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 /*
  * 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;
An interface for custom order by comparator function.
public abstract class ComparisonFunc extends WritableComparator {
    // If the comparison is a time consuming process
    // this reporter must be used to report progress
    protected PigProgressable reporter;
    
    public ComparisonFunc() {
        super(NullableTuple.classtrue);
    }

    
Compare two tuples. Note that even though both args are given type of WritableComparable to match the WritableComparable interface, they must both be tuples.

Parameters:
a first tuple
b tuple to compare a to
Returns:
-1 if a < b, 1 if a > b, 0 if a = b
    public int compare(WritableComparable aWritableComparable b) {
        // The incoming key will be in a NullableTuple.  But the comparison
        // function needs a tuple, so pull the tuple out.
    }

    
This callback method must be implemented by all subclasses. Compares its two arguments for order. The order of elements of the tuples correspond to the fields specified in the order by clause. Same semantics as java.util.Comparator.

Parameters:
t1 the first Tuple to be compared.
t2 the second Tuple to be compared.
Returns:
Returns a negative integer, zero, or a positive integer as the first argument is less than, equal to, or greater than the second.
Throws:
java.io.IOException
See also:
java.util.Comparator
    abstract public int compare(Tuple t1Tuple t2);

    
Set the reporter. If the comparison takes a long time the reporter should be called occasionally to avoid Hadoop timing out underneath. The default Hadoop timeout is 600 seconds.

Parameters:
reporter Progress reporter
    public void setReporter(PigProgressable reporter) {
        this. = reporter;
    }
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