HTMLSerializer


1   /*
2    * Copyright 1999-2004 The Apache Software Foundation.
3    * 
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    * 
8    *      http://www.apache.org/licenses/LICENSE-2.0
9    * 
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  package org.apache.cocoon.components.serializers;
17  
18  import org.apache.cocoon.components.serializers.encoding.HTMLEncoder;
19  import org.apache.cocoon.components.serializers.util.DocType;
20  import org.apache.cocoon.components.serializers.util.SGMLDocType;
21  import org.xml.sax.SAXException  ;
22  
23  
24  /**
25   *
26   * @author <a HREF="mailto:pier@apache.org">Pier Fumagalli</a>, February 2003
27   * @version CVS $Id: HTMLSerializer.java 30932 2004-07-29 17:35:38Z vgritsenko $
28   */
29  public class HTMLSerializer extends XHTMLSerializer {
30  
31      /** A cross-browser compatible very simple document type declaration. */
32      public static final DocType HTML401_DOCTYPE_COMPATIBLE = new SGMLDocType(
33              "HTML", "-//W3C//DTD HTML 4.01 Transitional//EN", null);
34  
35      /** A representation of the HTML 4.01 strict document type. */
36      public static final DocType HTML401_DOCTYPE_STRICT = new SGMLDocType(
37              "HTML", "-//W3C//DTD HTML 4.01//EN",
38              "http://www.w3.org/TR/html4/strict.dtd");
39  
40      /** A representation of the HTML 4.01 transitional document type. */
41      public static final DocType HTML401_DOCTYPE_TRANSITIONAL = new SGMLDocType(
42              "HTML", "-//W3C//DTD HTML 4.01 Transitional//EN",
43              "http://www.w3.org/TR/html4/loose.dtd");
44  
45      /** A representation of the HTML 4.01 frameset document type. */
46      public static final DocType HTML401_DOCTYPE_FRAMESET = new SGMLDocType(
47              "HTML", "-//W3C//DTD HTML 4.01 Frameset//EN",
48              "http://www.w3.org/TR/html4/frameset.dtd");
49  
50      /* ====================================================================== */
51  
52      private static final HTMLEncoder HTML_ENCODER = new HTMLEncoder();
53  
54      /**
55       * Create a new instance of this <code>HTMLSerializer</code>
56       */
57      public HTMLSerializer() {
58          super(HTML_ENCODER);
59      }
60  
61      /* ====================================================================== */
62  
63      /** Empty namespaces declaration. */
64      private static final String   NAMESPACES[][] = new String  [0][0];
65  
66      /** Check if the URI is allowed by this serializer. */
67      private boolean checkNamespace(String   nsuri) {
68          if (nsuri.length() == 0) return(true);
69          if (XHTML1_NAMESPACE.equals(nsuri)) return(true);
70          return(false);
71      }
72  
73      /* ====================================================================== */
74  
75      /**
76       * Write the XML document header.
77       * <p>
78       * This method overrides the default <code>XMLSerializer</code>.behaviour.
79       * </p>
80       */
81      public void head()
82      throws SAXException   {
83          // NO NOTHING!
84      }
85  
86      /**
87       * Receive notification of the beginning of the document body.
88       *
89       * @param nsuri The namespace URI of the root element.
90       * @param local The local name of the root element.
91       * @param qual The fully-qualified name of the root element.
92       */
93      public void body(String   nsuri, String   local, String   qual)
94      throws SAXException   {
95          String   name = local.toUpperCase();
96          if (! this.checkNamespace(nsuri)) {
97              throw new SAXException  ("Unsupported namespace \"" + nsuri + "\" "
98                                     + "for HTML root element \"" + qual + "\""
99                                     + this.getLocation());
100         }
101 
102         if (this.doctype == null) {
103             this.doctype = HTML401_DOCTYPE_COMPATIBLE;
104         } else if (XHTML1_DOCTYPE_STRICT.equals(this.doctype)) {
105             this.doctype = HTML401_DOCTYPE_STRICT;
106         } else if (XHTML1_DOCTYPE_TRANSITIONAL.equals(this.doctype)) {
107             this.doctype = HTML401_DOCTYPE_TRANSITIONAL;
108         } else if (XHTML1_DOCTYPE_FRAMESET.equals(this.doctype)) {
109             this.doctype = HTML401_DOCTYPE_FRAMESET;
110         } else {
111             this.doctype = new DocType(this.doctype.getName().toUpperCase(),
112                                        this.doctype.getPublicId(),
113                                        this.doctype.getSystemId());
114         }
115         super.body(XHTML1_NAMESPACE, name, name);
116     }
117 
118 
119     /**
120      * Receive notification of the beginning of an element.
121      */
122     public void startElementImpl(String   nsuri, String   local, String   qual,
123                              String   namespaces[][], String   attributes[][])
124     throws SAXException   {
125         String   name = local.toUpperCase();
126         if (! this.checkNamespace(nsuri)) {
127             throw new SAXException  ("Unsupported namespace \"" + nsuri + "\" "
128                                    + "for HTML element \"" + qual + "\""
129                                    + this.getLocation());
130         }
131 
132         int length = 0;
133         for (int x = 0; x < attributes.length; x ++) {
134             if (checkNamespace(attributes[x][ATTRIBUTE_NSURI])) length ++;
135         }
136 
137         String   at[][] = new String  [length][ATTRIBUTE_LENGTH];
138         length = 0;
139         for (int x = 0; x < attributes.length; x ++) {
140             if (!checkNamespace(attributes[x][ATTRIBUTE_NSURI])) continue;
141 
142             String   at_name = attributes[x][ATTRIBUTE_LOCAL].toLowerCase();
143             at[length][ATTRIBUTE_NSURI] = XHTML1_NAMESPACE;
144             at[length][ATTRIBUTE_LOCAL] = at_name;
145             at[length][ATTRIBUTE_QNAME] = at_name;
146             at[length][ATTRIBUTE_VALUE] = attributes[x][ATTRIBUTE_VALUE];
147             length++;
148         }
149 
150         super.startElementImpl(XHTML1_NAMESPACE, name, name, NAMESPACES, at);
151     }
152 
153     /**
154      * Receive notification of the end of an element.
155      */
156     public void endElementImpl(String   nsuri, String   local, String   qual)
157     throws SAXException   {
158         this.closeElement(false);
159 
160         String   name = local.toUpperCase();
161         if (! this.checkNamespace(nsuri)) {
162             throw new SAXException  ("Unsupported namespace \"" + nsuri + "\" "
163                                    + "for HTML element \"" + qual + "\""
164                                    + this.getLocation());
165         }
166 
167         if (name.equals("AREA")) return;
168         if (name.equals("BASE")) return;
169         if (name.equals("BASEFONT")) return;
170         if (name.equals("BR")) return;
171         if (name.equals("COL")) return;
172         if (name.equals("FRAME")) return;
173         if (name.equals("HR")) return;
174         if (name.equals("IMG")) return;
175         if (name.equals("INPUT")) return;
176         if (name.equals("ISINDEX")) return;
177         if (name.equals("LINK")) return;
178         if (name.equals("META")) return;
179         if (name.equals("PARAM")) return;
180 
181         super.endElementImpl(XHTML1_NAMESPACE, name, name);
182     }
183 }
184
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