Source Code Cross Referenced for ResourceBundleThemeSource.java in  » J2EE » spring-framework-2.5 » org » springframework » ui » context » support » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » J2EE » spring framework 2.5 » org.springframework.ui.context.support 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright 2002-2007 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.ui.context.support;
018:
019:        import java.util.HashMap;
020:        import java.util.Iterator;
021:        import java.util.Map;
022:
023:        import org.apache.commons.logging.Log;
024:        import org.apache.commons.logging.LogFactory;
025:
026:        import org.springframework.context.HierarchicalMessageSource;
027:        import org.springframework.context.MessageSource;
028:        import org.springframework.context.support.ResourceBundleMessageSource;
029:        import org.springframework.ui.context.HierarchicalThemeSource;
030:        import org.springframework.ui.context.Theme;
031:        import org.springframework.ui.context.ThemeSource;
032:
033:        /**
034:         * {@link ThemeSource} implementation that looks up an individual
035:         * {@link java.util.ResourceBundle} per theme. The theme name gets
036:         * interpreted as ResourceBundle basename, supporting a common
037:         * basename prefix for all themes.
038:         *
039:         * @author Jean-Pierre Pawlak
040:         * @author Juergen Hoeller
041:         * @see #setBasenamePrefix
042:         * @see java.util.ResourceBundle
043:         * @see org.springframework.context.support.ResourceBundleMessageSource
044:         */
045:        public class ResourceBundleThemeSource implements 
046:                HierarchicalThemeSource {
047:
048:            protected final Log logger = LogFactory.getLog(getClass());
049:
050:            private ThemeSource parentThemeSource;
051:
052:            private String basenamePrefix = "";
053:
054:            /** Map from theme name to Theme instance */
055:            private final Map themeCache = new HashMap();
056:
057:            public void setParentThemeSource(ThemeSource parent) {
058:                this .parentThemeSource = parent;
059:
060:                // Update existing Theme objects.
061:                // Usually there shouldn't be any at the time of this call.
062:                synchronized (this .themeCache) {
063:                    Iterator it = this .themeCache.values().iterator();
064:                    while (it.hasNext()) {
065:                        initParent((Theme) it.next());
066:                    }
067:                }
068:            }
069:
070:            public ThemeSource getParentThemeSource() {
071:                return this .parentThemeSource;
072:            }
073:
074:            /**
075:             * Set the prefix that gets applied to the ResourceBundle basenames,
076:             * i.e. the theme names.
077:             * E.g.: basenamePrefix="test.", themeName="theme" -> basename="test.theme".
078:             * <p>Note that ResourceBundle names are effectively classpath locations: As a
079:             * consequence, the JDK's standard ResourceBundle treats dots as package separators.
080:             * This means that "test.theme" is effectively equivalent to "test/theme",
081:             * just like it is for programmatic <code>java.util.ResourceBundle</code> usage.
082:             * @see java.util.ResourceBundle#getBundle(String)
083:             */
084:            public void setBasenamePrefix(String basenamePrefix) {
085:                this .basenamePrefix = (basenamePrefix != null ? basenamePrefix
086:                        : "");
087:            }
088:
089:            /**
090:             * This implementation returns a SimpleTheme instance, holding a
091:             * ResourceBundle-based MessageSource whose basename corresponds to
092:             * the given theme name (prefixed by the configured "basenamePrefix").
093:             * <p>SimpleTheme instances are cached per theme name. Use a reloadable
094:             * MessageSource if themes should reflect changes to the underlying files.
095:             * @see #setBasenamePrefix
096:             * @see #createMessageSource
097:             */
098:            public Theme getTheme(String themeName) {
099:                if (themeName == null) {
100:                    return null;
101:                }
102:                synchronized (this .themeCache) {
103:                    Theme theme = (Theme) this .themeCache.get(themeName);
104:                    if (theme == null) {
105:                        String basename = this .basenamePrefix + themeName;
106:                        MessageSource messageSource = createMessageSource(basename);
107:                        theme = new SimpleTheme(themeName, messageSource);
108:                        initParent(theme);
109:                        this .themeCache.put(themeName, theme);
110:                        if (logger.isDebugEnabled()) {
111:                            logger.debug("Theme created: name '" + themeName
112:                                    + "', basename [" + basename + "]");
113:                        }
114:                    }
115:                    return theme;
116:                }
117:            }
118:
119:            /**
120:             * Create a MessageSource for the given basename,
121:             * to be used as MessageSource for the corresponding theme.
122:             * <p>Default implementation creates a ResourceBundleMessageSource.
123:             * for the given basename. A subclass could create a specifically
124:             * configured ReloadableResourceBundleMessageSource, for example.
125:             * @param basename the basename to create a MessageSource for
126:             * @return the MessageSource
127:             * @see org.springframework.context.support.ResourceBundleMessageSource
128:             * @see org.springframework.context.support.ReloadableResourceBundleMessageSource
129:             */
130:            protected MessageSource createMessageSource(String basename) {
131:                ResourceBundleMessageSource messageSource = new ResourceBundleMessageSource();
132:                messageSource.setBasename(basename);
133:                return messageSource;
134:            }
135:
136:            /**
137:             * Initialize the MessageSource of the given theme with the
138:             * one from the corresponding parent of this ThemeSource.
139:             * @param theme the Theme to (re-)initialize
140:             */
141:            protected void initParent(Theme theme) {
142:                if (theme.getMessageSource() instanceof  HierarchicalMessageSource) {
143:                    HierarchicalMessageSource messageSource = (HierarchicalMessageSource) theme
144:                            .getMessageSource();
145:                    if (getParentThemeSource() != null
146:                            && messageSource.getParentMessageSource() == null) {
147:                        Theme parentTheme = getParentThemeSource().getTheme(
148:                                theme.getName());
149:                        if (parentTheme != null) {
150:                            messageSource.setParentMessageSource(parentTheme
151:                                    .getMessageSource());
152:                        }
153:                    }
154:                }
155:            }
156:
157:        }
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