MultiBindingScannerFeature.java

package org.nnsoft.guice.autobind.scanner.features;

/*
 *    Copyright 2012 The 99 Software Foundation
 *
 *    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.
 */

import static com.google.inject.multibindings.Multibinder.newSetBinder;

import java.lang.annotation.Annotation;

import org.nnsoft.guice.autobind.scanner.ScannerModule;

import com.google.inject.binder.ScopedBindingBuilder;
import com.google.inject.multibindings.Multibinder;

/**
 * Default Implementation for Annotation Listeners, which should stay informed
 * abbout found annotated classes. Due the fact, that we need the Binder of the
 * Child Injector, it will be set at runtime by the {@link ScannerModule}.
 */
public abstract class MultiBindingScannerFeature
    extends BindingScannerFeature
{

    protected <T, V extends T> void bindInstance( V impl, Class<T> interf, Annotation annotation,
                                                  Class<? extends Annotation> scope )
    {
        Multibinder<T> builder;
        synchronized ( _binder )
        {
            if ( annotation != null )
            {
                builder = newSetBinder( _binder, interf, annotation );
            }
            else
            {
                builder = newSetBinder( _binder, interf );
            }

            builder.addBinding().toInstance( impl );
        }
    }

    protected void bindConstant( String value, Annotation annotation )
    {
        Multibinder<String> builder;
        synchronized ( _binder )
        {
            builder = newSetBinder( _binder, String.class, annotation );
            builder.addBinding().toInstance( value );
        }
    }

    protected <T, V extends T> void bind( Class<V> impl, Class<T> interf, Annotation annotation,
                                          Class<? extends Annotation> scope )
    {
        Multibinder<T> builder;
        synchronized ( _binder )
        {
            if ( annotation != null )
            {
                builder = newSetBinder( _binder, interf, annotation );
            }
            else
            {
                builder = newSetBinder( _binder, interf );
            }

            ScopedBindingBuilder scopedBindingBuilder = builder.addBinding().to( impl );
            if ( scope != null )
            {
                scopedBindingBuilder.in( scope );
            }
        }
    }

}