/*
* Copyright 2008 Google 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 com.google.gwt.inject.rebind.binding;
import com.google.gwt.inject.rebind.reflect.NoSourceNameException;
import com.google.gwt.inject.rebind.reflect.ReflectUtil;
import com.google.gwt.inject.rebind.util.InjectorMethod;
import com.google.gwt.inject.rebind.util.NameGenerator;
import com.google.gwt.inject.rebind.util.Preconditions;
import com.google.gwt.inject.rebind.util.SourceSnippet;
import com.google.gwt.inject.rebind.util.SourceSnippetBuilder;
import com.google.gwt.inject.rebind.util.SourceSnippets;
import com.google.inject.Key;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import javax.inject.Provider;
/**
* A binding to call the requested {@link com.google.inject.Provider}.
*/
public class BindProviderBinding extends AbstractBinding implements Binding {
private final Key<? extends Provider<?>> providerKey;
private final Key<?> sourceKey;
BindProviderBinding(Key<? extends Provider<?>> providerKey, Key<?> sourceKey, Context context) {
// In which package should we place the code to inject and use a
// user-supplied provider, given that the provider might be in a different
// package from the type it provides?
//
// This binding needs to be able to create and use a provider, which means
// that the creator method needs to go in the provider's package. If the
// provided type (the source key) is in a different package, it has to be
// visible in the provider's package; otherwise, the provider couldn't
// return it from get().
super(context, providerKey);
this.providerKey = Preconditions.checkNotNull(providerKey);
this.sourceKey = Preconditions.checkNotNull(sourceKey);
}
public SourceSnippet getCreationStatements(NameGenerator nameGenerator,
List<InjectorMethod> methodsOutput) throws NoSourceNameException {
String providedType = ReflectUtil.getSourceName(sourceKey.getTypeLiteral());
return new SourceSnippetBuilder()
.append(providedType).append(" result = ").append(SourceSnippets.callGetter(providerKey))
.append(".get();")
.build();
}
public Collection<Dependency> getDependencies() {
Context context = getContext();
Collection<Dependency> dependencies = new ArrayList<Dependency>();
dependencies.add(new Dependency(Dependency.GINJECTOR, sourceKey, context));
dependencies.add(new Dependency(sourceKey, providerKey, context));
return dependencies;
}
}