com.cyclopsgroup.waterview.spi.ThemeManager.java Source code

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Here is the source code for com.cyclopsgroup.waterview.spi.ThemeManager.java

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/* ==========================================================================
 * Copyright 2002-2005 Cyclops Group Community
 * 
 * Licensed under the Open Software License, Version 2.1 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://opensource.org/licenses/osl-2.1.php
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 * =========================================================================
 */
package com.cyclopsgroup.waterview.spi;

import java.util.HashSet;
import java.util.Iterator;

import org.apache.avalon.framework.configuration.Configurable;
import org.apache.avalon.framework.configuration.Configuration;
import org.apache.avalon.framework.configuration.ConfigurationException;
import org.apache.commons.collections.CollectionUtils;
import org.apache.commons.lang.ArrayUtils;

/**
 * @author <a href="mailto:jiaqi.guo@gmail.com">Jiaqi Guo</a>
 * 
 * Theme manager
 */
public class ThemeManager implements Configurable {
    /** Role of this component*/
    public static final String ROLE = ThemeManager.class.getName();

    private String defaultThemeName;

    private HashSet themeProviders = new HashSet();

    /**
     * Overwrite or implement method configure()
     *
     * @see org.apache.avalon.framework.configuration.Configurable#configure(org.apache.avalon.framework.configuration.Configuration)
     */
    public void configure(Configuration conf) throws ConfigurationException {
        defaultThemeName = conf.getChild("default-theme").getValue("default");
    }

    /**
     * Get default theme
     *
     * @return Default theme
     */
    public Theme getDefaultTheme() {
        return getTheme(defaultThemeName);
    }

    /**
     * Default theme name
     *
     * @return Default themeName
     */
    public String getDefaultThemeName() {
        return defaultThemeName;
    }

    /**
     * Get theme
     *
     * @param themeName Theme name
     * @return Theme object
     */
    public Theme getTheme(String themeName) {
        Theme theme = null;
        for (Iterator i = themeProviders.iterator(); i.hasNext();) {
            ThemeProvider provider = (ThemeProvider) i.next();
            theme = provider.getTheme(themeName);
            if (theme != null) {
                break;
            }
        }
        return theme;
    }

    /**
     * Get all theme names
     *
     * @return Array of them names
     */
    public String[] getThemeNames() {
        HashSet names = new HashSet();
        for (Iterator i = themeProviders.iterator(); i.hasNext();) {
            ThemeProvider provider = (ThemeProvider) i.next();
            CollectionUtils.addAll(names, provider.getThemeNames());
        }
        return (String[]) names.toArray(ArrayUtils.EMPTY_STRING_ARRAY);
    }

    /**
     * Register theme provider
     *
     * @param provider Theme provider
     */
    public void registerThemeProvider(ThemeProvider provider) {
        themeProviders.add(provider);
    }
}