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package org.glassfish.deployment.common;

import org.glassfish.api.deployment.DeploymentContext;

import org.glassfish.api.container.Container;
import org.glassfish.api.deployment.ApplicationContainer;
import org.glassfish.api.deployment.Deployer;
import org.glassfish.api.deployment.MetaData;
import org.glassfish.api.deployment.OpsParams;


/**
 * Convenient superclass for Deployers which only do prepare and 
 * clean up and do not actually load/unload application
 *
 */
public abstract class SimpleDeployer  implements Deployer {

    /**
     * Loads the meta date associated with the application.
     *
     * @parameters type type of metadata that this deployer has declared providing.
     */
    public  V loadMetaData(Class type, DeploymentContext context) {
        return null;
    }

    /**
     * Prepares the application bits for running in the application server.
     * For certain cases, this is generating non portable
     * artifacts and other application specific tasks.
     * Failure to prepare should throw an exception which will cause the overall
     * deployment to fail.
     *
     * @param dc deployment context
     * @return true if the prepare phase was successful
     *
     */
    public boolean prepare(DeploymentContext dc) {
        try {
            if (! dc.getCommandParameters(OpsParams.class).origin.isArtifactsPresent()) {
                // only generate artifacts when no artifacts are present
                generateArtifacts(dc);
            }
            return true;
        } catch (Exception ex) {
            // re-throw all the exceptions as runtime exceptions
            RuntimeException re = new RuntimeException(ex.getMessage());
            re.initCause(ex);
            throw re;
        }
    }

    /**
     * No-op 
     */
    public U load(T container, DeploymentContext context) {
        return null;
    }

    /**
     * No-op
     */
    public void unload(U appContainer, DeploymentContext context) {
    }

    /**
     * Clean any files and artifacts that were created during the execution
     * of the prepare method.
     *
     * @param context deployment context
     */
    public void clean(DeploymentContext context) {
        try {
            if (context.getCommandParameters(
                OpsParams.class).origin.needsCleanArtifacts()) {
                // only clean artifacts when needed
                cleanArtifacts(context);
            }
        } catch (Exception ex) {
            // re-throw all the exceptions as runtime exceptions
            RuntimeException re = new RuntimeException(ex.getMessage());
            re.initCause(ex);
            throw re;
        }
    }

    /**
     * Returns the meta data assocated with this Deployer
     *
     * @return the meta data for this Deployer
     */
    public MetaData getMetaData() {
        return new MetaData(false, null, null);
    }

    // methods for implementation clsses to override
    abstract protected void generateArtifacts(DeploymentContext dc) 
        throws DeploymentException;
    abstract protected void cleanArtifacts(DeploymentContext dc)
        throws DeploymentException;

}