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TypeKindVisitor8.java
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TypeKindVisitor8.java
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/*
* Copyright (c) 2011, 2017, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package javax.lang.model.util;
import javax.annotation.processing.SupportedSourceVersion;
import javax.lang.model.SourceVersion;
import javax.lang.model.type.*;
import static javax.lang.model.SourceVersion.*;
/**
* A visitor of types based on their {@linkplain TypeKind kind} with
* default behavior appropriate for the {@link SourceVersion#RELEASE_8
* RELEASE_8} source version. For {@linkplain
* TypeMirror types} <code><i>Xyz</i></code> that may have more than one
* kind, the <code>visit<i>Xyz</i></code> methods in this class delegate
* to the <code>visit<i>Xyz</i>As<i>Kind</i></code> method corresponding to the
* first argument's kind. The <code>visit<i>Xyz</i>As<i>Kind</i></code> methods
* call {@link #defaultAction defaultAction}, passing their arguments
* to {@code defaultAction}'s corresponding parameters.
*
* <p> Methods in this class may be overridden subject to their
* general contract. Note that annotating methods in concrete
* subclasses with {@link java.lang.Override @Override} will help
* ensure that methods are overridden as intended.
*
* <p> <b>WARNING:</b> The {@code TypeVisitor} interface implemented
* by this class may have methods added to it in the future to
* accommodate new, currently unknown, language structures added to
* future versions of the Java™ programming language.
* Therefore, methods whose names begin with {@code "visit"} may be
* added to this class in the future; to avoid incompatibilities,
* classes which extend this class should not declare any instance
* methods with names beginning with {@code "visit"}.
*
* <p>When such a new visit method is added, the default
* implementation in this class will be to call the {@link
* #visitUnknown visitUnknown} method. A new type kind visitor class
* will also be introduced to correspond to the new language level;
* this visitor will have different default behavior for the visit
* method in question. When the new visitor is introduced, all or
* portions of this visitor may be deprecated.
*
* @param <R> the return type of this visitor's methods. Use {@link
* Void} for visitors that do not need to return results.
* @param <P> the type of the additional parameter to this visitor's
* methods. Use {@code Void} for visitors that do not need an
* additional parameter.
*
* @see TypeKindVisitor6
* @see TypeKindVisitor7
* @since 1.8
*/
// 类型访问器的细化版本(JDK8)
@SupportedSourceVersion(RELEASE_8)
public class TypeKindVisitor8<R, P> extends TypeKindVisitor7<R, P> {
/**
* Constructor for concrete subclasses to call; uses {@code null}
* for the default value.
*/
protected TypeKindVisitor8() {
super(null);
}
/**
* Constructor for concrete subclasses to call; uses the argument
* for the default value.
*
* @param defaultValue the value to assign to {@link #DEFAULT_VALUE}
*/
protected TypeKindVisitor8(R defaultValue) {
super(defaultValue);
}
/**
* {@inheritDoc}
*
* @param t {@inheritDoc}
* @param p {@inheritDoc}
*
* @return the result of {@code defaultAction}
*
* @implSpec This implementation calls {@code defaultAction}.
*/
@Override
public R visitIntersection(IntersectionType t, P p) {
return defaultAction(t, p);
}
}