| /* |
| * 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.datasketches; |
| |
| import org.apache.datasketches.memory.Memory; |
| import org.apache.datasketches.memory.UnsafeUtil; |
| import org.apache.datasketches.memory.WritableMemory; |
| |
| /** |
| * Methods of serializing and deserializing arrays of String. |
| * This class serializes strings using internal Java representation as char[], where each char |
| * is a 16-bit code. The result is larger than one from {@link ArrayOfStringsSerDe}. |
| * In an extreme case when all strings are in ASCII, the size is doubled. However it takes |
| * less time to serialize and deserialize by a factor of 1.5 to 2. |
| * |
| * @author Alexander Saydakov |
| */ |
| public class ArrayOfUtf16StringsSerDe extends ArrayOfItemsSerDe<String> { |
| |
| @Override |
| public byte[] serializeToByteArray(final String[] items) { |
| int length = 0; |
| for (int i = 0; i < items.length; i++) { |
| length += (items[i].length() * Character.BYTES) + Integer.BYTES; |
| } |
| final byte[] bytes = new byte[length]; |
| final WritableMemory mem = WritableMemory.wrap(bytes); |
| long offsetBytes = 0; |
| for (int i = 0; i < items.length; i++) { |
| mem.putInt(offsetBytes, items[i].length()); |
| offsetBytes += Integer.BYTES; |
| mem.putCharArray(offsetBytes, items[i].toCharArray(), 0, items[i].length()); |
| offsetBytes += (long) (items[i].length()) * Character.BYTES; |
| } |
| return bytes; |
| } |
| |
| @Override |
| public String[] deserializeFromMemory(final Memory mem, final int numItems) { |
| final String[] array = new String[numItems]; |
| long offsetBytes = 0; |
| for (int i = 0; i < numItems; i++) { |
| UnsafeUtil.checkBounds(offsetBytes, Integer.BYTES, mem.getCapacity()); |
| final int strLength = mem.getInt(offsetBytes); |
| offsetBytes += Integer.BYTES; |
| final char[] chars = new char[strLength]; |
| UnsafeUtil.checkBounds(offsetBytes, (long) strLength * Character.BYTES, mem.getCapacity()); |
| mem.getCharArray(offsetBytes, chars, 0, strLength); |
| array[i] = new String(chars); |
| offsetBytes += (long) strLength * Character.BYTES; |
| } |
| return array; |
| } |
| |
| } |