package org.eclipse.ant.internal.core.ant;

/*
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 1999, 2000 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/>.
 */
 
 
/**********************************************************************
Copyright (c) 2003 IBM Corp.  All rights reserved.
This file is 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
**********************************************************************/

import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.Properties;

import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.Project;
import org.apache.tools.ant.ProjectComponent;

/**
 * A subclass of Project to facilitate "faster" parsing with
 * less garbage generated. This class is not used on Ant 1.6 and newer
 * due to the improvements in lazy loading of these Ant versions.
 * 
 * Only three tasks are loaded (property, taskdef and 
 * typedef: three tasks that can be defined outside of a target on Ant 1.5.1 or older).
 *
 * Datatypes are loaded if requested.
 * 
 * Derived from the original Ant Project class
 */
public class InternalProject extends Project {

	private Hashtable typeNameToClass = null;
	
	public InternalProject() {
		super();
	}

	/* (non-Javadoc)
	 * @see org.apache.tools.ant.Project#init()
	 */
	public void init() throws BuildException {
		setJavaVersionProperty();

		try {
			Class taskClass = Class.forName("org.apache.tools.ant.taskdefs.Property"); //$NON-NLS-1$
			addTaskDefinition("property", taskClass); //$NON-NLS-1$
			taskClass = Class.forName("org.apache.tools.ant.taskdefs.Typedef"); //$NON-NLS-1$
			addTaskDefinition("typedef", taskClass); //$NON-NLS-1$
			taskClass = Class.forName("org.apache.tools.ant.taskdefs.Taskdef"); //$NON-NLS-1$
			addTaskDefinition("taskdef", taskClass); //$NON-NLS-1$
		} catch (NoClassDefFoundError e) {
			throw new BuildException(InternalAntMessages.getString("InternalAntRunner.Missing_Class"), e); //$NON-NLS-1$
		} catch (ClassNotFoundException c) {
			throw new BuildException(InternalAntMessages.getString("InternalAntRunner.Missing_Class"), c); //$NON-NLS-1$
		}

		setSystemProperties();
	}

	/* (non-Javadoc)
	 * @see org.apache.tools.ant.Project#createDataType(java.lang.String)
	 */
	public Object createDataType(String typeName) throws BuildException {
		if (typeNameToClass == null) {
			initializeTypes();
		}
		Class typeClass = (Class) typeNameToClass.get(typeName);

		if (typeClass == null) {
			return null;
		}

		try {
			Constructor ctor = null;
			boolean noArg = false;
			// DataType can have a "no arg" constructor or take a single
			// Project argument.
			try {
				ctor = typeClass.getConstructor(new Class[0]);
				noArg = true;
			} catch (NoSuchMethodException nse) {
				ctor = typeClass.getConstructor(new Class[] { Project.class });
				noArg = false;
			}

			Object o = null;
			if (noArg) {
				o = ctor.newInstance(new Object[0]);
			} else {
				o = ctor.newInstance(new Object[] { this });
			}
			if (o instanceof ProjectComponent) {
				((ProjectComponent) o).setProject(this);
			}
			return o;
		} catch (InvocationTargetException ite) {
			return null;
		} catch (Throwable t) {
			return null;
		}
	}

	/**
	 * Initialize the mapping of data type name to data type classname
	 */
	private void initializeTypes() {
		typeNameToClass = new Hashtable(18);
		String dataDefs = "/org/apache/tools/ant/types/defaults.properties"; //$NON-NLS-1$
		try {
			Properties props = new Properties();
			InputStream in = Project.class.getResourceAsStream(dataDefs);
			if (in == null) {
				return;
			}
			props.load(in);
			in.close();

			Enumeration enum = props.propertyNames();
			while (enum.hasMoreElements()) {
				String typeName = (String) enum.nextElement();
				String className = props.getProperty(typeName);
				try {
					Class typeClass= Class.forName(className);
					typeNameToClass.put(typeName, typeClass);
				} catch (NoClassDefFoundError e) {
					throw new BuildException(InternalAntMessages.getString("InternalAntRunner.Missing_Class"), e); //$NON-NLS-1$
				} catch (ClassNotFoundException c) {
					throw new BuildException(InternalAntMessages.getString("InternalAntRunner.Missing_Class"), c); //$NON-NLS-1$
				}
				
			}
		} catch (IOException ioe) {
			return;
		}

	}
	
	/* (non-Javadoc)
	 * @see org.apache.tools.ant.Project#getDataTypeDefinitions()
	 */
	public Hashtable getDataTypeDefinitions() {
		if (typeNameToClass == null) {
			initializeTypes();
		}
		return typeNameToClass;
	}
}