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Java example source code file (UntargettedBindingProcessor.java)

This example Java source code file (UntargettedBindingProcessor.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

abstractbindingprocessor, bindingimpl, boolean, errorsexception, override, processedbindingdata, untargettedbindingprocessor

The UntargettedBindingProcessor.java Java example source code

/**
 * 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.internal;

import com.google.inject.Binding;
import com.google.inject.spi.UntargettedBinding;

/**
 * Processes just UntargettedBindings.
 *
 * @author sameb@google.com (Sam Berlin)
 */
class UntargettedBindingProcessor extends AbstractBindingProcessor {
  
  UntargettedBindingProcessor(Errors errors, ProcessedBindingData bindingData) {
    super(errors, bindingData);
  }
  
  @Override
  public <T> Boolean visit(Binding binding) {
    return binding.acceptTargetVisitor(new Processor<T, Boolean>((BindingImpl)binding) {  
      public Boolean visit(UntargettedBinding<? extends T> untargetted) {
        prepareBinding();

        // Error: Missing implementation.
        // Example: bind(Date.class).annotatedWith(Red.class);
        // We can't assume abstract types aren't injectable. They may have an
        // @ImplementedBy annotation or something.
        if (key.getAnnotationType() != null) {
          errors.missingImplementation(key);
          putBinding(invalidBinding(injector, key, source));
          return true;
        }
    
        // This cast is safe after the preceeding check.
        try {
          BindingImpl<T> binding = injector.createUninitializedBinding(
              key, scoping, source, errors, false);
          scheduleInitialization(binding);
          putBinding(binding);
        } catch (ErrorsException e) {
          errors.merge(e.getErrors());
          putBinding(invalidBinding(injector, key, source));
        }
    
        return true;
      }
      
      @Override
      protected Boolean visitOther(Binding<? extends T> binding) {
        return false;
      }
    });
  }
}

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