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/*
* Copyright (C) 2011 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.inject.spi;
import com.google.inject.Binder;
import com.google.inject.Binding;
import com.google.inject.Injector;
import com.google.inject.internal.util.StackTraceElements;
import java.lang.reflect.Member;
/**
* A combination of a {@link Dependency} and the {@link Binding#getSource()
* source} where the dependency was bound.
*
* @author sameb@google.com (Sam Berlin)
*/
public final class DependencyAndSource {
private final Dependency<?> dependency;
private final Object source;
public DependencyAndSource(Dependency<?> dependency, Object source) {
this.dependency = dependency;
this.source = source;
}
/**
* Returns the Dependency, if one exists. For anything that can be referenced
* by {@link Injector#getBinding}, a dependency exists. A dependency will not
* exist (and this will return null) for types initialized with
* {@link Binder#requestInjection} or {@link Injector#injectMembers(Object)},
* nor will it exist for objects injected into Providers bound with
* LinkedBindingBuilder#toProvider(Provider).
*/
public Dependency<?> getDependency() {
return dependency;
}
/**
* Returns a string describing where this dependency was bound. If the binding
* was just-in-time, there is no valid binding source, so this describes the
* class in question.
*/
public String getBindingSource() {
if (source instanceof Class) {
return StackTraceElements.forType((Class) source).toString();
} else if (source instanceof Member) {
return StackTraceElements.forMember((Member) source).toString();
} else {
return source.toString();
}
}
@Override
public String toString() {
Dependency<?> dep = getDependency();
Object source = getBindingSource();
if (dep != null) {
return "Dependency: " + dep + ", source: " + source;
} else {
return "Source: " + source;
}
}
}
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