cvs commit: jakarta-commons/betwixt/src/java/org/apache/commons/betwixt/expression DynaBeanExpression.java

[rd...@apache.org]

rdonkin     2003/07/27 10:53:11

  Added:       betwixt/src/java/org/apache/commons/betwixt/expression
                        DynaBeanExpression.java
  Log:
  Added support for reading dynabeans. Patch submitted by Michael Becke
  
  Revision  Changes    Path
  1.1                  jakarta-commons/betwixt/src/java/org/apache/commons/betwixt/expression/DynaBeanExpression.java
  
  Index: DynaBeanExpression.java
  ===================================================================
  /*
   * $Header: /home/cvs/jakarta-commons/betwixt/src/java/org/apache/commons/betwixt/expression/DynaBeanExpression.java,v 1.1 2003/07/27 17:53:11 rdonkin Exp $
   * $Revision: 1.1 $
   * $Date: 2003/07/27 17:53:11 $
   *
   * ====================================================================
   *
   * The Apache Software License, Version 1.1
   *
   * Copyright (c) 1999-2003 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/>.
   *
   * $Id: DynaBeanExpression.java,v 1.1 2003/07/27 17:53:11 rdonkin Exp $
   *
   */
  
  package org.apache.commons.betwixt.expression;
  
  import org.apache.commons.beanutils.DynaBean;
  
  /**
   * An Expression that gets a property value from a DynaBean.
   * 
   * @see org.apache.commons.beanutils.DynaBean
   * 
   * @author Michael Becke
   */
  public class DynaBeanExpression implements Expression {
  
      /** The name of the DynaBean property to get */
      private String propertyName;
  
      /**
       * Crates a new DynaBeanExpression.
       */
      public DynaBeanExpression() {
          super();
      }
  
      /**
       * Crates a new DynaBeanExpression.
       * 
       * @param propertyName the name of the DynaBean property to use
       */
      public DynaBeanExpression(String propertyName) {
          super();
          setPropertyName(propertyName);
      }
  
      /**
       * Returns the value of a DynaBean property from the bean stored in 
       * the Context.  Returns <code>null</code> if no DynaBean is stored 
       * in the Context or if the propertyName has not been set.
       * 
       * @param context the content containing the DynaBean
       * 
       * @return the DynaBean property value or <code>null</code>
       */
      public Object evaluate(Context context) {
          
          if (context.getBean() instanceof DynaBean && propertyName != null) {
              return ((DynaBean)context.getBean()).get(propertyName);
          } else {
              return null;
          }
      }
  
      /**
       * Do nothing.
       * @see {@link Expression#update}
       */
      public void update(Context context, String newValue) {
          // do nothing
      }
  
      /**
       * Gets the name of the property to get from the DynaBean.
       * @return the name of the property that this expression reads
       */
      public String getPropertyName() {
          return propertyName;
      }
  
      /**
       * Sets the name of the property to get from the DynaBean.
       * @param propertyName the property that this expression reads, not null
       */
      public void setPropertyName(String propertyName) {
          if (propertyName == null) {
              throw new IllegalArgumentException("propertyName is null");
          }
          this.propertyName = propertyName;
      }
  
  }
  
  
  

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