/*******************************************************************************
 * Copyright (c) 2000, 2003 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials 
 * are made available under the terms of the Common Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/cpl-v10.html
 * 
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package net.sourceforge.phpdt.ui;

import net.sourceforge.phpdt.core.ICompilationUnit;

import org.eclipse.core.runtime.CoreException;
import org.eclipse.ui.IEditorInput;

/**
 * Interface for accessing working copies of <code>ICompilationUnit</code>
 * objects. The original compilation unit is only given indirectly by means of
 * an <code>IEditorInput</code>. The life cycle is as follows:
 * <ul>
 * <li> <code>connect</code> creates and remembers a working copy of the
 * compilation unit which is encoded in the given editor input</li>
 * <li> <code>getWorkingCopy</code> returns the working copy remembered on
 * <code>connect</code></li>
 * <li> <code>disconnect</code> destroys the working copy remembered on
 * <code>connect</code></li>
 * </ul>
 * <p>
 * This interface is not intended to be implemented by clients.
 * </p>
 * 
 * @see JavaUI#getWorkingCopyManager
 */
public interface IWorkingCopyManager {

	/**
	 * Connects the given editor input to this manager. After calling this
	 * method, a working copy will be available for the compilation unit encoded
	 * in the given editor input (does nothing if there is no encoded
	 * compilation unit).
	 * 
	 * @param input
	 *            the editor input
	 * @exception CoreException
	 *                if the working copy cannot be created for the compilation
	 *                unit
	 */
	void connect(IEditorInput input) throws CoreException;

	/**
	 * Disconnects the given editor input from this manager. After calling this
	 * method, a working copy for the compilation unit encoded in the given
	 * editor input will no longer be available. Does nothing if there is no
	 * encoded compilation unit, or if there is no remembered working copy for
	 * the compilation unit.
	 * 
	 * @param input
	 *            the editor input
	 */
	void disconnect(IEditorInput input);

	/**
	 * Returns the working copy remembered for the compilation unit encoded in
	 * the given editor input.
	 * 
	 * @param input
	 *            the editor input
	 * @return the working copy of the compilation unit, or <code>null</code>
	 *         if the input does not encode an editor input, or if there is no
	 *         remembered working copy for this compilation unit
	 */
	ICompilationUnit getWorkingCopy(IEditorInput input);

	/**
	 * Shuts down this working copy manager. All working copies still remembered
	 * by this manager are destroyed.
	 */
	void shutdown();
}
