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Java example source code file (ScopeBindingProcessor.java)

This example Java source code file (ScopeBindingProcessor.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

abstractprocessor, annotation, boolean, class, override, scope, scopebinding, scopebindingprocessor

The ScopeBindingProcessor.java Java example source code

/**
 * 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.internal;

import static com.google.common.base.Preconditions.checkNotNull;

import com.google.inject.Scope;
import com.google.inject.spi.ScopeBinding;

import java.lang.annotation.Annotation;

/**
 * Handles {@code Binder.bindScope} commands.
 *
 * @author crazybob@google.com (Bob Lee)
 * @author jessewilson@google.com (Jesse Wilson)
 */
final class ScopeBindingProcessor extends AbstractProcessor {

  ScopeBindingProcessor(Errors errors) {
    super(errors);
  }

  @Override public Boolean visit(ScopeBinding command) {
    Scope scope = checkNotNull(command.getScope(), "scope");
    Class<? extends Annotation> annotationType = checkNotNull(command.getAnnotationType(), "annotation type");

    if (!Annotations.isScopeAnnotation(annotationType)) {
      errors.missingScopeAnnotation(annotationType);
      // Go ahead and bind anyway so we don't get collateral errors.
    }

    if (!Annotations.isRetainedAtRuntime(annotationType)) {
      errors.missingRuntimeRetention(annotationType);
      // Go ahead and bind anyway so we don't get collateral errors.
    }

    ScopeBinding existing = injector.state.getScopeBinding(annotationType);
    if (existing != null) {
      if (!scope.equals(existing.getScope())) {
        errors.duplicateScopes(existing, annotationType, scope);
      }
    } else {
      injector.state.putScopeBinding(annotationType, command);
    }

    return true;
  }
}

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