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.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.TreeSet;
import org.apache.lucene.index.AtomicReaderContext;
import org.apache.lucene.index.IndexReaderContext;
import org.apache.lucene.index.ReaderUtil;
import org.apache.lucene.index.Term;
import org.apache.lucene.index.TermContext;
import org.apache.lucene.search.DocIdSetIterator;
/**
*
* A wrapper to perform span operations on a non-leaf reader context
* <p>
* NOTE: This should be used for testing purposes only
* @lucene.internal
*/
public class MultiSpansWrapper extends Spans { // can't be package private due to payloads
private SpanQuery query;
private List<AtomicReaderContext> leaves;
private int leafOrd = 0;
private Spans current;
private Map<Term,TermContext> termContexts;
private final int numLeaves;
private MultiSpansWrapper(List<AtomicReaderContext> leaves, SpanQuery query, Map<Term,TermContext> termContexts) {
this.query = query;
this.leaves = leaves;
this.numLeaves = leaves.size();
this.termContexts = termContexts;
}
public static Spans wrap(IndexReaderContext topLevelReaderContext, SpanQuery query) throws IOException {
Map<Term,TermContext> termContexts = new HashMap<Term,TermContext>();
TreeSet<Term> terms = new TreeSet<Term>();
query.extractTerms(terms);
for (Term term : terms) {
termContexts.put(term, TermContext.build(topLevelReaderContext, term, true));
}
final List<AtomicReaderContext> leaves = topLevelReaderContext.leaves();
if(leaves.size() == 1) {
final AtomicReaderContext ctx = leaves.get(0);
return query.getSpans(ctx, ctx.reader().getLiveDocs(), termContexts);
}
return new MultiSpansWrapper(leaves, query, termContexts);
}
@Override
public boolean next() throws IOException {
if (leafOrd >= numLeaves) {
return false;
}
if (current == null) {
final AtomicReaderContext ctx = leaves.get(leafOrd);
current = query.getSpans(ctx, ctx.reader().getLiveDocs(), termContexts);
}
while(true) {
if (current.next()) {
return true;
}
if (++leafOrd < numLeaves) {
final AtomicReaderContext ctx = leaves.get(leafOrd);
current = query.getSpans(ctx, ctx.reader().getLiveDocs(), termContexts);
} else {
current = null;
break;
}
}
return false;
}
@Override
public boolean skipTo(int target) throws IOException {
if (leafOrd >= numLeaves) {
return false;
}
int subIndex = ReaderUtil.subIndex(target, leaves);
assert subIndex >= leafOrd;
if (subIndex != leafOrd) {
final AtomicReaderContext ctx = leaves.get(subIndex);
current = query.getSpans(ctx, ctx.reader().getLiveDocs(), termContexts);
leafOrd = subIndex;
} else if (current == null) {
final AtomicReaderContext ctx = leaves.get(leafOrd);
current = query.getSpans(ctx, ctx.reader().getLiveDocs(), termContexts);
}
while (true) {
if (current.skipTo(target - leaves.get(leafOrd).docBase)) {
return true;
}
if (++leafOrd < numLeaves) {
final AtomicReaderContext ctx = leaves.get(leafOrd);
current = query.getSpans(ctx, ctx.reader().getLiveDocs(), termContexts);
} else {
current = null;
break;
}
}
return false;
}
@Override
public int doc() {
if (current == null) {
return DocIdSetIterator.NO_MORE_DOCS;
}
return current.doc() + leaves.get(leafOrd).docBase;
}
@Override
public int start() {
if (current == null) {
return DocIdSetIterator.NO_MORE_DOCS;
}
return current.start();
}
@Override
public int end() {
if (current == null) {
return DocIdSetIterator.NO_MORE_DOCS;
}
return current.end();
}
@Override
public Collection<byte[]> getPayload() throws IOException {
if (current == null) {
return Collections.emptyList();
}
return current.getPayload();
}
@Override
public boolean isPayloadAvailable() throws IOException {
if (current == null) {
return false;
}
return current.isPayloadAvailable();
}
}