Java XPath Evaluate evaluateXPath(String path, Node e, QName type)

Description

evaluate X Path

License

Apache License

Declaration

private static Object evaluateXPath(String path, Node e, QName type) 

Method Source Code

//package com.java2s;
/*//from   w w w.  j av  a 2 s .c o  m
 * Copyright 2012 LIG SIGMA
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import org.w3c.dom.Node;

import javax.xml.namespace.QName;

import javax.xml.xpath.*;

import java.util.HashMap;
import java.util.Map;

public class Main {
    private static XPath xpath;
    private static Map<String, XPathExpression> compiledString = new HashMap<String, XPathExpression>();

    private static Object evaluateXPath(String path, Node e, QName type) {
        try {
            XPathExpression expr = compiledString.get(path);
            if (expr == null) {
                expr = xpath.compile(path);
                compiledString.put(path, expr);
            }
            return expr.evaluate(e, type);
        } catch (XPathExpressionException e1) {
            throw new IllegalStateException("Wrong XPATH expression: " + path, e1);
            //SHOULD NEVER HAPPEN IF THE EXPRESSIONS ARE WELL MADE INSIDE THE CODE
        }
    }

    public static String get(String path, Node e) {
        return (String) evaluateXPath(path, e, XPathConstants.STRING);
    }
}

Related

1. evaluateXPath(final String xPath, final Object item, final QName returnType)
2. evaluateXPath(final XPathExpression expr, final Object rootNode, final QName returnType)
3. evaluateXPath(Node node, String xPath)
4. evaluateXpath(String expression, Document document, QName dataType)
5. evaluateXpath(String expression, Object node, QName returnType, NamespaceContext nsContext)
6. evaluateXPath(String xpath, Object item, QName returnType)
7. evaluateXPathAsNodeList(String expression, Document document)
8. evaluateXPathBool(final Node inNode, final String xpath)
9. evaluateXPathExpr(final File xmlFile, final XPathExpression xPathExpression, final QName returnType)