Source Code Cross Referenced for BuiltinVariable.java in  » Template-Engine » freemarker-2.3.10 » freemarker » core » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Template Engine » freemarker 2.3.10 » freemarker.core 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright (c) 2003 The Visigoth Software Society. All rights
003:         * reserved.
004:         *
005:         * Redistribution and use in source and binary forms, with or without
006:         * modification, are permitted provided that the following conditions
007:         * are met:
008:         *
009:         * 1. Redistributions of source code must retain the above copyright
010:         *    notice, this list of conditions and the following disclaimer.
011:         *
012:         * 2. Redistributions in binary form must reproduce the above copyright
013:         *    notice, this list of conditions and the following disclaimer in
014:         *    the documentation and/or other materials provided with the
015:         *    distribution.
016:         *
017:         * 3. The end-user documentation included with the redistribution, if
018:         *    any, must include the following acknowledgement:
019:         *       "This product includes software developed by the
020:         *        Visigoth Software Society (http://www.visigoths.org/)."
021:         *    Alternately, this acknowledgement may appear in the software itself,
022:         *    if and wherever such third-party acknowledgements normally appear.
023:         *
024:         * 4. Neither the name "FreeMarker", "Visigoth", nor any of the names of the
025:         *    project contributors may be used to endorse or promote products derived
026:         *    from this software without prior written permission. For written
027:         *    permission, please contact visigoths@visigoths.org.
028:         *
029:         * 5. Products derived from this software may not be called "FreeMarker" or "Visigoth"
030:         *    nor may "FreeMarker" or "Visigoth" appear in their names
031:         *    without prior written permission of the Visigoth Software Society.
032:         *
033:         * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
034:         * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
035:         * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
036:         * DISCLAIMED.  IN NO EVENT SHALL THE VISIGOTH SOFTWARE SOCIETY OR
037:         * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
038:         * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
039:         * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
040:         * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
041:         * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
042:         * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
043:         * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
044:         * SUCH DAMAGE.
045:         * ====================================================================
046:         *
047:         * This software consists of voluntary contributions made by many
048:         * individuals on behalf of the Visigoth Software Society. For more
049:         * information on the Visigoth Software Society, please see
050:         * http://www.visigoths.org/
051:         */
052:
053:        package freemarker.core;
054:
055:        import freemarker.template.*;
056:
057:        /**
058:         * A reference to a built-in identifier, such as .root
059:         */
060:        final class BuiltinVariable extends Expression {
061:
062:            static final String NAMESPACE = "namespace";
063:            static final String MAIN = "main";
064:            static final String GLOBALS = "globals";
065:            static final String LOCALS = "locals";
066:            static final String DATA_MODEL = "data_model";
067:            static final String LANG = "lang";
068:            static final String LOCALE = "locale";
069:            static final String CURRENT_NODE = "current_node";
070:            static final String NODE = "node";
071:            static final String PASS = "pass";
072:            static final String VARS = "vars";
073:            static final String VERSION = "version";
074:            static final String ERROR = "error";
075:            static final String OUTPUT_ENCODING = "output_encoding";
076:            static final String URL_ESCAPING_CHARSET = "url_escaping_charset";
077:
078:            private final String name;
079:
080:            BuiltinVariable(String name) throws ParseException {
081:                name = name.intern();
082:                this .name = name;
083:                if (name != NAMESPACE && name != MAIN && name != GLOBALS
084:                        && name != LOCALS && name != LANG && name != LOCALE
085:                        && name != DATA_MODEL && name != CURRENT_NODE
086:                        && name != NODE && name != PASS && name != VARS
087:                        && name != VERSION && name != OUTPUT_ENCODING
088:                        && name != URL_ESCAPING_CHARSET && name != ERROR) {
089:                    throw new ParseException("Unknown built-in variable: "
090:                            + name, this );
091:                }
092:            }
093:
094:            TemplateModel _getAsTemplateModel(Environment env)
095:                    throws TemplateException {
096:                if (name == NAMESPACE) {
097:                    return env.getCurrentNamespace();
098:                }
099:                if (name == MAIN) {
100:                    return env.getMainNamespace();
101:                }
102:                if (name == GLOBALS) {
103:                    return env.getGlobalVariables();
104:                }
105:                if (name == LOCALS) {
106:                    return env.getCurrentMacroContext().getLocals();
107:                }
108:                if (name == DATA_MODEL) {
109:                    return env.getDataModel();
110:                }
111:                if (name == VARS) {
112:                    return new VarsHash(env);
113:                }
114:                if (name == LOCALE) {
115:                    return new SimpleScalar(env.getLocale().toString());
116:                }
117:                if (name == LANG) {
118:                    return new SimpleScalar(env.getLocale().getLanguage());
119:                }
120:                if (name == CURRENT_NODE || name == NODE) {
121:                    return env.getCurrentVisitorNode();
122:                }
123:                if (name == PASS) {
124:                    return Macro.DO_NOTHING_MACRO;
125:                }
126:                if (name == VERSION) {
127:                    return new SimpleScalar(Configuration.getVersionNumber());
128:                }
129:                if (name == OUTPUT_ENCODING) {
130:                    String s = env.getOutputEncoding();
131:                    return s != null ? new SimpleScalar(s) : null;
132:                }
133:                if (name == URL_ESCAPING_CHARSET) {
134:                    String s = env.getURLEscapingCharset();
135:                    return s != null ? new SimpleScalar(s) : null;
136:                }
137:                if (name == ERROR) {
138:                    return new SimpleScalar(env
139:                            .getCurrentRecoveredErrorMesssage());
140:                }
141:                throw new TemplateException("Invalid built-in variable: "
142:                        + this , env);
143:            }
144:
145:            public String toString() {
146:                return "." + name;
147:            }
148:
149:            public String getCanonicalForm() {
150:                return "." + name;
151:            }
152:
153:            boolean isLiteral() {
154:                return false;
155:            }
156:
157:            Expression _deepClone(String name, Expression subst) {
158:                return this ;
159:            }
160:
161:            class VarsHash implements  TemplateHashModel {
162:
163:                Environment env;
164:
165:                VarsHash(Environment env) {
166:                    this .env = env;
167:                }
168:
169:                public TemplateModel get(String key)
170:                        throws TemplateModelException {
171:                    return env.getVariable(key);
172:                }
173:
174:                public boolean isEmpty() {
175:                    return false;
176:                }
177:            }
178:        }
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