/**
* Copyright 2005-2014 Restlet
*
* The contents of this file are subject to the terms of one of the following
* open source licenses: Apache 2.0 or or EPL 1.0 (the "Licenses"). You can
* select the license that you prefer but you may not use this file except in
* compliance with one of these Licenses.
*
* You can obtain a copy of the Apache 2.0 license at
* http://www.opensource.org/licenses/apache-2.0
*
* You can obtain a copy of the EPL 1.0 license at
* http://www.opensource.org/licenses/eclipse-1.0
*
* See the Licenses for the specific language governing permissions and
* limitations under the Licenses.
*
* Alternatively, you can obtain a royalty free commercial license with less
* limitations, transferable or non-transferable, directly at
* http://restlet.com/products/restlet-framework
*
* Restlet is a registered trademark of Restlet S.A.S.
*/
package org.restlet.ext.rdf;
import org.restlet.data.Language;
import org.restlet.data.Reference;
/**
* Literal as defined by RDF. Composed of the literal value, optional datatype
* reference and language properties.
*
* @author Jerome Louvel
* @see <a href="http://www.w3.org/TR/rdf-concepts/#section-Graph-Literal">RDF
* literals</a>
*/
public class Literal {
/** The optional datatype reference. */
private Reference datatypeRef;
/** The optional language. */
private Language language;
/** The value. */
private String value;
/**
* Constructor.
*
* @param value
* The value.
*/
public Literal(String value) {
this(value, null, null);
}
/**
* Constructor.
*
* @param value
* The value.
* @param datatypeRef
* The optional datatype reference.
*/
public Literal(String value, Reference datatypeRef) {
this(value, datatypeRef, null);
}
/**
* Constructor.
*
* @param value
* The value.
* @param datatypeRef
* The optional datatype reference.
* @param language
* The optional language.
*/
public Literal(String value, Reference datatypeRef, Language language) {
this.value = value;
this.datatypeRef = datatypeRef;
this.language = language;
}
/**
* Returns the optional datatype reference.
*
* @return The datatype reference or null.
*/
public Reference getDatatypeRef() {
return datatypeRef;
}
/**
* Returns the optional language.
*
* @return The language or null.
*/
public Language getLanguage() {
return language;
}
/**
* Returns the value.
*
* @return The value.
*/
public String getValue() {
return value;
}
/**
* Indicates if the literal is plain. Plain literals have a value and an
* optional language tag.
*
* @return True if the literal is plain.
*/
public boolean isPlain() {
return (getValue() != null) && (getDatatypeRef() == null);
}
/**
* Indicates if the literal is types. Typed literals have a value and a
* datatype reference.
*
* @return True if the literal is typed.
*/
public boolean isTyped() {
return (getValue() != null) && (getDatatypeRef() != null);
}
/**
* Sets the datatype reference.
*
* @param datatypeRef
* The datatype reference.
*/
public void setDatatypeRef(Reference datatypeRef) {
this.datatypeRef = datatypeRef;
}
/**
* Sets the language.
*
* @param language
* The language.
*/
public void setLanguage(Language language) {
this.language = language;
}
/**
* Sets the value.
*
* @param value
* The value.
*/
public void setValue(String value) {
this.value = value;
}
@Override
public String toString() {
return getValue();
}
}