rdfexplorerutil.java

这是外国一个开源推理机

/*  Sesame - Storage and Querying architecture for RDF and RDF Schema
 *  Copyright (C) 2001-2005 Aduna
 *
 *  Contact:
 *  	Aduna
 *  	Prinses Julianaplein 14 b
 *  	3817 CS Amersfoort
 *  	The Netherlands
 *  	tel. [phone]
 *  	fax. [phone]
 *
 *  	http://aduna.biz/
 *  	http://www.openrdf.org/
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2.1 of the License, or (at your option) any later version.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package org.openrdf.sesame.server.http;

import java.util.HashMap;
import java.util.Map;

import org.openrdf.util.StringUtil;
import org.openrdf.util.http.HttpClientUtil;

import org.openrdf.model.BNode;
import org.openrdf.model.Literal;
import org.openrdf.model.Resource;
import org.openrdf.model.URI;
import org.openrdf.model.Value;
import org.openrdf.model.impl.URIImpl;

import org.openrdf.rio.ntriples.NTriplesUtil;

import org.openrdf.sesame.sail.RdfSource;
import org.openrdf.sesame.sail.StatementIterator;

public class RdfExplorerUtil {

	private static Map _rdfLabelMap;

	static {
		_rdfLabelMap = new HashMap(64);
		_rdfLabelMap.put(URIImpl.RDF_TYPE, "type");
		_rdfLabelMap.put(URIImpl.RDF_PROPERTY, "Property");
		_rdfLabelMap.put(URIImpl.RDF_STATEMENT, "Statement");
		_rdfLabelMap.put(URIImpl.RDF_XMLLITERAL, "XMLLiteral");
		_rdfLabelMap.put(URIImpl.RDF_SUBJECT, "subject");
		_rdfLabelMap.put(URIImpl.RDF_PREDICATE, "predicate");
		_rdfLabelMap.put(URIImpl.RDF_SUBJECT, "object");
		_rdfLabelMap.put(URIImpl.RDF_FIRST, "first");
		_rdfLabelMap.put(URIImpl.RDF_REST, "rest");
		_rdfLabelMap.put(URIImpl.RDF_ALT, "Alt");
		_rdfLabelMap.put(URIImpl.RDF_BAG, "Bag");
		_rdfLabelMap.put(URIImpl.RDF_SEQ, "Seq");
		_rdfLabelMap.put(URIImpl.RDF_LIST, "List");
		_rdfLabelMap.put(URIImpl.RDF_NIL, "nil");

		_rdfLabelMap.put(URIImpl.RDFS_CLASS, "Class");
		_rdfLabelMap.put(URIImpl.RDFS_RESOURCE, "Resource");
		_rdfLabelMap.put(URIImpl.RDFS_LITERAL, "Literal");
		_rdfLabelMap.put(URIImpl.RDFS_SUBCLASSOF, "subClassOf");
		_rdfLabelMap.put(URIImpl.RDFS_SUBPROPERTYOF, "subPropertyOf");
		_rdfLabelMap.put(URIImpl.RDFS_DOMAIN, "domain");
		_rdfLabelMap.put(URIImpl.RDFS_RANGE, "range");
		_rdfLabelMap.put(URIImpl.RDFS_COMMENT, "comment");
		_rdfLabelMap.put(URIImpl.RDFS_LABEL, "label");
		_rdfLabelMap.put(URIImpl.RDFS_ISDEFINEDBY, "isDefinedBy");
		_rdfLabelMap.put(URIImpl.RDFS_SEEALSO, "seeAlso");
		_rdfLabelMap.put(URIImpl.RDFS_MEMBER, "member");
		_rdfLabelMap.put(URIImpl.RDFS_DATATYPE, "Datatype");
		_rdfLabelMap.put(URIImpl.RDFS_CONTAINER, "Container");
		_rdfLabelMap.put(URIImpl.RDFS_CONTAINERMEMBERSHIPPROPERTY, "ContainerMemberShipProperty");
	}

	public static String getDisplayString(Value value) {
		if (value instanceof URI) {
			return ((URI)value).getURI();
		}
		else if (value instanceof BNode) {
			return "_:" + ((BNode)value).getID();
		}
		else if (value instanceof Literal) {
			Literal lit = (Literal)value;

			StringBuffer buf = new StringBuffer(32);
			buf.append("\"");
			buf.append(lit.getLabel());
			buf.append("\"");

			if (lit.getLanguage() != null) {
				buf.append("@").append(lit.getLanguage());
			}
			else if (lit.getDatatype() != null) {
				buf.append("^^").append(lit.getDatatype().getURI());
			}

			return buf.toString();
		}

		return "";
	}

	public static String getLabelForResource(Resource resource, RdfSource rdfSource) {
		// Check RDF/RDFS standard labels
		String label = (String)_rdfLabelMap.get(resource);

		if (label == null) {
			// Get label from repository
			StatementIterator labelIter = rdfSource.getStatements(resource, URIImpl.RDFS_LABEL, null);

			while (labelIter.hasNext()) {
				Value labelObj = labelIter.next().getObject();
				if (labelObj instanceof Literal) {
					label = ((Literal)labelObj).getLabel();
					break;
				}
			}

			labelIter.close();
		}

		return label;
	}

	public static String getQueryString(String repository, Value value, boolean useLabels) {
		Map params = new HashMap(4);

		params.put("repository", repository);
		params.put("value", NTriplesUtil.toNTriplesString(value));
		if (useLabels) {
			params.put("useLabels", "yes");
		}

		return HttpClientUtil.buildQueryString(params);
	}

	public static String javaScriptEscape(String text) {
		String result = StringUtil.gsub("\\", "\\\\", text);
		result = StringUtil.gsub("\"", "\\\"", result);
		result = StringUtil.gsub("'", "\\'", result);
		return result;
	}
}