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* Copyright (c) 2005, 2016, 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
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*/
package com.sun.source.util;
import com.sun.source.doctree.*;
/**
* A simple visitor for tree nodes.
*
* @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.
*
* @since 1.8
*/
public class SimpleDocTreeVisitor<R,P> implements DocTreeVisitor<R, P> {
/**
* The default value, returned by the {@link #defaultAction default action}.
*/
protected final R DEFAULT_VALUE;
/**
* Creates a visitor, with a DEFAULT_VALUE of {@code null}.
*/
protected SimpleDocTreeVisitor() {
DEFAULT_VALUE = null;
}
/**
* Creates a visitor, with a specified DEFAULT_VALUE.
* @param defaultValue the default value to be returned by the default action.
*/
protected SimpleDocTreeVisitor(R defaultValue) {
DEFAULT_VALUE = defaultValue;
}
/**
* The default action, used by all visit methods that are not overridden.
* @param node the node being visited
* @param p the parameter value passed to the visit method
* @return the result value to be returned from the visit method
*/
protected R defaultAction(DocTree node, P p) {
return DEFAULT_VALUE;
}
/**
* Invokes the appropriate visit method specific to the type of the node.
* @param node the node on which to dispatch
* @param p a parameter to be passed to the appropriate visit method
* @return the value returns from the appropriate visit method
*/
public final R visit(DocTree node, P p) {
return (node == null) ? null : node.accept(this, p);
}
/**
* Invokes the appropriate visit method on each of a sequence of nodes.
* @param nodes the nodes on which to dispatch
* @param p a parameter value to be passed to each appropriate visit method
* @return the value return from the last of the visit methods, or null
* if none were called.
*/
public final R visit(Iterable<? extends DocTree> nodes, P p) {
R r = null;
if (nodes != null) {
for (DocTree node : nodes)
r = visit(node, p);
}
return r;
}
/**
* {@inheritDoc} This implementation calls {@code defaultAction}.
*
* @param node {@inheritDoc}
* @param p {@inheritDoc}
* @return the result of {@code defaultAction}
*/
@Override
public R visitAttribute(AttributeTree node, P p) {
return defaultAction(node, p);
}
/**
* {@inheritDoc} This implementation calls {@code defaultAction}.
*
* @param node {@inheritDoc}
* @param p {@inheritDoc}
* @return the result of {@code defaultAction}
*/
@Override
public R visitAuthor(AuthorTree node, P p) {
return defaultAction(node, p);
}
/**
* {@inheritDoc} This implementation calls {@code defaultAction}.
*
* @param node {@inheritDoc}
* @param p {@inheritDoc}
* @return the result of {@code defaultAction}
*/
@Override
public R visitComment(CommentTree node, P p) {
return defaultAction(node, p);
}
/**
* {@inheritDoc} This implementation calls {@code defaultAction}.
*
* @param node {@inheritDoc}
* @param p {@inheritDoc}
* @return the result of {@code defaultAction}
*/
@Override
public R visitDeprecated(DeprecatedTree node, P p) {
return defaultAction(node, p);
}
/**
* {@inheritDoc} This implementation calls {@code defaultAction}.
*
* @param node {@inheritDoc}
* @param p {@inheritDoc}
* @return the result of {@code defaultAction}
*/
@Override
public R visitDocComment(DocCommentTree node, P p) {
return defaultAction(node, p);
}
/**
* {@inheritDoc} This implementation calls {@code defaultAction}.
*
* @param node {@inheritDoc}
* @param p {@inheritDoc}
* @return the result of {@code defaultAction}
*/
@Override
public R visitDocRoot(DocRootTree node, P p) {
return defaultAction(node, p);
}
/**
* {@inheritDoc} This implementation calls {@code defaultAction}.
*
* @param node {@inheritDoc}
* @param p {@inheritDoc}
* @return the result of {@code defaultAction}
*/
@Override
public R visitEndElement(EndElementTree node, P p) {
return defaultAction(node, p);
}
/**
* {@inheritDoc} This implementation calls {@code defaultAction}.
*
* @param node {@inheritDoc}
* @param p {@inheritDoc}
* @return the result of {@code defaultAction}
*/
@Override
public R visitEntity(EntityTree node, P p) {
return defaultAction(node, p);
}
/**
* {@inheritDoc} This implementation calls {@code defaultAction}.
*
* @param node {@inheritDoc}
* @param p {@inheritDoc}
* @return the result of {@code defaultAction}
*/
@Override
public R visitErroneous(ErroneousTree node, P p) {
return defaultAction(node, p);
}
/**
* {@inheritDoc} This implementation calls {@code defaultAction}.
*
* @param node {@inheritDoc}
* @param p {@inheritDoc}
* @return the result of {@code defaultAction}
*/
public R visitHidden(HiddenTree node, P p) {
return defaultAction(node, p);
}
/**
* {@inheritDoc} This implementation calls {@code defaultAction}.
*
* @param node {@inheritDoc}
* @param p {@inheritDoc}
* @return the result of {@code defaultAction}
*/
@Override
public R visitIdentifier(IdentifierTree node, P p) {
return defaultAction(node, p);
}
/**
* {@inheritDoc} This implementation calls {@code defaultAction}.
*
* @param node {@inheritDoc}
* @param p {@inheritDoc}
* @return the result of {@code defaultAction}
*/
@Override
public R visitIndex(IndexTree node, P p) {
return defaultAction(node, p);
}
/**
* {@inheritDoc} This implementation calls {@code defaultAction}.
*
* @param node {@inheritDoc}
* @param p {@inheritDoc}
* @return the result of {@code defaultAction}
*/
@Override
public R visitInheritDoc(InheritDocTree node, P p) {
return defaultAction(node, p);
}
/**
* {@inheritDoc} This implementation calls {@code defaultAction}.
*
* @param node {@inheritDoc}
* @param p {@inheritDoc}
* @return the result of {@code defaultAction}
*/
@Override
public R visitLink(LinkTree node, P p) {
return defaultAction(node, p);
}
/**
* {@inheritDoc} This implementation calls {@code defaultAction}.
*
* @param node {@inheritDoc}
* @param p {@inheritDoc}
* @return the result of {@code defaultAction}
*/
@Override
public R visitLiteral(LiteralTree node, P p) {
return defaultAction(node, p);
}
/**
* {@inheritDoc} This implementation calls {@code defaultAction}.
*
* @param node {@inheritDoc}
* @param p {@inheritDoc}
* @return the result of {@code defaultAction}
*/
@Override
public R visitParam(ParamTree node, P p) {
return defaultAction(node, p);
}
/**
* {@inheritDoc} This implementation calls {@code defaultAction}.
*
* @param node {@inheritDoc}
* @param p {@inheritDoc}
* @return the result of {@code defaultAction}
*/
@Override
public R visitReference(ReferenceTree node, P p) {
return defaultAction(node, p);
}
/**
* {@inheritDoc} This implementation calls {@code defaultAction}.
*
* @param node {@inheritDoc}
* @param p {@inheritDoc}
* @return the result of {@code defaultAction}
*/
@Override
public R visitReturn(ReturnTree node, P p) {
return defaultAction(node, p);
}
/**
* {@inheritDoc} This implementation calls {@code defaultAction}.
*
* @param node {@inheritDoc}
* @param p {@inheritDoc}
* @return the result of {@code defaultAction}
*/
@Override
public R visitSee(SeeTree node, P p) {
return defaultAction(node, p);
}
/**
* {@inheritDoc} This implementation calls {@code defaultAction}.
*
* @param node {@inheritDoc}
* @param p {@inheritDoc}
* @return the result of {@code defaultAction}
*/
@Override
public R visitSerial(SerialTree node, P p) {
return defaultAction(node, p);
}
/**
* {@inheritDoc} This implementation calls {@code defaultAction}.
*
* @param node {@inheritDoc}
* @param p {@inheritDoc}
* @return the result of {@code defaultAction}
*/
@Override
public R visitSerialData(SerialDataTree node, P p) {
return defaultAction(node, p);
}
/**
* {@inheritDoc} This implementation calls {@code defaultAction}.
*
* @param node {@inheritDoc}
* @param p {@inheritDoc}
* @return the result of {@code defaultAction}
*/
@Override
public R visitSerialField(SerialFieldTree node, P p) {
return defaultAction(node, p);
}
/**
* {@inheritDoc} This implementation calls {@code defaultAction}.
*
* @param node {@inheritDoc}
* @param p {@inheritDoc}
* @return the result of {@code defaultAction}
*/
@Override
public R visitSince(SinceTree node, P p) {
return defaultAction(node, p);
}
/**
* {@inheritDoc} This implementation calls {@code defaultAction}.
*
* @param node {@inheritDoc}
* @param p {@inheritDoc}
* @return the result of {@code defaultAction}
*/
@Override
public R visitStartElement(StartElementTree node, P p) {
return defaultAction(node, p);
}
/**
* {@inheritDoc} This implementation calls {@code defaultAction}.
*
* @param node {@inheritDoc}
* @param p {@inheritDoc}
* @return the result of {@code defaultAction}
*/
@Override
public R visitText(TextTree node, P p) {
return defaultAction(node, p);
}
/**
* {@inheritDoc} This implementation calls {@code defaultAction}.
*
* @param node {@inheritDoc}
* @param p {@inheritDoc}
* @return the result of {@code defaultAction}
*/
@Override
public R visitThrows(ThrowsTree node, P p) {
return defaultAction(node, p);
}
/**
* {@inheritDoc} This implementation calls {@code defaultAction}.
*
* @param node {@inheritDoc}
* @param p {@inheritDoc}
* @return the result of {@code defaultAction}
*/
@Override
public R visitUnknownBlockTag(UnknownBlockTagTree node, P p) {
return defaultAction(node, p);
}
/**
* {@inheritDoc} This implementation calls {@code defaultAction}.
*
* @param node {@inheritDoc}
* @param p {@inheritDoc}
* @return the result of {@code defaultAction}
*/
@Override
public R visitUnknownInlineTag(UnknownInlineTagTree node, P p) {
return defaultAction(node, p);
}
/**
* {@inheritDoc} This implementation calls {@code defaultAction}.
*
* @param node {@inheritDoc}
* @param p {@inheritDoc}
* @return the result of {@code defaultAction}
*/
@Override
public R visitValue(ValueTree node, P p) {
return defaultAction(node, p);
}
/**
* {@inheritDoc} This implementation calls {@code defaultAction}.
*
* @param node {@inheritDoc}
* @param p {@inheritDoc}
* @return the result of {@code defaultAction}
*/
@Override
public R visitVersion(VersionTree node, P p) {
return defaultAction(node, p);
}
/**
* {@inheritDoc} This implementation calls {@code defaultAction}.
*
* @param node {@inheritDoc}
* @param p {@inheritDoc}
* @return the result of {@code defaultAction}
*/
@Override
public R visitOther(DocTree node, P p) {
return defaultAction(node, p);
}
}