org.apache.commons.jxpath.ri.compiler
Class CoreOperationRelationalExpression
java.lang.Object
org.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
- Direct Known Subclasses:
- CoreOperationGreaterThan, CoreOperationGreaterThanOrEqual, CoreOperationLessThan, CoreOperationLessThanOrEqual
public abstract class CoreOperationRelationalExpression
- extends CoreOperation
Base implementation of Expression for the operations ">", ">=", "<", "<=".
- Since:
- JXPath 1.3
- Version:
- $Revision: 652845 $ $Date: 2008-05-02 12:46:46 -0500 (Fri, 02 May 2008) $
- Author:
- Matt Benson
Fields inherited from class org.apache.commons.jxpath.ri.compiler.Operation |
args |
Method Summary |
java.lang.Object |
computeValue(EvalContext context)
Evaluates the expression. |
protected abstract boolean |
evaluateCompare(int compare)
Template method for subclasses to evaluate the result of a comparison. |
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 java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
CoreOperationRelationalExpression
protected CoreOperationRelationalExpression(Expression[] args)
- Create a new CoreOperationRelationalExpression.
- Parameters:
args
- arguments
computeValue
public final java.lang.Object computeValue(EvalContext context)
- Description copied from class:
Expression
- Evaluates the expression. If the result is a node set, returns
the first element of the node set.
- Specified by:
computeValue
in class CoreOperation
- Parameters:
context
- evaluation context
- Returns:
- Object
getPrecedence
protected final int getPrecedence()
- Description copied from class:
CoreOperation
- Computes the precedence of the operation.
- Specified by:
getPrecedence
in class CoreOperation
- Returns:
- int precedence
isSymmetric
protected final boolean isSymmetric()
- Description copied from class:
CoreOperation
- Returns true if the operation is not sensitive to the order of arguments,
e.g. "=", "and" etc, and false if it is, e.g. "<=", "div".
- Specified by:
isSymmetric
in class CoreOperation
- Returns:
- boolean
evaluateCompare
protected abstract boolean evaluateCompare(int compare)
- Template method for subclasses to evaluate the result of a comparison.
- Parameters:
compare
- result of comparison to evaluate
- Returns:
- ultimate operation success/failure
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