it.tidalwave.metadata.persistence.spi.IntrospectionBeanAccessor Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of it-tidalwave-metadata-persistence Show documentation
The newest version!
/***********************************************************************************************************************
 *
 * blueMarine Metadata - open source media workflow
 * Copyright (C) 2007-2011 by Tidalwave s.a.s. (http://www.tidalwave.it)
 *
 ***********************************************************************************************************************
 *
 * Licensed 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.
 *
 ***********************************************************************************************************************
 *
 * WWW: http://bluemarine.tidalwave.it
 * SCM: https://kenai.com/hg/bluemarine~metadata-src
 *
 **********************************************************************************************************************/
package it.tidalwave.metadata.persistence.spi;

import javax.annotation.CheckForNull;
import javax.annotation.Nonnull;
import java.beans.IntrospectionException;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.util.Locale;
import org.jdesktop.beansbinding.Property;
import it.tidalwave.beans.FastBeanProperty;

/*******************************************************************************
 *
 * This class provides support for a {@link BeanAccessor} based on JavaBean 
 * introspection.
 * 
 * @author  Fabrizio Giudici
 * @version $Id$
 *
 ******************************************************************************/
public abstract class IntrospectionBeanAccessor extends BeanAccessorSupport
  {
    /***************************************************************************
     *
     * Creates this object passing the class of the represented item and the name
     * of the property set.
     * 
     * @param  itemClass        the class of the represented item
     * @param  propertySetName  the name of the property set
     * 
     **************************************************************************/
    public IntrospectionBeanAccessor (@Nonnull final Class itemClass,
                                      @Nonnull final String propertySetName) 
      {
        super(itemClass, propertySetName);
      }

    /***************************************************************************
     *
     * {@inheritDoc}.
     * 
     **************************************************************************/
    @Nonnull
    public Class getDefaultPropertyType (@Nonnull final String propertyName) 
      throws UnknownPropertyException
      {
        final String xxx = propertyName.substring(0, 1).toUpperCase(Locale.getDefault()) + propertyName.substring(1);

        try 
          {
            final String getterName = "get" + xxx;
            return getItemClass().getMethod(getterName).getReturnType();
          }
        catch (NoSuchMethodException e)
          {
            try 
              {
                final String getterName = "is" + xxx;
                return getItemClass().getMethod(getterName).getReturnType();
              }
            catch (NoSuchMethodException e2) 
              {
                throw new UnknownPropertyException(getItemClass(), propertyName);
              }
          }
      }

    /***************************************************************************
     *
     * {@inheritDoc}.
     * 
     **************************************************************************/
    @CheckForNull
    public Object getProperty (@Nonnull final String propertyName, @Nonnull final Item bean) 
      throws UnknownPropertyException
      {
        final Property property = FastBeanProperty.create(propertyName);
        return convertValueToPersistence(propertyName, property.getValue(bean));
      }

    /***************************************************************************
     *
     * {@inheritDoc}.
     * 
     **************************************************************************/
    public void setProperty (@Nonnull final Item bean, 
                             @Nonnull final String propertyName, 
                             @CheckForNull final Object value) 
      throws UnknownPropertyException
      {
        final Property property = FastBeanProperty.create(propertyName);
        property.setValue(bean, convertValueFromPersistence(propertyName, value));
      }

    /***************************************************************************
     *
     * {@inheritDoc}.
     * 
     **************************************************************************/
    @Override
    @Nonnull
    public String toString()
      {
        return String.format("IntrospectionBeanAccessor[%s]", getPropertySetName());
      }
    
    /***************************************************************************
     *
     **************************************************************************/
    @Nonnull
    // FIXME the parameter is unneeded, use itemClass
    // FIXME compute the thing only the first time is called, then cache it
    protected PropertyDescriptor[] findPropertyDescriptors (@Nonnull final Object item) 
      throws IntrospectionException 
      {
        return Introspector.getBeanInfo(item.getClass()).getPropertyDescriptors();
      }
  }