de.mpg.escidoc.services.cone.util.RdfHelper.java Source code

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Here is the source code for de.mpg.escidoc.services.cone.util.RdfHelper.java

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/*
*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at license/ESCIDOC.LICENSE
* or http://www.escidoc.org/license.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at license/ESCIDOC.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/

/*
* Copyright 2006-2012 Fachinformationszentrum Karlsruhe Gesellschaft
* fr wissenschaftlich-technische Information mbH and Max-Planck-
* Gesellschaft zur Frderung der Wissenschaft e.V.
* All rights reserved. Use is subject to license terms.
*/

package de.mpg.escidoc.services.cone.util;

import java.io.StringWriter;
import java.util.List;

import org.apache.commons.lang3.StringEscapeUtils;

import de.mpg.escidoc.services.cone.ModelList.Model;
import de.mpg.escidoc.services.framework.PropertyReader;

/**
 * Static Helper class for RDF formatting.
 *
 * @author franke (initial creation)
 * @author $Author$ (last modification)
 * @version $Revision$ $LastChangedDate$
 *
 */
public class RdfHelper {

    private RdfHelper() {

    }

    /**
     * Formats an List<Pair> into an RDF list.
     * 
     * @param pairs A list of key-value pairs
     * 
     * @return The RDF
     */
    public static String formatList(List<? extends Describable> pairs, Model model) {

        StringWriter result = new StringWriter();

        result.append("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n");
        result.append("<rdf:RDF xmlns:rdf=\"http://www.w3.org/1999/02/22-rdf-syntax-ns#\" "
                + "xmlns:dc=\"http://purl.org/dc/elements/1.1/\"");

        if (model.getRdfAboutTag() != null && model.getRdfAboutTag().getNamespaceURI() != null
                && !model.getRdfAboutTag().getNamespaceURI().equals("http://www.w3.org/1999/02/22-rdf-syntax-ns#"))

        {
            result.append(" xmlns:" + model.getRdfAboutTag().getPrefix() + "=\""
                    + model.getRdfAboutTag().getNamespaceURI() + "\"");
        }

        result.append(">\n");
        if (pairs != null) {

            for (Describable pair : pairs) {
                if (pair instanceof Pair) {
                    String key = ((Pair) pair).getKey();
                    try {
                        result.append("\t<rdf:Description rdf:about=\""
                                + PropertyReader.getProperty("escidoc.cone.service.url") + key.replace("\"", "\\\"")
                                + "\">\n");
                        if (((Pair) pair).getValue() instanceof LocalizedString) {
                            if (((LocalizedString) ((Pair) pair).getValue()).getLanguage() != null) {
                                result.append("\t\t<dc:title xml:lang=\""
                                        + ((LocalizedString) ((Pair) pair).getValue()).getLanguage() + "\">"
                                        + StringEscapeUtils.escapeXml10(
                                                ((LocalizedString) ((Pair) pair).getValue()).getValue())
                                        + "</dc:title>\n");
                            } else {
                                result.append("\t\t<dc:title>"
                                        + StringEscapeUtils.escapeXml10(
                                                ((LocalizedString) ((Pair) pair).getValue()).getValue())
                                        + "</dc:title>\n");
                            }
                        } else {
                            result.append("\t\t<dc:title>"
                                    + StringEscapeUtils.escapeXml10(((Pair) pair).getValue().toString())
                                    + "</dc:title>\n");
                        }
                        result.append("\t</rdf:Description>\n");
                    } catch (Exception exception) {
                        throw new RuntimeException(exception);
                    }
                } else if (pair instanceof TreeFragment) {
                    result.append(((TreeFragment) pair).toRdf(model));
                }
            }
        }

        result.append("</rdf:RDF>\n");

        return result.toString();
    }

    /*
    public static String xmlEscape(String value)
    {
    value = value.replace("&", "&amp;");
    value = value.replace("<", "&lt;");
    value = value.replace(">", "&gt;");
        
    return value;
    }
    */
    /**
     * Formats an a Map of triples into RDF.
     * 
     * @param id The cone-id of the object
     * @param triples A map of s-p-o triples
     * 
     * @return The RDF
     */
    public static String formatMap(String id, TreeFragment triples, Model model) {
        if (triples != null) {
            StringWriter result = new StringWriter();

            result.append("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n");
            result.append("<rdf:RDF xmlns:rdf=\"http://www.w3.org/1999/02/22-rdf-syntax-ns#\"");

            if (model.getRdfAboutTag() != null && model.getRdfAboutTag().getNamespaceURI() != null && !model
                    .getRdfAboutTag().getNamespaceURI().equals("http://www.w3.org/1999/02/22-rdf-syntax-ns#")) {
                result.append(" xmlns:" + model.getRdfAboutTag().getPrefix() + "=\""
                        + model.getRdfAboutTag().getNamespaceURI() + "\"");
            }

            result.append(">\n");

            result.append(triples.toRdf(model));

            result.append("</rdf:RDF>\n");

            return result.toString();
        } else {
            return "";
        }
    }
}