org.apache.jdo.impl.jdoql.tree
Class BinaryExpr

java.lang.Object
  antlr.BaseAST
      antlr.CommonAST
          org.apache.jdo.impl.jdoql.jdoqlc.JDOQLAST
              org.apache.jdo.impl.jdoql.tree.NodeImpl
                  org.apache.jdo.impl.jdoql.tree.Expr
                      org.apache.jdo.impl.jdoql.tree.BinaryExpr

All Implemented Interfaces:

antlr.collections.AST, BinaryExpression, java.lang.Cloneable, Expression, Node, java.io.Serializable

Direct Known Subclasses:

AndExpr, ConditionalAndExpr, ConditionalOrExpr, DivideExpr, EqualsExpr, GreaterThanEqualsExpr, GreaterThanExpr, LessThanEqualsExpr, LessThanExpr, MinusExpr, NotEqualsExpr, OrExpr, PlusExpr, TimesExpr

public abstract class BinaryExpr

extends Expr

implements BinaryExpression

This node represents a binary operator. All binary operators have exactly two children. Examples of binary operators are AndExpression and EqualsExpression.

Author:

Michael Watzek

See Also:

Serialized Form

Field Summary

(package private) java.lang.Class	commonOperandType
(package private) java.lang.String	commonOperandTypeName

Fields inherited from class org.apache.jdo.impl.jdoql.tree.NodeImpl

children, clazz, msg, object, parent

Fields inherited from class org.apache.jdo.impl.jdoql.jdoqlc.JDOQLAST

column, line, typeInfo

Fields inherited from class antlr.CommonAST

Fields inherited from class antlr.BaseAST

down, right

Constructor Summary

	BinaryExpr() The noarg constructor is needed for ANTLR support and deserialization.
(package private)	BinaryExpr(int tokenType, java.lang.String tokenName, java.lang.Class clazz, Expression left, Expression right) This constructor is called by specialized nodes.

Method Summary

(package private) java.lang.Class	computeJavaClass(java.lang.Class left, java.lang.Class right)
java.lang.Class	getCommonOperandType() Returns the class instance suiteable for implementing the result of this expression.
Expression	getLeftExpression() Returns the first child of this node.
Expression	getRightExpression() Returns the second child of this node.
void	setCommonOperandType(java.lang.Class clazz) Sets the common operand type for this binary expression.

Methods inherited from class org.apache.jdo.impl.jdoql.tree.NodeImpl

arrive, ASTToChildren, clone, getChildren, getJavaClass, getObject, getParent, getTokenType, leave, setChildren, setObject, setParent, toString, walkNextChild

Methods inherited from class org.apache.jdo.impl.jdoql.jdoqlc.JDOQLAST

getColumn, getLine, getTypeInfo, initialize, initialize, initialize, setColumn, setLine, setTypeInfo, treeToString

Methods inherited from class antlr.CommonAST

getText, getType, initialize, setText, setType

Methods inherited from class antlr.BaseAST

addChild, decode, encode, equals, equalsList, equalsListPartial, equalsTree, equalsTreePartial, findAll, findAllPartial, getFirstChild, getNextSibling, getNumberOfChildren, getTokenNames, removeChildren, setFirstChild, setNextSibling, setVerboseStringConversion, toStringList, toStringTree, xmlSerialize, xmlSerializeNode, xmlSerializeRootClose, xmlSerializeRootOpen

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.apache.jdo.jdoql.tree.Node

arrive, getChildren, getJavaClass, getObject, getParent, getTokenType, leave, setObject, setParent, walkNextChild

Field Detail

commonOperandType

transient java.lang.Class commonOperandType

commonOperandTypeName

java.lang.String commonOperandTypeName

Constructor Detail

BinaryExpr

public BinaryExpr()

The noarg constructor is needed for ANTLR support and deserialization. The caller must make sure to set the ANTLR tree structure himself or, call setChildren optionally.

BinaryExpr

BinaryExpr(int tokenType,
           java.lang.String tokenName,
           java.lang.Class clazz,
           Expression left,
           Expression right)

This constructor is called by specialized nodes. It calls setChildren in order to initialize the node's children left and right.

Parameters:

tokenType - the token type

tokenName - the name of this node

clazz - the Java type of this node

left - the first child

right - the second child

Method Detail

getLeftExpression

public Expression getLeftExpression()

Returns the first child of this node.

Specified by:

getLeftExpression in interface BinaryExpression

Returns:

the first child

getRightExpression

public Expression getRightExpression()

Returns the second child of this node.

Specified by:

getRightExpression in interface BinaryExpression

Returns:

the second child

getCommonOperandType

public java.lang.Class getCommonOperandType()

Returns the class instance suiteable for implementing the result of this expression. In case of integral binary expressions that class instance is also the result type of the operation retrieved by method getJavaClass. In case of relational binary expressions, that class instance differs from the type retrieved by getJavaClass, because relational binary expressions have a boolean result type which does not depend of the operand types.

Specified by:

getCommonOperandType in interface BinaryExpression

Returns:

the common operand type

setCommonOperandType

public void setCommonOperandType(java.lang.Class clazz)

Sets the common operand type for this binary expression.

Parameters:

clazz - the common operand type

computeJavaClass

java.lang.Class computeJavaClass(java.lang.Class left,
                                 java.lang.Class right)