/*
* Copyright 2004-2009 the original author or authors.
*
* 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 at
*
* 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 org.compass.core.impl;
import java.util.Arrays;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import org.compass.core.CompassTermFreq;
import org.compass.core.CompassTermFreqsBuilder;
import org.compass.core.engine.SearchEngineInternalSearch;
import org.compass.core.engine.SearchEngineTermFrequencies;
import org.compass.core.mapping.ResourceMapping;
import org.compass.core.mapping.ResourcePropertyLookup;
import org.compass.core.spi.InternalCompassSession;
/**
* @author kimchy
*/
public class DefaultCompassTermFreqsBuilder implements CompassTermFreqsBuilder {
private InternalCompassSession session;
private String[] propertyNames;
private int size;
private String[] aliases;
private String[] subIndexes;
private int minNorm = -1;
private int maxNorm = -1;
private Sort sort = Sort.FREQ;
public DefaultCompassTermFreqsBuilder(InternalCompassSession session, String[] names) {
this.session = session;
this.propertyNames = new String[names.length];
for (int i = 0; i < names.length; i++) {
ResourcePropertyLookup lookup = session.getMapping().getResourcePropertyLookup(names[i]);
this.propertyNames[i] = lookup.getPath();
}
this.size = 10;
}
public CompassTermFreqsBuilder setSize(int size) {
this.size = size;
return this;
}
public CompassTermFreqsBuilder setAliases(String ... aliases) {
this.aliases = aliases;
return this;
}
public CompassTermFreqsBuilder setTypes(Class ... types) {
if (types == null) {
this.aliases = null;
return this;
}
String[] aliases = new String[types.length];
for (int i = 0; i < types.length; i++) {
ResourceMapping resourceMapping = session.getMapping().getRootMappingByClass(types[i]);
aliases[i] = resourceMapping.getAlias();
}
setAliases(aliases);
return this;
}
public CompassTermFreqsBuilder setSubIndexes(String ... subIndexes) {
this.subIndexes = subIndexes;
return this;
}
public CompassTermFreqsBuilder normalize(int min, int max) {
this.minNorm = min;
this.maxNorm = max;
return this;
}
public CompassTermFreqsBuilder setSort(Sort sort) {
this.sort = sort;
return this;
}
public CompassTermFreq[] toTermFreqs() {
SearchEngineInternalSearch internalSearch = session.getSearchEngine().internalSearch(subIndexes, aliases);
SearchEngineTermFrequencies seTermFreqs = session.getSearchEngine().termFreq(propertyNames, size, internalSearch);
CompassTermFreq[] termFreqs = seTermFreqs.getTerms();
if (sort == Sort.TERM) {
List<CompassTermFreq> list = Arrays.asList(termFreqs);
Collections.sort(list, new Comparator<CompassTermFreq>() {
public int compare(CompassTermFreq o1, CompassTermFreq o2) {
return o1.getTerm().compareTo(o2.getTerm());
}
});
termFreqs = list.toArray(new CompassTermFreq[list.size()]);
}
if (minNorm != -1 && maxNorm != -1) {
int min = Integer.MAX_VALUE;
int max = Integer.MIN_VALUE;
for (CompassTermFreq termFreq : termFreqs) {
if (termFreq.getFreq() < min) {
min = (int) termFreq.getFreq();
}
if (termFreq.getFreq() > max) {
max = (int) termFreq.getFreq();
}
}
for (CompassTermFreq termFreq : termFreqs) {
float freq;
if ((int) termFreq.getFreq() == min) {
freq = minNorm;
} else if ((int) termFreq.getFreq() == max) {
freq = maxNorm;
} else {
freq = minNorm + (termFreq.getFreq() - min) / (max - min) * (maxNorm - minNorm);
}
((DefaultCompassTermFreq) termFreq).setFreq(freq);
}
}
return termFreqs;
}
}