Source Code Cross Referenced for HtmlCharacterEntityReferences.java in  » J2EE » spring-framework-2.0.6 » org » springframework » web » util » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » J2EE » spring framework 2.0.6 » org.springframework.web.util 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright 2002-2005 the original author or authors.
003:         *
004:         * Licensed under the Apache License, Version 2.0 (the "License");
005:         * you may not use this file except in compliance with the License.
006:         * You may obtain a copy of the License at
007:         *
008:         *      http://www.apache.org/licenses/LICENSE-2.0
009:         *
010:         * Unless required by applicable law or agreed to in writing, software
011:         * distributed under the License is distributed on an "AS IS" BASIS,
012:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013:         * See the License for the specific language governing permissions and
014:         * limitations under the License.
015:         */
016:
017:        package org.springframework.web.util;
018:
019:        import java.io.IOException;
020:        import java.io.InputStream;
021:        import java.util.Enumeration;
022:        import java.util.HashMap;
023:        import java.util.Map;
024:        import java.util.Properties;
025:
026:        import org.springframework.util.Assert;
027:
028:        /**
029:         * Represents a set of character entity references defined by the
030:         * HTML 4.0 standard.
031:         *
032:         * <p>A complete description of the HTML 4.0 character set can be found
033:         * at http://www.w3.org/TR/html4/charset.html.
034:         *
035:         * @author Juergen Hoeller
036:         * @author Martin Kersten
037:         * @since 1.2.1
038:         */
039:        class HtmlCharacterEntityReferences {
040:
041:            static final char REFERENCE_START = '&';
042:
043:            static final String DECIMAL_REFERENCE_START = "&#";
044:
045:            static final String HEX_REFERENCE_START = "&#x";
046:
047:            static final char REFERENCE_END = ';';
048:
049:            static final char CHAR_NULL = (char) -1;
050:
051:            private static final String PROPERTIES_FILE = "HtmlCharacterEntityReferences.properties";
052:
053:            private final String[] characterToEntityReferenceMap = new String[3000];
054:
055:            private final Map entityReferenceToCharacterMap = new HashMap(252);
056:
057:            /**
058:             * Returns a new set of character entity references reflecting the HTML 4.0 character set.
059:             */
060:            public HtmlCharacterEntityReferences() {
061:                Properties entityReferences = new Properties();
062:
063:                // Load refeence definition file.
064:                InputStream is = HtmlCharacterEntityReferences.class
065:                        .getResourceAsStream(PROPERTIES_FILE);
066:                if (is == null) {
067:                    throw new IllegalStateException(
068:                            "Cannot find reference definition file [HtmlCharacterEntityReferences.properties] as class path resource");
069:                }
070:                try {
071:                    try {
072:                        entityReferences.load(is);
073:                    } finally {
074:                        is.close();
075:                    }
076:                } catch (IOException ex) {
077:                    throw new IllegalStateException(
078:                            "Failed to parse reference definition file [HtmlCharacterEntityReferences.properties]: "
079:                                    + ex.getMessage());
080:                }
081:
082:                // Parse reference definition properites.
083:                Enumeration keys = entityReferences.propertyNames();
084:                while (keys.hasMoreElements()) {
085:                    String key = (String) keys.nextElement();
086:                    int referredChar = Integer.parseInt(key);
087:                    Assert
088:                            .isTrue(
089:                                    (referredChar < 1000 || (referredChar >= 8000 && referredChar < 10000)),
090:                                    "Invalid reference to special HTML entity: "
091:                                            + referredChar);
092:                    int index = (referredChar < 1000 ? referredChar
093:                            : referredChar - 7000);
094:                    String reference = entityReferences.getProperty(key);
095:                    this .characterToEntityReferenceMap[index] = REFERENCE_START
096:                            + reference + REFERENCE_END;
097:                    this .entityReferenceToCharacterMap.put(reference,
098:                            new Character((char) referredChar));
099:                }
100:            }
101:
102:            /**
103:             * Return the number of supported entity references.
104:             */
105:            public int getSupportedReferenceCount() {
106:                return this .entityReferenceToCharacterMap.size();
107:            }
108:
109:            /**
110:             * Return true if the given character is mapped to a supported entity reference.
111:             */
112:            public boolean isMappedToReference(char character) {
113:                return (convertToReference(character) != null);
114:            }
115:
116:            /**
117:             * Return the reference mapped to the given character or <code>null</code>.
118:             */
119:            public String convertToReference(char character) {
120:                if (character < 1000
121:                        || (character >= 8000 && character < 10000)) {
122:                    int index = (character < 1000 ? character
123:                            : character - 7000);
124:                    String entityReference = this .characterToEntityReferenceMap[index];
125:                    if (entityReference != null) {
126:                        return entityReference;
127:                    }
128:                }
129:                return null;
130:            }
131:
132:            /**
133:             * Return the char mapped to the given entityReference or -1.
134:             */
135:            public char convertToCharacter(String entityReference) {
136:                Character referredCharacter = (Character) this.entityReferenceToCharacterMap
137:                        .get(entityReference);
138:                if (referredCharacter != null) {
139:                    return referredCharacter.charValue();
140:                }
141:                return CHAR_NULL;
142:            }
143:
144:        }
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