/*
* Copyright 2011 <a href="mailto:lincolnbaxter@gmail.com">Lincoln Baxter, III</a>
*
* 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.ocpsoft.rewrite.annotation.handler;
import java.util.Collection;
import org.ocpsoft.common.services.ServiceLoader;
import org.ocpsoft.rewrite.annotation.RewriteConfiguration;
import org.ocpsoft.rewrite.annotation.api.ClassContext;
import org.ocpsoft.rewrite.annotation.api.HandlerChain;
import org.ocpsoft.rewrite.annotation.spi.AnnotationHandler;
import org.ocpsoft.rewrite.config.Configuration;
import org.ocpsoft.rewrite.config.ConfigurationProvider;
import org.ocpsoft.rewrite.config.ConfigurationRuleBuilder;
import org.ocpsoft.rewrite.config.RelocatableRule;
import org.ocpsoft.rewrite.config.Rule;
import org.ocpsoft.rewrite.exception.RewriteException;
public class RewriteConfigurationHandler implements AnnotationHandler<RewriteConfiguration>
{
@Override
public Class<RewriteConfiguration> handles()
{
return RewriteConfiguration.class;
}
@Override
public int priority()
{
return HandlerWeights.WEIGHT_TYPE_STRUCTURAL;
}
@Override
@SuppressWarnings({ "unchecked", "rawtypes" })
public void process(ClassContext context, RewriteConfiguration annotation, HandlerChain chain)
{
Class<?> type = context.getJavaClass();
if (ConfigurationProvider.class.isAssignableFrom(type) && !type.isInterface() && !type.isAnnotation()
&& !type.isArray())
{
Class<ConfigurationProvider<?>> providerType = (Class<ConfigurationProvider<?>>) type;
Collection<ConfigurationProvider<?>> enriched = ServiceLoader.loadEnriched(providerType);
if (enriched.size() == 1)
{
ConfigurationProvider provider = enriched.iterator().next();
Object configurationContext = context.get(type);
if (provider.handles(configurationContext))
{
Configuration config = provider.getConfiguration(configurationContext);
if (config != null)
{
for (Rule rule : config.getRules())
{
ConfigurationRuleBuilder ruleBuilder = context.getConfigurationBuilder().addRule(rule);
if (rule instanceof RelocatableRule && ((RelocatableRule) rule).isRelocated())
ruleBuilder.withPriority(((RelocatableRule) rule).priority());
else
ruleBuilder.withPriority(provider.priority());
}
}
}
else
throw new RewriteException("@" + RewriteConfiguration.class.getSimpleName() + " type [" + type.getName()
+ "] cannot handle context of type [" + configurationContext + "]");
}
else if (enriched.size() < 1)
throw new RewriteException("No service of type [" + type.getName()
+ "] was found while loading configuration.");
else if (enriched.size() > 1)
throw new RewriteException("More than one service of type [" + type.getName()
+ "] was found while loading configuration.");
}
else
{
throw new RewriteException("Class [" + type.getName() + "] annotated with @"
+ RewriteConfiguration.class.getSimpleName()
+ " must implement [" + ConfigurationProvider.class.getName() + "]");
}
chain.proceed();
}
}