| /* |
| * Copyright 2009-2010 by The Regents of the University of California |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * you may obtain a copy of the License from |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package edu.uci.ics.pregelix.api.util; |
| |
| import java.io.ByteArrayInputStream; |
| import java.io.ByteArrayOutputStream; |
| import java.io.DataInput; |
| import java.io.DataInputStream; |
| import java.io.DataOutput; |
| import java.io.DataOutputStream; |
| import java.io.IOException; |
| |
| import org.apache.hadoop.io.Writable; |
| |
| public class SerDeUtils { |
| |
| public static byte[] serialize(Writable object) throws IOException { |
| ByteArrayOutputStream bbos = new ByteArrayOutputStream(); |
| DataOutput output = new DataOutputStream(bbos); |
| object.write(output); |
| return bbos.toByteArray(); |
| } |
| |
| public static void deserialize(Writable object, byte[] buffer) throws IOException { |
| ByteArrayInputStream bbis = new ByteArrayInputStream(buffer); |
| DataInput input = new DataInputStream(bbis); |
| object.readFields(input); |
| } |
| |
| public static long readVLong(DataInput in) throws IOException { |
| int vLen = 0; |
| long value = 0L; |
| while (true) { |
| byte b = (byte) in.readByte(); |
| ++vLen; |
| value += (((long) (b & 0x7f)) << ((vLen - 1) * 7)); |
| if ((b & 0x80) == 0) { |
| break; |
| } |
| } |
| return value; |
| } |
| |
| public static void writeVLong(DataOutput out, long value) throws IOException { |
| long data = value; |
| do { |
| byte b = (byte) (data & 0x7f); |
| data >>= 7; |
| if (data != 0) { |
| b |= 0x80; |
| } |
| out.write(b); |
| } while (data != 0); |
| } |
| |
| public static long readVLong(byte[] data, int start, int length) { |
| int vLen = 0; |
| long value = 0L; |
| while (true) { |
| byte b = (byte) data[start]; |
| ++vLen; |
| value += (((long) (b & 0x7f)) << ((vLen - 1) * 7)); |
| if ((b & 0x80) == 0) { |
| break; |
| } |
| ++start; |
| } |
| if (vLen != length) |
| throw new IllegalStateException("length mismatch -- vLen:" + vLen + " length:" + length); |
| return value; |
| } |
| |
| } |