Java tutorial
/* * Copyright 2009-2013 by The Regents of the University of California * Licensed 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 from * * 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 edu.uci.ics.hyracks.dataflow.hadoop.data; import org.apache.hadoop.io.RawComparator; import edu.uci.ics.hyracks.api.dataflow.value.IBinaryComparator; import edu.uci.ics.hyracks.api.dataflow.value.IBinaryComparatorFactory; import edu.uci.ics.hyracks.dataflow.common.util.ReflectionUtils; public class KeyBinaryComparatorFactory<T> implements IBinaryComparatorFactory { private static final long serialVersionUID = 1L; private Class<? extends RawComparator<T>> cmpClass; public KeyBinaryComparatorFactory(Class<? extends RawComparator<T>> cmpClass) { this.cmpClass = cmpClass; } @Override public IBinaryComparator createBinaryComparator() { final RawComparator<T> instance = ReflectionUtils.createInstance(cmpClass); return new IBinaryComparator() { @Override public int compare(byte[] b1, int s1, int l1, byte[] b2, int s2, int l2) { return instance.compare(b1, s1, l1, b2, s2, l2); } }; } }