| /* |
| * Copyright 2009-2010 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.common.comm.io; |
| |
| import edu.uci.ics.hyracks.api.dataflow.value.IBinaryComparator; |
| |
| public class FrameTuplePairComparator { |
| private final int[] keys0; |
| private final int[] keys1; |
| private final IBinaryComparator[] comparators; |
| |
| public FrameTuplePairComparator(int[] keys0, int[] keys1, IBinaryComparator[] comparators) { |
| this.keys0 = keys0; |
| this.keys1 = keys1; |
| this.comparators = comparators; |
| } |
| |
| public int compare(FrameTupleAccessor accessor0, int tIndex0, FrameTupleAccessor accessor1, int tIndex1) { |
| int tStart0 = accessor0.getTupleStartOffset(tIndex0); |
| int fStartOffset0 = accessor0.getFieldSlotsLength() + tStart0; |
| |
| int tStart1 = accessor1.getTupleStartOffset(tIndex1); |
| int fStartOffset1 = accessor1.getFieldSlotsLength() + tStart1; |
| |
| for (int i = 0; i < keys0.length; ++i) { |
| int fIdx0 = keys0[i]; |
| int fStart0 = accessor0.getFieldStartOffset(tIndex0, fIdx0); |
| int fEnd0 = accessor0.getFieldEndOffset(tIndex0, fIdx0); |
| int fLen0 = fEnd0 - fStart0; |
| |
| int fIdx1 = keys1[i]; |
| int fStart1 = accessor1.getFieldStartOffset(tIndex1, fIdx1); |
| int fEnd1 = accessor1.getFieldEndOffset(tIndex1, fIdx1); |
| int fLen1 = fEnd1 - fStart1; |
| |
| int c = comparators[i].compare(accessor0.getBuffer().array(), fStart0 + fStartOffset0, fLen0, accessor1 |
| .getBuffer().array(), fStart1 + fStartOffset1, fLen1); |
| if (c != 0) { |
| return c; |
| } |
| } |
| return 0; |
| } |
| } |