opennlp.tools.parser.ParserFactory 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 opennlp.tools.parser;
public class ParserFactory {
private ParserFactory() {
}
/**
* Instantiates a {@link Parser} via a given {@code model} and
* other configuration parameters.
*
* @param model The {@link ParserModel} to use.
* @param beamSize The number of different parses kept during parsing.
* @param advancePercentage The minimal amount of probability mass which advanced outcomes
* must represent. Only outcomes which contribute to the top
* {@code advancePercentage} will be explored.
*
* @return A valid {@link Parser} instance.
* @throws IllegalStateException Thrown if the {@link ParserType} is not supported.
*
* @see Parser
* @see ParserModel
*/
public static Parser create(ParserModel model, int beamSize, double advancePercentage) {
if (ParserType.CHUNKING.equals(model.getParserType())) {
return new opennlp.tools.parser.chunking.Parser(model, beamSize, advancePercentage);
}
else if (ParserType.TREEINSERT.equals(model.getParserType())) {
return new opennlp.tools.parser.treeinsert.Parser(model, beamSize, advancePercentage);
}
else {
throw new IllegalStateException("Unexpected ParserType: " +
model.getParserType().name());
}
}
/**
* Instantiates a {@link Parser} via a given {@code model} and
* default configuration parameters (see: {@link AbstractBottomUpParser}).
*
* @param model The {@link ParserModel} to use.
*
* @return A valid {@link Parser} instance.
* @throws IllegalStateException Thrown if the {@link ParserType} is not supported.
*
* @see Parser
* @see AbstractBottomUpParser
*/
public static Parser create(ParserModel model) {
return create(model, AbstractBottomUpParser.defaultBeamSize,
AbstractBottomUpParser.defaultAdvancePercentage);
}
}