| /** |
| * 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.hadoop.io; |
| |
| import java.io.*; |
| import java.lang.reflect.Array; |
| |
| /** A Writable for 2D arrays containing a matrix of instances of a class. */ |
| public class TwoDArrayWritable implements Writable { |
| private Class valueClass; |
| private Writable[][] values; |
| |
| public TwoDArrayWritable(Class valueClass) { |
| this.valueClass = valueClass; |
| } |
| |
| public TwoDArrayWritable(Class valueClass, Writable[][] values) { |
| this(valueClass); |
| this.values = values; |
| } |
| |
| public Object toArray() { |
| int dimensions[] = {values.length, 0}; |
| Object result = Array.newInstance(valueClass, dimensions); |
| for (int i = 0; i < values.length; i++) { |
| Object resultRow = Array.newInstance(valueClass, values[i].length); |
| Array.set(result, i, resultRow); |
| for (int j = 0; j < values[i].length; j++) { |
| Array.set(resultRow, j, values[i][j]); |
| } |
| } |
| return result; |
| } |
| |
| public void set(Writable[][] values) { this.values = values; } |
| |
| public Writable[][] get() { return values; } |
| |
| public void readFields(DataInput in) throws IOException { |
| // construct matrix |
| values = new Writable[in.readInt()][]; |
| for (int i = 0; i < values.length; i++) { |
| values[i] = new Writable[in.readInt()]; |
| } |
| |
| // construct values |
| for (int i = 0; i < values.length; i++) { |
| for (int j = 0; j < values[i].length; j++) { |
| Writable value; // construct value |
| try { |
| value = (Writable)valueClass.newInstance(); |
| } catch (InstantiationException e) { |
| throw new RuntimeException(e.toString()); |
| } catch (IllegalAccessException e) { |
| throw new RuntimeException(e.toString()); |
| } |
| value.readFields(in); // read a value |
| values[i][j] = value; // store it in values |
| } |
| } |
| } |
| |
| public void write(DataOutput out) throws IOException { |
| out.writeInt(values.length); // write values |
| for (int i = 0; i < values.length; i++) { |
| out.writeInt(values[i].length); |
| } |
| for (int i = 0; i < values.length; i++) { |
| for (int j = 0; j < values[i].length; j++) { |
| values[i][j].write(out); |
| } |
| } |
| } |
| } |
| |