returnType is not one of the types defined in {@link XPathConstants},
* then an <code>IllegalArgumentException is thrown.
*
* <p>If a null value is provided for
* <code>item, an empty document will be used for the
* context.
* If <code>returnType is null, then a NullPointerException is thrown.
*
* @param item The starting context (a node, for example).
* @param returnType The desired return type.
*
* @return The <code>Object that is the result of evaluating the expression and converting the result to
* <code>returnType.
*
* @throws XPathExpressionException If the expression cannot be evaluated.
* @throws IllegalArgumentException If <code>returnType is not one of the types defined in {@link XPathConstants}.
* @throws NullPointerException If <code>returnType is null.
*/
public Object evaluate(Object item, QName returnType)
throws XPathExpressionException;
/**
* <p>Evaluate the compiled XPath expression in the specified context and return the result as a String.
*
* <p>This method calls {@link #evaluate(Object item, QName returnType)} with a returnType of
* {@link XPathConstants#STRING}.</p>
*
* <p>See Evaluation of XPath Expressions for context item evaluation,
* variable, function and QName resolution and return type conversion.</p>
*
* <p>If a null value is provided for
* <code>item, an empty document will be used for the
* context.
*
* @param item The starting context (a node, for example).
*
* @return The <code>String that is the result of evaluating the expression and converting the result to a
* <code>String.
*
* @throws XPathExpressionException If the expression cannot be evaluated.
*/
public String evaluate(Object item)
throws XPathExpressionException;
/**
* <p>Evaluate the compiled XPath expression in the context of the specified InputSource and return the result as the
* specified type.</p>
*
* <p>This method builds a data model for the {@link InputSource} and calls
* {@link #evaluate(Object item, QName returnType)} on the resulting document object.</p>
*
* <p>See Evaluation of XPath Expressions for context item evaluation,
* variable, function and QName resolution and return type conversion.</p>
*
* <p>If returnType is not one of the types defined in {@link XPathConstants},
* then an <code>IllegalArgumentException is thrown.
*
* <p>If source or returnType is null,
* then a <code>NullPointerException is thrown.
*
* @param source The <code>InputSource of the document to evaluate over.
* @param returnType The desired return type.
*
* @return The <code>Object that is the result of evaluating the expression and converting the result to
* <code>returnType.
*
* @throws XPathExpressionException If the expression cannot be evaluated.
* @throws IllegalArgumentException If <code>returnType is not one of the types defined in {@link XPathConstants}.
* @throws NullPointerException If <code>source or returnType is null.
*/
public Object evaluate(InputSource source, QName returnType)
throws XPathExpressionException;
/**
* <p>Evaluate the compiled XPath expression in the context of the specified InputSource and return the result as a
* <code>String.
*
* <p>This method calls {@link #evaluate(InputSource source, QName returnType)} with a returnType of
* {@link XPathConstants#STRING}.</p>
*
* <p>See Evaluation of XPath Expressions for context item evaluation,
* variable, function and QName resolution and return type conversion.</p>
*
* <p>If source is null, then a NullPointerException is thrown.
*
* @param source The <code>InputSource of the document to evaluate over.
*
* @return The <code>String that is the result of evaluating the expression and converting the result to a
* <code>String.
*
* @throws XPathExpressionException If the expression cannot be evaluated.
* @throws NullPointerException If <code>source is null.
*/
public String evaluate(InputSource source)
throws XPathExpressionException;
}
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Java example source code file (XPathExpression.java)
The XPathExpression.java Java example source code/*
* Copyright (c) 2003, 2005, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package javax.xml.xpath;
import org.xml.sax.InputSource;
import javax.xml.namespace.QName;
/**
* <p> |
