| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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 at |
| * |
| * 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 org.apache.eagle.log.entity.meta; |
| |
| import java.io.UnsupportedEncodingException; |
| |
| import org.apache.eagle.common.ByteUtil; |
| |
| /** |
| * String array entity serializer and deserializer |
| * |
| */ |
| public class StringArraySerDeser implements EntitySerDeser<String[]> { |
| |
| public static final int MAX_STRING_LENGTH = 65535; |
| public static final String UTF_8 = "UTF-8"; |
| |
| @Override |
| public String[] deserialize(byte[] bytes) { |
| if(bytes == null || bytes.length < 4) |
| return null; |
| int offset = 0; |
| // get size of int array |
| final int size = ByteUtil.bytesToInt(bytes, offset); |
| offset += 4; |
| final String[] strings = new String[size]; |
| try { |
| for(int i = 0; i < size; i++) { |
| final int len = ByteUtil.bytesToInt(bytes, offset); |
| offset += 4; |
| strings[i] = new String(bytes, offset, len, UTF_8); |
| offset += len; |
| } |
| } catch (UnsupportedEncodingException e) { |
| throw new IllegalArgumentException("Invalid byte array"); |
| } |
| return strings; |
| } |
| |
| /** |
| * size + str1 length + str1 + str2 length + str2 + ... |
| * 4B 4B n1B 4B n2B |
| * |
| * @param obj |
| * @return |
| */ |
| @Override |
| public byte[] serialize(String[] array) { |
| if(array == null) |
| return null; |
| final int size = array.length; |
| final byte[][] tmp = new byte[size][]; |
| int total = 4 + 4 * size; |
| for (int i = 0; i < size; ++i) { |
| try { |
| tmp[i] = array[i].getBytes(UTF_8); |
| } catch (UnsupportedEncodingException e) { |
| throw new IllegalArgumentException("String doesn't support UTF-8 encoding: " + array[i]); |
| } |
| total += tmp[i].length; |
| } |
| final byte[] result = new byte[total]; |
| int offset = 0; |
| ByteUtil.intToBytes(size, result, offset); |
| offset += 4; |
| for (int i = 0; i < size; ++i) { |
| ByteUtil.intToBytes(tmp[i].length, result, offset); |
| offset += 4; |
| System.arraycopy(tmp[i], 0, result, offset, tmp[i].length); |
| offset += tmp[i].length; |
| } |
| return result; |
| } |
| |
| @Override |
| public Class<String[]> type() { |
| return String[].class; |
| } |
| |
| } |