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Java example source code file (Element.java)

This example Java source code file (Element.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

element, object

The Element.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.spi;

import com.google.inject.Binder;

/**
 * A core component of a module or injector.
 *
 * <p>The elements of a module can be inspected, validated and rewritten. Use {@link
 * Elements#getElements(com.google.inject.Module[]) Elements.getElements()} to read the elements
 * from a module, and {@link Elements#getModule(Iterable) Elements.getModule()} to rewrite them.
 * This can be used for static analysis and generation of Guice modules.
 *
 * <p>The elements of an injector can be inspected and exercised. Use {@link
 * com.google.inject.Injector#getBindings Injector.getBindings()} to reflect on Guice injectors.
 *
 * @author jessewilson@google.com (Jesse Wilson)
 * @author crazybob@google.com (Bob Lee)
 * @since 2.0
 */
public interface Element {

  /**
   * Returns an arbitrary object containing information about the "place" where this element was
   * configured. Used by Guice in the production of descriptive error messages.
   *
   * <p>Tools might specially handle types they know about; {@code StackTraceElement} is a good
   * example. Tools should simply call {@code toString()} on the source object if the type is
   * unfamiliar.
   */
  Object getSource();

  /**
   * Accepts an element visitor. Invokes the visitor method specific to this element's type.
   *
   * @param visitor to call back on
   */
  <T> T acceptVisitor(ElementVisitor visitor);

  /**
   * Writes this module element to the given binder (optional operation).
   *
   * @param binder to apply configuration element to
   * @throws UnsupportedOperationException if the {@code applyTo} method is not supported by this
   *     element.
   */
  void applyTo(Binder binder);

}

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