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/*
* Copyright (c) 2005, 2014, 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.tree.*;
/**
* A simple visitor for tree nodes.
*
* @param the return type of this visitor's methods. Use {@link
* Void} for visitors that do not need to return results.
* @param the type of the additional parameter to this visitor's
* methods. Use {@code Void} for visitors that do not need an
* additional parameter.
*
* @author Peter von der Ahé
* @since 1.6
*/
public class SimpleTreeVisitor implements TreeVisitor {
/**
* 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 SimpleTreeVisitor() {
DEFAULT_VALUE = null;
}
/**
* Creates a visitor, with a specified DEFAULT_VALUE.
* @param defaultValue the default value to be returned by the default action.
*/
protected SimpleTreeVisitor(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(Tree 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(Tree 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 nodes, P p) {
R r = null;
if (nodes != null)
for (Tree 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 visitCompilationUnit(CompilationUnitTree 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 visitPackage(PackageTree 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 visitImport(ImportTree 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 visitClass(ClassTree 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 visitMethod(MethodTree 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 visitVariable(VariableTree 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 visitEmptyStatement(EmptyStatementTree 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 visitBlock(BlockTree 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 visitDoWhileLoop(DoWhileLoopTree 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 visitWhileLoop(WhileLoopTree 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 visitForLoop(ForLoopTree 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 visitEnhancedForLoop(EnhancedForLoopTree 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 visitLabeledStatement(LabeledStatementTree 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 visitSwitch(SwitchTree 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 visitCase(CaseTree 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 visitSynchronized(SynchronizedTree 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 visitTry(TryTree 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 visitCatch(CatchTree 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 visitConditionalExpression(ConditionalExpressionTree 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 visitIf(IfTree 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 visitExpressionStatement(ExpressionStatementTree 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 visitBreak(BreakTree 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 visitContinue(ContinueTree 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 visitThrow(ThrowTree 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 visitAssert(AssertTree 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 visitMethodInvocation(MethodInvocationTree 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 visitNewClass(NewClassTree 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 visitNewArray(NewArrayTree 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 visitLambdaExpression(LambdaExpressionTree 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 visitParenthesized(ParenthesizedTree 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 visitAssignment(AssignmentTree 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 visitCompoundAssignment(CompoundAssignmentTree 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 visitUnary(UnaryTree 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 visitBinary(BinaryTree 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 visitTypeCast(TypeCastTree 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 visitInstanceOf(InstanceOfTree 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 visitArrayAccess(ArrayAccessTree 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 visitMemberSelect(MemberSelectTree 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 visitMemberReference(MemberReferenceTree 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 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 visitPrimitiveType(PrimitiveTypeTree 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 visitArrayType(ArrayTypeTree 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 visitParameterizedType(ParameterizedTypeTree 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 visitUnionType(UnionTypeTree 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 visitIntersectionType(IntersectionTypeTree 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 visitTypeParameter(TypeParameterTree 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 visitWildcard(WildcardTree 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 visitModifiers(ModifiersTree 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 visitAnnotation(AnnotationTree 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 visitAnnotatedType(AnnotatedTypeTree 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}
*/
@Override
public R visitOther(Tree node, P p) {
return defaultAction(node, p);
}
}