org.trypticon.luceneupgrader.lucene3.internal.lucene.search.function.FloatFieldSource Maven / Gradle / Ivy
package org.trypticon.luceneupgrader.lucene3.internal.lucene.search.function;
/**
* 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 org.trypticon.luceneupgrader.lucene3.internal.lucene.index.IndexReader;
import org.trypticon.luceneupgrader.lucene3.internal.lucene.search.FieldCache;
import java.io.IOException;
/**
* Expert: obtains float field values from the
* {@link org.trypticon.luceneupgrader.lucene3.internal.lucene.search.FieldCache FieldCache}
* using getFloats() and makes those values
* available as other numeric types, casting as needed.
*
* @lucene.experimental
*
* @see org.trypticon.luceneupgrader.lucene3.internal.lucene.search.function.FieldCacheSource for requirements
* on the field.
*
* NOTE: with the switch in 2.9 to segment-based
* searching, if {@link #getValues} is invoked with a
* composite (multi-segment) reader, this can easily cause
* double RAM usage for the values in the FieldCache. It's
* best to switch your application to pass only atomic
* (single segment) readers to this API.
*/
public class FloatFieldSource extends FieldCacheSource {
private FieldCache.FloatParser parser;
/**
* Create a cached float field source with default string-to-float parser.
*/
public FloatFieldSource(String field) {
this(field, null);
}
/**
* Create a cached float field source with a specific string-to-float parser.
*/
public FloatFieldSource(String field, FieldCache.FloatParser parser) {
super(field);
this.parser = parser;
}
/*(non-Javadoc) @see org.apache.lucene.search.function.ValueSource#description() */
@Override
public String description() {
return "float(" + super.description() + ')';
}
/*(non-Javadoc) @see org.apache.lucene.search.function.FieldCacheSource#getCachedValues(org.apache.lucene.search.FieldCache, java.lang.String, org.apache.lucene.index.IndexReader) */
@Override
public DocValues getCachedFieldValues (FieldCache cache, String field, IndexReader reader) throws IOException {
final float[] arr = cache.getFloats(reader, field, parser);
return new DocValues() {
/*(non-Javadoc) @see org.apache.lucene.search.function.DocValues#floatVal(int) */
@Override
public float floatVal(int doc) {
return arr[doc];
}
/*(non-Javadoc) @see org.apache.lucene.search.function.DocValues#toString(int) */
@Override
public String toString(int doc) {
return description() + '=' + arr[doc];
}
/*(non-Javadoc) @see org.apache.lucene.search.function.DocValues#getInnerArray() */
@Override
Object getInnerArray() {
return arr;
}
};
}
/*(non-Javadoc) @see org.apache.lucene.search.function.FieldCacheSource#cachedFieldSourceEquals(org.apache.lucene.search.function.FieldCacheSource) */
@Override
public boolean cachedFieldSourceEquals(FieldCacheSource o) {
if (o.getClass() != FloatFieldSource.class) {
return false;
}
FloatFieldSource other = (FloatFieldSource)o;
return this.parser==null ?
other.parser==null :
this.parser.getClass() == other.parser.getClass();
}
/*(non-Javadoc) @see org.apache.lucene.search.function.FieldCacheSource#cachedFieldSourceHashCode() */
@Override
public int cachedFieldSourceHashCode() {
return parser==null ?
Float.class.hashCode() : parser.getClass().hashCode();
}
}