/*
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2001 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.core.model;

import org.apache.ant.core.support.*;
import java.util.*;
import java.net.URL;

/**
 * A project is a collection of targets and global tasks. A project
 * may reference objects in other projects using named references of 
 * the form project:object
 *
 * @author <a href="mailto:conor@apache.org">Conor MacNeill</a>
 */ 
public class Project extends BuildElement {
    /** The default target in this project. */
    private String defaultTarget = null;

    /** The base URL of this project. Relative locations are relative to this base.*/
    private String base;
    
    /**
     * The name of this project when referenced by a script within this project. 
     */
    private String name;
    
    /**
     * These are the targets which belong to the project. They
     * will have interdependencies which are used to determine
     * which targets need to be executed before a given target.
     */
    private Map targets = new HashMap();
    
    /**
     * The global tasks for this project. These are the tasks that will get executed
     * whenever an execution context is associated with this project.
     */
    private List tasks = new ArrayList();
    
    /**
     * The projects imported into this project. Each imported project is
     * given a name which is used to identify access to that project's
     * elements.
     */
    private Map importedProjects = new HashMap(); 

    /**
     * The URL where the project is defined.
     * 
     */
    private URL sourceURL;

    /**
     * Create a Project
     *
     * @param sourceURL the URL where the project is defined.
     * @param location the location of this element within the source.
     */
    public Project(URL sourceURL, Location location) {
        super(location);
        this.sourceURL = sourceURL;
    }

    /**
     * Get the URL where this project is defined
     *
     * @return the project source URL
     */
    public URL getSourceURL() {
        return sourceURL;
    }
        
    /**
     * Add a target to the project.
     *
     * @param target the Target to be added
     * 
     * @throws ProjectModelException if a target with the same name already exists.
     */
    public void addTarget(Target target) throws ProjectModelException {
        if (targets.containsKey(target.getName())) {
            throw new ProjectModelException("A target with name '" + target.getName() +
                                            "' has already been defined in this project", 
                                            target.getLocation());
        }                                            
        targets.put(target.getName(), target);
    }
    
    /**
     * Set the defautl target of this project.
     *
     * @param defaultTarget the name of the defaultTarget of this project.
     */
    public void setDefaultTarget(String defaultTarget) {
        this.defaultTarget = defaultTarget;
    }
    
    /**
     * Get the Project's default Target, if any
     *
     * @return the project's defautl target or null if there is no default.
     */
    public String getDefaultTarget() {
        return defaultTarget;
    }

    /**
     * Set the base URL for this project.
     *
     * @param base the baseURL for this project.
     */
    public void setBase(String base) {
        this.base = base;
    }
        
    /**
     * Get the base URL for this project.
     *
     * @return the baseURL for this project as a string.
     */
    public String getBase() {
        return base;
    }
        
    /**
     * Set the name of this project.
     *
     * @param name the name for this project.
     */
    public void setName(String name) {
        this.name = name;
    }
        

    /**
     * Add a task to the list of global tasks for this project.
     *
     * @param task a task to be executed when an execution context
     * is associated with the Project (a non-target task)
     */
    public void addTask(TaskElement task) {
        tasks.add(task);
    }
    
    /**
     * Import a project to be referenced using the given name.
     *
     * @param importName the name under which the project will be referenced.
     * @param project the imported project.
     *
     * @throws ProjectModelException if an existing project has already 
     *                               been imported with that name.
     */
    public void importProject(String importName, Project project) 
            throws ProjectModelException {
        if (importedProjects.containsKey(importName)) {
            throw new ProjectModelException("A project has already been imported with name '" + 
                                            importName + "'");
        }
        importedProjects.put(importName, project);
    }
    
    /**
     * Get the targets in this project.
     *
     * @return an iterator returning Target objects.
     */
    public Iterator getTargets() {
        return targets.values().iterator();
    }
    
    /**
     * Get the target with the given name
     *
     * @param targetName the name of the desired target.
     *
     * @return the target with the given name or null if there is no
     *         such target.
     */
    public Target getTarget(String targetName) {
        return (Target)targets.get(targetName);
    }
    
    /**
     * Get the name sof the imported projects.
     *
     * @return an iterator which returns the name sof the imported projects.
     */
    public Iterator getImportedProjectNames() {
        return importedProjects.keySet().iterator();
    }
    
    /**
     * Get an imported project by name
     *
     * @param importName the name under which the project was imported.
     *
     * @return the project asscociated with the given import name or null 
     *         if there is no such project.
     */
    public Project getImportedProject(String importName) {
        return (Project)importedProjects.get(importName);
    }
    
    /**
     * Get the initialisation tasks for this project
     *
     * @return an iterator over the set of tasks for this project.
     */
    public Iterator getTasks() {
        return tasks.iterator();
    }
}