Copyright (c) 2000, 2013 IBM Corporation and others.
This program and the accompanying materials
are made available under the terms of the Eclipse Public License 2.0
which accompanies this distribution, and is available at
https://www.eclipse.org/legal/epl-2.0/
SPDX-License-Identifier: EPL-2.0
Contributors:
    IBM Corporation - initial API and implementation
    Stephan Herrmann  - inconsistent initialization of classpath container backed by external class folder, see https://bugs.eclipse.org/320618
/*******************************************************************************
 * Copyright (c) 2000, 2013 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *     Stephan Herrmann <stephan@cs.tu-berlin.de> - inconsistent initialization of classpath container backed by external class folder, see https://bugs.eclipse.org/320618
 *******************************************************************************/
package org.eclipse.jdt.internal.core;

import java.util.Iterator;
import java.util.Set;

import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.jdt.core.IClasspathEntry;
import org.eclipse.jdt.core.JavaModelException;

@SuppressWarnings("rawtypes")
public class ExternalFolderChange {

	private JavaProject project;
	private IClasspathEntry[] oldResolvedClasspath;

	public ExternalFolderChange(JavaProject project, IClasspathEntry[] oldResolvedClasspath) {
		this.project = project;
		this.oldResolvedClasspath = oldResolvedClasspath;
	}

	/*
	 * Update external folders
	 */
	public void updateExternalFoldersIfNecessary(boolean refreshIfExistAlready, IProgressMonitor monitor) throws JavaModelException {
		Set oldFolders = ExternalFoldersManager.getExternalFolders(this.oldResolvedClasspath);
		IClasspathEntry[] newResolvedClasspath = this.project.getResolvedClasspath();
		Set newFolders = ExternalFoldersManager.getExternalFolders(newResolvedClasspath);
		if (newFolders == null)
			return;
		ExternalFoldersManager foldersManager = JavaModelManager.getExternalManager();
		Iterator iterator = newFolders.iterator();
		while (iterator.hasNext()) {
			Object folderPath = iterator.next();
			if (oldFolders == null || !oldFolders.remove(folderPath) || foldersManager.removePendingFolder(folderPath)) {
				try {
					foldersManager.createLinkFolder((IPath) folderPath, refreshIfExistAlready, monitor);
				} catch (CoreException e) {
					throw new JavaModelException(e);
				}
			}
		}
		// removal of linked folders is done during save
	}
	@Override
	public String toString() {
		return "ExternalFolderChange: " + this.project.getElementName(); //$NON-NLS-1$
	}
}