/*
* Copyright 2010 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.ErrorManager;
import com.google.gwt.inject.rebind.GinjectorBindings;
import com.google.gwt.inject.rebind.GinjectorNameGenerator;
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.Collection;
import java.util.Collections;
import java.util.List;
/**
* Binding that represents a value exposed to this level from lower in the injector hierarchy.
*
* TODO(bchambers): As with {@link ParentBinding} it would be nice if this didn't need the
* no-op creator method.
*/
public class ExposedChildBinding extends AbstractBinding implements Binding {
private final ErrorManager errorManager;
private final Key<?> key;
private final GinjectorBindings childBindings;
public ExposedChildBinding(ErrorManager errorManager, Key<?> key, GinjectorBindings childBindings,
Context context) {
super(context, key);
this.errorManager = Preconditions.checkNotNull(errorManager);
this.key = Preconditions.checkNotNull(key);
this.childBindings = Preconditions.checkNotNull(childBindings);
}
/**
* The getter must be placed in the same package as the child getter, to ensure that its return
* type is visible.
*/
public String getGetterMethodPackage() {
Binding childBinding = childBindings.getBinding(key);
if (childBinding == null) {
// The child binding should exist before we try to expose it!
errorManager.logError("No child binding found in %s for %s.", childBindings, key);
return "";
} else {
return childBinding.getGetterMethodPackage();
}
}
public GinjectorBindings getChildBindings() {
return childBindings;
}
public SourceSnippet getCreationStatements(NameGenerator nameGenerator,
List<InjectorMethod> methodsOutput) throws NoSourceNameException {
String typeName = ReflectUtil.getSourceName(key.getTypeLiteral());
return new SourceSnippetBuilder()
.append(typeName).append(" result = ")
.append(SourceSnippets.callChildGetter(childBindings, key)).append(";")
.build();
}
public Collection<Dependency> getDependencies() {
// Don't need to do anything. The binding is positioned in an earlier stage of resolution.
return Collections.emptySet();
}
}