eu.project.ttc.tools.utils.TermPredicates Maven / Gradle / Ivy
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* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright 2, 2015nership. The ASF licenses this file
* to you 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 eu.project.ttc.tools.utils;
import java.text.Collator;
import java.util.Arrays;
import java.util.Collection;
import java.util.Comparator;
import java.util.List;
import java.util.TreeSet;
import com.google.common.collect.ComparisonChain;
import eu.project.ttc.models.Term;
import eu.project.ttc.models.index.TermMeasure;
/**
* Consists exclusively of terms that operate or create {@link TermPredicate}s.
*
* @author Sebastián Peña Saldarriaga
*/
public class TermPredicates {
/** No instances */
private TermPredicates() {
};
/** A predicate that accepts every term */
public static final TermPredicate TRIVIAL_ACCEPTOR = new TermPredicate() {
@Override
public boolean accept(Term term) {
return true;
}
};
/**
* Returns a {@link TermPredicate} the accepts terms whose occurrences are
* bigger than the specified threshold.
*
* @param threshold
* The occurrences threshold
* @return The term predicate
*/
public static TermPredicate createOccurrencesPredicate(final int threshold) {
return new TermPredicate() {
@Override
public boolean accept(Term term) {
return term.getFrequency() >= threshold;
}
};
}
/**
* Returns a {@link TermPredicate} the accepts terms whose measure is
* bigger than the specified threshold.
*
* @param threshold
* The measure threshold
* @return The term predicate
*/
public static TermPredicate createMeasurePredicate(
final double threshold, final TermMeasure termMeasure) {
return new TermPredicate() {
@Override
public boolean accept(Term term) {
return termMeasure.getValue(term) >= threshold;
}
};
}
/**
* Returns a {@link TermPredicate} that accepts terms whose grammatical
* categories are noun or adjective.
*
* @return The term predicate
*/
public static TermPredicate createNounAdjectivePredicate() {
return new TermPredicate() {
@Override
public boolean accept(Term term) {
throw new UnsupportedOperationException("Terms do not support categories yet");
}
};
}
/**
* Returns a {@link TermPredicate} that accepts terms whose grammatical
* categories are verb or adverb.
*
* @return The term predicate
*/
public static TermPredicate createVerbAdverbPredicate() {
return new TermPredicate() {
@Override
public boolean accept(Term term) {
throw new UnsupportedOperationException("Terms do not support categories yet");
}
};
}
/**
* Returns a {@link TermPredicate} that accepts a term that is accepted by
* pred1 or pred2.
*
* @param pred1
* The first predicate
* @param pred2
* The second predicate
* @return The resulting term predicate
*/
public static TermPredicate createOrPredicate(final TermPredicate pred1,
final TermPredicate pred2) {
return new TermPredicate() {
@Override
public boolean accept(Term term) {
return pred1.accept(term) || pred2.accept(term);
}
};
}
/**
* Returns a {@link TermPredicate} that accepts a term that is accepted by
* pred1 and pred2.
*
* @param pred1
* The first predicate
* @param pred2
* The second predicate
* @return The resulting term predicate
*/
public static TermPredicate createAndPredicate(final TermPredicate pred1,
final TermPredicate pred2) {
return new TermPredicate() {
@Override
public boolean accept(Term term) {
return pred1.accept(term) && pred2.accept(term);
}
};
}
/**
* Returns a {@link TermPredicate} that accepts terms in sorted occurrence
* order up to the specified cutoffRank.
*
* @param cutoffRank
* The rank cutoff
* @return The term predicate object
*/
public static TermPredicate createTopNByOccurrencesPredicate(int cutoffRank) {
return createSortedTermPredicate(cutoffRank,
DESCENDING_OCCURRENCE_ORDER);
}
/**
* Returns a {@link TermPredicate} that accepts terms in sorted measure
* order up to the specified cutoffRank.
*
* @param cutoffRank
* The rank cutoff
* @return The term predicate object
*/
public static TermPredicate createTopNByTermMeasurePredicate(int cutoffRank, TermMeasure termMeasure) {
return createSortedTermPredicate(cutoffRank, termMeasure.getTermComparator(true));
}
/**
* Returns a {@link TermPredicate} that accepts terms sorted by the
* specified comparator up to the cutoffRank.
*
* @param cutoffRank
* The rank cutoff
* @param comparator
* The comparator
* @return The term predicate instance
*/
private static TermPredicate createSortedTermPredicate(
final int cutoffRank, final Comparator comparator) {
return new ListBasedTermPredicate() {
@Override
public void initialize(List termList) {
// Sort annotations
TreeSet annotations = new TreeSet(comparator);
annotations.addAll(termList);
System.out.println("Terms in original list : " + termList.size());
System.out.println("Terms in tree set list : " + annotations.size());
System.out.println("Cutoff rank : " + cutoffRank);
// Copy annotation ids up to the cutoff rank
selectedIds = new String[cutoffRank];
int i = 0;
for (Term term : annotations) {
if (i >= cutoffRank) {
break;
}
selectedIds[i++] = term.getGroupingKey();
}
System.out.println("Terms in final list : " + selectedIds.length);
Arrays.sort(selectedIds);
}
};
}
/**
* Creates a {@link TermPredicate} that accepts only terms contained in the
* specified collection
*
* @param collection
* The containment collection
* @return A term predicate instance
*/
public static TermPredicate createContainsPredicate(
final Collection collection) {
return new TermPredicate() {
@Override
public boolean accept(Term term) {
return collection.contains(term);
}
};
}
/**
* A term predicate that can be initialized with a specific term list.
*
* @author Sebastián Peña Saldarriaga
*/
private static abstract class ListBasedTermPredicate implements
TermPredicate {
/** Stores ids that are accepted by the predicate */
protected String[] selectedIds;
/**
* Initializes the predicate with the initial term list.
*
* @param termList
* The initial term list.
*/
public abstract void initialize(List termList);
@Override
public boolean accept(Term term) {
return Arrays.binarySearch(selectedIds, term.getGroupingKey()) >= 0;
}
}
// ////////////////////////////////////////////////////////////////////////
// Comparators
/**
* A comparator that imposes a descending occurrence order on
* {@link Term}s.
*/
public static final Comparator DESCENDING_OCCURRENCE_ORDER = new Comparator() {
@Override
public int compare(Term o1, Term o2) {
return ComparisonChain.start()
.compare(o2.getFrequency(), o1.getFrequency())
.compare(o1.getGroupingKey(), o2.getGroupingKey())
.result();
}
};
// /**
// * A comparator that imposes a descending specificity order on
// * {@link Term}s.
// */
// public static final Comparator DESCENDING_SPECIFICITY_ORDER = new Comparator() {
//
// @Override
// public int compare(Term o1, Term o2) {
// return ComparisonChain.start()
// .compare(o2.getWR(), o1.getWR())
// .compare(o1.getGroupingKey(), o2.getGroupingKey())
// .result();
// }
// };
/**
* A comparator that imposes an ascending covered text order on
* {@link Term}s.
*/
public static final Comparator ASCENDING_TEXT_ORDER = new Comparator() {
/** Compare names in a locale sensitive manner */
private final Collator TextCollator = Collator.getInstance();
@Override
public int compare(Term o1, Term o2) {
return TextCollator.compare(o1.getGroupingKey(), o2.getGroupingKey());
}
};
}
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