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From rdon...@apache.org
Subject cvs commit: jakarta-commons/betwixt/src/java/org/apache/commons/betwixt BeanProperty.java
Date Sun, 27 Jul 2003 17:51:46 GMT
rdonkin     2003/07/27 10:51:46

  Added:       betwixt/src/java/org/apache/commons/betwixt
                        BeanProperty.java
  Log:
  Added support for reading dynabeans
  
  Revision  Changes    Path
  1.1                  jakarta-commons/betwixt/src/java/org/apache/commons/betwixt/BeanProperty.java
  
  Index: BeanProperty.java
  ===================================================================
  package org.apache.commons.betwixt;
  
  /*
   * ====================================================================
   *
   * The Apache Software License, Version 1.1
   *
   * Copyright (c) 1999-2002 The Apache Software Foundation.  All rights
   * reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   *
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in
   *    the documentation and/or other materials provided with the
   *    distribution.
   *
   * 3. The end-user documentation included with the redistribution, if
   *    any, must include the following acknowlegement:
   *       "This product includes software developed by the
   *        Apache Software Foundation (http://www.apache.org/)."
   *    Alternately, this acknowlegement may appear in the software itself,
   *    if and wherever such third-party acknowlegements normally appear.
   *
   * 4. The names "The Jakarta Project", "Commons", and "Apache Software
   *    Foundation" must not be used to endorse or promote products derived
   *    from this software without prior written permission. For written
   *    permission, please contact apache@apache.org.
   *
   * 5. Products derived from this software may not be called "Apache"
   *    nor may "Apache" appear in their names without prior written
   *    permission of the Apache Group.
   *
   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
   * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
   * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
   * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   * ====================================================================
   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
   */
  
  import java.beans.PropertyDescriptor;
  
  import java.lang.reflect.Method;
  
  import org.apache.commons.betwixt.expression.Expression;
  import org.apache.commons.betwixt.expression.MethodExpression;
  import org.apache.commons.betwixt.expression.Updater;
  import org.apache.commons.betwixt.expression.MethodUpdater;
  import org.apache.commons.betwixt.expression.DynaBeanExpression;
  import org.apache.commons.beanutils.DynaProperty;
  
  /** 
    * Betwixt-centric view of a bean (or pseudo-bean) property.
    * This object decouples the way that the (possibly pseudo) property introspection
    * is performed from the results of that introspection.
    *
    * @author Robert Burrell Donkin
    * @version $Id: BeanProperty.java,v 1.1 2003/07/27 17:51:46 rdonkin Exp $
    */
  public class BeanProperty {
  
      /** The bean name for the property (not null) */
      private String propertyName;
      /** The type of this property (not null) */
      private Class propertyType;
      /** The Expression used to read values of this property (possibly null) */
      private Expression propertyExpression;
      /** The Updater used to write values of this property (possibly null) */
      private Updater propertyUpdater;
  
      /**
       * Construct a BeanProperty.
       * @param propertyName not null
       * @param propertyType not null
       * @param propertyExpression the Expression used to read the property, 
       * null if the property is not readable
       * @param propertyUpdater the Updater used to write the property, 
       * null if the property is not writable
       */
      public BeanProperty (
                          String propertyName, 
                          Class propertyType, 
                          Expression propertyExpression, 
                          Updater propertyUpdater) {
          this.propertyName = propertyName;
          this.propertyType = propertyType;
          this.propertyExpression = propertyExpression;
          this.propertyUpdater = propertyUpdater;        
      }
      
      /**
       * Constructs a BeanProperty from a <code>PropertyDescriptor</code>.
       * @param descriptor not null
       */
      public BeanProperty(PropertyDescriptor descriptor) {
          this.propertyName = descriptor.getName();
          this.propertyType = descriptor.getPropertyType();
          
          Method readMethod = descriptor.getReadMethod();
          if ( readMethod != null ) {
              this.propertyExpression = new MethodExpression( readMethod );
          }
          
          Method writeMethod = descriptor.getWriteMethod();
          if ( writeMethod != null ) {
              this.propertyUpdater = new MethodUpdater( writeMethod ); 
          }
      }
      
      /**
       * Constructs a BeanProperty from a <code>DynaProperty</code>
       * @param dynaProperty not null
       */
      public BeanProperty(DynaProperty dynaProperty) {
          this.propertyName = dynaProperty.getName();
          this.propertyType = dynaProperty.getType();
          this.propertyExpression = new DynaBeanExpression( propertyName );
          // todo: add updater
      }
  
      /**
        * Gets the bean name for this property.
        * Betwixt will map this to an xml name.
        * @return the bean name for this property, not null
        */
      public String getPropertyName() {
          return propertyName;
      }
  
      /** 
        * Gets the type of this property.
        * @return the property type, not null
        */
      public Class getPropertyType() {
          return propertyType;
      }
      
      /**
        * Gets the expression used to read this property.
        * @return the expression to be used to read this property 
        * or null if this property is not readable.
        */
      public Expression getPropertyExpression() {
          return propertyExpression;
      }
      
      /**
        * Gets the updater used to write to this properyty.
        * @return the Updater to the used to write to this property
        * or null if this property is not writable.
        */ 
      public Updater getPropertyUpdater() {
          return propertyUpdater;
      }
  }
  
  
  

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