com.google.inject.spi.InjectionRequest Maven / Gradle / Ivy
/*
* Copyright (C) 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.inject.spi;
import static com.google.common.base.Preconditions.checkNotNull;
import com.google.common.base.Objects;
import com.google.inject.Binder;
import com.google.inject.ConfigurationException;
import com.google.inject.TypeLiteral;
import java.util.Set;
/**
* A request to inject the instance fields and methods of an instance. Requests are created
* explicitly in a module using {@link com.google.inject.Binder#requestInjection(Object)
* requestInjection()} statements:
*
*
* requestInjection(serviceInstance);
*
* @author [email protected] (Mike Ward)
* @since 2.0
*/
public final class InjectionRequest implements Element {
private final Object source;
private final TypeLiteral type;
private final T instance;
public InjectionRequest(Object source, TypeLiteral type, T instance) {
this.source = checkNotNull(source, "source");
this.type = checkNotNull(type, "type");
this.instance = instance;
}
@Override
public Object getSource() {
return source;
}
/**
* Returns the instance that injection is being requested on. This may be null for injection
* requests returned from an Injector, to allow the injector to reclaim memory.
*/
public T getInstance() {
return instance;
}
public TypeLiteral getType() {
return type;
}
/**
* Returns the instance methods and fields of {@code instance} that will be injected to fulfill
* this request.
*
* @return a possibly empty set of injection points. The set has a specified iteration order. All
* fields are returned and then all methods. Within the fields, supertype fields are returned
* before subtype fields. Similarly, supertype methods are returned before subtype methods.
* @throws ConfigurationException if there is a malformed injection point on the class of {@code
* instance}, such as a field with multiple binding annotations. The exception's {@link
* ConfigurationException#getPartialValue() partial value} is a {@code Set} of
* the valid injection points.
*/
public Set getInjectionPoints() throws ConfigurationException {
return InjectionPoint.forInstanceMethodsAndFields(type);
}
@Override
public R acceptVisitor(ElementVisitor visitor) {
return visitor.visit(this);
}
@Override
public void applyTo(Binder binder) {
binder.withSource(getSource()).requestInjection(type, instance);
}
@Override
public boolean equals(Object obj) {
return obj instanceof InjectionRequest
&& Objects.equal(((InjectionRequest) obj).instance, instance)
&& ((InjectionRequest) obj).type.equals(type)
&& ((InjectionRequest) obj).source.equals(source);
}
@Override
public int hashCode() {
return Objects.hashCode(type, source);
}
}