| /* |
| * 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); |
| } |
| } |
| } |