/*
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 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.ant.antcore.execution;
import java.io.File;
import java.net.MalformedURLException;
import java.util.List;
import java.util.Map;
import org.apache.ant.antcore.modelparser.XMLProjectParser;
import org.apache.ant.antcore.xml.XMLParseException;
import org.apache.ant.common.antlib.AntContext;
import org.apache.ant.common.antlib.Task;
import org.apache.ant.common.model.Project;
import org.apache.ant.common.service.ExecService;
import org.apache.ant.common.util.ExecutionException;
import org.apache.ant.init.InitUtils;
import org.apache.ant.init.LoaderUtils;

/**
 * This is the core's implementation of the Execution Service.
 *
 * @author Conor MacNeill
 * @created 8 February 2002
 */
public class CoreExecService implements ExecService {
    /** The Frame this service instance is working for */
    private Frame frame;

    /**
     * Constructor
     *
     * @param frame the frame containing this context
     */
    protected CoreExecService(Frame frame) {
        this.frame = frame;
    }

    /**
     * Run a sub-build.
     *
     * @param antFile the file containing the XML description of the model
     * @param targets A list of targets to be run
     * @param properties the initiali properties to be used in the build
     * @exception ExecutionException if the subbuild cannot be run
     */
    public void runBuild(File antFile, Map properties, List targets)
         throws ExecutionException {
        try {
            // Parse the build file into a project
            XMLProjectParser parser = new XMLProjectParser();
            Project project
                 = parser.parseBuildFile(InitUtils.getFileURL(antFile));
            runBuild(project, properties, targets);
        } catch (MalformedURLException e) {
            throw new ExecutionException(e);
        } catch (XMLParseException e) {
            throw new ExecutionException(e);
        }
    }

    /**
     * Run a sub-build.
     *
     * @param model the project model to be used for the build
     * @param targets A list of targets to be run
     * @param properties the initiali properties to be used in the build
     * @exception ExecutionException if the subbuild cannot be run
     */
    public void runBuild(Project model, Map properties, List targets)
         throws ExecutionException {
        Frame newFrame = frame.createFrame(model);
        newFrame.setInitialProperties(properties);
        newFrame.runBuild(targets);
    }

    /**
     * Run a sub-build using the current frame's project model
     *
     * @param targets A list of targets to be run
     * @param properties the initiali properties to be used in the build
     * @exception ExecutionException if the subbuild cannot be run
     */
    public void callTarget(Map properties, List targets)
         throws ExecutionException {
        runBuild(frame.getProject(), properties, targets);
    }

    /**
     * Execute a task. The task should have already been initialised by
     * the core. This is checked
     *
     * @param task the task to be executed
     * @exception ExecutionException if there is an execution problem
     */
    public void executeTask(Task task) throws ExecutionException {
        AntContext context = task.getAntContext();
        if (!(context instanceof ExecutionContext)) {
            throw new ExecutionException("The Task was not configured with an"
                 + " appropriate context");
        }
        ExecutionContext execContext = (ExecutionContext)context;
        
        frame.getEventSupport().fireTaskStarted(task);
        Throwable failureCause = null;
        try {
            ClassLoader currentLoader 
                = LoaderUtils.setContextLoader(execContext.getClassLoader());
            task.execute();
            LoaderUtils.setContextLoader(currentLoader);
        } catch (Throwable e) {
            ExecutionException ee =
                new ExecutionException(e.getClass().getName() + ": "
                 + e.getMessage(), e);
            failureCause = ee;
            throw ee;
        } finally {
            frame.getEventSupport().fireTaskFinished(task, failureCause);
        }
    }
}

