/*
 * 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
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 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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 * 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.j2ee;

import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.taskdefs.Java;

/**
 *  An Ant wrapper task for the weblogic.deploy tool.  This is used to
 *  hot-deploy J2EE applications to a running WebLogic server.
 *  This is <b>not</b> the same as creating the application archive.
 *  This task assumes the archive (EAR, JAR, or WAR) file has been
 *  assembled and is supplied as the "source" attribute.
 *  <p>In the end, this task assembles the commadline parameters
 *  and runs the weblogic.deploy tool in a seperate JVM.
 *
 *  @author Christopher A. Longo - cal@cloud9.net
 *
 *  @see org.apache.tools.ant.taskdefs.optional.j2ee.HotDeploymentTool
 *  @see org.apache.tools.ant.taskdefs.optional.j2ee.AbstractHotDeploymentTool
 *  @see org.apache.tools.ant.taskdefs.optional.j2ee.ServerDeploy
 */
public class WebLogicHotDeploymentTool extends AbstractHotDeploymentTool implements HotDeploymentTool
{
    /** The classname of the tool to run **/
    private static final String WEBLOGIC_DEPLOY_CLASS_NAME = "weblogic.deploy";

    /** All the valid actions that weblogic.deploy permits **/
    private static final String[] VALID_ACTIONS =
            {ACTION_DELETE, ACTION_DEPLOY, ACTION_LIST, ACTION_UNDEPLOY, ACTION_UPDATE};

    /** Represents the "-debug" flag from weblogic.deploy **/
    private boolean debug;

    /** The application name that is being deployed **/
    private String application;

    /** The component name:target(s) for the "-component" argument of weblogic.deploy **/
    private String component;

    /**
     *  Perform the actual deployment.
     *  For this implementation, a JVM is spawned and the weblogic.deploy
     *  tools is executed.
     *  @exception org.apache.tools.ant.BuildException if the attributes are invalid or incomplete.
     */
    public void deploy() {
        Java java = (Java) getTask().getProject().createTask("java");
        java.setFork(true);
        java.setFailonerror(true);
        java.setClasspath(getClasspath());

        java.setClassname(WEBLOGIC_DEPLOY_CLASS_NAME);
        java.createArg().setLine(getArguments());
        java.execute();
    }

    /**
     *  Validates the passed in attributes.
     *  <p>The rules are:
     *  <ol><li>If action is "deploy" or "update" the "application" and "source"
     *  attributes must be supplied.
     *  <li>If action is "delete" or "undeploy" the "application" attribute must
     *  be supplied.
     *  @exception org.apache.tools.ant.BuildException if the attributes are invalid or incomplete
     */
    public void validateAttributes() throws BuildException {
        super.validateAttributes();

        String action = getTask().getAction();

        // check that the password has been set
        if ((getPassword() == null))
            throw new BuildException("The password attribute must be set.");

        // check for missing application on deploy & update
        if ((action.equals(ACTION_DEPLOY) || action.equals(ACTION_UPDATE)) 
            && application == null)
            throw new BuildException("The application attribute must be set " 
                + "if action = " + action);

        // check for missing source on deploy & update
        if ((action.equals(ACTION_DEPLOY) || action.equals(ACTION_UPDATE)) 
            && getTask().getSource() == null)
            throw new BuildException("The source attribute must be set if " 
                + "action = " + action);

        // check for missing application on delete & undeploy
        if ((action.equals(ACTION_DELETE) || action.equals(ACTION_UNDEPLOY)) 
            && application == null)
            throw new BuildException("The application attribute must be set if " 
                + "action = " + action);
    }

    /**
     *  Builds the arguments to pass to weblogic.deploy according to the
     *  supplied action.
     *  @return A String containing the arguments for the weblogic.deploy tool.
     */
    public String getArguments() throws BuildException {
        String action = getTask().getAction();
        String args = null;

        if (action.equals(ACTION_DEPLOY) || action.equals(ACTION_UPDATE))
            args = buildDeployArgs();
        else if (action.equals(ACTION_DELETE) || action.equals(ACTION_UNDEPLOY))
            args = buildUndeployArgs();
        else if (action.equals(ACTION_LIST))
            args = buildListArgs();

        return args;
    }

    /**
     *  Determines if the action supplied is valid.
     *  <p>Valid actions are contained in the static array VALID_ACTIONS
     *  @return true if the action attribute is valid, false if not.
     */
    protected boolean isActionValid() {
        boolean valid = false;

        String action = getTask().getAction();

        for (int i = 0; i < VALID_ACTIONS.length; i++) {
            if (action.equals(VALID_ACTIONS[i])) {
                valid = true;
                break;
            }
        }

        return valid;
    }

    /**
     *  Builds the prefix arguments to pass to weblogic.deploy.
     *  These arguments are generic across all actions.
     *  @return A StringBuffer containing the prefix arguments.
     *  The action-specific build methods will append to this StringBuffer.
     */
    protected StringBuffer buildArgsPrefix() {
        ServerDeploy task = getTask();
        // constructs the "-url <url> -debug <action> <password>" portion
        // of the commmand line
        return new StringBuffer(1024)
                .append((getServer() != null)
                    ? "-url " + getServer()
                    : "")
                .append(" ")
                .append(debug ? "-debug " : "")
                .append((getUserName() != null)
                    ? "-username " + getUserName()
                    : "")
                .append(" ")
                .append(task.getAction()).append(" ")
                .append(getPassword()).append(" ");
    }

    /**
     *  Builds the arguments to pass to weblogic.deploy for deployment actions
     *  ("deploy" and "update").
     *  @return A String containing the full argument string for weblogic.deploy.
     */
    protected String buildDeployArgs() {
        String args = buildArgsPrefix()
                .append(application).append(" ")
                .append(getTask().getSource())
                .toString();

        if (component != null) {
            args = "-component " + component + " " + args;
        }
        
        return args;
    }

    /**
     *  Builds the arguments to pass to weblogic.deploy for undeployment actions
     *  ("undeploy" and "delete").
     *  @return A String containing the full argument string for weblogic.deploy.
     */
    protected String buildUndeployArgs() {
        return buildArgsPrefix()
                .append(application).append(" ")
                .toString();
    }

    /**
     *  Builds the arguments to pass to weblogic.deploy for the list action
     *  @return A String containing the full argument string for weblogic.deploy.
     */
    protected String buildListArgs() {
        return buildArgsPrefix()
                .toString();
    }

    /**
     *  Sets the debug field.
     *  <p>This is not a required attribute.
     *  @param debug A boolean representing weblogic.deploy "-debug" flag.
     */
    public void setDebug(boolean debug) {
        this.debug = debug;
    }

    /**
     *  Sets the application field.
     *  <p>This is a required attribute.
     *  @param application A String representing the application portion of the
     *  weblogic.deploy command line.
     */
    public void setApplication(String application) {
        this.application = application;
    }

    /**
     *  Sets the component attribute.
     *  <p>This attribute is not a required attribute.
     *  @param component A String representing the value of the "-component"
     *  argument of the weblogic.deploy command line argument.<br>
     *  This string should be in the format of
     *  &lt;<i>componentName</i>&gt;:&lt<i>target1</i>&gt;,&lt<i>target2</i>&gt;...
     */
    public void setComponent(String component) {
        this.component = component;
    }
}