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Groovy: A powerful, dynamic 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.xml.dom;
import groovy.lang.Closure;
import groovy.lang.GroovyRuntimeException;
import groovy.lang.IntRange;
import groovy.xml.DOMBuilder;
import groovy.xml.QName;
import org.codehaus.groovy.runtime.InvokerHelper;
import org.codehaus.groovy.runtime.XmlGroovyMethods;
import org.w3c.dom.Attr;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.w3c.dom.Text;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathExpressionException;
import javax.xml.xpath.XPathFactory;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
/**
* Category class which adds GPath style operations to Java's DOM classes.
*
* @author sam
* @author paulk
*/
public class DOMCategory {
private static boolean trimWhitespace = false;
private static boolean keepIgnorableWhitespace = false;
/**
* @return true if text elements are trimmed before returning; default false
*/
public static synchronized boolean isGlobalTrimWhitespace() {
return trimWhitespace;
}
/**
* Whether text content is trimmed (removing leading and trailing whitespace); default false.
* WARNING: this is a global setting. Altering it will affect all DOMCategory usage within the current Java process.
* It is not recommended that this is altered; instead call the trim() method on the returned text, but the
* flag is available to support legacy Groovy behavior.
*
* @param trimWhitespace the new value
*/
public static synchronized void setGlobalTrimWhitespace(boolean trimWhitespace) {
DOMCategory.trimWhitespace = trimWhitespace;
}
/**
* @return true if ignorable whitespace (e.g. whitespace between elements) is kept; default false
*/
public static synchronized boolean isGlobalKeepIgnorableWhitespace() {
return keepIgnorableWhitespace;
}
/**
* Whether ignorable whitespace (e.g. whitespace between elements) is kept (default false).
* WARNING: this is a global setting. Altering it will affect all DOMCategory usage within the current Java process.
*
* @param keepIgnorableWhitespace the new value
*/
public static synchronized void setGlobalKeepIgnorableWhitespace(boolean keepIgnorableWhitespace) {
DOMCategory.keepIgnorableWhitespace = keepIgnorableWhitespace;
}
public static Object get(Element element, String elementName) {
return xgetAt(element, elementName);
}
public static Object get(NodeList nodeList, String elementName) {
if (nodeList instanceof Element) {
// things like com.sun.org.apache.xerces.internal.dom.DeferredElementNSImpl
// do implement Element, NodeList and Node. But here we prefer element,
// so we force the usage of Element. Without this DOMCategoryTest may fail
// in strange ways
return xgetAt((Element)nodeList, elementName);
} else {
return xgetAt(nodeList, elementName);
}
}
public static Object get(NamedNodeMap nodeMap, String elementName) {
return xgetAt(nodeMap, elementName);
}
private static Object xgetAt(Element element, String elementName) {
if ("..".equals(elementName)) {
return parent(element);
}
if ("**".equals(elementName)) {
return depthFirst(element);
}
if (elementName.startsWith("@")) {
return element.getAttribute(elementName.substring(1));
}
return getChildElements(element, elementName);
}
private static Object xgetAt(NodeList nodeList, String elementName) {
List results = new ArrayList();
for (int i = 0; i < nodeList.getLength(); i++) {
Node node = nodeList.item(i);
if (node instanceof Element) {
addResult(results, get((Element)node, elementName));
}
}
if (elementName.startsWith("@")) {
return results;
}
return new NodeListsHolder(results);
}
public static NamedNodeMap attributes(Element element) {
return element.getAttributes();
}
private static String xgetAt(NamedNodeMap namedNodeMap, String elementName) {
Attr a = (Attr) namedNodeMap.getNamedItem(elementName);
return a.getValue();
}
public static int size(NamedNodeMap namedNodeMap) {
return namedNodeMap.getLength();
}
public static Node getAt(Node o, int i) {
return nodeGetAt(o, i);
}
public static Node getAt(NodeListsHolder o, int i) {
return nodeGetAt(o, i);
}
public static Node getAt(NodesHolder o, int i) {
return nodeGetAt(o, i);
}
public static NodeList getAt(Node o, IntRange r) {
return nodesGetAt(o, r);
}
public static NodeList getAt(NodeListsHolder o, IntRange r) {
return nodesGetAt(o, r);
}
public static NodeList getAt(NodesHolder o, IntRange r) {
return nodesGetAt(o, r);
}
private static Node nodeGetAt(Object o, int i) {
if (o instanceof Element) {
Node n = xgetAt((Element)o, i);
if (n != null) return n;
}
if (o instanceof NodeList) {
return xgetAt((NodeList)o, i);
}
return null;
}
private static NodeList nodesGetAt(Object o, IntRange r) {
if (o instanceof Element) {
NodeList n = xgetAt((Element)o, r);
if (n != null) return n;
}
if (o instanceof NodeList) {
return xgetAt((NodeList)o, r);
}
return null;
}
private static Node xgetAt(Element element, int i) {
if (hasChildElements(element, "*")) {
NodeList nodeList = getChildElements(element, "*");
return xgetAt(nodeList, i);
}
return null;
}
private static Node xgetAt(NodeList nodeList, int i) {
if (i < 0) {
i += nodeList.getLength();
}
if (i >= 0 && i < nodeList.getLength()) {
return nodeList.item(i);
}
return null;
}
private static NodeList xgetAt(Element element, IntRange r) {
if (hasChildElements(element, "*")) {
NodeList nodeList = getChildElements(element, "*");
return xgetAt(nodeList, r);
}
return null;
}
private static NodeList xgetAt(NodeList nodeList, IntRange r) {
int from = r.getFromInt();
int to = r.getToInt();
// If the range is of size 1, then we can use the existing
// xgetAt() that takes an integer index.
if (from == to) return new NodesHolder(Arrays.asList(xgetAt(nodeList, from)));
// Normalise negative indices.
if (from < 0) from = from + nodeList.getLength();
if (to < 0) to = to + nodeList.getLength();
// After normalisation, 'from' may be greater than 'to'. In that
// case, we need to reverse them and make sure the range's 'reverse'
// property is correct.
// TODO We should probably use DefaultGroovyMethodsSupport.subListBorders(),
// but that's protected and unavailable to us.
if (from > to) {
r = r.isReverse() ? new IntRange(to, from) : new IntRange(from, to);
from = r.getFromInt();
to = r.getToInt();
}
// Copy the required nodes into a new list.
List nodes = new ArrayList(to - from + 1);
if (r.isReverse()) {
for (int i = to; i >= from; i--) nodes.add(nodeList.item(i));
}
else {
for (int i = from; i <= to; i++) nodes.add(nodeList.item(i));
}
return new NodesHolder(nodes);
}
public static String name(Node node) {
return node.getNodeName();
}
public static Node parent(Node node) {
return node.getParentNode();
}
public static String text(Node node) {
if (node.getNodeType() == Node.TEXT_NODE || node.getNodeType() == Node.CDATA_SECTION_NODE) {
return node.getNodeValue();
}
if (node.hasChildNodes()) {
return text(node.getChildNodes());
}
return "";
}
public static String text(NodeList nodeList) {
StringBuilder sb = new StringBuilder();
for (int i = 0; i < nodeList.getLength(); i++) {
sb.append(text(nodeList.item(i)));
}
return sb.toString();
}
public static List list(NodeList self) {
List answer = new ArrayList();
Iterator it = XmlGroovyMethods.iterator(self);
while (it.hasNext()) {
answer.add(it.next());
}
return answer;
}
public static NodeList depthFirst(Element self) {
List result = new ArrayList();
result.add(createNodeList(self));
result.add(self.getElementsByTagName("*"));
return new NodeListsHolder(result);
}
public static void setValue(Element self, String value) {
Node firstChild = self.getFirstChild();
if (firstChild == null) {
firstChild = self.getOwnerDocument().createTextNode(value);
self.appendChild(firstChild);
}
firstChild.setNodeValue(value);
}
public static void putAt(Element self, String property, Object value) {
if (property.startsWith("@")) {
String attributeName = property.substring(1);
Document doc = self.getOwnerDocument();
Attr newAttr = doc.createAttribute(attributeName);
newAttr.setValue(value.toString());
self.setAttributeNode(newAttr);
return;
}
InvokerHelper.setProperty(self, property, value);
}
public static Element appendNode(Element self, Object name) {
return appendNode(self, name, (String)null);
}
public static Element appendNode(Element self, Object name, Map attributes) {
return appendNode(self, name, attributes, null);
}
public static Element appendNode(Element self, Object name, String value) {
Document doc = self.getOwnerDocument();
Element newChild;
if (name instanceof QName) {
QName qn = (QName) name;
newChild = doc.createElementNS(qn.getNamespaceURI(), qn.getQualifiedName());
} else {
newChild = doc.createElement(name.toString());
}
if (value != null) {
Text text = doc.createTextNode(value);
newChild.appendChild(text);
}
self.appendChild(newChild);
return newChild;
}
public static Element appendNode(Element self, Object name, Map attributes, String value) {
Element result = appendNode(self, name, value);
for (Object o : attributes.entrySet()) {
Map.Entry e = (Map.Entry) o;
putAt(result, "@" + e.getKey().toString(), e.getValue());
}
return result;
}
public static Node replaceNode(NodesHolder self, Closure c) {
if (self.getLength() <= 0 || self.getLength() > 1) {
throw new GroovyRuntimeException("replaceNode() can only be used to replace a single element.");
}
return replaceNode(self.item(0), c);
}
public static Node replaceNode(Node self, Closure c) {
if (self.getParentNode() instanceof Document) {
throw new UnsupportedOperationException("Replacing the root node is not supported");
}
appendNodes(self, c);
self.getParentNode().removeChild(self);
return self;
}
public static void plus(Element self, Closure c) {
if (self.getParentNode() instanceof Document) {
throw new UnsupportedOperationException("Adding sibling nodes to the root node is not supported");
}
appendNodes(self, c);
}
private static void appendNodes(Node self, Closure c) {
Node parent = self.getParentNode();
Node beforeNode = self.getNextSibling();
DOMBuilder b = new DOMBuilder(self.getOwnerDocument());
Element newNodes = (Element) b.invokeMethod("rootNode", c);
Iterator iter = XmlGroovyMethods.iterator(children(newNodes));
while (iter.hasNext()) {
parent.insertBefore(iter.next(), beforeNode);
}
}
/**
* Returns the list of any direct String nodes of this node.
*
* @return the list of String values from this node
* @since 2.3.0
*/
public static List localText(Element self) {
List result = new ArrayList();
if (self.getNodeType() == Node.TEXT_NODE || self.getNodeType() == Node.CDATA_SECTION_NODE) {
result.add(self.getNodeValue());
} else if (self.hasChildNodes()) {
NodeList nodeList = self.getChildNodes();
for (int i = 0; i < nodeList.getLength(); i++) {
Node item = nodeList.item(i);
if (item.getNodeType() == Node.TEXT_NODE || item.getNodeType() == Node.CDATA_SECTION_NODE) {
result.add(item.getNodeValue());
}
}
}
return result;
}
public static void plus(NodeList self, Closure c) {
for (int i = 0; i < self.getLength(); i++) {
plus((Element) self.item(i), c);
}
}
private static NodeList createNodeList(Element self) {
List first = new ArrayList();
first.add(self);
return new NodesHolder(first);
}
public static NodeList breadthFirst(Element self) {
List result = new ArrayList();
NodeList thisLevel = createNodeList(self);
while (thisLevel.getLength() > 0) {
result.add(thisLevel);
thisLevel = getNextLevel(thisLevel);
}
return new NodeListsHolder(result);
}
private static NodeList getNextLevel(NodeList thisLevel) {
List result = new ArrayList();
for (int i = 0; i < thisLevel.getLength(); i++) {
Node n = thisLevel.item(i);
if (n instanceof Element) {
result.add(getChildElements((Element) n, "*"));
}
}
return new NodeListsHolder(result);
}
public static NodeList children(Element self) {
return getChildElements(self, "*");
}
private static boolean hasChildElements(Element self, String elementName) {
return getChildElements(self, elementName).getLength() > 0;
}
private static NodeList getChildElements(Element self, String elementName) {
List result = new ArrayList();
NodeList nodeList = self.getChildNodes();
for (int i = 0; i < nodeList.getLength(); i++) {
Node node = nodeList.item(i);
if (node.getNodeType() == Node.ELEMENT_NODE) {
Element child = (Element) node;
if ("*".equals(elementName) || child.getTagName().equals(elementName)) {
result.add(child);
}
} else if (node.getNodeType() == Node.TEXT_NODE) {
String value = node.getNodeValue();
if ((!isGlobalKeepIgnorableWhitespace() && value.trim().length() == 0) || isGlobalTrimWhitespace()) {
value = value.trim();
}
if ("*".equals(elementName) && value.length() > 0) {
node.setNodeValue(value);
result.add(node);
}
}
}
return new NodesHolder(result);
}
public static String toString(Object o) {
if (o instanceof Node) {
if (((Node) o).getNodeType() == Node.TEXT_NODE) {
return ((Node) o).getNodeValue();
}
}
if (o instanceof NodeList) {
return toString((NodeList) o);
}
return o.toString();
}
public static Object xpath(Node self, String expression, javax.xml.namespace.QName returnType) {
final XPath xpath = XPathFactory.newInstance().newXPath();
try {
return xpath.evaluate(expression, self, returnType);
} catch (XPathExpressionException e) {
throw new GroovyRuntimeException(e);
}
}
public static String xpath(Node self, String expression) {
final XPath xpath = XPathFactory.newInstance().newXPath();
try {
return xpath.evaluate(expression, self);
} catch (XPathExpressionException e) {
throw new GroovyRuntimeException(e);
}
}
private static String toString(NodeList self) {
StringBuilder sb = new StringBuilder();
sb.append("[");
Iterator it = XmlGroovyMethods.iterator(self);
while (it.hasNext()) {
if (sb.length() > 1) sb.append(", ");
sb.append(it.next().toString());
}
sb.append("]");
return sb.toString();
}
public static int size(NodeList self) {
return self.getLength();
}
public static boolean isEmpty(NodeList self) {
return size(self) == 0;
}
@SuppressWarnings("unchecked")
private static void addResult(List results, Object result) {
if (result != null) {
if (result instanceof Collection) {
results.addAll((Collection) result);
} else {
results.add(result);
}
}
}
private static final class NodeListsHolder implements NodeList {
private List nodeLists;
private NodeListsHolder(List nodeLists) {
this.nodeLists = nodeLists;
}
public int getLength() {
int length = 0;
for (NodeList nl : nodeLists) {
length += nl.getLength();
}
return length;
}
public Node item(int index) {
int relativeIndex = index;
for (NodeList nl : nodeLists) {
if (relativeIndex < nl.getLength()) {
return nl.item(relativeIndex);
}
relativeIndex -= nl.getLength();
}
return null;
}
public String toString() {
return DOMCategory.toString(this);
}
}
private static final class NodesHolder implements NodeList {
private List nodes;
private NodesHolder(List nodes) {
this.nodes = nodes;
}
public int getLength() {
return nodes.size();
}
public Node item(int index) {
if (index < 0 || index >= getLength()) {
return null;
}
return nodes.get(index);
}
}
}