/*
* Copyright 2010 the original author or authors.
*
* 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.spockframework.runtime.condition;
import java.util.*;
import org.spockframework.util.InternalSpockError;
public class ObjectRendererService implements IObjectRendererService {
private final HashMap<Class<?>, IObjectRenderer<?>> renderers = new HashMap<Class<?>, IObjectRenderer<?>>();
public <T> void addRenderer(Class<T> type, IObjectRenderer<? super T> renderer) {
renderers.put(type, renderer);
}
@SuppressWarnings("unchecked")
public String render(Object object) {
if (object == null) return "null\n";
// explicit parameterization required although IDEA thinks it's redundant
Set<Class<?>> types = Collections.<Class<?>>singleton(object.getClass());
while (!types.isEmpty()) {
for (Class<?> type : types) {
IObjectRenderer renderer = renderers.get(type);
if (renderer != null) return renderer.render(object);
}
types = getParents(types);
}
// only fall back to renderer for type Object once all other options have been exhausted
IObjectRenderer renderer = renderers.get(Object.class);
if (renderer != null) return renderer.render(object);
throw new InternalSpockError("no renderer for type Object found");
}
private Set<Class<?>> getParents(Set<Class<?>> types) {
Set<Class<?>> parents = new HashSet<Class<?>>();
for (Class<?> type : types) {
Class<?> superclass = type.getSuperclass();
if (superclass != null && superclass != Object.class) {
parents.add(superclass);
}
// cast required to compile with JDK 5
parents.addAll(Arrays.asList((Class<?>[]) type.getInterfaces()));
}
return parents;
}
}