Source Code Cross Referenced for NamespacesScope.java in  » Web-Server » Rimfaxe-Web-Server » org » apache » xerces » utils » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Web Server » Rimfaxe Web Server » org.apache.xerces.utils 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * The Apache Software License, Version 1.1
003:         *
004:         *
005:         * Copyright (c) 1999 The Apache Software Foundation.  All rights 
006:         * reserved.
007:         *
008:         * Redistribution and use in source and binary forms, with or without
009:         * modification, are permitted provided that the following conditions
010:         * are met:
011:         *
012:         * 1. Redistributions of source code must retain the above copyright
013:         *    notice, this list of conditions and the following disclaimer. 
014:         *
015:         * 2. Redistributions in binary form must reproduce the above copyright
016:         *    notice, this list of conditions and the following disclaimer in
017:         *    the documentation and/or other materials provided with the
018:         *    distribution.
019:         *
020:         * 3. The end-user documentation included with the redistribution,
021:         *    if any, must include the following acknowledgment:  
022:         *       "This product includes software developed by the
023:         *        Apache Software Foundation (http://www.apache.org/)."
024:         *    Alternately, this acknowledgment may appear in the software itself,
025:         *    if and wherever such third-party acknowledgments normally appear.
026:         *
027:         * 4. The names "Xerces" and "Apache Software Foundation" must
028:         *    not be used to endorse or promote products derived from this
029:         *    software without prior written permission. For written 
030:         *    permission, please contact apache@apache.org.
031:         *
032:         * 5. Products derived from this software may not be called "Apache",
033:         *    nor may "Apache" appear in their name, without prior written
034:         *    permission of the Apache Software Foundation.
035:         *
036:         * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
037:         * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
038:         * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
039:         * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
040:         * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
041:         * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
042:         * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
043:         * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
044:         * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
045:         * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
046:         * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
047:         * SUCH DAMAGE.
048:         * ====================================================================
049:         *
050:         * This software consists of voluntary contributions made by many
051:         * individuals on behalf of the Apache Software Foundation and was
052:         * originally based on software copyright (c) 1999, International
053:         * Business Machines, Inc., http://www.apache.org.  For more
054:         * information on the Apache Software Foundation, please see
055:         * <http://www.apache.org/>.
056:         */
057:
058:        package org.apache.xerces.utils;
059:
060:        /**
061:         * NamespacesScope provides a data structure for mapping namespace prefixes
062:         * to their URI's.  The mapping accurately reflects the scoping of namespaces
063:         * at a particular instant in time.
064:         */
065:        public class NamespacesScope {
066:            /**
067:             * NamespacesHandler allows a client to be notified when namespace scopes change
068:             */
069:            public interface NamespacesHandler {
070:                /**
071:                 * startNamespaceDeclScope is called when a new namespace scope is created
072:                 *
073:                 * @param prefix the StringPool handle of the namespace prefix being declared
074:                 * @param uri the StringPool handle of the namespace's URI
075:                 * @exception java.lang.Exception
076:                 */
077:                public void startNamespaceDeclScope(int prefix, int uri)
078:                        throws Exception;
079:
080:                /**
081:                 * endNamespaceDeclScope is called when a namespace scope ends
082:                 * 
083:                 * @param prefix the StringPool handle of the namespace prefix going out of scope
084:                 * @exception java.lang.Exception
085:                 */
086:                public void endNamespaceDeclScope(int prefix) throws Exception;
087:            }
088:
089:            public NamespacesScope() {
090:                this (new NamespacesHandler() {
091:                    public void startNamespaceDeclScope(int prefix, int uri)
092:                            throws Exception {
093:                    }
094:
095:                    public void endNamespaceDeclScope(int prefix)
096:                            throws Exception {
097:                    }
098:                });
099:            }
100:
101:            public NamespacesScope(NamespacesHandler handler) {
102:                fHandler = handler;
103:                fNamespaceMappings[0] = new int[9];
104:                fNamespaceMappings[0][0] = 1;
105:            }
106:
107:            public NamespacesScope(NamespacesHandler handler, int elemDepth,
108:                    int[][] map) {
109:                fHandler = handler;
110:                fElementDepth = elemDepth;
111:                if (map == null) {
112:                    fNamespaceMappings = new int[8][];
113:                    return;
114:                }
115:                fNamespaceMappings = new int[map.length][];
116:                for (int i = 0; i <= fElementDepth; i++) {
117:                    if (map[i] != null) {
118:                        fNamespaceMappings[i] = new int[map[i].length];
119:                        System.arraycopy(map[i], 0, fNamespaceMappings[i], 0,
120:                                map[i].length);
121:                    }
122:                }
123:            }
124:
125:            /**
126:             * set the namespace URI for given prefix
127:             *
128:             * @param prefix the StringPool handler of the prefix
129:             * @param namespace the StringPool handle of the namespace URI
130:             */
131:            public void setNamespaceForPrefix(int prefix, int namespace)
132:                    throws Exception {
133:                int offset = fNamespaceMappings[fElementDepth][0];
134:                if (offset == fNamespaceMappings[fElementDepth].length) {
135:                    int[] newMappings = new int[offset + 8];
136:                    System.arraycopy(fNamespaceMappings[fElementDepth], 0,
137:                            newMappings, 0, offset);
138:                    fNamespaceMappings[fElementDepth] = newMappings;
139:                }
140:                fNamespaceMappings[fElementDepth][offset++] = prefix;
141:                fNamespaceMappings[fElementDepth][offset++] = namespace;
142:                fNamespaceMappings[fElementDepth][0] = offset;
143:                if (fElementDepth > 0)
144:                    fHandler.startNamespaceDeclScope(prefix, namespace);
145:            }
146:
147:            /**
148:             * retreive the namespace URI for a prefix
149:             *
150:             * @param prefix the StringPool handle of the prefix
151:             */
152:            public int getNamespaceForPrefix(int prefix) {
153:                for (int depth = fElementDepth; depth >= 0; depth--) {
154:                    int offset = fNamespaceMappings[depth][0];
155:                    for (int i = 1; i < offset; i += 2) {
156:                        if (prefix == fNamespaceMappings[depth][i]) {
157:                            return fNamespaceMappings[depth][i + 1];
158:                        }
159:                    }
160:                }
161:                return StringPool.EMPTY_STRING;
162:            }
163:
164:            /**
165:             *  Add a new namespace mapping
166:             */
167:            public void increaseDepth() throws Exception {
168:                fElementDepth++;
169:                if (fElementDepth == fNamespaceMappings.length) {
170:                    int[][] newMappings = new int[fElementDepth + 8][];
171:                    System.arraycopy(fNamespaceMappings, 0, newMappings, 0,
172:                            fElementDepth);
173:                    fNamespaceMappings = newMappings;
174:                }
175:                if (fNamespaceMappings[fElementDepth] == null)
176:                    fNamespaceMappings[fElementDepth] = new int[9];
177:                fNamespaceMappings[fElementDepth][0] = 1;
178:            }
179:
180:            /**
181:             *  Remove a namespace mappng
182:             */
183:            public void decreaseDepth() throws Exception {
184:                if (fElementDepth > 0) {
185:                    int offset = fNamespaceMappings[fElementDepth][0];
186:                    while (offset > 1) {
187:                        offset -= 2;
188:                        fHandler
189:                                .endNamespaceDeclScope(fNamespaceMappings[fElementDepth][offset]);
190:                    }
191:                }
192:                fElementDepth--;
193:            }
194:
195:            // Object methods:
196:            public Object clone() {
197:                return new NamespacesScope(fHandler, fElementDepth,
198:                        fNamespaceMappings);
199:            } // end clone()
200:
201:            private NamespacesHandler fHandler = null;
202:            private int fElementDepth = 0;
203:            private int[][] fNamespaceMappings = new int[8][];
204:        }
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