package org.apache.rya.api.resolver;

/*
 * 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.
 */


import org.apache.rya.api.domain.RyaStatement;
import org.apache.rya.api.domain.RyaType;
import org.apache.rya.api.domain.RyaURI;
import org.openrdf.model.Literal;
import org.openrdf.model.Statement;
import org.openrdf.model.URI;
import org.openrdf.model.Value;
import org.openrdf.model.impl.ContextStatementImpl;
import org.openrdf.model.impl.LiteralImpl;
import org.openrdf.model.impl.StatementImpl;
import org.openrdf.model.impl.URIImpl;
import org.openrdf.model.vocabulary.XMLSchema;

/**
 * Date: 7/17/12
 * Time: 8:34 AM
 */
public class RyaToRdfConversions {

    public static URI convertURI(RyaURI uri) {
        return new URIImpl(uri.getData());
    }

    public static Literal convertLiteral(RyaType literal) {
        if (XMLSchema.STRING.equals(literal.getDataType())) {
            return new LiteralImpl(literal.getData());
        } else {
            return new LiteralImpl(literal.getData(), literal.getDataType());
        }
        //TODO: No Language support yet
    }

    public static Value convertValue(RyaType value) {
        //assuming either uri or Literal here
        return (value instanceof RyaURI) ? convertURI((RyaURI) value) : convertLiteral(value);
    }

    public static Statement convertStatement(RyaStatement statement) {
        assert statement != null;
        if (statement.getContext() != null) {
            return new ContextStatementImpl(convertURI(statement.getSubject()),
                    convertURI(statement.getPredicate()),
                    convertValue(statement.getObject()),
                    convertURI(statement.getContext()));
        } else {
            return new StatementImpl(convertURI(statement.getSubject()),
                    convertURI(statement.getPredicate()),
                    convertValue(statement.getObject()));
        }
    }

}