Package org.hibernate.hql.ast.tree

Source Code of org.hibernate.hql.ast.tree.JavaConstantNode

/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2008, Red Hat Middleware LLC or third-party contributors as
* indicated by the @author tags or express copyright attribution
* statements applied by the authors.  All third-party contributions are
* distributed under license by Red Hat Middleware LLC.
*
* This copyrighted material is made available to anyone wishing to use, modify,
* copy, or redistribute it subject to the terms and conditions of the GNU
* Lesser General Public License, as published by the Free Software Foundation.
*
* This program 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 distribution; if not, write to:
* Free Software Foundation, Inc.
* 51 Franklin Street, Fifth Floor
* Boston, MA  02110-1301  USA
*
*/
package org.hibernate.hql.ast.tree;

import org.hibernate.type.Type;
import org.hibernate.type.TypeFactory;
import org.hibernate.type.LiteralType;
import org.hibernate.util.ReflectHelper;
import org.hibernate.util.StringHelper;
import org.hibernate.engine.SessionFactoryImplementor;
import org.hibernate.dialect.Dialect;
import org.hibernate.QueryException;
import org.hibernate.hql.QueryTranslator;

/**
* A node representing a static Java constant.
*
* @author Steve Ebersole
*/
public class JavaConstantNode extends Node implements ExpectedTypeAwareNode, SessionFactoryAwareNode {

  private SessionFactoryImplementor factory;

  private String constantExpression;
  private Object constantValue;
  private Type heuristicType;

  private Type expectedType;

  public void setText(String s) {
    // for some reason the antlr.CommonAST initialization routines force
    // this method to get called twice.  The first time with an empty string
    if ( StringHelper.isNotEmpty( s ) ) {
      constantExpression = s;
      constantValue = ReflectHelper.getConstantValue( s );
      heuristicType = TypeFactory.heuristicType( constantValue.getClass().getName() );
      super.setText( s );
    }
  }

  public void setExpectedType(Type expectedType) {
    this.expectedType = expectedType;
  }

  public Type getExpectedType() {
    return expectedType;
  }

  public void setSessionFactory(SessionFactoryImplementor factory) {
    this.factory = factory;
  }

  private String resolveToLiteralString(Type type) {
    try {
      LiteralType literalType = ( LiteralType ) type;
      Dialect dialect = factory.getDialect();
      return literalType.objectToSQLString( constantValue, dialect );
    }
    catch ( Throwable t ) {
      throw new QueryException( QueryTranslator.ERROR_CANNOT_FORMAT_LITERAL + constantExpression, t );
    }
  }

  public String getRenderText(SessionFactoryImplementor sessionFactory) {
    Type type = expectedType == null ? heuristicType : expectedType;
    return resolveToLiteralString( type );
  }
}
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