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/*
* 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.storage.am.common.ophelpers;
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.data.accessors.ITupleReference;
public class MultiComparator {
protected final IBinaryComparator[] cmps;
public MultiComparator(IBinaryComparator[] cmps) {
this.cmps = cmps;
}
public int compare(ITupleReference tupleA, ITupleReference tupleB) {
for (int i = 0; i < cmps.length; i++) {
int cmp = cmps[i].compare(tupleA.getFieldData(i), tupleA.getFieldStart(i), tupleA.getFieldLength(i),
tupleB.getFieldData(i), tupleB.getFieldStart(i), tupleB.getFieldLength(i));
if (cmp != 0) {
return cmp;
}
}
return 0;
}
public int selectiveFieldCompare(ITupleReference tupleA, ITupleReference tupleB, int[] fields) {
for (int j = 0; j < cmps.length; j++) {
int i = fields[j];
int cmp = cmps[j].compare(tupleA.getFieldData(i), tupleA.getFieldStart(i), tupleA.getFieldLength(i),
tupleB.getFieldData(i), tupleB.getFieldStart(i), tupleB.getFieldLength(i));
if (cmp != 0) {
return cmp;
}
}
return 0;
}
public int compare(ITupleReference tupleA, ITupleReference tupleB, int startFieldIndex) {
for (int i = 0; i < cmps.length; i++) {
int ix = startFieldIndex + i;
int cmp = cmps[i].compare(tupleA.getFieldData(ix), tupleA.getFieldStart(ix), tupleA.getFieldLength(ix),
tupleB.getFieldData(ix), tupleB.getFieldStart(ix), tupleB.getFieldLength(ix));
if (cmp != 0) {
return cmp;
}
}
return 0;
}
public int fieldRangeCompare(ITupleReference tupleA, ITupleReference tupleB, int startFieldIndex, int numFields) {
for (int i = startFieldIndex; i < startFieldIndex + numFields; i++) {
int cmp = cmps[i].compare(tupleA.getFieldData(i), tupleA.getFieldStart(i), tupleA.getFieldLength(i),
tupleB.getFieldData(i), tupleB.getFieldStart(i), tupleB.getFieldLength(i));
if (cmp != 0) {
return cmp;
}
}
return 0;
}
public IBinaryComparator[] getComparators() {
return cmps;
}
public int getKeyFieldCount() {
return cmps.length;
}
public static MultiComparator create(IBinaryComparatorFactory[] cmpFactories) {
IBinaryComparator[] cmps = new IBinaryComparator[cmpFactories.length];
for (int i = 0; i < cmpFactories.length; i++) {
cmps[i] = cmpFactories[i].createBinaryComparator();
}
if (cmps.length == 1) {
return new SingleComparator(cmps);
} else {
return new MultiComparator(cmps);
}
}
public static MultiComparator createIgnoreFieldLength(IBinaryComparatorFactory[] cmpFactories) {
IBinaryComparator[] cmps = new IBinaryComparator[cmpFactories.length];
for (int i = 0; i < cmpFactories.length; i++) {
cmps[i] = cmpFactories[i].createBinaryComparator();
}
if (cmps.length == 1) {
return new FieldLengthIgnoringSingleComparator(cmps);
} else {
return new FieldLengthIgnoringSingleComparator(cmps);
}
}
public static MultiComparator create(IBinaryComparatorFactory[] cmpFactories, int startIndex, int numCmps) {
IBinaryComparator[] cmps = new IBinaryComparator[numCmps];
for (int i = startIndex; i < startIndex + numCmps; i++) {
cmps[i] = cmpFactories[i].createBinaryComparator();
}
if (cmps.length == 1) {
return new SingleComparator(cmps);
} else {
return new MultiComparator(cmps);
}
}
public static MultiComparator create(IBinaryComparatorFactory[]... cmpFactories) {
int size = 0;
for (int i = 0; i < cmpFactories.length; i++) {
size += cmpFactories[i].length;
}
IBinaryComparator[] cmps = new IBinaryComparator[size];
int x = 0;
for (int i = 0; i < cmpFactories.length; i++) {
for (int j = 0; j < cmpFactories[i].length; j++) {
cmps[x++] = cmpFactories[i][j].createBinaryComparator();
}
}
if (cmps.length == 1) {
return new SingleComparator(cmps);
} else {
return new MultiComparator(cmps);
}
}
}