| /* |
| * 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.wayang.flink.compiler.criterion; |
| |
| |
| import java.io.ByteArrayInputStream; |
| import java.io.ByteArrayOutputStream; |
| import java.io.IOException; |
| import java.io.ObjectInput; |
| import java.io.ObjectInputStream; |
| import java.io.ObjectOutput; |
| import java.io.ObjectOutputStream; |
| import org.apache.flink.core.memory.DataInputView; |
| import org.apache.flink.core.memory.DataOutputView; |
| import org.apache.flink.types.Value; |
| /** |
| * Implementation of {@link Value} of flink for use in Wayang |
| */ |
| public class WayangValue<T> implements Value { |
| private static final int HIGH_BIT = 0x1 << 7; |
| |
| private static final int HIGH_BIT2 = 0x1 << 13; |
| |
| private static final int HIGH_BIT2_MASK = 0x3 << 6; |
| |
| private T data; |
| |
| public WayangValue(){ |
| this.data = null; |
| } |
| |
| public WayangValue(T element){ |
| this.data = element; |
| } |
| |
| @Override |
| public void write(DataOutputView dataOutputView) throws IOException { |
| byte[] element = convertToByte(); |
| // write the length, variable-length encoded |
| int len = element.length; |
| while (len >= HIGH_BIT) { |
| dataOutputView.write(len | HIGH_BIT); |
| len >>>= 7; |
| } |
| dataOutputView.write(len); |
| dataOutputView.write(element); |
| |
| |
| } |
| |
| @Override |
| public void read(DataInputView dataInputView) throws IOException { |
| |
| int len = dataInputView.readUnsignedByte(); |
| |
| if (len >= HIGH_BIT) { |
| int shift = 7; |
| int curr; |
| len = len & 0x7f; |
| while ((curr = dataInputView.readUnsignedByte()) >= HIGH_BIT) { |
| len |= (curr & 0x7f) << shift; |
| shift += 7; |
| } |
| len |= curr << shift; |
| } |
| |
| byte[] array = new byte[len]; |
| |
| dataInputView.read(array); |
| |
| this.data = convertToObject(array); |
| } |
| |
| public byte[] convertToByte(){ |
| ByteArrayOutputStream bos = new ByteArrayOutputStream(); |
| ObjectOutput out = null; |
| byte[] result = null; |
| try { |
| out = new ObjectOutputStream(bos); |
| out.writeObject(this.data); |
| out.flush(); |
| result = bos.toByteArray(); |
| } catch (IOException e) { |
| e.printStackTrace(); |
| } finally { |
| try { |
| bos.close(); |
| } catch (IOException ex) { |
| ex.printStackTrace(); |
| } |
| } |
| return result; |
| } |
| |
| public T convertToObject(byte[] array){ |
| ByteArrayInputStream bis = new ByteArrayInputStream(array); |
| ObjectInput in = null; |
| T object = null; |
| try { |
| in = new ObjectInputStream(bis); |
| object = (T) in.readObject(); |
| } catch (IOException e) { |
| e.printStackTrace(); |
| } catch (ClassNotFoundException e) { |
| e.printStackTrace(); |
| } finally { |
| try { |
| if (in != null) { |
| in.close(); |
| } |
| } catch (IOException ex) { |
| ex.printStackTrace(); |
| } |
| } |
| return object; |
| } |
| |
| public String toString(){ |
| if(this.data == null){ |
| return "null"; |
| } |
| return this.data.toString(); |
| } |
| |
| public T get(){ |
| return this.data; |
| } |
| } |