/*******************************************************************************
 * Copyright (c) 2006, 2009 Oracle. 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:
 *     Oracle - initial API and implementation
 ******************************************************************************/
package org.eclipse.jpt.core.internal.facet;

import org.eclipse.core.resources.IProject;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.jdt.core.IClasspathContainer;
import org.eclipse.jdt.core.IClasspathEntry;
import org.eclipse.jdt.core.IJavaProject;
import org.eclipse.jdt.core.JavaCore;
import org.eclipse.jpt.db.JptDbPlugin;
import org.eclipse.jpt.utility.internal.ArrayTools;
import org.eclipse.wst.common.frameworks.datamodel.IDataModel;
import org.eclipse.wst.common.project.facet.core.IProjectFacetVersion;

/**
 * We don't really "install" the JPA facet here. We simply store all the various
 * data model properties in the appropriate preferences. These settings will
 * used in the POST_INSTALL event listener to build the JPA project.
 */
public class JpaFacetInstallDelegate 
	extends JpaFacetActionDelegate
	implements JpaFacetInstallDataModelProperties
{
	@Override
	protected void execute_(
			IProject project, @SuppressWarnings("unused") IProjectFacetVersion fv, 
			Object config, IProgressMonitor monitor) throws CoreException {
		
		// NB: WTP Natures (including the JavaEMFNature)
		// should already be added, as this facet should 
		// always coexist with a module facet.
		
		super.execute_(project, fv, config, monitor);
		
		IJavaProject javaProject = JavaCore.create(project);
		IDataModel dataModel = (IDataModel) config;
		
		monitor.beginTask("", 1); //$NON-NLS-1$
		
		// project settings
		this.addDbDriverLibraryToClasspath(javaProject, dataModel, monitor);
		
		monitor.worked(1);
	}
	
	protected void addDbDriverLibraryToClasspath(
			IJavaProject javaProject, IDataModel dataModel, 
			IProgressMonitor monitor) throws CoreException {
		
		if( ! dataModel.getBooleanProperty(USER_WANTS_TO_ADD_DB_DRIVER_JARS_TO_CLASSPATH)) {
			return;
		}
		String driverName = dataModel.getStringProperty(DB_DRIVER_NAME);
		
		IClasspathContainer container = JptDbPlugin.instance().buildDriverClasspathContainerFor(driverName);
		IClasspathEntry entry = JavaCore.newContainerEntry(container.getPath());
		this.addClasspathEntryToProject(entry, javaProject, monitor);
	}
	
	private void addClasspathEntryToProject(
			IClasspathEntry classpathEntry, IJavaProject javaProject, IProgressMonitor monitor) 
			throws CoreException {
		
		// if the classpathEntry is already there, do nothing
		IClasspathEntry[] classpath = javaProject.getRawClasspath();
		if (ArrayTools.contains(classpath, classpathEntry)) {
			return;
		}
		
		// add the given classpathEntry to the project classpath
		int len = classpath.length;
		IClasspathEntry[] newClasspath = new IClasspathEntry[len + 1];
		System.arraycopy(classpath, 0, newClasspath, 0, len);
		newClasspath[len] = classpathEntry;
		javaProject.setRawClasspath(newClasspath, monitor);
	}
}