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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.CoreOperationRelationalExpression
public abstract class CoreOperationRelationalExpression
Base implementation of Expression for the operations ">", ">=", "<", "<=".
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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protected |
CoreOperationRelationalExpression(Expression[] args)
Create a new CoreOperationRelationalExpression. |
Method Summary | |
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private boolean |
compute(java.lang.Object left,
java.lang.Object right)
Compare left to right. |
java.lang.Object |
computeValue(EvalContext context)
Evaluates the expression. |
private boolean |
containsMatch(java.util.Iterator it,
java.lang.Object value)
Learn whether any element returned from an Iterator matches a given value. |
protected abstract boolean |
evaluateCompare(int compare)
Template method for subclasses to evaluate the result of a comparison. |
private boolean |
findMatch(java.util.Iterator lit,
java.util.Iterator rit)
Learn whether there is an intersection between two Iterators. |
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. |
private java.lang.Object |
reduce(java.lang.Object o)
Reduce an operand for comparison. |
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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protected CoreOperationRelationalExpression(Expression[] args)
args
- argumentsMethod Detail |
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public final java.lang.Object computeValue(EvalContext context)
Expression
computeValue
in class CoreOperation
context
- evaluation context
protected final int getPrecedence()
CoreOperation
getPrecedence
in class CoreOperation
protected final boolean isSymmetric()
CoreOperation
isSymmetric
in class CoreOperation
protected abstract boolean evaluateCompare(int compare)
compare
- result of comparison to evaluate
private boolean compute(java.lang.Object left, java.lang.Object right)
left
- left operandright
- right operand
private java.lang.Object reduce(java.lang.Object o)
o
- Object to reduce
private boolean containsMatch(java.util.Iterator it, java.lang.Object value)
it
- Iteratorvalue
- to look for
private boolean findMatch(java.util.Iterator lit, java.util.Iterator rit)
lit
- left Iteratorrit
- right Iterator
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