/*
* Copyright 2010 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package com.google.gwt.dev.jjs.impl;
import com.google.gwt.dev.jjs.ast.Context;
import com.google.gwt.dev.jjs.ast.JArrayType;
import com.google.gwt.dev.jjs.ast.JBinaryOperation;
import com.google.gwt.dev.jjs.ast.JCastOperation;
import com.google.gwt.dev.jjs.ast.JConditional;
import com.google.gwt.dev.jjs.ast.JConstructor;
import com.google.gwt.dev.jjs.ast.JGwtCreate;
import com.google.gwt.dev.jjs.ast.JMethod;
import com.google.gwt.dev.jjs.ast.JModVisitor;
import com.google.gwt.dev.jjs.ast.JNewArray;
import com.google.gwt.dev.jjs.ast.JType;
import com.google.gwt.dev.jjs.ast.JVariable;
/**
* A visitor that changes all JType references in the AST. Subclasses override
* {@link #remap(JType)} to replace all occurrences of one or more types with
* different types.
*/
public abstract class TypeRemapper extends JModVisitor {
@Override
public void endVisit(JBinaryOperation x, Context ctx) {
x.setType(remap(x.getType()));
}
@Override
public void endVisit(JCastOperation x, Context ctx) {
/*
* JCastOperation doesn't have a settable castType method, so need to create
* a new one and do a replacement. Use remap() instead of modRemap() since
* the ctx.replaceMe() will record a change.
*/
JType remapCastType = remap(x.getCastType());
if (remapCastType != x.getCastType()) {
JCastOperation newX = new JCastOperation(x.getSourceInfo(), remapCastType, x.getExpr());
ctx.replaceMe(newX);
}
}
@Override
public void endVisit(JConditional x, Context ctx) {
x.setType(modRemap(x.getType()));
}
@Override
public void endVisit(JConstructor x, Context ctx) {
x.setType(modRemap(x.getType()));
}
@Override
public void endVisit(JGwtCreate x, Context ctx) {
x.setType(modRemap(x.getType()));
}
@Override
public void endVisit(JMethod x, Context ctx) {
x.setType(modRemap(x.getType()));
}
@Override
public void endVisit(JNewArray x, Context ctx) {
x.setType((JArrayType) modRemap(x.getArrayType()));
}
@Override
public void endVisit(JVariable x, Context ctx) {
x.setType(modRemap(x.getType()));
}
/**
* Override to return a possibly-different type.
*
* @param type the original type
* @return a replacement type, which may be the original type
*/
protected abstract JType remap(JType type);
private JType modRemap(JType type) {
JType result = remap(type);
if (result != type) {
madeChanges();
}
return result;
}
}