| /******************************************************************************* |
| * Copyright (c) 2000, 2003 IBM Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Common Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/cpl-v10.html |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.jface.text.templates.persistence; |
| |
| import java.io.IOException; |
| import java.io.Reader; |
| import java.io.Writer; |
| import java.util.ArrayList; |
| import java.util.Collection; |
| import java.util.HashSet; |
| import java.util.MissingResourceException; |
| import java.util.ResourceBundle; |
| import java.util.Set; |
| |
| import javax.xml.parsers.DocumentBuilder; |
| import javax.xml.parsers.DocumentBuilderFactory; |
| import javax.xml.parsers.ParserConfigurationException; |
| import javax.xml.transform.OutputKeys; |
| import javax.xml.transform.Transformer; |
| import javax.xml.transform.TransformerException; |
| import javax.xml.transform.TransformerFactory; |
| import javax.xml.transform.dom.DOMSource; |
| import javax.xml.transform.stream.StreamResult; |
| |
| import org.w3c.dom.Attr; |
| import org.w3c.dom.Document; |
| import org.w3c.dom.NamedNodeMap; |
| import org.w3c.dom.Node; |
| import org.w3c.dom.NodeList; |
| import org.w3c.dom.Text; |
| import org.xml.sax.InputSource; |
| import org.xml.sax.SAXException; |
| |
| import org.eclipse.jface.text.Assert; |
| import org.eclipse.jface.text.templates.Template; |
| |
| /** |
| * <code>TemplateSet</code> manages a collection of templates and makes them |
| * persistent. |
| * |
| * @since 3.0 |
| */ |
| public class TemplateReaderWriter { |
| |
| private static final String TEMPLATE_ROOT = "templates"; //$NON-NLS-1$ |
| private static final String TEMPLATE_ELEMENT = "template"; //$NON-NLS-1$ |
| private static final String NAME_ATTRIBUTE= "name"; //$NON-NLS-1$ |
| private static final String ID_ATTRIBUTE= "id"; //$NON-NLS-1$ |
| private static final String DESCRIPTION_ATTRIBUTE= "description"; //$NON-NLS-1$ |
| private static final String CONTEXT_ATTRIBUTE= "context"; //$NON-NLS-1$ |
| private static final String ENABLED_ATTRIBUTE= "enabled"; //$NON-NLS-1$ |
| private static final String DELETED_ATTRIBUTE= "deleted"; //$NON-NLS-1$ |
| |
| /** |
| * Reads templates from an XML reader and adds them to the templates. |
| * |
| * @param reader the XML reader to read templates from |
| * @return the read templates, encapsulated in instances of <code>TemplatePersistenceData</code> |
| * @throws SAXException if the XML is not valid |
| * @throws IOException if reading from the stream fails |
| */ |
| public TemplatePersistenceData[] read(Reader reader) throws SAXException, IOException { |
| return read(reader, null); |
| } |
| |
| /** |
| * Reads templates from an XML stream and adds them to the templates. |
| * |
| * @param reader the XML reader to read templates from |
| * @param bundle a resource bundle to use for translating the read templates, or <code>null</code> if no translation should occur |
| * @return the read templates, encapsulated in instances of <code>TemplatePersistenceData</code> |
| * @throws SAXException if the XML is not valid |
| * @throws IOException if reading from the stream fails |
| */ |
| public TemplatePersistenceData[] read(Reader reader, ResourceBundle bundle) throws SAXException, IOException { |
| |
| try { |
| Collection templates= new ArrayList(); |
| Set ids= new HashSet(); |
| |
| DocumentBuilderFactory factory= DocumentBuilderFactory.newInstance(); |
| DocumentBuilder parser= factory.newDocumentBuilder(); |
| Document document= parser.parse(new InputSource(reader)); |
| |
| NodeList elements= document.getElementsByTagName(TEMPLATE_ELEMENT); |
| |
| int count= elements.getLength(); |
| for (int i= 0; i != count; i++) { |
| Node node= elements.item(i); |
| NamedNodeMap attributes= node.getAttributes(); |
| |
| if (attributes == null) |
| continue; |
| |
| String id= getStringValue(attributes, ID_ATTRIBUTE, null); |
| if (id != null && ids.contains(id)) |
| throw new SAXException(TemplateMessages.getString("TemplateReaderWriter.duplicate.id")); //$NON-NLS-1$ |
| |
| boolean deleted = getBooleanValue(attributes, DELETED_ATTRIBUTE, false); |
| |
| String name= getStringValue(attributes, NAME_ATTRIBUTE); |
| name= translateString(name, bundle); |
| |
| String description= getStringValue(attributes, DESCRIPTION_ATTRIBUTE, ""); //$NON-NLS-1$ |
| description= translateString(description, bundle); |
| |
| String context= getStringValue(attributes, CONTEXT_ATTRIBUTE); |
| |
| if (name == null || context == null) |
| throw new SAXException(TemplateMessages.getString("TemplateReaderWriter.error.missing_attribute")); //$NON-NLS-1$ |
| |
| boolean enabled = getBooleanValue(attributes, ENABLED_ATTRIBUTE, true); |
| |
| StringBuffer buffer= new StringBuffer(); |
| NodeList children= node.getChildNodes(); |
| for (int j= 0; j != children.getLength(); j++) { |
| String value= children.item(j).getNodeValue(); |
| if (value != null) |
| buffer.append(value); |
| } |
| String pattern= buffer.toString(); |
| pattern= translateString(pattern, bundle); |
| |
| Template template= new Template(name, description, context, pattern); |
| TemplatePersistenceData data= new TemplatePersistenceData(template, enabled, id); |
| data.setDeleted(deleted); |
| |
| templates.add(data); |
| } |
| |
| return (TemplatePersistenceData[]) templates.toArray(new TemplatePersistenceData[templates.size()]); |
| |
| } catch (ParserConfigurationException e) { |
| Assert.isTrue(false); |
| } |
| |
| return null; // dummy |
| } |
| |
| /** |
| * Saves the templates as XML. |
| * |
| * @param templates the templates to save |
| * @param writer the writer to write the templates to in XML |
| * @throws IOException if writing the templates fails |
| */ |
| public void save(TemplatePersistenceData[] templates, Writer writer) throws IOException { |
| try { |
| DocumentBuilderFactory factory= DocumentBuilderFactory.newInstance(); |
| DocumentBuilder builder= factory.newDocumentBuilder(); |
| Document document= builder.newDocument(); |
| |
| Node root= document.createElement(TEMPLATE_ROOT); //$NON-NLS-1$ |
| document.appendChild(root); |
| |
| for (int i= 0; i < templates.length; i++) { |
| TemplatePersistenceData data= templates[i]; |
| Template template= data.getTemplate(); |
| |
| Node node= document.createElement(TEMPLATE_ELEMENT); |
| root.appendChild(node); |
| |
| NamedNodeMap attributes= node.getAttributes(); |
| |
| String id= data.getId(); |
| if (id != null) { |
| Attr idAttr= document.createAttribute(ID_ATTRIBUTE); |
| idAttr.setValue(id); |
| attributes.setNamedItem(idAttr); |
| } |
| |
| if (template != null) { |
| Attr name= document.createAttribute(NAME_ATTRIBUTE); |
| name.setValue(template.getName()); |
| attributes.setNamedItem(name); |
| } |
| |
| if (template != null) { |
| Attr description= document.createAttribute(DESCRIPTION_ATTRIBUTE); |
| description.setValue(template.getDescription()); |
| attributes.setNamedItem(description); |
| } |
| |
| if (template != null) { |
| Attr context= document.createAttribute(CONTEXT_ATTRIBUTE); |
| context.setValue(template.getContextTypeId()); |
| attributes.setNamedItem(context); |
| } |
| |
| Attr enabled= document.createAttribute(ENABLED_ATTRIBUTE); |
| enabled.setValue(data.isEnabled() ? Boolean.toString(true) : Boolean.toString(false)); //$NON-NLS-1$ //$NON-NLS-2$ |
| attributes.setNamedItem(enabled); |
| |
| Attr deleted= document.createAttribute(DELETED_ATTRIBUTE); |
| deleted.setValue(data.isDeleted() ? Boolean.toString(true) : Boolean.toString(false)); //$NON-NLS-1$ //$NON-NLS-2$ |
| attributes.setNamedItem(deleted); |
| |
| if (template != null) { |
| Text pattern= document.createTextNode(template.getPattern()); |
| node.appendChild(pattern); |
| } |
| } |
| |
| |
| Transformer transformer=TransformerFactory.newInstance().newTransformer(); |
| transformer.setOutputProperty(OutputKeys.METHOD, "xml"); //$NON-NLS-1$ |
| transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8"); //$NON-NLS-1$ |
| DOMSource source = new DOMSource(document); |
| StreamResult result = new StreamResult(writer); |
| |
| transformer.transform(source, result); |
| |
| } catch (ParserConfigurationException e) { |
| Assert.isTrue(false); |
| } catch (TransformerException e) { |
| if (e.getException() instanceof IOException) |
| throw (IOException) e.getException(); |
| Assert.isTrue(false); |
| } |
| } |
| |
| private boolean getBooleanValue(NamedNodeMap attributes, String attribute, boolean defaultValue) throws SAXException { |
| Node enabledNode= attributes.getNamedItem(attribute); |
| if (enabledNode == null) |
| return defaultValue; |
| else if (enabledNode.getNodeValue().equals(Boolean.toString(true))) |
| return true; |
| else if (enabledNode.getNodeValue().equals(Boolean.toString(false))) |
| return false; |
| else |
| throw new SAXException(TemplateMessages.getString("TemplateReaderWriter.error.illegal_boolean_attribute")); //$NON-NLS-1$ |
| } |
| |
| private String getStringValue(NamedNodeMap attributes, String name) throws SAXException { |
| String val= getStringValue(attributes, name, null); |
| if (val == null) |
| throw new SAXException(TemplateMessages.getString("TemplateReaderWriter.error.missing_attribute")); //$NON-NLS-1$ |
| return val; |
| } |
| |
| private String getStringValue(NamedNodeMap attributes, String name, String defaultValue) { |
| Node node= attributes.getNamedItem(name); |
| return node == null ? defaultValue : node.getNodeValue(); |
| } |
| |
| private String translateString(String str, ResourceBundle bundle) { |
| if (bundle == null) |
| return str; |
| |
| int idx= str.indexOf('%'); |
| if (idx == -1) { |
| return str; |
| } |
| StringBuffer buf= new StringBuffer(); |
| int k= 0; |
| while (idx != -1) { |
| buf.append(str.substring(k, idx)); |
| for (k= idx + 1; k < str.length() && !Character.isWhitespace(str.charAt(k)); k++) { |
| // loop |
| } |
| String key= str.substring(idx + 1, k); |
| buf.append(getBundleString(key, bundle)); |
| idx= str.indexOf('%', k); |
| } |
| buf.append(str.substring(k)); |
| return buf.toString(); |
| } |
| |
| private String getBundleString(String key, ResourceBundle bundle) { |
| if (bundle != null) { |
| try { |
| return bundle.getString(key); |
| } catch (MissingResourceException e) { |
| return '!' + key + '!'; |
| } |
| } else |
| return TemplateMessages.getString(key); // default messages |
| } |
| } |
| |