVA0128 0.00JAVA0128 Public constructor in non-public class
JAVA0130 7.00JAVA0130 Non-static method does not use instance fields
JAVA0131 0.00JAVA0131 Compatible method does not override base
JAVA0132 0.00JAVA0132 Method overload with compatible signature
JAVA0133 0.00JAVA0133 Non-synchronized method overrides synchronized method
JAVA0135 0.00JAVA0135 Only one of Object.equals and Object.hashCode defined: missing 'method'
JAVA0136 1.00JAVA0136 N methods defined in class (maximum: M)
JAVA0137 0.00JAVA0137 Non-abstract class missing constructor
JAVA0138 0.00JAVA0138 N parameters defined for method (maximum: M)
JAVA0139 0.00JAVA0139 Definition of main other than public static void main(java.lang.String[])
JAVA0141 0.00JAVA0141 Unnecessary modifier for method in interface
JAVA0143 0.00JAVA0143 Synchronized method
JAVA0144 0.00JAVA0144 Line exceeds maximum M characters
JAVA01451243.00JAVA0145 Tab character used in source file
JAVA0150 0.00JAVA0150 java.lang.Error (or subclass) thrown
JAVA0153 0.00JAVA0153 Inefficient conversion of integer to string
JAVA0159 0.00JAVA0159 Inefficient conversion of string to integer
JAVA0160 1.00JAVA0160 Method does not throw specified exception
JAVA0161 0.00JAVA0161 Conditional wait() not in loop
JAVA0163 0.00JAVA0163 Empty statement
JAVA0165 0.00JAVA0165 Conflicting return statement in finally block
JAVA0166 0.00JAVA0166 Generic exception caught
JAVA0167 0.00JAVA0167 ThreadDeath not rethrown
JAVA0169 0.00JAVA0169 Unnecessary catch block: exception 'exception'
JAVA0170 0.00JAVA0170 Caught exception not derived from java.lang.Exception
JAVA0171 0.00JAVA0171 Unused local variable
JAVA0173 0.00JAVA0173 Unused method parameter
JAVA0174 0.00JAVA0174 Assigned local variable never used
JAVA0175 0.00JAVA0175 Successive assignment to variable
JAVA0176 0.00JAVA0176 Local variable name does not have required form
JAVA0177 3.00JAVA0177 Variable declaration missing initializer
JAVA0179 0.00JAVA0179 Local variable hides visible field
JAVA0233 0.00JAVA0233 Definition of serialVersionUID other than 'private static final long serialVersionUID'
JAVA0234 0.00JAVA0234 Class is Serializable but does not define serialVersionUID
JAVA0235 0.00JAVA0235 Class defines serialVersionUID but does not implement Serializable
JAVA0236 0.00JAVA0236 Attempt to clone an object which does not implement Cloneable
JAVA0237 0.00JAVA0237 Class implements Cloneable but does not have public clone method
JAVA0238 0.00JAVA0238 Clone method does not call super.clone()
JAVA0239 0.00JAVA0239 Class declares 'readObject' or 'writeObject' but does not implement Serializable
JAVA0240 0.00JAVA0240 Serializable class which declares readObject or writeObject but not both
JAVA0241 0.00JAVA0241 'readObject' or 'writeObject' should be declared private in Serializable class
JAVA0242 0.00JAVA0242 Transient field in non-Serializable class
JAVA0243 0.00JAVA0243 'readResolve' or 'writeReplace' should be declared private or protected
JAVA0244 0.00JAVA0244 Field or method name in subclass differs only by case from inherited field or method
JAVA0245 0.00JAVA0245 JUnit TestCase with non-trivial constructor
JAVA0246 0.00JAVA0246 JUnit assertXXX statement missing message parameter
JAVA0247 0.00JAVA0247 JUnit 'setUp()' and 'tearDown()' should call super method
JAVA0248 0.00JAVA0248 JUnit method 'setUp' or 'tearDown' with incorrect signature
JAVA0249 0.00JAVA0249 JUnit TestCase 'suite()' should be declared static
JAVA0250 0.00JAVA0250 JUnit TestCase declares testXXX method with incorrect signature
JAVA0251 0.00JAVA0251 Use '%n' for line breaks in printf/format for platform independence
JAVA0252 0.00JAVA0252 'enum' is a Java 1.5 reserved word
JAVA0253 0.00JAVA0253 Not all enum constants consumed in switch statement
JAVA0254 0.00JAVA0254 Use enhanced for loop construct instead of Iterator
JAVA0255 0.00JAVA0255 Result of method invocation not used
JAVA0256 0.00JAVA0256 Assignment of external collection/array to field
JAVA0257 0.00JAVA0257 Use of 'Constant Interface' anti-pattern
JAVA0258 0.00JAVA0258 Implement Iterable for foreach compatibility
JAVA0259 0.00JAVA0259 Return of collection/array field
JAVA0260 0.00JAVA0260 Use 'enum' instead of Enumerated Type pattern
JAVA0261 0.00JAVA0261 Use specialized Enum collection types
JAVA0262 0.00JAVA0262 Use of char in integer context
JAVA0263 0.00JAVA0263 Long literal ends with 'l' instead of 'L'
JAVA0264 0.00JAVA0264 Integer math in long context - check for overflow
JAVA0265 0.00JAVA0265 Use of Throwable.printStackTrace()
JAVA0266 0.00JAVA0266 Use of System.out
JAVA0267 0.00JAVA0267 Use of System.err
JAVA0269 0.00JAVA0269 Contents of StringBuffer never used
JAVA0270 0.00JAVA0270 Use Java 5.0 enhanced for loop construct to iterate over all elements in an array
JAVA0271 0.00JAVA0271 Minimize use of on-demand (.*) static imports
JAVA0272 0.00JAVA0272 Thread.run() called
JAVA0273 0.00JAVA0273 Non-final derivative of Thread calls start() in constructor
JAVA0274 0.00JAVA0274 Serializable class has a synchronized readObject()
JAVA0275 0.00JAVA0275 Serializable class has a synchronized writeObject() and no other synchronized methods
JAVA0276 0.00JAVA0276 Unnecessary use of String constructor
JAVA0277 0.00JAVA0277 Iterator.next() implementation does not throw NoSuchElementException
JAVA0278 0.00JAVA0278 Unnecessary use of Boolean constructor
JAVA0279 0.00JAVA0279 Serialization method readObject or readObjectNoData calls an overridable method
JAVA0280 0.00JAVA0280 IllegalMonitorStateException caught
JAVA0281 0.00JAVA0281 Iterator.next() not called in loop
JAVA0282 0.00JAVA0282 Call to Iterator.next() in loop which does not test Iterator.hasNext()
JAVA0283 0.00JAVA0283 Control variable not updated in loop body
JAVA0284 0.00JAVA0284 Explicit garbage collection
JAVA0285 3.00JAVA0285 Dereference of potentially null variable
JAVA0286 0.00JAVA0286 Dereference of null variable
JAVA0287 0.00JAVA0287 Unnecessary null check
JAVA0288 0.00JAVA0288 Inconsistent null check
LINES932.00Number of lines in the source file
LINE_COMMENT135.00Number of line comments
LOC343.00Lines of code
LOGICAL_LINES176.00Number of statements
LOOPS 3.00Number of loops
NEST_DEPTH 3.00Maximum nesting depth
OPERANDS886.00Number of operands
OPERATORS1354.00Number of operators
PARAMS48.00Number of formal parameter declarations
PROGRAM_LENGTH2240.00Halstead program length
PROGRAM_VOCAB334.00Halstead program vocabulary
PROGRAM_VOLUME 0.00Halstead program volume
RETURNS45.00Number of return points from functions
SIZE26568.00Size of the file in bytes
UNIQUE_OPERANDS294.00Number of unique operands
UNIQUE_OPERATORS40.00Number of unique operators
WHITESPACE140.00Number of whitespace lines