| /* |
| * 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.javac; |
| |
| import com.google.gwt.dev.javac.typemodel.JClassType; |
| import com.google.gwt.dev.javac.typemodel.JGenericType; |
| import com.google.gwt.dev.javac.typemodel.JTypeParameter; |
| import com.google.gwt.dev.util.collect.HashMap; |
| import com.google.gwt.dev.util.collect.Maps; |
| |
| import java.util.LinkedList; |
| import java.util.Map; |
| |
| /** |
| * Handles lookup of type parameters, using a scope stack. |
| */ |
| public class TypeParameterLookup { |
| |
| private LinkedList<Map<String, JTypeParameter>> scopeStack = new LinkedList<Map<String, JTypeParameter>>(); |
| |
| public JTypeParameter lookup(String name) { |
| for (Map<String, JTypeParameter> scope : scopeStack) { |
| JTypeParameter result = scope.get(name); |
| if (result != null) { |
| return result; |
| } |
| } |
| return null; |
| } |
| |
| public void popScope() { |
| scopeStack.remove(); |
| } |
| |
| public void pushEnclosingScopes(JClassType type) { |
| if (type == null) { |
| return; |
| } |
| pushEnclosingScopes(type.getEnclosingType()); |
| JGenericType genericType = type.isGenericType(); |
| if (genericType != null) { |
| pushScope(genericType.getTypeParameters()); |
| } |
| } |
| |
| public void pushScope(JTypeParameter[] typeParams) { |
| // push empty scopes to keep pops in sync |
| scopeStack.addFirst(buildScope(typeParams)); |
| } |
| |
| private Map<String, JTypeParameter> buildScope(JTypeParameter[] typeParams) { |
| switch (typeParams.length) { |
| case 0: |
| return Maps.create(); |
| case 1: |
| return Maps.create(typeParams[0].getName(), typeParams[0]); |
| default: |
| Map<String, JTypeParameter> scope = new HashMap<String, JTypeParameter>(); |
| for (JTypeParameter typeParam : typeParams) { |
| scope.put(typeParam.getName(), typeParam); |
| } |
| return scope; |
| } |
| } |
| } |