| /** |
| * 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.mrql; |
| |
| import java.io.IOException; |
| import java.io.DataInput; |
| import java.io.DataOutput; |
| import org.apache.hadoop.io.*; |
| import org.apache.hadoop.fs.*; |
| |
| |
| /** union values are tagged values, where tag is the descriminator */ |
| public class Union extends MRData { |
| private byte tag; |
| private MRData value; |
| |
| public Union ( byte tag, MRData value ) { |
| this.tag = tag; |
| this.value = value; |
| } |
| |
| public void materializeAll () { value.materializeAll(); }; |
| |
| public byte tag () { return tag; } |
| |
| public MRData value () { return value; } |
| |
| final public void write ( DataOutput out ) throws IOException { |
| out.writeByte(MRContainer.UNION); |
| out.writeByte(tag); |
| value.write(out); |
| } |
| |
| final public static Union read ( DataInput in ) throws IOException { |
| return new Union(in.readByte(),MRContainer.read(in)); |
| } |
| |
| public void readFields ( DataInput in ) throws IOException { |
| tag = in.readByte(); |
| value = MRContainer.read(in); |
| } |
| |
| public int compareTo ( MRData x ) { |
| assert(x instanceof Union); |
| Union p = (Union) x; |
| return (tag == p.tag) |
| ? value.compareTo(p.value) |
| : (tag - p.tag); |
| } |
| |
| final public static int compare ( byte[] x, int xs, int xl, byte[] y, int ys, int yl, int[] size ) { |
| int k = (x[xs] == y[ys]) ? MRContainer.compare(x,xs+1,xl-1,y,ys+1,yl-1,size) : (x[xs]-y[ys]); |
| size[0] += 2; |
| return k; |
| } |
| |
| public boolean equals ( Object x ) { |
| return x instanceof Union && ((Union)x).tag==tag |
| && ((Union)x).value.equals(value); |
| } |
| |
| public int hashCode () { |
| return Math.abs(tag ^ value.hashCode()); |
| } |
| |
| public String toString () { |
| return "union("+tag+","+value+")"; |
| } |
| } |