AbstractTupleElement.java :  » Database-ORM » hibernate » org » hibernate » ejb » criteria » expression » Java Open Source

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hibernate » org » hibernate » ejb » criteria » expression » AbstractTupleElement.java
/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * Copyright (c) 2009 by Red Hat Inc and/or its affiliates or by
 * third-party contributors as indicated by either @author tags or express
 * copyright attribution statements applied by the authors.  All
 * third-party contributions are distributed under license by Red Hat Inc.
 *
 * 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.ejb.criteria.expression;

import java.io.Serializable;

import org.hibernate.ejb.criteria.AbstractNode;
import org.hibernate.ejb.criteria.CriteriaBuilderImpl;
import org.hibernate.ejb.criteria.TupleElementImplementor;
import org.hibernate.ejb.criteria.ValueHandlerFactory;

/**
 * TODO : javadoc
 *
 * @author Steve Ebersole
 */
public abstract class AbstractTupleElement<X>
    extends AbstractNode
    implements TupleElementImplementor<X>, Serializable {
  private final Class originalJavaType;
  private Class<X> javaType;
  private String alias;
  private ValueHandlerFactory.ValueHandler<X> valueHandler;

  protected AbstractTupleElement(CriteriaBuilderImpl criteriaBuilder, Class<X> javaType) {
    super( criteriaBuilder );
    this.originalJavaType = javaType;
    this.javaType = javaType;
  }

  /**
   * {@inheritDoc}
   */
  public Class<X> getJavaType() {
    return javaType;
  }

  @SuppressWarnings({ "unchecked" })
  protected void resetJavaType(Class targetType) {
    this.javaType = targetType;
//    this.valueHandler = javaType.equals( originalJavaType )
//        ? null
//        : ValueHandlerFactory.determineAppropriateHandler( javaType );
    this.valueHandler = ValueHandlerFactory.determineAppropriateHandler( javaType );
  }

  protected void forceConversion(ValueHandlerFactory.ValueHandler<X> valueHandler) {
    this.valueHandler = valueHandler;
  }

  /**
   * {@inheritDoc}
   */
  public ValueHandlerFactory.ValueHandler<X> getValueHandler() {
    return valueHandler;
  }

  /**
   * {@inheritDoc}
   */
  public String getAlias() {
    return alias;
  }

  /**
   * Protected access to define the alias.
   *
   * @param alias The alias to use.
   */
  protected void setAlias(String alias) {
    this.alias = alias;
  }
}
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