| /* |
| * 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 org.apache.felix.scrplugin.xml; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.OutputStream; |
| import java.io.OutputStreamWriter; |
| import java.io.Writer; |
| import java.util.Properties; |
| |
| import javax.xml.transform.OutputKeys; |
| import javax.xml.transform.Transformer; |
| import javax.xml.transform.TransformerException; |
| import javax.xml.transform.TransformerFactory; |
| import javax.xml.transform.sax.SAXResult; |
| import javax.xml.transform.sax.SAXTransformerFactory; |
| import javax.xml.transform.sax.TransformerHandler; |
| import javax.xml.transform.stream.StreamResult; |
| import javax.xml.transform.stream.StreamSource; |
| |
| import org.xml.sax.ContentHandler; |
| import org.xml.sax.SAXException; |
| import org.xml.sax.helpers.AttributesImpl; |
| |
| /** |
| * Utility class for xml/sax handling. |
| */ |
| public class IOUtils { |
| |
| /** The transformer factory. */ |
| private static final SAXTransformerFactory FACTORY = (SAXTransformerFactory) TransformerFactory.newInstance(); |
| |
| /** |
| * Parse a file and send the sax events to the content handler. |
| * @param file |
| * @param handler |
| * @throws TransformerException |
| */ |
| public static final void parse(final InputStream file, final ContentHandler handler) |
| throws TransformerException { |
| final Transformer transformer = FACTORY.newTransformer(); |
| transformer.transform( new StreamSource( file ), new SAXResult( handler ) ); |
| } |
| |
| /** |
| * Get a serializer to write XML to a file. |
| */ |
| public static ContentHandler getSerializer(final OutputStream outputStream) |
| throws TransformerException, IOException { |
| final Writer writer = new OutputStreamWriter(outputStream, "UTF-8"); |
| |
| final TransformerHandler transformerHandler = FACTORY.newTransformerHandler(); |
| final Transformer transformer = transformerHandler.getTransformer(); |
| |
| final Properties format = new Properties(); |
| format.put(OutputKeys.METHOD, "xml"); |
| format.put(OutputKeys.OMIT_XML_DECLARATION, "no"); |
| format.put(OutputKeys.ENCODING, "UTF-8"); |
| format.put(OutputKeys.INDENT, "yes"); |
| |
| transformer.setOutputProperties(format); |
| |
| transformerHandler.setResult(new StreamResult(writer)); |
| |
| return transformerHandler; |
| } |
| |
| /** |
| * Helper method to add an attribute. |
| * This implementation adds a new attribute with the given name |
| * and value. Before adding the value is checked for non-null. |
| * @param ai The attributes impl receiving the additional attribute. |
| * @param name The name of the attribute. |
| * @param value The value of the attribute. |
| */ |
| public static void addAttribute(final AttributesImpl ai, final String name, final Object value) { |
| if ( value != null ) { |
| ai.addAttribute("", name, name, "CDATA", value.toString()); |
| } |
| } |
| |
| /** |
| * Helper method writing out a string. |
| * @param ch The content handler. |
| * @param text |
| * @throws SAXException |
| */ |
| public static void text(final ContentHandler ch, final String text) |
| throws SAXException { |
| if ( text != null ) { |
| final char[] c = text.toCharArray(); |
| ch.characters(c, 0, c.length); |
| } |
| } |
| |
| /** |
| * Helper method to indent the xml elements. |
| * Each level is indented with four spaces. |
| * @param ch The content handler. |
| * @param level The level of indention. |
| */ |
| public static void indent(final ContentHandler ch, final int level) |
| throws SAXException { |
| for(int i=0;i<level;i++) { |
| IOUtils.text(ch, " "); |
| } |
| } |
| |
| /** |
| * Helper method to create a new line. |
| * @param ch The content handler. |
| * @throws SAXException |
| */ |
| public static void newline(final ContentHandler ch) |
| throws SAXException { |
| IOUtils.text(ch, "\n"); |
| } |
| } |