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/*******************************************************************************
* 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 org.eclipse.team.internal.core.subscribers;
import java.util.ArrayList;
import java.util.List;
import org.eclipse.team.core.TeamException;
import org.eclipse.team.internal.core.Policy;
/**
* Utility for managing slash separated sync information fields.
*/
public class SyncByteConverter {
protected static final byte SEPARATOR_BYTE = (byte)'/';
public static String[] parseIntoSubstrings(String string, String delimiter) {
List result = new ArrayList();
int start = 0;
int index = string.indexOf(delimiter);
String next;
while (index != -1) {
next = string.substring(start, index);
result.add(next);
start = index + 1;
index = string.indexOf(delimiter, start);
}
if (start >= string.length()) {
next = "";//$NON-NLS-1$
} else {
next = string.substring(start);
}
result.add(next);
return (String[]) result.toArray(new String[result.size()]);
}
/**
* Method setSlot.
* @param syncBytes
* @param i
* @param b
* @return byte[]
*/
public static byte[] setSlot(byte[] syncBytes, int slot, byte[] newBytes) throws TeamException {
int start = startOfSlot(syncBytes, slot);
if (start == -1) {
throw new TeamException(Policy.bind("SyncByteConverter.1", new String(syncBytes))); //$NON-NLS-1$
}
int end = startOfSlot(syncBytes, slot + 1);
int totalLength = start + 1 + newBytes.length;
if (end != -1) {
totalLength += syncBytes.length - end;
}
byte[] result = new byte[totalLength];
System.arraycopy(syncBytes, 0, result, 0, start + 1);
System.arraycopy(newBytes, 0, result, start + 1, newBytes.length);
if (end != -1) {
System.arraycopy(syncBytes, end, result, start + 1 + newBytes.length, syncBytes.length - end);
}
return result;
}
/**
* Method startOfSlot returns the index of the slash that occurs before the
* given slot index. The provided index should be >= 1 which assumes that
* slot zero occurs before the first slash.
*
* @param syncBytes
* @param i
* @return int
*/
private static int startOfSlot(byte[] syncBytes, int slot) {
int count = 0;
for (int j = 0; j < syncBytes.length; j++) {
if (syncBytes[j] == SEPARATOR_BYTE) {
count++;
if (count == slot) return j;
}
}
return -1;
}
/**
* Return the offset the the Nth delimeter from the given start index.
* @param bytes
* @param delimiter
* @param start
* @param n
* @return int
*/
private static int getOffsetOfDelimeter(byte[] bytes, byte delimiter, int start, int n) {
int count = 0;
for (int i = start; i < bytes.length; i++) {
if (bytes[i] == delimiter) count++;
if (count == n) return i;
}
// the Nth delimeter was not found
return -1;
}
/**
* Method getBytesForSlot.
* @param syncBytes
* @param SEPARATOR_BYTE
* @param i
* @param b
* @return byte[]
*/
public static byte[] getSlot(byte[] bytes, int index, boolean includeRest) {
// Find the starting index
byte delimiter = SEPARATOR_BYTE;
int start;
if (index == 0) {
// make start -1 so that end determination will start at offset 0.
start = -1;
} else {
start = getOffsetOfDelimeter(bytes, delimiter, 0, index);
if (start == -1) return null;
}
// Find the ending index
int end = getOffsetOfDelimeter(bytes, delimiter, start + 1, 1);
// Calculate the length
int length;
if (end == -1 || includeRest) {
length = bytes.length - start - 1;
} else {
length = end - start - 1;
}
byte[] result = new byte[length];
System.arraycopy(bytes, start + 1, result, 0, length);
return result;
}
public static byte[] toBytes(String[] slots) {
StringBuffer buffer = new StringBuffer();
for (int i = 0; i < slots.length; i++) {
String string = slots[i];
buffer.append(string);
buffer.append(new String(new byte[] {SyncByteConverter.SEPARATOR_BYTE }));
}
return buffer.toString().getBytes();
}
}
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