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* 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.tools.javac.tree;
import com.sun.tools.javac.util.*;
import com.sun.tools.javac.tree.JCTree.*;
/** A subclass of Tree.Visitor, this class defines
* a general tree translator pattern. Translation proceeds recursively in
* left-to-right order down a tree, constructing translated nodes by
* overwriting existing ones. There is one visitor method in this class
* for every possible kind of tree node. To obtain a specific
* translator, it suffices to override those visitor methods which
* do some interesting work. The translator class itself takes care of all
* navigational aspects.
*
* <p><b>This is NOT part of any supported API.
* If you write code that depends on this, you do so at your own risk.
* This code and its internal interfaces are subject to change or
* deletion without notice.</b>
*/
public class TreeTranslator extends JCTree.Visitor {
/** Visitor result field: a tree
*/
protected JCTree result;
/** Visitor method: Translate a single node.
*/
@SuppressWarnings("unchecked")
public <T extends JCTree> T translate(T tree) {
if (tree == null) {
return null;
} else {
tree.accept(this);
JCTree result = this.result;
this.result = null;
return (T)result; // XXX cast
}
}
/** Visitor method: translate a list of nodes.
*/
public <T extends JCTree> List<T> translate(List<T> trees) {
if (trees == null) return null;
for (List<T> l = trees; l.nonEmpty(); l = l.tail)
l.head = translate(l.head);
return trees;
}
/** Visitor method: translate a list of variable definitions.
*/
public List<JCVariableDecl> translateVarDefs(List<JCVariableDecl> trees) {
for (List<JCVariableDecl> l = trees; l.nonEmpty(); l = l.tail)
l.head = translate(l.head);
return trees;
}
/** Visitor method: translate a list of type parameters.
*/
public List<JCTypeParameter> translateTypeParams(List<JCTypeParameter> trees) {
for (List<JCTypeParameter> l = trees; l.nonEmpty(); l = l.tail)
l.head = translate(l.head);
return trees;
}
/** Visitor method: translate a list of case parts of switch statements.
*/
public List<JCCase> translateCases(List<JCCase> trees) {
for (List<JCCase> l = trees; l.nonEmpty(); l = l.tail)
l.head = translate(l.head);
return trees;
}
/** Visitor method: translate a list of catch clauses in try statements.
*/
public List<JCCatch> translateCatchers(List<JCCatch> trees) {
for (List<JCCatch> l = trees; l.nonEmpty(); l = l.tail)
l.head = translate(l.head);
return trees;
}
/** Visitor method: translate a list of catch clauses in try statements.
*/
public List<JCAnnotation> translateAnnotations(List<JCAnnotation> trees) {
for (List<JCAnnotation> l = trees; l.nonEmpty(); l = l.tail)
l.head = translate(l.head);
return trees;
}
/* ***************************************************************************
* Visitor methods
****************************************************************************/
public void visitTopLevel(JCCompilationUnit tree) {
tree.pid = translate(tree.pid);
tree.defs = translate(tree.defs);
result = tree;
}
public void visitImport(JCImport tree) {
tree.qualid = translate(tree.qualid);
result = tree;
}
public void visitClassDef(JCClassDecl tree) {
tree.mods = translate(tree.mods);
tree.typarams = translateTypeParams(tree.typarams);
tree.extending = translate(tree.extending);
tree.implementing = translate(tree.implementing);
tree.defs = translate(tree.defs);
result = tree;
}
public void visitMethodDef(JCMethodDecl tree) {
tree.mods = translate(tree.mods);
tree.restype = translate(tree.restype);
tree.typarams = translateTypeParams(tree.typarams);
tree.params = translateVarDefs(tree.params);
tree.thrown = translate(tree.thrown);
tree.body = translate(tree.body);
result = tree;
}
public void visitVarDef(JCVariableDecl tree) {
tree.mods = translate(tree.mods);
tree.vartype = translate(tree.vartype);
tree.init = translate(tree.init);
result = tree;
}
public void visitSkip(JCSkip tree) {
result = tree;
}
public void visitBlock(JCBlock tree) {
tree.stats = translate(tree.stats);
result = tree;
}
public void visitDoLoop(JCDoWhileLoop tree) {
tree.body = translate(tree.body);
tree.cond = translate(tree.cond);
result = tree;
}
public void visitWhileLoop(JCWhileLoop tree) {
tree.cond = translate(tree.cond);
tree.body = translate(tree.body);
result = tree;
}
public void visitForLoop(JCForLoop tree) {
tree.init = translate(tree.init);
tree.cond = translate(tree.cond);
tree.step = translate(tree.step);
tree.body = translate(tree.body);
result = tree;
}
public void visitForeachLoop(JCEnhancedForLoop tree) {
tree.var = translate(tree.var);
tree.expr = translate(tree.expr);
tree.body = translate(tree.body);
result = tree;
}
public void visitLabelled(JCLabeledStatement tree) {
tree.body = translate(tree.body);
result = tree;
}
public void visitSwitch(JCSwitch tree) {
tree.selector = translate(tree.selector);
tree.cases = translateCases(tree.cases);
result = tree;
}
public void visitCase(JCCase tree) {
tree.pat = translate(tree.pat);
tree.stats = translate(tree.stats);
result = tree;
}
public void visitSynchronized(JCSynchronized tree) {
tree.lock = translate(tree.lock);
tree.body = translate(tree.body);
result = tree;
}
public void visitTry(JCTry tree) {
tree.resources = translate(tree.resources);
tree.body = translate(tree.body);
tree.catchers = translateCatchers(tree.catchers);
tree.finalizer = translate(tree.finalizer);
result = tree;
}
public void visitCatch(JCCatch tree) {
tree.param = translate(tree.param);
tree.body = translate(tree.body);
result = tree;
}
public void visitConditional(JCConditional tree) {
tree.cond = translate(tree.cond);
tree.truepart = translate(tree.truepart);
tree.falsepart = translate(tree.falsepart);
result = tree;
}
public void visitIf(JCIf tree) {
tree.cond = translate(tree.cond);
tree.thenpart = translate(tree.thenpart);
tree.elsepart = translate(tree.elsepart);
result = tree;
}
public void visitExec(JCExpressionStatement tree) {
tree.expr = translate(tree.expr);
result = tree;
}
public void visitBreak(JCBreak tree) {
result = tree;
}
public void visitContinue(JCContinue tree) {
result = tree;
}
public void visitReturn(JCReturn tree) {
tree.expr = translate(tree.expr);
result = tree;
}
public void visitThrow(JCThrow tree) {
tree.expr = translate(tree.expr);
result = tree;
}
public void visitAssert(JCAssert tree) {
tree.cond = translate(tree.cond);
tree.detail = translate(tree.detail);
result = tree;
}
public void visitApply(JCMethodInvocation tree) {
tree.meth = translate(tree.meth);
tree.args = translate(tree.args);
result = tree;
}
public void visitNewClass(JCNewClass tree) {
tree.encl = translate(tree.encl);
tree.clazz = translate(tree.clazz);
tree.args = translate(tree.args);
tree.def = translate(tree.def);
result = tree;
}
public void visitNewArray(JCNewArray tree) {
tree.elemtype = translate(tree.elemtype);
tree.dims = translate(tree.dims);
tree.elems = translate(tree.elems);
result = tree;
}
public void visitParens(JCParens tree) {
tree.expr = translate(tree.expr);
result = tree;
}
public void visitAssign(JCAssign tree) {
tree.lhs = translate(tree.lhs);
tree.rhs = translate(tree.rhs);
result = tree;
}
public void visitAssignop(JCAssignOp tree) {
tree.lhs = translate(tree.lhs);
tree.rhs = translate(tree.rhs);
result = tree;
}
public void visitUnary(JCUnary tree) {
tree.arg = translate(tree.arg);
result = tree;
}
public void visitBinary(JCBinary tree) {
tree.lhs = translate(tree.lhs);
tree.rhs = translate(tree.rhs);
result = tree;
}
public void visitTypeCast(JCTypeCast tree) {
tree.clazz = translate(tree.clazz);
tree.expr = translate(tree.expr);
result = tree;
}
public void visitTypeTest(JCInstanceOf tree) {
tree.expr = translate(tree.expr);
tree.clazz = translate(tree.clazz);
result = tree;
}
public void visitIndexed(JCArrayAccess tree) {
tree.indexed = translate(tree.indexed);
tree.index = translate(tree.index);
result = tree;
}
public void visitSelect(JCFieldAccess tree) {
tree.selected = translate(tree.selected);
result = tree;
}
public void visitIdent(JCIdent tree) {
result = tree;
}
public void visitLiteral(JCLiteral tree) {
result = tree;
}
public void visitTypeIdent(JCPrimitiveTypeTree tree) {
result = tree;
}
public void visitTypeArray(JCArrayTypeTree tree) {
tree.elemtype = translate(tree.elemtype);
result = tree;
}
public void visitTypeApply(JCTypeApply tree) {
tree.clazz = translate(tree.clazz);
tree.arguments = translate(tree.arguments);
result = tree;
}
public void visitTypeUnion(JCTypeUnion tree) {
tree.alternatives = translate(tree.alternatives);
result = tree;
}
public void visitTypeParameter(JCTypeParameter tree) {
tree.bounds = translate(tree.bounds);
result = tree;
}
@Override
public void visitWildcard(JCWildcard tree) {
tree.kind = translate(tree.kind);
tree.inner = translate(tree.inner);
result = tree;
}
@Override
public void visitTypeBoundKind(TypeBoundKind tree) {
result = tree;
}
public void visitErroneous(JCErroneous tree) {
result = tree;
}
public void visitLetExpr(LetExpr tree) {
tree.defs = translateVarDefs(tree.defs);
tree.expr = translate(tree.expr);
result = tree;
}
public void visitModifiers(JCModifiers tree) {
tree.annotations = translateAnnotations(tree.annotations);
result = tree;
}
public void visitAnnotation(JCAnnotation tree) {
tree.annotationType = translate(tree.annotationType);
tree.args = translate(tree.args);
result = tree;
}
public void visitTree(JCTree tree) {
throw new AssertionError(tree);
}
}