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DomainModelSupport.java
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DomainModelSupport.java
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/*
* Copyright 2011 JBoss Inc
*
* Licensed 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.drools.informer.domain;
import org.drools.informer.Question;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
/**
* <p>
* Utility class used by the Tohu built-in rules for translating between <code>Question</code> answers and arbitrary Java classes
* used in a custom domain model.
* </p>
*
* <p>
* Default adapters are provided for all the standard Java classes but new ones can be plugged in by calling
* <code>registerAdapter</code>.
* </p>
*
* @see org.drools.informer.domain.CharDomainModelAdapter
* @see org.drools.informer.domain.DecimalDomainModelAdapter
* @see org.drools.informer.domain.NumberDomainModelAdapter
* @see org.drools.informer.domain.StraightThroughDomainModelAdapter
*
* @author Damon Horrell
*/
public class DomainModelSupport {
private static Map<String, DomainModelAdapter> adapters = new HashMap<String, DomainModelAdapter>();
static {
registerAdapter(new StraightThroughDomainModelAdapter(Question.QuestionType.TYPE_TEXT, String.class));
registerAdapter(new CharDomainModelAdapter()); // TYPE_TEXT
registerAdapter(new NumberDomainModelAdapter()); // TYPE_NUMBER
registerAdapter(new DecimalDomainModelAdapter()); // TYPE_DECIMAL
registerAdapter(new BooleanDomainModelAdapter()); // TYPE_BOOLEAN
registerAdapter(new StraightThroughDomainModelAdapter(Question.QuestionType.TYPE_DATE, Date.class));
registerAdapter(new ListDomainModelAdapter());
}
/**
* If necessary transform specific list implementations to the list interface name
*/
private static String createAdapterKey(Class<?> clazz) {
String className = java.util.List.class.isAssignableFrom(clazz) ? "java.util.List" : clazz.getName();
return className;
}
/**
* Registers a new Domain Model Adapter.
*
* @see org.drools.informer.domain.DomainModelAdapter
*
* @param adapter
*/
public static void registerAdapter(DomainModelAdapter adapter) {
for (Class<?> clazz : adapter.getSupportedClasses()) {
adapters.put(createAdapterKey(clazz), adapter);
}
}
/**
* Converts an answer of type <code>answerType</code> to an instance of <code>clazz</code> using the registered
* DomainModelAdapter for this class.
*
* <p>
* If no <code>DomainModelAdapter</code> is registered for the specified class then
* <code>java.lang.UnsupportedOperationException</code> is thrown.
* </p>
*
* @param answerType
* @param answer
* @param clazz
* @return
*/
public static Object answerToObject(Question.QuestionType answerType, Object answer, Class<?> clazz) {
DomainModelAdapter adapter = adapters.get(createAdapterKey(clazz));
if (adapter == null) {
throw new UnsupportedOperationException("Unable to convert from answer type " + answerType + " to Java class "
+ clazz.getName());
}
return adapter.answerToObject(answer, clazz);
}
/**
* Converts an arbitrary Java object to an answer of type <code>answerType</code> using the registered DomainModelAdapter
* for this object's class.
*
* <p>
* If no <code>DomainModelAdapter</code> is registered for this object's class then
* <code>java.lang.UnsupportedOperationException</code> is thrown.
* </p>
*
* @param object
* @param answerType
* @return
*/
public static Object objectToAnswer(Object object, Question.QuestionType answerType) {
if (object == null) {
return null;
}
Class<? extends Object> clazz = object.getClass();
DomainModelAdapter adapter = adapters.get(createAdapterKey(clazz));
if (adapter == null) {
throw new UnsupportedOperationException("Unable to convert from Java class " + clazz.getName() + " to answer type "
+ answerType);
}
return adapter.objectToAnswer(object);
}
/**
* <p>
* Returns the <code>answerType</code> corresponding to the specified class.
* </p>
*
* <p>
* If no <code>DomainModelAdapter</code> is registered for the specified class then
* <code>java.lang.UnsupportedOperationException</code> is thrown.
* </p>
*
* @param clazz
* @return
*/
public static Question.QuestionType classToAnswerType(Class<?> clazz) {
DomainModelAdapter adapter = adapters.get(createAdapterKey(clazz));
if (adapter == null) {
throw new UnsupportedOperationException("Unable to support Java class " + clazz);
}
return adapter.getAnswerType();
}
}