/* SimpleTypeVisitor7.java -- A simple visitor implementation for 1.7.
   Copyright (C) 2015  Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
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General Public License for more details.

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02110-1301 USA.

Linking this library statically or dynamically with other modules is
making a combined work based on this library.  Thus, the terms and
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As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent
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package javax.lang.model.util;

import javax.annotation.processing.SupportedSourceVersion;

import javax.lang.model.SourceVersion;

import javax.lang.model.type.UnionType;

/**
 * <p>A simple implementation of {@link TypeVisitor} for the
 * 1.7 version of the Java programming language
 * ({@link SourceVersion#RELEASE_7}).  Each {@code visitXYZ} method
 * redirects to {@code defaultAction(type, parameter)}.
 * Implementors may extend this class and provide alternative
 * implementations of {@link #defaultAction(TypeMirror, P)} and
 * the {@code visitXYZ} methods as appropriate.</p>
 * <p>As the interface this class implements may be extended in future,
 * in order to support later language versions, methods beginning with
 * the phrase {@code "visit"} should be avoided in subclasses.  This
 * class itself will be extended to direct these new methods to the
 * {@link #visitUnknown(TypeMirror,P)} method and a new class will be
 * added to provide implementations for the new language version.
 * At this time, all or some of this class may be deprecated.</p>
 * 
 * @param <R> the return type of the visitor's methods.  {@code Void}
 *            can be used where there is no return value.
 * @param <P> the type of the additional parameter supplied to the visitor's
 *            methods.
 *
 * @author Andrew John Hughes (gnu_andrew@member.fsf.org)
 * @since 1.7
 */
@SupportedSourceVersion(SourceVersion.RELEASE_7)
public class SimpleTypeVisitor7<R,P> extends SimpleTypeVisitor6<R,P>
{

  /**
   * Constructs a new {@link SimpleTypeVisitor7} with a {@code null}
   * default value.
   */
  protected SimpleTypeVisitor7()
  {
    this(null);
  }

  /**
   * Constructs a new {@link SimpleTypeVisitor7} with the specified
   * default value.
   *
   * @param defaultValue the value to assign to {@link #DEFAULT_VALUE}.
   */
  protected SimpleTypeVisitor7(R defaultValue)
  {
    super(defaultValue);
  }

  /**
   * Visits a UnionType instance.  This implementation simply
   * calls {@code defaultAction(type, parameter)}.
   *
   * @param type the UnionType instance to visit.
   * @param parameter the additional parameter, specific to the visitor.
   *        May be {@code null}.
   * @return the result of {@code defaultAction(type, parameter)}.
   */
  @Override
  public R visitUnion(UnionType type, P parameter)
  {
    return defaultAction(type, parameter);
  }

}