/*
* 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.stanbol.entityhub.indexing.core.source;
import java.util.Map;
import org.apache.stanbol.entityhub.indexing.core.EntityScoreProvider;
import org.apache.stanbol.entityhub.servicesapi.model.Representation;
import org.apache.stanbol.entityhub.servicesapi.model.rdf.RdfResourceEnum;
public class EntityFieldScoreProvider implements EntityScoreProvider {
public static final String PRAM_FIELD_NAME = "field";
public static final String DEFAULT_FIELD_NAME = RdfResourceEnum.entityRank.getUri();
private String fieldName;
/**
* Creates an instance that uses the field as specified by
* {@link RdfResourceEnum#entityRank} to retrieve the score for an entity
*/
public EntityFieldScoreProvider(){
this(null);
}
/**
* Creates an instance that uses the parsed field to retrieve the score for
* an entity or {@link RdfResourceEnum#entityRank} in case <code>null</code>
* is parsed.
* @param fieldName the field used to retrieve the score from parsed
* {@link Representation}s or <code>null</code> to use the
* {@link RdfResourceEnum#entityRank} field.
*/
public EntityFieldScoreProvider(String fieldName){
if(fieldName == null){
this.fieldName = DEFAULT_FIELD_NAME;
} else {
this.fieldName = fieldName;
}
}
@Override
public boolean needsData() {
return true;
}
@Override
public Float process(String id) throws UnsupportedOperationException {
throw new UnsupportedOperationException();
}
@Override
public Float process(Representation entity) throws UnsupportedOperationException {
Object value = entity.getFirst(fieldName);
if(value instanceof Float){
return (Float)value;
} else if(value instanceof Number) {
return Float.valueOf(((Number)value).floatValue());
} else {
if(value != null){
try {
return Float.valueOf(value.toString());
} catch(NumberFormatException e){
return null;
}
} else {
return null;
}
}
}
@Override
public void close() {
//nothing to do
}
@Override
public void initialise() {
//no initialisation needed
}
@Override
public boolean needsInitialisation() {
return false;
}
@Override
public void setConfiguration(Map<String,Object> config) {
Object value = config.get(PRAM_FIELD_NAME);
if(value != null && !value.toString().isEmpty()){
fieldName = value.toString();
}
}
}