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/*******************************************************************************
 *
 * Copyright (c) 2004-2009 Oracle Corporation.
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors: 
*
*    Tom Huybrechts
 *     
 *
 *******************************************************************************/ 

package hudson.slaves;

import hudson.ExtensionPoint;
import hudson.Launcher;
import hudson.DescriptorExtensionList;
import hudson.model.queue.CauseOfBlockage;
import hudson.scm.SCM;
import hudson.model.AbstractBuild;
import hudson.model.BuildListener;
import hudson.model.Describable;
import hudson.model.Environment;
import hudson.model.Hudson;
import hudson.model.Node;
import hudson.model.Queue.Task;

import java.io.IOException;
import java.util.List;

/**
 * Extensible property of {@link Node}.
 *
 * 
 * Plugins can contribute this extension point to add additional data or UI actions to {@link Node}.
 * {@link NodeProperty}s show up in the configuration screen of a node, and they are persisted with the {@link Node} object.
 *
 *
 * 
Views
 * 
 * config.jelly
 * Added to the configuration page of the node.
 * 
global.jelly
 * Added to the system configuration page.
 * 
summary.jelly (optional)
 * Added to the index page of the {@link hudson.model.Computer} associated with the node
 * 
 *
 * @param 
 *      {@link NodeProperty} can choose to only work with a certain subtype of {@link Node}, and this 'N'
 *      represents that type. Also see {@link NodePropertyDescriptor#isApplicable(Class)}.
 *
 * @since 1.286
 */
public abstract class NodeProperty implements Describable>, ExtensionPoint {

    protected transient N node;

    protected void setNode(N node) { this.node = node; }

    public NodePropertyDescriptor getDescriptor() {
        return (NodePropertyDescriptor)Hudson.getInstance().getDescriptorOrDie(getClass());
    }

    /**
     * Called by the {@link Node} to help determine whether or not it should
     * take the given task. Individual properties can return a non-null value
     * here if there is some reason the given task should not be run on its
     * associated node. By default, this method returns null.
     *
     * @since 1.360
     */
    public CauseOfBlockage canTake(Task task) {
        return null;
    }

    /**
     * Runs before the {@link SCM#checkout(AbstractBuild, Launcher, FilePath, BuildListener, File)} runs, and performs a set up.
     * Can contribute additional properties to the environment.
     * 
     * @param build
     *      The build in progress for which an {@link Environment} object is created.
     *      Never null.
     * @param launcher
     *      This launcher can be used to launch processes for this build.
     *      If the build runs remotely, launcher will also run a job on that remote machine.
     *      Never null.
     * @param listener
     *      Can be used to send any message.
     * @return
     *      non-null if the build can continue, null if there was an error
     *      and the build needs to be aborted.
     * @throws IOException
     *      terminates the build abnormally. Hudson will handle the exception
     *      and reports a nice error message.
     */
    public Environment setUp( AbstractBuild build, Launcher launcher, BuildListener listener ) throws IOException, InterruptedException {
    	return new Environment() {};
    }

    /**
     * Lists up all the registered {@link NodeDescriptor}s in the system.
     */
    public static DescriptorExtensionList,NodePropertyDescriptor> all() {
        return (DescriptorExtensionList)Hudson.getInstance().getDescriptorList(NodeProperty.class);
    }

    /**
     * List up all {@link NodePropertyDescriptor}s that are applicable for the
     * given project.
     */
    public static List for_(Node node) {
        return NodePropertyDescriptor.for_(all(),node);
    }
}