| /* |
| * 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.storage.am.lsm.invertedindex.search; |
| |
| import edu.uci.ics.hyracks.storage.am.lsm.invertedindex.api.IInvertedIndexSearchModifier; |
| |
| public class EditDistanceSearchModifier implements IInvertedIndexSearchModifier { |
| |
| private int gramLength; |
| private int edThresh; |
| |
| public EditDistanceSearchModifier(int gramLength, int edThresh) { |
| this.gramLength = gramLength; |
| this.edThresh = edThresh; |
| } |
| |
| @Override |
| public int getOccurrenceThreshold(int numQueryTokens) { |
| return numQueryTokens - edThresh * gramLength; |
| } |
| |
| @Override |
| public int getNumPrefixLists(int occurrenceThreshold, int numInvLists) { |
| return numInvLists - occurrenceThreshold + 1; |
| } |
| |
| @Override |
| public short getNumTokensLowerBound(short numQueryTokens) { |
| return (short) (numQueryTokens - edThresh); |
| } |
| |
| @Override |
| public short getNumTokensUpperBound(short numQueryTokens) { |
| return (short) (numQueryTokens + edThresh); |
| } |
| |
| public int getGramLength() { |
| return gramLength; |
| } |
| |
| public void setGramLength(int gramLength) { |
| this.gramLength = gramLength; |
| } |
| |
| public int getEdThresh() { |
| return edThresh; |
| } |
| |
| public void setEdThresh(int edThresh) { |
| this.edThresh = edThresh; |
| } |
| |
| @Override |
| public String toString() { |
| return "Edit Distance Search Modifier, GramLen: " + gramLength + ", Threshold: " + edThresh; |
| } |
| } |