core/src/com/google/inject/name/Names.java

/**
 * Copyright (C) 2006 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.name;

import com.google.inject.Binder;
import com.google.inject.Key;
import java.util.Enumeration;
import java.util.Map;
import java.util.Properties;

/**
 * Utility methods for use with {@code @}{@link Named}.
 *
 * @author crazybob@google.com (Bob Lee)
 */
public class Names {

  private Names() {}

  /**
   * Creates a {@link Named} annotation with {@code name} as the value.
   */
  public static Named named(String name) {
    return new NamedImpl(name);
  }

  /**
   * Creates a constant binding to {@code @Named(key)} for each entry in
   * {@code properties}.
   */
  public static void bindProperties(Binder binder, Map<String, String> properties) {
    binder = binder.skipSources(Names.class);
    for (Map.Entry<String, String> entry : properties.entrySet()) {
      String key = entry.getKey();
      String value = entry.getValue();
      binder.bind(Key.get(String.class, new NamedImpl(key))).toInstance(value);
    }
  }

  /**
   * Creates a constant binding to {@code @Named(key)} for each property. This
   * method binds all properties including those inherited from 
   * {@link Properties#defaults defaults}.
   */
  public static void bindProperties(Binder binder, Properties properties) {
    binder = binder.skipSources(Names.class);

    // use enumeration to include the default properties
    for (Enumeration<?> e = properties.propertyNames(); e.hasMoreElements(); ) {
      String propertyName = (String) e.nextElement();
      String value = properties.getProperty(propertyName);
      binder.bind(Key.get(String.class, new NamedImpl(propertyName))).toInstance(value);
    }
  }
}