| /* |
| * 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.pig; |
| |
| import java.io.DataInput; |
| import java.io.DataOutput; |
| import java.io.IOException; |
| import java.io.Serializable; |
| |
| import org.apache.hadoop.io.WritableComparable; |
| |
| import org.apache.pig.classification.InterfaceAudience; |
| import org.apache.pig.classification.InterfaceStability; |
| import org.apache.pig.data.DataReaderWriter; |
| |
| /** |
| * This class represents a relative position in a file. It records a filename |
| * and an offset. This allows Pig to order FileSplits. |
| * @since Pig 0.7 |
| */ |
| @InterfaceAudience.Public |
| @InterfaceStability.Evolving // Since we haven't done outer join for merge join yet |
| public class FileSplitComparable implements WritableComparable<FileSplitComparable>, Serializable{ |
| |
| private static final long serialVersionUID = 1L; |
| protected String filename; |
| protected Long offset; |
| |
| //need a default constructor to be able to de-serialize using just |
| // the Writable interface |
| public FileSplitComparable(){} |
| |
| public FileSplitComparable(String fileName, long offset){ |
| this.filename = fileName; |
| this.offset = offset; |
| } |
| |
| |
| @Override |
| public int compareTo(FileSplitComparable other) { |
| int rc = filename.compareTo(other.filename); |
| if (rc == 0) |
| rc = Long.signum(offset - other.offset); |
| return rc; |
| } |
| |
| |
| @Override |
| public void readFields(DataInput in) throws IOException { |
| filename = (String) DataReaderWriter.readDatum(in); |
| offset = (Long)DataReaderWriter.readDatum(in); |
| } |
| |
| |
| @Override |
| public void write(DataOutput out) throws IOException { |
| DataReaderWriter.writeDatum(out, filename); |
| DataReaderWriter.writeDatum(out, offset); |
| } |
| |
| @Override |
| public String toString(){ |
| return "FileName: '" + filename + "' Offset: " + offset; |
| } |
| |
| /* (non-Javadoc) |
| * @see java.lang.Object#hashCode() |
| */ |
| @Override |
| public int hashCode() { |
| final int prime = 31; |
| int result = 1; |
| result = prime * result |
| + ((filename == null) ? 0 : filename.hashCode()); |
| result = prime * result + ((offset == null) ? 0 : offset.hashCode()); |
| return result; |
| } |
| |
| /* (non-Javadoc) |
| * @see java.lang.Object#equals(java.lang.Object) |
| */ |
| @Override |
| public boolean equals(Object obj) { |
| if (this == obj) |
| return true; |
| if (obj == null) |
| return false; |
| if (getClass() != obj.getClass()) |
| return false; |
| FileSplitComparable other = (FileSplitComparable) obj; |
| if (filename == null) { |
| if (other.filename != null) |
| return false; |
| } else if (!filename.equals(other.filename)) |
| return false; |
| if (offset == null) { |
| if (other.offset != null) |
| return false; |
| } else if (!offset.equals(other.offset)) |
| return false; |
| return true; |
| } |
| } |