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Groovy: A powerful multi-faceted language for the JVM
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
*/
package groovy.util;
import groovy.lang.Closure;
import groovy.lang.DelegatingMetaClass;
import groovy.lang.GroovyRuntimeException;
import groovy.lang.GroovySystem;
import groovy.lang.MetaClass;
import groovy.namespace.QName;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
/**
* A List implementation which is returned by queries on a {@link Node}
* which provides some XPath like helper methods for GPath.
*/
public class NodeList extends ArrayList {
private static final long serialVersionUID = 8307095805417308716L;
static {
// wrap the standard MetaClass with the delegate
setMetaClass(NodeList.class, GroovySystem.getMetaClassRegistry().getMetaClass(NodeList.class));
}
public NodeList() {
}
public NodeList(Collection collection) {
super(collection);
}
public NodeList(int size) {
super(size);
}
/**
* Creates a new NodeList containing the same elements as the
* original (but cloned in the case of Nodes).
*
* @return the clone
*/
@Override
public Object clone() {
NodeList result = new NodeList(size());
for (int i = 0; i < size(); i++) {
Object next = get(i);
if (next instanceof Node) {
Node n = (Node) next;
result.add(n.clone());
} else {
result.add(next);
}
}
return result;
}
protected static void setMetaClass(final Class nodelistClass, final MetaClass metaClass) {
final MetaClass newMetaClass = new DelegatingMetaClass(metaClass) {
@Override
public Object getAttribute(final Object object, final String attribute) {
NodeList nl = (NodeList) object;
Iterator it = nl.iterator();
List result = new ArrayList();
while (it.hasNext()) {
Node node = (Node) it.next();
result.add(node.attributes().get(attribute));
}
return result;
}
@Override
public void setAttribute(final Object object, final String attribute, final Object newValue) {
for (Object o : (NodeList) object) {
Node node = (Node) o;
node.attributes().put(attribute, newValue);
}
}
@Override
public Object getProperty(Object object, String property) {
if (object instanceof NodeList) {
NodeList nl = (NodeList) object;
return nl.getAt(property);
}
return super.getProperty(object, property);
}
};
GroovySystem.getMetaClassRegistry().setMetaClass(nodelistClass, newMetaClass);
}
/**
* Provides lookup of elements by non-namespaced name.
*
* @param name the name or shortcut key for nodes of interest
* @return the nodes of interest which match name
*/
public NodeList getAt(String name) {
NodeList answer = new NodeList();
for (Object child : this) {
if (child instanceof Node) {
Node childNode = (Node) child;
Object temp = childNode.get(name);
if (temp instanceof Collection) {
answer.addAll((Collection) temp);
} else {
answer.add(temp);
}
}
}
return answer;
}
/**
* Provides lookup of elements by QName.
*
* @param name the name or shortcut key for nodes of interest
* @return the nodes of interest which match name
*/
public NodeList getAt(QName name) {
NodeList answer = new NodeList();
for (Object child : this) {
if (child instanceof Node) {
Node childNode = (Node) child;
NodeList temp = childNode.getAt(name);
answer.addAll(temp);
}
}
return answer;
}
/**
* Returns the text value of all of the elements in the collection.
*
* @return the text value of all the elements in the collection or null
*/
public String text() {
String previousText = null;
StringBuilder buffer = null;
for (Object child : this) {
String text = null;
if (child instanceof String) {
text = (String) child;
} else if (child instanceof Node) {
text = ((Node) child).text();
}
if (text != null) {
if (previousText == null) {
previousText = text;
} else {
if (buffer == null) {
buffer = new StringBuilder();
buffer.append(previousText);
}
buffer.append(text);
}
}
}
if (buffer != null) {
return buffer.toString();
}
if (previousText != null) {
return previousText;
}
return "";
}
public Node replaceNode(Closure c) {
if (size() != 1) {
throw new GroovyRuntimeException(
"replaceNode() can only be used to replace a single node, but was applied to " + size() + " nodes");
}
return ((Node)get(0)).replaceNode(c);
}
public void plus(Closure c) {
for (Object o : this) {
((Node) o).plus(c);
}
}
}