org.apache.lucene.queries.spans.SpanPositionRangeQuery Maven / Gradle / Ivy
/*
* 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.
*/
package org.apache.lucene.queries.spans;
import java.io.IOException;
import org.apache.lucene.queries.spans.FilterSpans.AcceptStatus;
/**
* Checks to see if the {@link #getMatch()} lies between a start and end position
*
* See {@link SpanFirstQuery} for a derivation that is optimized for the case where start
* position is 0.
*/
public class SpanPositionRangeQuery extends SpanPositionCheckQuery {
protected int start;
protected int end;
public SpanPositionRangeQuery(SpanQuery match, int start, int end) {
super(match);
this.start = start;
this.end = end;
}
@Override
protected AcceptStatus acceptPosition(Spans spans) throws IOException {
assert spans.startPosition() != spans.endPosition();
AcceptStatus res =
(spans.startPosition() >= end)
? AcceptStatus.NO_MORE_IN_CURRENT_DOC
: (spans.startPosition() >= start && spans.endPosition() <= end)
? AcceptStatus.YES
: AcceptStatus.NO;
return res;
}
/**
* @return The minimum position permitted in a match
*/
public int getStart() {
return start;
}
/**
* @return the maximum end position permitted in a match.
*/
public int getEnd() {
return end;
}
@Override
public String toString(String field) {
StringBuilder buffer = new StringBuilder();
buffer.append("spanPosRange(");
buffer.append(match.toString(field));
buffer.append(", ").append(start).append(", ");
buffer.append(end);
buffer.append(")");
return buffer.toString();
}
@Override
public boolean equals(Object o) {
if (!super.equals(o)) {
return false;
}
SpanPositionRangeQuery other = (SpanPositionRangeQuery) o;
return this.end == other.end && this.start == other.start;
}
@Override
public int hashCode() {
int h = super.hashCode() ^ end;
h = (h * 127) ^ start;
return h;
}
}