| /* |
| * Copyright 2006 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.core.ext; |
| |
| /** |
| * Generates source code for subclasses during deferred binding requests. |
| * Subclasses must be thread-safe. |
| */ |
| public abstract class Generator { |
| |
| /** |
| * Escapes string content to be a valid string literal. |
| * |
| * @return an escaped version of <code>unescaped</code>, suitable for being |
| * enclosed in double quotes in Java source |
| */ |
| public static String escape(String unescaped) { |
| int extra = 0; |
| for (int in = 0, n = unescaped.length(); in < n; ++in) { |
| switch (unescaped.charAt(in)) { |
| case '\0': |
| case '\n': |
| case '\r': |
| case '\"': |
| case '\\': |
| ++extra; |
| break; |
| } |
| } |
| |
| if (extra == 0) { |
| return unescaped; |
| } |
| |
| char[] oldChars = unescaped.toCharArray(); |
| char[] newChars = new char[oldChars.length + extra]; |
| for (int in = 0, out = 0, n = oldChars.length; in < n; ++in, ++out) { |
| char c = oldChars[in]; |
| switch (c) { |
| case '\0': |
| newChars[out++] = '\\'; |
| c = '0'; |
| break; |
| case '\n': |
| newChars[out++] = '\\'; |
| c = 'n'; |
| break; |
| case '\r': |
| newChars[out++] = '\\'; |
| c = 'r'; |
| break; |
| case '\"': |
| newChars[out++] = '\\'; |
| c = '"'; |
| break; |
| case '\\': |
| newChars[out++] = '\\'; |
| c = '\\'; |
| break; |
| } |
| newChars[out] = c; |
| } |
| |
| return String.valueOf(newChars); |
| } |
| |
| /** |
| * Generate a default constructible subclass of the requested type. The |
| * generator throws <code>UnableToCompleteException</code> if for any reason |
| * it cannot provide a substitute class |
| * |
| * @return the name of a subclass to substitute for the requested class, or |
| * return <code>null</code> to cause the requested type itself to be |
| * used |
| * |
| */ |
| public abstract String generate(TreeLogger logger, GeneratorContext context, |
| String typeName) throws UnableToCompleteException; |
| } |