/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * 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 org.apache.oodt.profile;

import com.hp.hpl.jena.rdf.model.Model;
import com.hp.hpl.jena.rdf.model.Property;
import com.hp.hpl.jena.rdf.model.Resource;
import java.io.IOException;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
import org.apache.oodt.commons.Configuration;
import org.apache.oodt.xmlquery.Result;
import org.apache.oodt.commons.util.Documentable;
import org.apache.oodt.commons.util.XML;
import org.w3c.dom.DOMException;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;
import java.net.URI;

/**
 * Resource attribuets.
 *
 * Objects of this class are resource attributes of profiles.
 *
 * @author Kelly
 */
public class ResourceAttributes implements Serializable, Cloneable, Comparable, Documentable {
	/**
	 * Create blank profile attributes.
	 */
	public ResourceAttributes() {
		this(/*profile*/null);
	}

	/**
	 * Create blank profile attributes belonging to a certain profile.
	 *
	 * @param profile Owning profile.
	 */
	public ResourceAttributes(Profile profile) {
		this.profile = profile;
		identifier = "UNKNOWN";

		// Other attributes are optional according to prof.dtd.
		initializeLists();
	}

	/**
	 * Create resource attributes from an XML document.
	 *
	 * @param profile Owning profile.
	 * @param root The &lt;resAttributes&gt; element.
	 */
	public ResourceAttributes(Profile profile, Node root) {
		this.profile = profile;
		initializeLists();
		NodeList children = root.getChildNodes();
		for (int i = 0; i < children.getLength(); ++i) {
			Node node = children.item(i);
			if ("Identifier".equals(node.getNodeName()))
				identifier = XML.unwrappedText(node);
			else if ("Title".equals(node.getNodeName()))
				title = XML.unwrappedText(node);
			else if ("Format".equals(node.getNodeName()))
				formats.add(XML.unwrappedText(node));
			else if ("Description".equals(node.getNodeName()))
				description = XML.unwrappedText(node);
			else if ("Creator".equals(node.getNodeName()))
				creators.add(XML.unwrappedText(node));
			else if ("Subject".equals(node.getNodeName()))
				subjects.add(XML.unwrappedText(node));
			else if ("Publisher".equals(node.getNodeName()))
				publishers.add(XML.unwrappedText(node));
			else if ("Contributor".equals(node.getNodeName()))
				contributors.add(XML.unwrappedText(node));
			else if ("Date".equals(node.getNodeName()))
				dates.add(XML.unwrappedText(node));
			else if ("Type".equals(node.getNodeName()))
				types.add(XML.unwrappedText(node));
			else if ("Source".equals(node.getNodeName()))
				sources.add(XML.unwrappedText(node));
			else if ("Language".equals(node.getNodeName()))
				languages.add(XML.unwrappedText(node));
			else if ("Relation".equals(node.getNodeName()))
				relations.add(XML.unwrappedText(node));
			else if ("Coverage".equals(node.getNodeName()))
				coverages.add(XML.unwrappedText(node));
			else if ("Rights".equals(node.getNodeName()))
				rights.add(XML.unwrappedText(node));
			else if ("resContext".equals(node.getNodeName()))
				contexts.add(XML.unwrappedText(node));
			else if ("resAggregation".equals(node.getNodeName()))
				aggregation = XML.unwrappedText(node);
			else if ("resClass".equals(node.getNodeName()))
				clazz = XML.unwrappedText(node);
			else if ("resLocation".equals(node.getNodeName()))
				locations.add(XML.unwrappedText(node));
		}
	}

	/**
	 * Create resource attributes from constituent attributes.
	 *
	 * According to the Dublin Core, these attributes may be multivalued, but we force
	 * the identifier, title, and description to be singly values in the DTD, so it is
	 * here, too.  Unless otherwise specified, these are all collections of {@link
	 * String}.
	 *
	 * @param profile Owning profile.
	 * @param identifier The unique identifier.
	 * @param title Title of the resource.
	 * @param formats Format of the resource.
	 * @param description Description of the resource.
	 * @param creators Who/what created the resource.
	 * @param subjects Subject matter covered by the resource.
	 * @param publishers Who/what published the resrouce.
	 * @param contributors Who/what contributed to the resource.
	 * @param dates When the resource was created (collection of {@link java.util.Date}.
	 * @param types Type of the resource.
	 * @param sources Source of the resource.
	 * @param languages Language in which the resource is written.
	 * @param relations Relationships to the resource.
	 * @param coverages Coverage of the resource.
	 * @param rights Rights of the resource.
	 * @param contexts Context of the resource.
	 * @param aggregation Aggregation of the resource.
	 * @param clazz Class of the resource.
	 * @param locations Location of the resource.
	 */
	public ResourceAttributes(Profile profile, String identifier, String title, List formats, String description,
		List creators, List subjects, List publishers, List contributors, List dates, List types, List sources,
		List languages, List relations, List coverages, List rights, List contexts, String aggregation, String clazz,
		List locations) {
		this.profile = profile;
		this.identifier = identifier;
		this.title = title;
		this.formats = formats;
		this.description = description;
		this.creators = creators;
		this.subjects = subjects;
		this.publishers = publishers;
		this.contributors = contributors;
		this.dates = dates;
		this.types = types;
		this.sources = sources;
		this.languages = languages;
		this.relations = relations;
		this.coverages = coverages;
		this.rights = rights;
		this.contexts = contexts;
		this.aggregation = aggregation;
		this.clazz = clazz;
		this.locations = locations;
	}

	public int hashCode() {
		return identifier.hashCode();
	}

	public boolean equals(Object rhs) {
		if (rhs == this) return true;
		if (rhs == null || !(rhs instanceof ResourceAttributes)) return false;
		return ((ResourceAttributes) rhs).identifier.equals(identifier);
	}

	public int compareTo(Object rhs) {
		ResourceAttributes obj = (ResourceAttributes) rhs;
		return identifier.compareTo(obj.identifier);
	}

	public String toString() {
		return getClass().getName() + "[identifer=" + identifier + "]";
	}

	public Object clone() {
		Object clone = null;
		try {
			clone = super.clone();
		} catch (CloneNotSupportedException cantHappen) {}
		return clone;
	}

	/**
	 * Add resource attribute statements to the profile description in an RDF model.
	 *
	 * @param model Model to which the profile belongs.
	 * @param resource Resource description of the profile.
	 * @param profAttr Profile's attributes.
	 */
	void addToModel(Model model, Resource resource, ProfileAttributes profAttr) {
		URI myURI = getURI();

		Utility.addProperty(model, resource, Utility.dcTitle,        title,        profAttr, myURI);
		Utility.addProperty(model, resource, Utility.dcFormat,       formats,      profAttr, myURI);
		Utility.addProperty(model, resource, Utility.dcDescription,  description,  profAttr, myURI);
		Utility.addProperty(model, resource, Utility.dcCreator,      creators,     profAttr, myURI);
		Utility.addProperty(model, resource, Utility.dcSubject,      subjects,     profAttr, myURI);
		Utility.addProperty(model, resource, Utility.dcPublisher,    publishers,   profAttr, myURI);
		Utility.addProperty(model, resource, Utility.dcContributor,  contributors, profAttr, myURI);
		Utility.addProperty(model, resource, Utility.dcDate,         dates,        profAttr, myURI);
		Utility.addProperty(model, resource, Utility.dcType,         types,        profAttr, myURI);
		Utility.addProperty(model, resource, Utility.dcSource,       sources,      profAttr, myURI);
		Utility.addProperty(model, resource, Utility.dcLanguage,     languages,    profAttr, myURI);
		Utility.addProperty(model, resource, Utility.dcRelation,     relations,    profAttr, myURI);
		Utility.addProperty(model, resource, Utility.dcRights,       rights,       profAttr, myURI);
		Utility.addProperty(model, resource, Utility.edmContext,     contexts,     profAttr, myURI);
		Utility.addProperty(model, resource, Utility.edmAggregation, aggregation,  profAttr, myURI);
		Utility.addProperty(model, resource, Utility.edmClass,       clazz,        profAttr, myURI);
		Utility.addProperty(model, resource, Utility.edmLocation,    locations,    profAttr, myURI);
	}

	public URI getURI() {
		String identification;
		if (identifier == null || identifier.length() == 0) {
			if (locations.isEmpty())
				identification = null;
			else
				identification = (String) locations.get(0);
		} else
			identification = identifier;

		return identification == null? UNKNOWN_URI : URI.create(identification);
	}

	/**
	 * Get the identifier.
	 *
	 * @return The identifier.
	 */
	public String getIdentifier() {
		return identifier;
	}

	/**
	 * Set the identifier.
	 *
	 * @param identifier The identifier.
	 */
	public void setIdentifier(String identifier) {
		this.identifier = identifier;
	}

	/**
	 * Get the title.
	 *
	 * @return The title.
	 */
	public String getTitle() {
		return title;
	}

	/**
	 * Set the title.
         *
         * @param title The title.
         */
        public void setTitle(String title) {
                this.title = title;
        }


	/**
	 * Get the formats.
	 *
	 * @return The formats.
	 */
	public List getFormats() {
		return formats;
	}

	/**
	 * Set the description.
	 *
	 * @param description The new description.
	 */
	public void setDescription(String description) {
		this.description = description;
	}

	/**
	 * Get the description.
	 *
	 * @return The description.
	 */
	public String getDescription() {
		return description;
	}

	/**
	 * Get the creators.
	 *
	 * @return The creators.
	 */
	public List getCreators() {
		return creators;
	}

	/**
	 * Get the subjects.
	 *
	 * @return The subjects.
	 */
	public List getSubjects() {
		return subjects;
	}

	/**
	 * Get the publishers.
	 *
	 * @return The publishers.
	 */
	public List getPublishers() {
		return publishers;
	}

	/**
	 * Get the contributors.
	 *
	 * @return The contributors.
	 */
	public List getContributors() {
		return contributors;
	}

	/**
	 * Get the dates.
	 *
	 * @return The dates.
	 */
	public List getDates() {
		return dates;
	}

	/**
	 * Get the types.
	 *
	 * @return The types.
	 */
	public List getTypes() {
		return types;
	}

	/**
	 * Get the sources.
	 *
	 * @return The sources.
	 */
	public List getSources() {
		return sources;
	}

	/**
	 * Get the languages.
	 *
	 * @return The languages.
	 */
	public List getLanguages() {
		return languages;
	}

	/**
	 * Get the relations.
	 *
	 * @return The relations.
	 */
	public List getRelations() {
		return relations;
	}

	/**
	 * Get the coverages.
	 *
	 * @return The coverages.
	 */
	public List getCoverages() {
		return coverages;
	}

	/**
	 * Get the rights.
	 *
	 * @return The rights.
	 */
	public List getRights() {
		return rights;
	}

	/**
	 * Get the contexts.
	 *
	 * @return The contexts, a list of {@link String}s.
	 */
	public List getResContexts() {
		return contexts;
	}


	/**
	 * Get the aggregation.
	 *
	 * @return The aggregation.
	 */
	public String getResAggregation() {
		return aggregation;
	}

	/**
	 * Set the aggregation.
	 *
	 * @param aggregation The aggregation.
	 */
	public void setResAggregation(String aggregation) {
		this.aggregation = aggregation;
	}

	/**
	 * Get the class.
	 *
	 * @return The class.
	 */
	public String getResClass() {
		return clazz;
	}

	/**
	 * Set the class.
	 *
	 * @param clazz The class.
	 */
	public void setResClass(String clazz) {
		this.clazz = clazz;
	}

	/**
	 * Get the locations.
	 *
	 * @return Locations, a list of {@link String}s.
	 */
	public List getResLocations() {
		return locations;
	}


	/**
	 * Initialize all the various {@link java.util.List} fields.
	 */
	protected void initializeLists() {
		formats = new ArrayList();
		creators = new ArrayList();
		subjects = new ArrayList();
		publishers = new ArrayList();
		contributors = new ArrayList();
		dates = new ArrayList();
		types = new ArrayList();
		sources = new ArrayList();
		languages = new ArrayList();
		relations = new ArrayList();
		coverages = new ArrayList();
		rights = new ArrayList();
		contexts = new ArrayList();
		locations = new ArrayList();
	}

	/** Profile I describe. */
	protected Profile profile;

	/** Identifer. */
	protected String identifier;

	/** Titles. */
	protected String title;

	/** Formats. */
	protected List formats;

	/** Descriptions. */
	protected String description;

	/** Creators. */
	protected List creators;

	/** Subjects. */
	protected List subjects;

	/** Publishers. */
	protected List publishers;

	/** Contributors. */
	protected List contributors;

	/** Dates. */
	protected List dates;

	/** Types. */
	protected List types;

	/** Sources. */
	protected List sources;

	/** Languages. */
	protected List languages;

	/** Relations. */
	protected List relations;

	/** Coverages. */
	protected List coverages;

	/** Rights. */
	protected List rights;

	/** Contexts, one or more list of {@link String}s. */
	protected List contexts;

	/** Aggregation. */
	protected String aggregation;

	/** Clazz. */
	protected String clazz;

	/** Locations, zero or more {@link String}s. */
	protected List locations;

	/**
	 * Serialize this attributes as an XML node.
	 *
	 * @param doc The document that will own this node.
	 * @return The XML element &lt;resAttributes&gt; representing these attributes.
	 * @throws DOMException If an error occurs creating the XML nodes.
	 */
	public Node toXML(Document doc) throws DOMException {
		Element root = doc.createElement("resAttributes");
		XML.add(root, "Identifier", identifier);
		XML.addNonNull(root, "Title", title);
		XML.add(root, "Format", formats);
		XML.addNonNull(root, "Description", description);
		XML.add(root, "Creator", creators);
		XML.add(root, "Subject", subjects);
		XML.add(root, "Publisher", publishers);
		XML.add(root, "Contributor", contributors);
		XML.add(root, "Date", dates);
		XML.add(root, "Type", types);
		XML.add(root, "Source", sources);
		XML.add(root, "Language", languages);
		XML.add(root, "Relation", relations);
		XML.add(root, "Coverage", coverages);
		XML.add(root, "Rights", rights);
		List contexts = new ArrayList(this.contexts);
		if (contexts.isEmpty()) contexts.add("UNKNOWN");
		XML.add(root, "resContext", contexts);
		XML.addNonNull(root, "resAggregation", aggregation);
		if(clazz==null) clazz="UNKNOWN";
		XML.addNonNull(root, "resClass", clazz);
		XML.add(root, "resLocation", locations);

		return root;
	}

	/**
	 * Create a &lt;resAttributes&gt; document using the profiles DTD.
	 *
	 * @return A &lt;resAttributs&gt; document with the profiles DTD.
	 */
	public static Document createResAttributesDocument() {
		return Profile.createDocument("resAttributes");
	}

	/** URI of a profile whose URI is unknown. */
	private static final URI UNKNOWN_URI = URI.create("urn:eda:profile:UNKNOWN");

        /** Serial version unique ID. */
        static final long serialVersionUID = -4251763559607642607L;
}