+++ /dev/null
-package org.apache.lucene.search.spans;
-
-/**
- * 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 ownership.
- * 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.
- */
-
-import java.io.IOException;
-
-import java.util.List;
-import java.util.Collection;
-import java.util.ArrayList;
-import java.util.Iterator;
-import java.util.Set;
-
-import org.apache.lucene.index.IndexReader;
-import org.apache.lucene.index.Term;
-import org.apache.lucene.util.PriorityQueue;
-import org.apache.lucene.util.ToStringUtils;
-import org.apache.lucene.search.Query;
-
-/** Matches the union of its clauses.*/
-public class SpanOrQuery extends SpanQuery implements Cloneable {
- private List<SpanQuery> clauses;
- private String field;
-
- /** Construct a SpanOrQuery merging the provided clauses. */
- public SpanOrQuery(SpanQuery... clauses) {
-
- // copy clauses array into an ArrayList
- this.clauses = new ArrayList<SpanQuery>(clauses.length);
- for (int i = 0; i < clauses.length; i++) {
- addClause(clauses[i]);
- }
- }
-
- /** Adds a clause to this query */
- public final void addClause(SpanQuery clause) {
- if (field == null) {
- field = clause.getField();
- } else if (!clause.getField().equals(field)) {
- throw new IllegalArgumentException("Clauses must have same field.");
- }
- this.clauses.add(clause);
- }
-
- /** Return the clauses whose spans are matched. */
- public SpanQuery[] getClauses() {
- return clauses.toArray(new SpanQuery[clauses.size()]);
- }
-
- @Override
- public String getField() { return field; }
-
- @Override
- public void extractTerms(Set<Term> terms) {
- for(final SpanQuery clause: clauses) {
- clause.extractTerms(terms);
- }
- }
-
- @Override
- public Object clone() {
- int sz = clauses.size();
- SpanQuery[] newClauses = new SpanQuery[sz];
-
- for (int i = 0; i < sz; i++) {
- newClauses[i] = (SpanQuery) clauses.get(i).clone();
- }
- SpanOrQuery soq = new SpanOrQuery(newClauses);
- soq.setBoost(getBoost());
- return soq;
- }
-
- @Override
- public Query rewrite(IndexReader reader) throws IOException {
- SpanOrQuery clone = null;
- for (int i = 0 ; i < clauses.size(); i++) {
- SpanQuery c = clauses.get(i);
- SpanQuery query = (SpanQuery) c.rewrite(reader);
- if (query != c) { // clause rewrote: must clone
- if (clone == null)
- clone = (SpanOrQuery) this.clone();
- clone.clauses.set(i,query);
- }
- }
- if (clone != null) {
- return clone; // some clauses rewrote
- } else {
- return this; // no clauses rewrote
- }
- }
-
- @Override
- public String toString(String field) {
- StringBuilder buffer = new StringBuilder();
- buffer.append("spanOr([");
- Iterator<SpanQuery> i = clauses.iterator();
- while (i.hasNext()) {
- SpanQuery clause = i.next();
- buffer.append(clause.toString(field));
- if (i.hasNext()) {
- buffer.append(", ");
- }
- }
- buffer.append("])");
- buffer.append(ToStringUtils.boost(getBoost()));
- return buffer.toString();
- }
-
- @Override
- public boolean equals(Object o) {
- if (this == o) return true;
- if (o == null || getClass() != o.getClass()) return false;
-
- final SpanOrQuery that = (SpanOrQuery) o;
-
- if (!clauses.equals(that.clauses)) return false;
- if (!clauses.isEmpty() && !field.equals(that.field)) return false;
-
- return getBoost() == that.getBoost();
- }
-
- @Override
- public int hashCode() {
- int h = clauses.hashCode();
- h ^= (h << 10) | (h >>> 23);
- h ^= Float.floatToRawIntBits(getBoost());
- return h;
- }
-
-
- private class SpanQueue extends PriorityQueue<Spans> {
- public SpanQueue(int size) {
- initialize(size);
- }
-
- @Override
- protected final boolean lessThan(Spans spans1, Spans spans2) {
- if (spans1.doc() == spans2.doc()) {
- if (spans1.start() == spans2.start()) {
- return spans1.end() < spans2.end();
- } else {
- return spans1.start() < spans2.start();
- }
- } else {
- return spans1.doc() < spans2.doc();
- }
- }
- }
-
- @Override
- public Spans getSpans(final IndexReader reader) throws IOException {
- if (clauses.size() == 1) // optimize 1-clause case
- return (clauses.get(0)).getSpans(reader);
-
- return new Spans() {
- private SpanQueue queue = null;
-
- private boolean initSpanQueue(int target) throws IOException {
- queue = new SpanQueue(clauses.size());
- Iterator<SpanQuery> i = clauses.iterator();
- while (i.hasNext()) {
- Spans spans = i.next().getSpans(reader);
- if ( ((target == -1) && spans.next())
- || ((target != -1) && spans.skipTo(target))) {
- queue.add(spans);
- }
- }
- return queue.size() != 0;
- }
-
- @Override
- public boolean next() throws IOException {
- if (queue == null) {
- return initSpanQueue(-1);
- }
-
- if (queue.size() == 0) { // all done
- return false;
- }
-
- if (top().next()) { // move to next
- queue.updateTop();
- return true;
- }
-
- queue.pop(); // exhausted a clause
- return queue.size() != 0;
- }
-
- private Spans top() { return queue.top(); }
-
- @Override
- public boolean skipTo(int target) throws IOException {
- if (queue == null) {
- return initSpanQueue(target);
- }
-
- boolean skipCalled = false;
- while (queue.size() != 0 && top().doc() < target) {
- if (top().skipTo(target)) {
- queue.updateTop();
- } else {
- queue.pop();
- }
- skipCalled = true;
- }
-
- if (skipCalled) {
- return queue.size() != 0;
- }
- return next();
- }
-
- @Override
- public int doc() { return top().doc(); }
- @Override
- public int start() { return top().start(); }
- @Override
- public int end() { return top().end(); }
-
- @Override
- public Collection<byte[]> getPayload() throws IOException {
- ArrayList<byte[]> result = null;
- Spans theTop = top();
- if (theTop != null && theTop.isPayloadAvailable()) {
- result = new ArrayList<byte[]>(theTop.getPayload());
- }
- return result;
- }
-
- @Override
- public boolean isPayloadAvailable() {
- Spans top = top();
- return top != null && top.isPayloadAvailable();
- }
-
- @Override
- public String toString() {
- return "spans("+SpanOrQuery.this+")@"+
- ((queue == null)?"START"
- :(queue.size()>0?(doc()+":"+start()+"-"+end()):"END"));
- }
-
- };
- }
-
-}
fnp / pylucene.git / blobdiff