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/*
 *
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 * 
 * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
 * 
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License. You can obtain
 * a copy of the License at https://jersey.dev.java.net/CDDL+GPL.html
 * or jersey/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 * 
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at jersey/legal/LICENSE.txt.
 * Sun designates this particular file as subject to the "Classpath" exception
 * as provided by Sun in the GPL Version 2 section of the License file that
 * accompanied this code.  If applicable, add the following below the License
 * Header, with the fields enclosed by brackets [] replaced by your own
 * identifying information: "Portions Copyrighted [year]
 * [name of copyright owner]"
 * 
 * Contributor(s):
 * 
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 */

package com.sun.jersey.server.impl.provider;

import java.util.ArrayList;
import java.util.List;
import java.util.Locale;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Variant;
import javax.ws.rs.core.Variant.VariantListBuilder;

/**
 *
 * @author [email protected]
 */
public class VariantListBuilderImpl extends Variant.VariantListBuilder {

    private List variants;
    
    private final List mediaTypes = new ArrayList();
    
    private final List languages = new ArrayList();
   
    private final List charsets = new ArrayList();
    
    private final List encodings = new ArrayList();
    
    @Override
    public List build() {
        if (variants == null)
            variants = new ArrayList();
        
        return variants;
    }

    @Override
    public VariantListBuilder add() {
        if (variants == null)
            variants = new ArrayList();

        addMediaTypes();
        
        charsets.clear();
        languages.clear();
        encodings.clear();
        mediaTypes.clear();

        return this;
    }

    private void addMediaTypes() {
        if (mediaTypes.isEmpty()) addLanguages(null);
        else for (MediaType mediaType : mediaTypes) addLanguages(mediaType);        
    }
    
    private void addLanguages(MediaType mediaType) {
        if (languages.isEmpty()) addEncodings(mediaType, null);
        else for (Locale language : languages) addEncodings(mediaType, language);        
    }
    
    private void addEncodings(MediaType mediaType, Locale language) {
        if (encodings.isEmpty()) addVariant(mediaType, language, null);
        else for (String encoding : encodings) addVariant(mediaType, language, encoding);        
    }

    private void addVariant(MediaType mediaType, Locale language, String encoding) {
        variants.add(new Variant(mediaType, language, encoding));
    }
    
    @Override
    public VariantListBuilder languages(Locale... languages) {
        for (Locale language : languages) this.languages.add(language);
        return this;
    }

    @Override
    public VariantListBuilder encodings(String... encodings) {
        for (String encoding : encodings) this.encodings.add(encoding);
        return this;
    }

    @Override
    public VariantListBuilder mediaTypes(MediaType... mediaTypes) {
        for (MediaType mediaType : mediaTypes) this.mediaTypes.add(mediaType);
        return this;
    }
}