Source Code Cross Referenced for HTMLSerializer.java in  » Content-Management-System » apache-lenya-2.0 » org » apache » cocoon » components » serializers » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Content Management System » apache lenya 2.0 » org.apache.cocoon.components.serializers 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Licensed to the Apache Software Foundation (ASF) under one or more
003:         * contributor license agreements.  See the NOTICE file distributed with
004:         * this work for additional information regarding copyright ownership.
005:         * The ASF licenses this file to You under the Apache License, Version 2.0
006:         * (the "License"); you may not use this file except in compliance with
007:         * the License.  You may obtain a copy of the License at
008:         *
009:         *      http://www.apache.org/licenses/LICENSE-2.0
010:         *
011:         * Unless required by applicable law or agreed to in writing, software
012:         * distributed under the License is distributed on an "AS IS" BASIS,
013:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014:         * See the License for the specific language governing permissions and
015:         * limitations under the License.
016:         */
017:        package org.apache.cocoon.components.serializers;
018:
019:        import org.apache.avalon.framework.configuration.Configuration;
020:        import org.apache.avalon.framework.configuration.ConfigurationException;
021:        import org.apache.cocoon.components.serializers.encoding.HTMLEncoder;
022:        import org.apache.cocoon.components.serializers.util.DocType;
023:        import org.apache.cocoon.components.serializers.util.SGMLDocType;
024:        import org.xml.sax.SAXException;
025:
026:        /**
027:         * <p>A serializer converting XHTML into plain old HTML.</p>
028:         *
029:         * <p>For configuration options of this serializer, please look at the
030:         * {@link XHTMLSerializer} and {@link EncodingSerializer}.</p>
031:         *
032:         * <p>Any of the XHTML document type declared or used will be converted into
033:         * its HTML 4.01 counterpart, and in addition to those a "compatible" doctype
034:         * can be supported to exploit a couple of shortcuts into MSIE's rendering
035:         * engine. The values for the <code>doctype-default</code> can then be:</p>
036:         *
037:         * <dl>
038:         *   <dt>"<code>none</code>"</dt>
039:         *   <dd>Not to emit any dococument type declaration.</dd>
040:         *   <dt>"<code>compatible</code>"</dt>
041:         *   <dd>The HTML 4.01 Transitional (exploiting MSIE shortcut).</dd>
042:         *   <dt>"<code>strict</code>"</dt>
043:         *   <dd>The HTML 4.01 Strict document type.</dd>
044:         *   <dt>"<code>loose</code>"</dt>
045:         *   <dd>The HTML 4.01 Transitional document type.</dd>
046:         *   <dt>"<code>frameset</code>"</dt>
047:         *   <dd>The HTML 4.01 Frameset document type.</dd>
048:         * </dl>
049:         *
050:         * @version CVS $Id: HTMLSerializer.java 515096 2007-03-06 12:11:29Z cziegeler $
051:         */
052:        public class HTMLSerializer extends XHTMLSerializer {
053:
054:            /** A cross-browser compatible very simple document type declaration. */
055:            public static final DocType HTML401_DOCTYPE_COMPATIBLE = new SGMLDocType(
056:                    "HTML", "-//W3C//DTD HTML 4.01 Transitional//EN", null);
057:
058:            /** A representation of the HTML 4.01 strict document type. */
059:            public static final DocType HTML401_DOCTYPE_STRICT = new SGMLDocType(
060:                    "HTML", "-//W3C//DTD HTML 4.01//EN",
061:                    "http://www.w3.org/TR/html4/strict.dtd");
062:
063:            /** A representation of the HTML 4.01 transitional document type. */
064:            public static final DocType HTML401_DOCTYPE_TRANSITIONAL = new SGMLDocType(
065:                    "HTML", "-//W3C//DTD HTML 4.01 Transitional//EN",
066:                    "http://www.w3.org/TR/html4/loose.dtd");
067:
068:            /** A representation of the HTML 4.01 frameset document type. */
069:            public static final DocType HTML401_DOCTYPE_FRAMESET = new SGMLDocType(
070:                    "HTML", "-//W3C//DTD HTML 4.01 Frameset//EN",
071:                    "http://www.w3.org/TR/html4/frameset.dtd");
072:
073:            /* ====================================================================== */
074:
075:            private static final HTMLEncoder HTML_ENCODER = new HTMLEncoder();
076:
077:            protected boolean encodeCharacters = true;
078:
079:            /**
080:             * Create a new instance of this <code>HTMLSerializer</code>
081:             */
082:            public HTMLSerializer() {
083:                super (HTML_ENCODER);
084:            }
085:
086:            /**
087:             * Configure this instance by selecting the default document type to use.
088:             */
089:            public void configure(Configuration conf)
090:                    throws ConfigurationException {
091:                super .configure(conf);
092:
093:                String doctype = conf.getChild("doctype-default")
094:                        .getValue(null);
095:                if ("none".equalsIgnoreCase(doctype)) {
096:                    this .doctype_default = null;
097:                } else if ("compatible".equalsIgnoreCase(doctype)) {
098:                    this .doctype_default = HTML401_DOCTYPE_COMPATIBLE;
099:                } else if ("strict".equalsIgnoreCase(doctype)) {
100:                    this .doctype_default = HTML401_DOCTYPE_STRICT;
101:                } else if ("loose".equalsIgnoreCase(doctype)) {
102:                    this .doctype_default = HTML401_DOCTYPE_TRANSITIONAL;
103:                } else if ("frameset".equalsIgnoreCase(doctype)) {
104:                    this .doctype_default = HTML401_DOCTYPE_FRAMESET;
105:                } else {
106:                    /* Default is compatible (MSIE hack) */
107:                    this .doctype_default = HTML401_DOCTYPE_COMPATIBLE;
108:                }
109:            }
110:
111:            /* ====================================================================== */
112:
113:            /** Empty namespaces declaration. */
114:            private static final String NAMESPACES[][] = new String[0][0];
115:
116:            /** Check if the URI is allowed by this serializer. */
117:            private boolean checkNamespace(String nsuri) {
118:                if (nsuri.length() == 0)
119:                    return (true);
120:                if (XHTML1_NAMESPACE.equals(nsuri))
121:                    return (true);
122:                return (false);
123:            }
124:
125:            /* ====================================================================== */
126:
127:            /**
128:             * Write the XML document header.
129:             * <p>
130:             * This method overrides the default <code>XMLSerializer</code>.behaviour.
131:             * </p>
132:             */
133:            public void head() throws SAXException {
134:                // NO NOTHING!
135:            }
136:
137:            /**
138:             * Receive notification of the beginning of the document body.
139:             *
140:             * @param nsuri The namespace URI of the root element.
141:             * @param local The local name of the root element.
142:             * @param qual The fully-qualified name of the root element.
143:             */
144:            public void body(String nsuri, String local, String qual)
145:                    throws SAXException {
146:                String name = local.toUpperCase();
147:                if (!this .checkNamespace(nsuri)) {
148:                    throw new SAXException("Unsupported namespace \"" + nsuri
149:                            + "\" " + "for HTML root element \"" + qual + "\""
150:                            + this .getLocation());
151:                }
152:
153:                if (this .doctype == null)
154:                    this .doctype = this .doctype_default;
155:
156:                if (XHTML1_DOCTYPE_STRICT.equals(this .doctype)) {
157:                    this .doctype = HTML401_DOCTYPE_STRICT;
158:                } else if (XHTML1_DOCTYPE_TRANSITIONAL.equals(this .doctype)) {
159:                    this .doctype = HTML401_DOCTYPE_TRANSITIONAL;
160:                } else if (XHTML1_DOCTYPE_FRAMESET.equals(this .doctype)) {
161:                    this .doctype = HTML401_DOCTYPE_FRAMESET;
162:                } else if (this .doctype != null) {
163:                    /* The root element is uppercase, always!!! */
164:                    this .doctype = new SGMLDocType(this .doctype.getName()
165:                            .toUpperCase(), this .doctype.getPublicId(),
166:                            this .doctype.getSystemId());
167:                }
168:                super .body(XHTML1_NAMESPACE, name, name);
169:            }
170:
171:            /**
172:             * Receive notification of the beginning of an element.
173:             */
174:            public void startElementImpl(String nsuri, String local,
175:                    String qual, String namespaces[][], String attributes[][])
176:                    throws SAXException {
177:                String name = local.toUpperCase();
178:                if (!this .checkNamespace(nsuri)) {
179:                    throw new SAXException("Unsupported namespace \"" + nsuri
180:                            + "\" " + "for HTML element \"" + qual + "\""
181:                            + this .getLocation());
182:                }
183:
184:                int length = 0;
185:                for (int x = 0; x < attributes.length; x++) {
186:                    if (checkNamespace(attributes[x][ATTRIBUTE_NSURI]))
187:                        length++;
188:                }
189:
190:                String at[][] = new String[length][ATTRIBUTE_LENGTH];
191:                length = 0;
192:                for (int x = 0; x < attributes.length; x++) {
193:                    if (!checkNamespace(attributes[x][ATTRIBUTE_NSURI]))
194:                        continue;
195:
196:                    String at_name = attributes[x][ATTRIBUTE_LOCAL]
197:                            .toLowerCase();
198:                    at[length][ATTRIBUTE_NSURI] = XHTML1_NAMESPACE;
199:                    at[length][ATTRIBUTE_LOCAL] = at_name;
200:                    at[length][ATTRIBUTE_QNAME] = at_name;
201:                    at[length][ATTRIBUTE_VALUE] = attributes[x][ATTRIBUTE_VALUE];
202:                    length++;
203:                }
204:
205:                // script and style are CDATA sections by default, so no encoding
206:                if ("SCRIPT".equals(name) || "STYLE".equals(name)) {
207:                    this .encodeCharacters = false;
208:                }
209:                super .startElementImpl(XHTML1_NAMESPACE, name, name,
210:                        NAMESPACES, at);
211:            }
212:
213:            /**
214:             * Receive notification of the end of an element.
215:             */
216:            public void endElementImpl(String nsuri, String local, String qual)
217:                    throws SAXException {
218:                this .closeElement(false);
219:
220:                String name = local.toUpperCase();
221:                if (!this .checkNamespace(nsuri)) {
222:                    throw new SAXException("Unsupported namespace \"" + nsuri
223:                            + "\" " + "for HTML element \"" + qual + "\""
224:                            + this .getLocation());
225:                }
226:
227:                if (name.equals("AREA"))
228:                    return;
229:                if (name.equals("BASE"))
230:                    return;
231:                if (name.equals("BASEFONT"))
232:                    return;
233:                if (name.equals("BR"))
234:                    return;
235:                if (name.equals("COL"))
236:                    return;
237:                if (name.equals("FRAME"))
238:                    return;
239:                if (name.equals("HR"))
240:                    return;
241:                if (name.equals("IMG"))
242:                    return;
243:                if (name.equals("INPUT"))
244:                    return;
245:                if (name.equals("ISINDEX"))
246:                    return;
247:                if (name.equals("LINK"))
248:                    return;
249:                if (name.equals("META"))
250:                    return;
251:                if (name.equals("PARAM"))
252:                    return;
253:
254:                // script and style are CDATA sections by default, so no encoding
255:                if ("SCRIPT".equals(name) || "STYLE".equals(name)) {
256:                    this .encodeCharacters = true;
257:                }
258:                super .endElementImpl(XHTML1_NAMESPACE, name, name);
259:            }
260:
261:            /**
262:             * Encode and write a specific part of an array of characters.
263:             */
264:            protected void encode(char data[], int start, int length)
265:                    throws SAXException {
266:                if (!this.encodeCharacters) {
267:                    this.write(data, start, length);
268:                    return;
269:                }
270:                super.encode(data, start, length);
271:            }
272:        }
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