| // Copyright 2004 The Apache Software Foundation |
| // |
| // 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 org.apache.tapestry.wml; |
| |
| import java.io.OutputStream; |
| |
| import org.apache.tapestry.AbstractMarkupWriter; |
| import org.apache.tapestry.IMarkupWriter; |
| |
| /** |
| * This class is used to create WML output. |
| * |
| * <p>The <code>WMLResponseWriter</code> handles the necessary escaping |
| * of invalid characters. |
| * Specifically, the '$', '<', '>' and '&' characters are properly |
| * converted to their WML entities by the <code>print()</code> methods. |
| * Similar measures are taken by the {@link #attribute(String, String)} method. |
| * Other invalid characters are converted to their numeric entity equivalent. |
| * |
| * <p>This class makes it easy to generate trivial and non-trivial WML pages. |
| * It is also useful to generate WML snippets. It's ability to do simple |
| * formatting is very useful. A JSP may create an instance of the class |
| * and use it as an alternative to the simple-minded <b><%= ... %></b> |
| * construct, espcially because it can handle null more cleanly. |
| * |
| * @version $Id$ |
| * @author David Solis |
| * @since 0.2.9 |
| * |
| **/ |
| |
| public class WMLWriter extends AbstractMarkupWriter |
| { |
| |
| private static final String[] entities = new String[64]; |
| private static final boolean[] safe = new boolean[128]; |
| private static final String SAFE_CHARACTERS = |
| "01234567890" |
| + "abcdefghijklmnopqrstuvwxyz" |
| + "ABCDEFGHIJKLMNOPQRSTUVWXYZ" |
| + "\t\n\r !\"#%'()*+,-./:;=?@[\\]^_`{|}~"; |
| |
| static { |
| entities['"'] = """; |
| entities['<'] = "<"; |
| entities['>'] = ">"; |
| entities['&'] = "&"; |
| entities['$'] = "$$"; |
| |
| int length = SAFE_CHARACTERS.length(); |
| for (int i = 0; i < length; i++) |
| safe[SAFE_CHARACTERS.charAt(i)] = true; |
| } |
| |
| /** |
| * Creates a response writer for content type "text/vnd.wap.wml". |
| * |
| **/ |
| |
| public WMLWriter(OutputStream stream) |
| { |
| this(stream, "UTF-8"); |
| } |
| |
| /** |
| * |
| * @param stream the output stream where to write the text |
| * @param encoding the encoding to be used to generate the output |
| * @since 3.0 |
| * |
| **/ |
| public WMLWriter(OutputStream stream, String encoding) |
| { |
| this("text/vnd.wap.wml", encoding, stream); |
| } |
| |
| public WMLWriter(String contentType, OutputStream stream) |
| { |
| super(safe, entities, contentType, stream); |
| } |
| |
| /** |
| * |
| * @param mimeType the MIME type to be used to generate the content type |
| * @param encoding the encoding to be used to generate the output |
| * @param stream the output stream where to write the text |
| * @since 3.0 |
| * |
| **/ |
| public WMLWriter(String mimeType, String encoding, OutputStream stream) |
| { |
| super(safe, entities, mimeType, encoding, stream); |
| } |
| |
| protected WMLWriter(String contentType) |
| { |
| super(safe, entities, contentType); |
| } |
| |
| public IMarkupWriter getNestedWriter() |
| { |
| return new NestedWMLWriter(this); |
| } |
| } |