/* | |
* 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.shiro.guice.web; | |
import java.lang.reflect.Constructor; | |
import java.util.Collections; | |
import java.util.HashSet; | |
import java.util.Set; | |
import com.google.inject.Inject; | |
import com.google.inject.Injector; | |
import com.google.inject.Key; | |
import com.google.inject.ProvisionException; | |
import com.google.inject.spi.Dependency; | |
import com.google.inject.spi.InjectionPoint; | |
import com.google.inject.spi.ProviderWithDependencies; | |
class AbstractInjectionProvider<T> implements ProviderWithDependencies<T> { | |
private Key<T> key; | |
@Inject | |
Injector injector; | |
private InjectionPoint constructorInjectionPoint; | |
private Set<Dependency<?>> dependencies; | |
public AbstractInjectionProvider(Key<T> key) { | |
this.key = key; | |
constructorInjectionPoint = InjectionPoint.forConstructorOf(key.getTypeLiteral()); | |
Set<Dependency<?>> dependencyBuilder = new HashSet<Dependency<?>>(); | |
dependencyBuilder.addAll(constructorInjectionPoint.getDependencies()); | |
for (InjectionPoint injectionPoint : InjectionPoint.forInstanceMethodsAndFields(key.getTypeLiteral())) { | |
dependencyBuilder.addAll(injectionPoint.getDependencies()); | |
} | |
this.dependencies = Collections.unmodifiableSet(dependencyBuilder); | |
} | |
public T get() { | |
Constructor<T> constructor = getConstructor(); | |
Object[] params = new Object[constructor.getParameterTypes().length]; | |
for (Dependency<?> dependency : constructorInjectionPoint.getDependencies()) { | |
params[dependency.getParameterIndex()] = injector.getInstance(dependency.getKey()); | |
} | |
T t; | |
try { | |
t = constructor.newInstance(params); | |
} catch (Exception e) { | |
throw new ProvisionException("Could not instantiate " + key + "", e); | |
} | |
injector.injectMembers(t); | |
return postProcess(t); | |
} | |
@SuppressWarnings({"unchecked"}) | |
private Constructor<T> getConstructor() { | |
return (Constructor<T>) constructorInjectionPoint.getMember(); | |
} | |
protected T postProcess(T t) { | |
// do nothing by default | |
return t; | |
} | |
public Set<Dependency<?>> getDependencies() { | |
return dependencies; | |
} | |
} |