| /* |
| * Copyright 2003-2007 the original author or authors. |
| * |
| * 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 groovy.text; |
| |
| import groovy.lang.Binding; |
| import groovy.lang.GroovyShell; |
| import groovy.lang.Script; |
| import groovy.lang.Writable; |
| import groovy.util.IndentPrinter; |
| import groovy.util.Node; |
| import groovy.util.XmlNodePrinter; |
| import groovy.util.XmlParser; |
| import groovy.xml.QName; |
| |
| import java.io.IOException; |
| import java.io.PrintWriter; |
| import java.io.Reader; |
| import java.io.StringWriter; |
| import java.io.Writer; |
| import java.lang.ref.WeakReference; |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| import javax.xml.parsers.ParserConfigurationException; |
| |
| import org.codehaus.groovy.control.CompilationFailedException; |
| import org.codehaus.groovy.runtime.InvokerHelper; |
| import org.xml.sax.SAXException; |
| |
| /** |
| * Template engine for xml data input. |
| * |
| * @author Christian Stein |
| */ |
| public class XmlTemplateEngine extends TemplateEngine { |
| |
| private static class GspPrinter extends XmlNodePrinter { |
| |
| public GspPrinter(PrintWriter out, String indent) { |
| this(new IndentPrinter(out, indent)); |
| } |
| |
| public GspPrinter(IndentPrinter out) { |
| super(out, "\\\""); |
| } |
| |
| protected void printGroovyTag(String tag, String text) { |
| if (tag.equals("scriptlet")) { |
| out.print(text); |
| out.print("\n"); |
| return; |
| } |
| if (tag.equals("expression")) { |
| printLineBegin(); |
| out.print("${"); |
| out.print(text); |
| out.print("}"); |
| printLineEnd(); |
| return; |
| } |
| throw new RuntimeException("Unsupported tag named \"" + tag + "\"."); |
| } |
| |
| protected void printLineBegin() { |
| out.print("out.print(\""); |
| out.printIndent(); |
| } |
| |
| protected void printLineEnd(String comment) { |
| out.print("\\n\");"); |
| if (comment != null) { |
| out.print(" // "); |
| out.print(comment); |
| } |
| out.print("\n"); |
| } |
| |
| protected boolean printSpecialNode(Node node) { |
| Object name = node.name(); |
| if (name != null && name instanceof QName) { |
| /* |
| * FIXME Somethings wrong with the SAX- or XMLParser. Prefix should only contain 'gsp'?! |
| */ |
| String s = ((QName) name).getPrefix(); |
| if (s.startsWith("gsp:")) { |
| s = s.substring(4); // 4 = "gsp:".length() |
| if (s.length() == 0) { |
| throw new RuntimeException("No local part after 'gsp:' given in node " + node); |
| } |
| printGroovyTag(s, node.text()); |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| } |
| |
| private static class XmlTemplate implements Template { |
| |
| private final Script script; |
| |
| public XmlTemplate(Script script) { |
| this.script = script; |
| } |
| |
| public Writable make() { |
| return make(new HashMap()); |
| } |
| |
| public Writable make(Map map) { |
| if (map == null) { |
| throw new IllegalArgumentException("map must not be null"); |
| } |
| return new XmlWritable(script, new Binding(map)); |
| } |
| |
| } |
| |
| private static class XmlWritable implements Writable { |
| |
| private final Binding binding; |
| private final Script script; |
| private WeakReference result; |
| |
| public XmlWritable(Script script, Binding binding) { |
| this.script = script; |
| this.binding = binding; |
| this.result = new WeakReference(null); |
| } |
| |
| public Writer writeTo(Writer out) { |
| Script scriptObject = InvokerHelper.createScript(script.getClass(), binding); |
| PrintWriter pw = new PrintWriter(out); |
| scriptObject.setProperty("out", pw); |
| scriptObject.run(); |
| pw.flush(); |
| return out; |
| } |
| |
| public String toString() { |
| if (result.get() != null) { |
| return result.get().toString(); |
| } |
| String string = writeTo(new StringWriter(1024)).toString(); |
| result = new WeakReference(string); |
| return string; |
| } |
| |
| } |
| |
| public static final String DEFAULT_INDENTION = " "; |
| |
| private final GroovyShell groovyShell; |
| private final XmlParser xmlParser; |
| private String indention; |
| |
| public XmlTemplateEngine() throws SAXException, ParserConfigurationException { |
| this(DEFAULT_INDENTION, false); |
| } |
| |
| public XmlTemplateEngine(String indention, boolean validating) throws SAXException, ParserConfigurationException { |
| this(new XmlParser(validating, true), new GroovyShell(), indention); |
| } |
| |
| public XmlTemplateEngine(XmlParser xmlParser, GroovyShell groovyShell, String indention) { |
| this.groovyShell = groovyShell; |
| this.xmlParser = xmlParser; |
| this.indention = indention; |
| } |
| |
| public Template createTemplate(Reader reader) throws CompilationFailedException, ClassNotFoundException, IOException { |
| Node root = null; |
| try { |
| root = xmlParser.parse(reader); |
| } catch (SAXException e) { |
| throw new RuntimeException("Parsing XML source failed.", e); |
| } |
| |
| if (root == null) { |
| throw new IOException("Parsing XML source failed: root node is null."); |
| } |
| |
| // new NodePrinter().print(root); |
| // new XmlNodePrinter().print(root); |
| |
| StringWriter writer = new StringWriter(1024); |
| writer.write("/* Generated by XmlTemplateEngine */\n"); |
| new GspPrinter(new PrintWriter(writer), DEFAULT_INDENTION).print(root); |
| String scriptText = writer.toString(); |
| |
| // System.err.println("\n-\n" + scriptText + "\n-\n"); |
| |
| Script script = groovyShell.parse(scriptText); |
| Template template = new XmlTemplate(script); |
| return template; |
| } |
| |
| public String getIndention() { |
| return indention; |
| } |
| |
| public void setIndention(String indention) { |
| if (indention == null) { |
| indention = DEFAULT_INDENTION; |
| } |
| this.indention = indention; |
| } |
| |
| public String toString() { |
| return "XmlTemplateEngine"; |
| } |
| |
| } |