/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* License: GNU Lesser General Public License (LGPL), version 2.1 or later.
* See the lgpl.txt file in the root directory or <http://www.gnu.org/licenses/lgpl-2.1.html>.
*/
package org.hibernate.query.criteria.internal.expression;
import java.io.Serializable;
import org.hibernate.query.criteria.internal.CriteriaBuilderImpl;
import org.hibernate.query.criteria.internal.ParameterRegistry;
import org.hibernate.query.criteria.internal.ValueHandlerFactory;
import org.hibernate.query.criteria.internal.compile.RenderingContext;
/**
* Represents a literal expression.
*
* @author Steve Ebersole
*/
public class LiteralExpression<T> extends ExpressionImpl<T> implements Serializable {
private Object literal;
@SuppressWarnings({ "unchecked" })
public LiteralExpression(CriteriaBuilderImpl criteriaBuilder, T literal) {
this( criteriaBuilder, (Class<T>) determineClass( literal ), literal );
}
private static Class determineClass(Object literal) {
return literal == null ? null : literal.getClass();
}
public LiteralExpression(CriteriaBuilderImpl criteriaBuilder, Class<T> type, T literal) {
super( criteriaBuilder, type );
this.literal = literal;
}
@SuppressWarnings({ "unchecked" })
public T getLiteral() {
return (T) literal;
}
public void registerParameters(ParameterRegistry registry) {
// nothing to do
}
@SuppressWarnings({ "unchecked" })
public String render(RenderingContext renderingContext) {
if ( ValueHandlerFactory.isNumeric( literal ) ) {
return ValueHandlerFactory.determineAppropriateHandler( (Class) literal.getClass() ).render( literal );
}
// else...
final String parameterName = renderingContext.registerLiteralParameterBinding( getLiteral(), getJavaType() );
return ':' + parameterName;
}
@SuppressWarnings({ "unchecked" })
public String renderProjection(RenderingContext renderingContext) {
// some drivers/servers do not like parameters in the select clause
final ValueHandlerFactory.ValueHandler handler =
ValueHandlerFactory.determineAppropriateHandler( literal.getClass() );
if ( ValueHandlerFactory.isCharacter( literal ) ) {
return '\'' + handler.render( literal ) + '\'';
}
else {
return handler.render( literal );
}
}
@Override
@SuppressWarnings({ "unchecked" })
protected void resetJavaType(Class targetType) {
super.resetJavaType( targetType );
ValueHandlerFactory.ValueHandler valueHandler = getValueHandler();
if ( valueHandler == null ) {
valueHandler = ValueHandlerFactory.determineAppropriateHandler( targetType );
forceConversion( valueHandler );
}
if ( valueHandler != null ) {
literal = valueHandler.convert( literal );
}
}
}