| /******************************************************************************* |
| * Copyright (c) 2004, 2008 Tasktop Technologies and others. |
| * |
| * This program and the accompanying materials are made available under the |
| * terms of the Eclipse Public License v. 2.0 which is available at |
| * https://www.eclipse.org/legal/epl-2.0 |
| * |
| * SPDX-License-Identifier: EPL-2.0 |
| * |
| * Contributors: |
| * Tasktop Technologies - initial API and implementation |
| *******************************************************************************/ |
| |
| package org.eclipse.mylyn.internal.tasks.core.data; |
| |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| import org.xml.sax.Attributes; |
| import org.xml.sax.SAXException; |
| import org.xml.sax.helpers.DefaultHandler; |
| |
| class ElementHandler extends DefaultHandler { |
| |
| protected final StringBuilder currentElementText; |
| |
| private ElementHandler currentHandler; |
| |
| private final String elementName; |
| |
| private final Map<String, ElementHandler> handlers; |
| |
| private final ElementHandler parent; |
| |
| public ElementHandler(ElementHandler parent, String elementName) { |
| this.parent = parent; |
| this.elementName = elementName; |
| this.handlers = new HashMap<String, ElementHandler>(); |
| this.currentElementText = new StringBuilder(); |
| } |
| |
| public void addElementHandler(ElementHandler handler) { |
| handlers.put(handler.getElementName(), handler); |
| } |
| |
| @Override |
| public void characters(char[] ch, int start, int length) throws SAXException { |
| if (currentHandler != null) { |
| currentHandler.characters(ch, start, length); |
| } else { |
| currentElementText.append(ch, start, length); |
| } |
| } |
| |
| protected void done(ElementHandler elementHandler) { |
| currentHandler = null; |
| } |
| |
| protected void end(String uri, String localName, String name) { |
| } |
| |
| @Override |
| public void endElement(String uri, String localName, String name) throws SAXException { |
| if (currentHandler != null) { |
| currentHandler.endElement(uri, localName, name); |
| } else if (elementName.equals(localName)) { |
| end(uri, localName, name); |
| if (parent != null) { |
| parent.done(this); |
| } |
| } |
| } |
| |
| protected void clearCurrentElementText() { |
| currentElementText.setLength(0); |
| } |
| |
| protected String getCurrentElementText() { |
| return currentElementText.toString(); |
| } |
| |
| public String getElementName() { |
| return elementName; |
| } |
| |
| protected String getOptionalValue(Attributes attributes, String name) throws SAXException { |
| String value = attributes.getValue(name); |
| if (value == null) { |
| return ""; //$NON-NLS-1$ |
| } |
| return value; |
| } |
| |
| public ElementHandler getParent() { |
| return parent; |
| } |
| |
| protected String getValue(Attributes attributes, String name) throws SAXException { |
| String value = attributes.getValue(name); |
| if (value == null) { |
| throw new SAXException("Missing required attribute \"" + name + "\""); //$NON-NLS-1$ //$NON-NLS-2$ |
| } |
| return value; |
| } |
| |
| public void removeElementHandler(ElementHandler handler) { |
| handlers.remove(handler.getElementName()); |
| } |
| |
| protected void start(String uri, String localName, String name, Attributes attributes) throws SAXException { |
| } |
| |
| @Override |
| public void startElement(String uri, String localName, String name, Attributes attributes) throws SAXException { |
| if (currentHandler == null) { |
| ElementHandler handler = handlers.get(name); |
| if (handler != null) { |
| currentHandler = handler; |
| currentHandler.start(uri, localName, name, attributes); |
| } |
| } else if (currentHandler != null) { |
| currentHandler.startElement(uri, localName, name, attributes); |
| } |
| } |
| } |