| /* |
| * $Id$ |
| * |
| * Copyright 1999-2004 The Apache Software Foundation. |
| * |
| * 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. |
| */ |
| |
| package org.apache.struts.taskdefs; |
| |
| import java.io.BufferedInputStream; |
| import java.io.File; |
| import java.io.FileOutputStream; |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import org.w3c.dom.Document; |
| import org.w3c.dom.Element; |
| import org.w3c.dom.Node; |
| import org.w3c.dom.NodeList; |
| |
| /** |
| * General purpose utility class. |
| * |
| * @version $Rev$ $Date$ |
| */ |
| public class Util { |
| /** |
| * Returns the list of named descendents. Allows the user |
| * to specify '/' separated path to the child element. e.g. |
| * 'a/b/c'. Note, that if 'a' has multiple child elements |
| * named 'b', the method will go to the first 'b' element, |
| * and return all child elements named 'c'. Returns an |
| * empty List if the path does not return any elements. |
| * |
| * @param elem The parent/context element |
| * @param path '/' separated path |
| * @return List of elements as per the path. |
| */ |
| public static List getElements(Element elem, String path) { |
| List list = new ArrayList(); |
| if (elem == null) |
| return list; |
| |
| int ndx = path.indexOf("/"); |
| if (ndx != -1) { |
| Element child = getElement(elem, path.substring(0, ndx)); |
| return getElements(child, path.substring(ndx + 1)); |
| } |
| NodeList nl = elem.getChildNodes(); |
| for (int i = 0, len = nl.getLength(); i < len; i++) { |
| Node node = nl.item(i); |
| if (node.getNodeType() == Node.ELEMENT_NODE |
| && node.getNodeName().equals(path)) { |
| list.add(node); |
| } |
| } |
| return list; |
| } |
| /** |
| * Returns the named descendent. Allows the user |
| * to specify '/' separated path to the child element. e.g. |
| * 'a/b/c'. Note, that in case of multiple children with the |
| * same name, the first child is returned. Returns a null, if |
| * the path does not map to any element. |
| * |
| * @param elem The parent/context element |
| * @param path '/' separated path |
| * @return Named element as per the path. |
| */ |
| public static Element getElement(Element elem, String path) { |
| List elems = getElements(elem, path); |
| if (elems.size() == 0) |
| return null; |
| else |
| return (Element) elems.get(0); |
| } |
| /** |
| * Returns the text value of the named descendent. Allows the user |
| * to specify '/' separated path to the child element. e.g. |
| * 'a/b/c'. Note, that in case of multiple children with the |
| * same name, the first child is considered. The text value |
| * is determined by concatenating all the text children. Returns |
| * an empty String if node is not found. |
| * |
| * @param elem The parent/context element |
| * @param path '/' separated path |
| * @return Text value of the name descendent. |
| */ |
| public static String getElementValue(Element elem, String path) { |
| Element child = getElement(elem, path); |
| if (child == null) |
| return ""; |
| |
| String ret = ""; |
| NodeList nl = child.getChildNodes(); |
| for (int i = 0, len = nl.getLength(); i < len; i++) { |
| Node node = nl.item(i); |
| if (node.getNodeType() == Node.TEXT_NODE) |
| ret += node.getNodeValue(); |
| } |
| return ret; |
| } |
| /** |
| * Adds a Child element to the parent node. If the 'value' is |
| * not null, a Text node with the same value is appended to the |
| * Child. |
| * @param parent The parent node |
| * @param tag The child element name |
| * @param value Value of text node appended to the Child |
| * @return the newly added Child node. |
| */ |
| public static Element addChildElement( |
| Node parent, |
| String tag, |
| String value) { |
| Document doc = |
| (parent.getNodeType() == Node.DOCUMENT_NODE) |
| ? (Document) parent |
| : parent.getOwnerDocument(); |
| Element child = doc.createElement(tag); |
| if (value != null) |
| child.appendChild(doc.createTextNode(value)); |
| parent.appendChild(child); |
| return child; |
| } |
| |
| /** |
| * Copies a given resource from classpath to the destination file. |
| * Uses Util.class.getResourceAsStream(resPath) internally. |
| * @param resPath Path to the resource |
| * @param dstFile Destination file |
| * @return true, if the file is copied successfully. |
| */ |
| public static boolean copyFile(String resPath, File dstFile) { |
| try { |
| BufferedInputStream bis = |
| new BufferedInputStream( |
| Util.class.getResourceAsStream(resPath)); |
| FileOutputStream fos = new FileOutputStream(dstFile); |
| int offset = 0, len = 0; |
| byte[] buffer = new byte[2 * 1024]; |
| while ((len = bis.read(buffer, 0, buffer.length)) != -1) { |
| fos.write(buffer, 0, len); |
| offset += len; |
| } |
| bis.close(); |
| fos.flush(); |
| fos.close(); |
| return true; |
| } catch (Exception e) { |
| e.printStackTrace(); |
| } |
| return false; |
| } |
| |
| } |