| /* |
| * Copyright 2009 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.ast; |
| |
| import com.google.gwt.dev.jjs.InternalCompilerException; |
| import com.google.gwt.dev.jjs.SourceInfo; |
| |
| /** |
| * An AST node whose evaluation results in the string name of its node. |
| */ |
| public class JNameOf extends JExpression { |
| |
| static boolean replacesNamedElement(JNode newElement, JNode oldElement) { |
| if (newElement instanceof JType) { |
| if (!((JType) newElement).replaces((JType) oldElement)) { |
| return false; |
| } |
| } else if (newElement instanceof JField) { |
| if (!((JField) newElement).replaces((JField) oldElement)) { |
| return false; |
| } |
| } else if (newElement instanceof JMethod) { |
| if (!((JMethod) newElement).replaces((JMethod) oldElement)) { |
| return false; |
| } |
| } else { |
| throw new InternalCompilerException("Unexpected node type."); |
| } |
| return true; |
| } |
| |
| private HasName node; |
| private JClassType stringType; |
| |
| public JNameOf(SourceInfo info, JClassType stringType, HasName node) { |
| super(info); |
| this.node = node; |
| this.stringType = stringType; |
| assert stringType.getName().equals("java.lang.String"); |
| } |
| |
| public HasName getNode() { |
| return node; |
| } |
| |
| @Override |
| public JReferenceType getType() { |
| return stringType.strengthenToNonNull(); |
| } |
| |
| @Override |
| public boolean hasSideEffects() { |
| return false; |
| } |
| |
| /** |
| * Resolve external references during AST stitching. |
| */ |
| public void resolve(HasName node, JClassType stringType) { |
| assert replacesNamedElement((JNode) node, (JNode) this.node); |
| this.node = node; |
| assert stringType.replaces(this.stringType); |
| this.stringType = stringType; |
| } |
| |
| @Override |
| public void traverse(JVisitor visitor, Context ctx) { |
| if (visitor.visit(this, ctx)) { |
| // Intentionally not visiting referenced node |
| } |
| visitor.endVisit(this, ctx); |
| } |
| } |