Copyright (c) 2000, 2015 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
    James Blackburn (Broadcom Corp.) - ongoing development
    Lars Vogel  - Bug 473427
/*******************************************************************************
 * Copyright (c) 2000, 2015 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
 *     James Blackburn (Broadcom Corp.) - ongoing development
 *     Lars Vogel <Lars.Vogel@vogella.com> - Bug 473427
 *******************************************************************************/
package org.eclipse.core.internal.resources;

import java.io.*;
import java.util.ArrayList;
import java.util.List;
import org.eclipse.core.internal.utils.Messages;
import org.eclipse.core.internal.utils.ObjectMap;
import org.eclipse.core.resources.IResourceStatus;
import org.eclipse.core.runtime.*;
import org.eclipse.osgi.util.NLS;

This class is used to read sync info from disk. This is the implementation
for reading files with version number 3.
/**
 * This class is used to read sync info from disk. This is the implementation
 * for reading files with version number 3.
 */
public class SyncInfoReader_3 extends SyncInfoReader {

	// for sync info
	public static final byte INDEX = 1;
	public static final byte QNAME = 2;

	public SyncInfoReader_3(Workspace workspace, Synchronizer synchronizer) {
		super(workspace, synchronizer);
	}

	
 
SAVE_FILE -> VERSION_ID RESOURCE+
VERSION_ID -> int
RESOURCE -> RESOURCE_PATH SIZE SYNCINFO*
RESOURCE_PATH -> String
SIZE -> int
SYNCINFO -> TYPE BYTES
TYPE -> INDEX | QNAME
INDEX -> byte int
QNAME -> byte String
BYTES -> byte[]

/**
	 * <pre> {@code
	 * SAVE_FILE -> VERSION_ID RESOURCE+
	 * VERSION_ID -> int
	 * RESOURCE -> RESOURCE_PATH SIZE SYNCINFO*
	 * RESOURCE_PATH -> String
	 * SIZE -> int
	 * SYNCINFO -> TYPE BYTES
	 * TYPE -> INDEX | QNAME
	 * INDEX -> byte int
	 * QNAME -> byte String
	 * BYTES -> byte[]
	 * }</pre>
	 */
	@Override
	public void readSyncInfo(DataInputStream input) throws IOException, CoreException {
		try {
			List<QualifiedName> readPartners = new ArrayList<>(5);
			while (true) {
				IPath path = new Path(input.readUTF());
				readSyncInfo(path, input, readPartners);
			}
		} catch (EOFException e) {
			// ignore end of file
		}
	}

	private void readSyncInfo(IPath path, DataInputStream input, List<QualifiedName> readPartners) throws IOException, CoreException {
		int size = input.readInt();
		ObjectMap<QualifiedName, Object> table = new ObjectMap<>(size);
		for (int i = 0; i < size; i++) {
			QualifiedName name = null;
			byte type = input.readByte();
			switch (type) {
				case QNAME :
					String qualifier = input.readUTF();
					String local = input.readUTF();
					name = new QualifiedName(qualifier, local);
					readPartners.add(name);
					break;
				case INDEX :
					name = readPartners.get(input.readInt());
					break;
				default :
					//if we get here then the sync info file is corrupt
					String msg = NLS.bind(Messages.resources_readSync, path == null ? "" : path.toString()); //$NON-NLS-1$
					throw new ResourceException(IResourceStatus.FAILED_READ_METADATA, path, msg, null);
			}
			// read the bytes
			int length = input.readInt();
			byte[] bytes = new byte[length];
			input.readFully(bytes);
			// put them in the table
			table.put(name, bytes);
		}
		// set the table on the resource info
		ResourceInfo info = workspace.getResourceInfo(path, true, false);
		if (info == null)
			return;
		info.setSyncInfo(table);
		info.clear(ICoreConstants.M_SYNCINFO_SNAP_DIRTY);
	}
}