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/*
* Copyright (C) 2001-2013 Michael Fuchs
*
* This file is part of herold.
*
* herold is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* herold 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 for more details.
*
* You should have received a copy of the GNU General Public License
* along with herold. If not, see <http://www.gnu.org/licenses/>.
*/
package org.dbdoclet.xiphias;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import org.apache.commons.jxpath.CompiledExpression;
import org.apache.commons.jxpath.JXPathContext;
import org.apache.commons.jxpath.JXPathException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.w3c.dom.Node;
public class XPathServices {
private static Log logger = LogFactory.getLog(XPathServices.class);
public static Object getValue(Object contextBean, String query) {
return getValue(contextBean, null, null, query);
}
/**
* Die Methode <code>getValue</code> liefert den Wert eines Kontent.
*
* @param contextBean
* <code>Object</code>
* @param query
* <code>String</code>
* @return <code>Object</code>
*/
public static Object getValue(Object contextBean, String namespace, String namespaceUrl, String query) {
Object obj = null;
JXPathContext context = JXPathContext.newContext(contextBean);
if (namespace != null && namespaceUrl != null) {
context.registerNamespace(namespace, namespaceUrl);
}
CompiledExpression expr = JXPathContext.compile(query);
try {
obj = expr.getValue(context);
} catch (JXPathException oops) {
logger.debug("JXPathException: " + oops.getMessage());
obj = null;
}
return obj;
}
public static ArrayList<String> getValues(Object contextBean, String query) {
return getValues(contextBean, null, null, query);
}
@SuppressWarnings("unchecked")
public static ArrayList<String> getValues(Object contextBean, String namespace, String namespaceUrl, String query) {
Object obj = null;
JXPathContext context = JXPathContext.newContext(contextBean);
if (namespace != null && namespaceUrl != null) {
context.registerNamespace(namespace, namespaceUrl);
}
CompiledExpression expr = JXPathContext.compile(query);
Iterator<Object> iterator;
ArrayList<String> list = new ArrayList<String>();
try {
// Unchecked iterator
iterator = expr.iterate(context);
while (iterator.hasNext()) {
obj = iterator.next();
if (obj != null) {
list.add(obj.toString());
}
}
} catch (JXPathException oops) {
oops.printStackTrace();
}
return list;
}
public static ArrayList<Node> getNodes(Object contextBean, String query) {
return getNodes(contextBean, null, null, query);
}
public static ArrayList<Node> getNodes(Object contextBean, String namespace, String namespaceUrl, String query) {
JXPathContext context = JXPathContext.newContext(contextBean);
if (namespace != null && namespaceUrl != null) {
context.registerNamespace(namespace, namespaceUrl);
}
List<?> list = context.selectNodes(query);
ArrayList<Node> nodeList = new ArrayList<Node>();
for (Object obj : list) {
if (obj instanceof Node) {
nodeList.add((Node) obj);
}
}
return nodeList;
}
public static Node getNode(Object contextBean, String query) {
return getNode(contextBean, null, null, query);
}
public static Node getNode(Object contextBean, String namespace, String namespaceUrl, String query) {
ArrayList<Node> list = getNodes(contextBean, namespace, namespaceUrl, query);
if (list.size() > 0) {
return list.get(0);
} else {
return null;
}
}
}
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