src/com/google/inject/internal/Keys.java

/**
 * 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 com.google.inject.Key;
import com.google.inject.BindingAnnotation;

import java.lang.reflect.Type;
import java.lang.reflect.Member;
import java.lang.annotation.Annotation;

public class Keys {

  /**
   * Gets a key for the given type, member and annotations.
   */
  public static Key<?> get(Type type, Member member, Annotation[] annotations,
      ErrorHandler errorHandler) {
    Annotation found = null;
    for (Annotation annotation : annotations) {
      if (annotation.annotationType().getAnnotation(BindingAnnotation.class) != null) {
        if (found == null) {
          found = annotation;
        } else {
          errorHandler.handle(StackTraceElements.forMember(member),
              ErrorMessages.DUPLICATE_BINDING_ANNOTATIONS, found, annotation);
        }
      }
    }
    return found == null ? Key.get(type) : Key.get(type, found);
  }
}