/* Copyright (C) 2004 - 2008  Versant Inc.  http://www.db4o.com

This file is part of the sharpen open source java to c# translator.

sharpen is free software; you can redistribute it and/or modify it under
the terms of version 2 of the GNU General Public License as published
by the Free Software Foundation and as clarified by db4objects' GPL 
interpretation policy, available at
http://www.db4o.com/about/company/legalpolicies/gplinterpretation/
Alternatively you can write to db4objects, Inc., 1900 S Norfolk Street,
Suite 350, San Mateo, CA 94403, USA.

sharpen is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
for more details.

You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
59 Temple Place - Suite 330, Boston, MA  02111-1307, USA. */

package sharpen.xobotos.builder;

import org.eclipse.core.resources.ICommand;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IProjectDescription;
import org.eclipse.core.resources.IProjectNature;
import org.eclipse.core.runtime.CoreException;

import sharpen.xobotos.Activator;

public class SharpenNature implements IProjectNature {

	/**
	 * ID of this project nature
	 */
	public static final String NATURE_ID = Activator.PLUGIN_ID + ".sharpenNature";

	private IProject _project;

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.core.resources.IProjectNature#configure()
	 */
	public void configure() throws CoreException {
		IProjectDescription desc = _project.getDescription();
		ICommand[] commands = desc.getBuildSpec();

		if (containsBuilderCommand(commands)) return;

		desc.setBuildSpec(append(commands, newBuilderCommand(desc)));
		_project.setDescription(desc, null);
	}

	private boolean containsBuilderCommand(ICommand[] commands) {
		for (int i = 0; i < commands.length; ++i) {
			if (commands[i].getBuilderName().equals(SharpenBuilder.BUILDER_ID)) {
				return true;
			}
		}
		return false;
	}

	private ICommand newBuilderCommand(IProjectDescription desc) {
		ICommand command = desc.newCommand();
		command.setBuilderName(SharpenBuilder.BUILDER_ID);
		return command;
	}

	private ICommand[] append(ICommand[] commands, ICommand command) {
		ICommand[] newCommands = new ICommand[commands.length + 1];
		System.arraycopy(commands, 0, newCommands, 0, commands.length);		
		newCommands[newCommands.length - 1] = command;
		return newCommands;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.core.resources.IProjectNature#deconfigure()
	 */
	public void deconfigure() throws CoreException {
		IProjectDescription description = getProject().getDescription();
		ICommand[] commands = description.getBuildSpec();
		for (int i = 0; i < commands.length; ++i) {
			if (commands[i].getBuilderName().equals(SharpenBuilder.BUILDER_ID)) {
				ICommand[] newCommands = new ICommand[commands.length - 1];
				System.arraycopy(commands, 0, newCommands, 0, i);
				System.arraycopy(commands, i + 1, newCommands, i,
						commands.length - i - 1);
				description.setBuildSpec(newCommands);
				return;
			}
		}
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.core.resources.IProjectNature#getProject()
	 */
	public IProject getProject() {
		return _project;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.core.resources.IProjectNature#setProject(org.eclipse.core.resources.IProject)
	 */
	public void setProject(IProject project) {
		this._project = project;
	}

}