First draft of JXPath.

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@273170 13f79535-47bb-0310-9956-ffa450edef68

proposal/embed/src/java/org/apache/tools/ant/tasks/optional/JXPath.java

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+/*
+ * The Apache Software License, Version 1.1
+ *
+ * Copyright (c) 2000-2002 The Apache Software Foundation.  All rights
+ * reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * 3. The end-user documentation included with the redistribution, if
+ *    any, must include the following acknowlegement:
+ *       "This product includes software developed by the
+ *        Apache Software Foundation (http://www.apache.org/)."
+ *    Alternately, this acknowlegement may appear in the software itself,
+ *    if and wherever such third-party acknowlegements normally appear.
+ *
+ * 4. The names "The Jakarta Project", "Ant", and "Apache Software
+ *    Foundation" must not be used to endorse or promote products derived
+ *    from this software without prior written permission. For written
+ *    permission, please contact apache@apache.org.
+ *
+ * 5. Products derived from this software may not be called "Apache"
+ *    nor may "Apache" appear in their names without prior written
+ *    permission of the Apache Group.
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
+ * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
+ * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ * ====================================================================
+ *
+ * This software consists of voluntary contributions made by many
+ * individuals on behalf of the Apache Software Foundation.  For more
+ * information on the Apache Software Foundation, please see
+ * <http://www.apache.org/>.
+ */
+
+package org.apache.tools.ant.taskdefs.optional;
+
+import org.apache.tools.ant.*;
+import org.apache.tools.ant.types.*;
+
+import java.io.*;
+import java.util.*;
+import org.xml.sax.Locator;
+import org.xml.sax.InputSource;
+//import org.xml.sax.HandlerBase;
+import org.xml.sax.SAXParseException;
+import org.xml.sax.XMLReader;
+import org.xml.sax.SAXException;
+import org.xml.sax.DocumentHandler;
+import org.xml.sax.Attributes;
+import org.xml.sax.AttributeList;
+import org.xml.sax.helpers.XMLReaderAdapter;
+import org.xml.sax.helpers.DefaultHandler;
+import org.xml.sax.helpers.AttributeListImpl;
+
+import javax.xml.parsers.SAXParserFactory;
+import javax.xml.parsers.SAXParser;
+import javax.xml.parsers.ParserConfigurationException;
+
+import org.apache.commons.jxpath.*;
+
+// Experimental: need to add code to select the 'root', etc.
+
+/**
+ *  Enable JXPath dynamic properties
+ *  
+ *
+ * @author Costin Manolache
+ */
+public class JXPath extends Task implements PropertyInterceptor {
+    JXPathContext jxpathCtx;
+    
+    public JXPath() {
+    }
+
+    public Object getProperty( Project p, String ns, String name ) {
+        if( ! name.startsWith("jxpath:" ) )
+            return null;
+        System.out.println("JXPath: getProperty " + ns + " " + name );
+        name=name.substring( 7 );
+        return jxpathCtx.getValue( name );
+    }
+
+    
+    public void execute() {
+        PropertyHelper phelper=PropertyHelper.getPropertyHelper( project );
+        phelper.addPropertyInterceptor( this );
+
+        jxpathCtx=JXPathContext.newContext( project );
+    }
+
+}