Java Doc for Expression.java in  » Library » Apache-commons-jxpath-1.2-src » org » apache » commons » jxpath » ri » compiler » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Library » Apache commons jxpath 1.2 src » org.apache.commons.jxpath.ri.compiler 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   org.apache.commons.jxpath.ri.compiler.Expression

All known Subclasses:   org.apache.commons.jxpath.ri.compiler.VariableReference,  org.apache.commons.jxpath.ri.compiler.Operation,  org.apache.commons.jxpath.ri.compiler.Path,  org.apache.commons.jxpath.ri.compiler.Constant,
Expression
abstract public class Expression (Code)
Common superclass for several types of nodes in the parse tree. Provides APIs for optimization of evaluation of expressions. Specifically, an expression only needs to executed once during the evaluation of an xpath if that expression is context-independent. Expression.isContextDependent() provides that hint.
author:
   Dmitri Plotnikov
version:
   $Revision: 1.10 $ $Date: 2004/02/29 14:17:38 $

Inner Class :public static class PointerIterator implements Iterator
Inner Class :public static class ValueIterator implements Iterator

Field Summary
final protected static  DoubleNOT_A_NUMBER
    
final protected static  DoubleONE
    
final protected static  DoubleZERO
    


Method Summary
abstract public  Objectcompute(EvalContext context)
    
abstract public  booleancomputeContextDependent()
    
abstract public  ObjectcomputeValue(EvalContext context)
     Evaluates the expression.
public  booleanisContextDependent()
     Returns true if this expression should be re-evaluated each time the current position in the context changes.
public  Iteratoriterate(EvalContext context)
    
public  IteratoriteratePointers(EvalContext context)
    

Field Detail
NOT_A_NUMBER
final protected static Double NOT_A_NUMBER(Code)



ONE
final protected static Double ONE(Code)



ZERO
final protected static Double ZERO(Code)





Method Detail
compute
abstract public Object compute(EvalContext context)(Code)



computeContextDependent
abstract public boolean computeContextDependent()(Code)
Implemented by subclasses and result is cached by isContextDependent()



computeValue
abstract public Object computeValue(EvalContext context)(Code)
Evaluates the expression. If the result is a node set, returns the first element of the node set.



isContextDependent
public boolean isContextDependent()(Code)
Returns true if this expression should be re-evaluated each time the current position in the context changes.



iterate
public Iterator iterate(EvalContext context)(Code)



iteratePointers
public Iterator iteratePointers(EvalContext context)(Code)



Methods inherited from java.lang.Object
native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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