| /* |
| * 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.opennlp.ml.maxent; |
| |
| import java.util.Collections; |
| import java.util.HashMap; |
| import java.util.Map; |
| import java.util.NoSuchElementException; |
| import java.util.Set; |
| |
| import org.apache.opennlp.ml.model.MaxentModel; |
| |
| /** |
| * A class which stores a mapping from ModelDomain objects to MaxentModels. |
| * This permits an application to replace an old model for a domain with a |
| * newly trained one in a thread-safe manner. By calling the getModel() |
| * method, the application can create new instances of classes which use the |
| * relevant models. |
| */ |
| public class DomainToModelMap { |
| |
| // the underlying object which stores the mapping |
| private Map<ModelDomain, MaxentModel> map = Collections.synchronizedMap(new HashMap<ModelDomain, MaxentModel>()); |
| |
| /** |
| * Sets the model for the given domain. |
| * |
| * @param domain |
| * The ModelDomain object which keys to the model. |
| * @param model |
| * The MaxentModel trained for the domain. |
| */ |
| public void setModelForDomain(ModelDomain domain, MaxentModel model) { |
| map.put(domain, model); |
| } |
| |
| /** |
| * Get the model mapped to by the given ModelDomain key. |
| * |
| * @param domain |
| * The ModelDomain object which keys to the desired model. |
| * @return The MaxentModel corresponding to the given domain. |
| */ |
| public MaxentModel getModel(ModelDomain domain) { |
| if (map.containsKey(domain)) { |
| return map.get(domain); |
| } else { |
| throw new NoSuchElementException("No model has been created for " |
| + "domain: " + domain); |
| } |
| } |
| |
| /** |
| * Removes the mapping for this ModelDomain key from this map if present. |
| * |
| * @param domain |
| * The ModelDomain key whose mapping is to be removed from the map. |
| */ |
| public void removeDomain(ModelDomain domain) { |
| map.remove(domain); |
| } |
| |
| /** |
| * A set view of the ModelDomain keys contained in this map. |
| * |
| * @return a set view of the ModelDomain keys contained in this map |
| */ |
| public Set keySet() { |
| return map.keySet(); |
| } |
| |
| } |