/**

 * Copyright (c) 2010 Symbian Foundation and/or its subsidiary(-ies).

 * All rights reserved.

 * This component and the accompanying materials are made available

 * under the terms of the License "Eclipse Public License v1.0"

 * which accompanies this distribution, and is available

 * at the URL "http://www.eclipse.org/legal/epl-v10.html".

 *

 * Initial Contributors:

 * Symbian Foundation - initial contribution.

 * Contributors:

 * Description:

 * Overview:

 * Details:

 * Platforms/Drives/Compatibility:

 * Assumptions/Requirement/Pre-requisites:

 * Failures and causes:

 */

package org.symbian.tools.tmw.internal.ui.project;

import org.eclipse.core.resources.IProject;

import org.eclipse.core.runtime.CoreException;

import org.eclipse.core.runtime.IConfigurationElement;

import org.eclipse.core.runtime.IPath;

import org.eclipse.core.runtime.IProgressMonitor;

import org.symbian.tools.tmw.ui.TMWCoreUI;

import org.symbian.tools.tmw.ui.project.IProjectTemplateContext;

import org.symbian.tools.tmw.ui.project.ITemplateInstaller;

public final class LazyInstaller implements ITemplateInstaller {

    private final class NullInstaller implements ITemplateInstaller {

        public void cleanup() {

            // Do nothing

        }

        public void copyFiles(IPath[] files, IProgressMonitor monitor) {

            // Do nothing

        }

        public IPath[] getFiles() throws CoreException {

            return new IPath[0];

        }

        public void prepare(IProject project, IProjectTemplateContext context) {

            // Do nothing

        }

    }

    private final IConfigurationElement element;

    private ITemplateInstaller installer;

    public LazyInstaller(IConfigurationElement element) {

        this.element = element;

    }

    public void cleanup() {

        getInstaller().cleanup();

    }

    public void copyFiles(IPath[] files, IProgressMonitor monitor) throws CoreException {

        getInstaller().copyFiles(files, monitor);

    }

    public IPath[] getFiles() throws CoreException {

        return getInstaller().getFiles();

    }

    private ITemplateInstaller getInstaller() {

        if (installer == null) {

            try {

                installer = (ITemplateInstaller) element.createExecutableExtension("class");

            } catch (CoreException e) {

                TMWCoreUI.log(e);

                installer = new NullInstaller();

            }

        }

        return installer;

    }

    public void prepare(IProject project, IProjectTemplateContext context) {

        getInstaller().prepare(project, context);

    }

}