org.globus.wsrf.impl
Class XPathExpressionEvaluator

java.lang.Object
  org.globus.wsrf.impl.XPathExpressionEvaluator

All Implemented Interfaces:

ExpressionEvaluator

public class XPathExpressionEvaluator
extends java.lang.Object
implements ExpressionEvaluator

Evaluator supporting XPath queries using Xalan-J XPathAPI. The implementation creates resource property document on-fly and runs the query against it.

Field Summary

private static java.lang.String[]	DIALECTS
private static org.globus.util.I18n	i18n
(package private) static org.apache.commons.logging.Log	logger

Constructor Summary

XPathExpressionEvaluator()

Method Summary

java.lang.Object	evaluate(QueryExpressionType expression, ResourcePropertySet resourcePropertySet) Evaluates the expression over a ResourcePropertySet and returns the result.
private java.util.List	evaluateQuery(QueryExpressionType expression, ResourcePropertySet resourcePropertySet)
java.lang.String[]	getDialects() Gets the list of dialects that this evaluator can handle.

Methods inherited from class java.lang.Object

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

Field Detail

logger

static org.apache.commons.logging.Log logger

i18n

private static org.globus.util.I18n i18n

DIALECTS

private static final java.lang.String[] DIALECTS

Constructor Detail

XPathExpressionEvaluator

public XPathExpressionEvaluator()

Method Detail

getDialects

public java.lang.String[] getDialects()

Description copied from interface: ExpressionEvaluator

Gets the list of dialects that this evaluator can handle.

Specified by:

getDialects in interface ExpressionEvaluator

Returns:

list of dialects supported by this evaluator.

evaluate

public java.lang.Object evaluate(QueryExpressionType expression,
                                 ResourcePropertySet resourcePropertySet)
                          throws UnsupportedQueryDialectException,
                                 QueryEvaluationException,
                                 InvalidQueryExpressionException,
                                 QueryException

Description copied from interface: ExpressionEvaluator

Evaluates the expression over a ResourcePropertySet and returns the result.

Specified by:

evaluate in interface ExpressionEvaluator

Parameters:

expression - object passed by client representing query expression.

resourcePropertySet - ResourcePropertySet associated with resource. The expression is evaluated against this set.

Returns:

the result of the evaluation which depends on the expression. The results must be an xml serializable object in order to be passed back correctly to a remote client. The easiest way of achieving this is to model it as a Bean, or simply return a SOAPElment or DOM Element. If the result object returned is null an empty query result is returned.

Throws:

UnsupportedQueryDialectException - if query dialect is unsupported.

QueryEvaluationException - if query evaluation fails.

InvalidQueryExpressionException - if query expression is invalid.

QueryException - if any other error

evaluateQuery

private java.util.List evaluateQuery(QueryExpressionType expression,
                                     ResourcePropertySet resourcePropertySet)
                              throws java.lang.Exception

Throws:

java.lang.Exception