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java.lang.Objectorg.apache.commons.jxpath.ri.compiler.Expression
org.apache.commons.jxpath.ri.compiler.Operation
org.apache.commons.jxpath.ri.compiler.CoreOperation
org.apache.commons.jxpath.ri.compiler.CoreOperationCompare
public abstract class CoreOperationCompare
Common superclass for the implementations of Expression for the operations "=" and "!=".
Nested Class Summary |
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Nested classes/interfaces inherited from class org.apache.commons.jxpath.ri.compiler.Expression |
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Expression.PointerIterator, Expression.ValueIterator |
Field Summary |
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Fields inherited from class org.apache.commons.jxpath.ri.compiler.CoreOperation |
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ADD_PRECEDENCE, AND_PRECEDENCE, COMPARE_PRECEDENCE, MULTIPLY_PRECEDENCE, NEGATE_PRECEDENCE, OR_PRECEDENCE, RELATIONAL_EXPR_PRECEDENCE, UNION_PRECEDENCE |
Fields inherited from class org.apache.commons.jxpath.ri.compiler.Operation |
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args |
Fields inherited from class org.apache.commons.jxpath.ri.compiler.Expression |
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NOT_A_NUMBER, ONE, ZERO |
Constructor Summary | |
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CoreOperationCompare(Expression arg1,
Expression arg2)
Create a new CoreOperationCompare. |
protected |
CoreOperationCompare(Expression arg1,
Expression arg2,
boolean invert)
Create a new CoreOperationCompare. |
Method Summary | |
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Object |
computeValue(EvalContext context)
Evaluates the expression. |
protected boolean |
contains(Iterator it,
Object value)
Learn whether it contains value. |
protected boolean |
equal(EvalContext context,
Expression left,
Expression right)
Compares two values. |
protected boolean |
equal(Object l,
Object r)
Learn whether l equals r in XPath terms. |
protected boolean |
findMatch(Iterator lit,
Iterator rit)
Learn whether lit intersects rit. |
protected int |
getPrecedence()
Computes the precedence of the operation. |
protected boolean |
isSymmetric()
Returns true if the operation is not sensitive to the order of arguments, e.g. |
Methods inherited from class org.apache.commons.jxpath.ri.compiler.CoreOperation |
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compute, getSymbol, toString |
Methods inherited from class org.apache.commons.jxpath.ri.compiler.Operation |
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computeContextDependent, getArguments |
Methods inherited from class org.apache.commons.jxpath.ri.compiler.Expression |
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isContextDependent, iterate, iteratePointers |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Constructor Detail |
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public CoreOperationCompare(Expression arg1, Expression arg2)
arg1
- left operandarg2
- right operandprotected CoreOperationCompare(Expression arg1, Expression arg2, boolean invert)
arg1
- left operandarg2
- right operandinvert
- whether to invert (not) the comparisonMethod Detail |
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public Object computeValue(EvalContext context)
Expression
computeValue
in class CoreOperation
context
- evaluation context
protected int getPrecedence()
CoreOperation
getPrecedence
in class CoreOperation
protected boolean isSymmetric()
CoreOperation
isSymmetric
in class CoreOperation
protected boolean equal(EvalContext context, Expression left, Expression right)
context
- evaluation contextleft
- operandright
- operand
protected boolean contains(Iterator it, Object value)
it
- Iterator to checkvalue
- for which to look
protected boolean findMatch(Iterator lit, Iterator rit)
lit
- left Iteratorrit
- right Iterator
protected boolean equal(Object l, Object r)
l
- left operandr
- right operand
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