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From mdigg...@apache.org
Subject cvs commit: jakarta-commons/math/src/test/org/apache/commons/math/stat/univariate BeanListUnivariateImpl.java
Date Tue, 20 Apr 2004 21:02:35 GMT
mdiggory    2004/04/20 14:02:35

  Added:       math/src/test/org/apache/commons/math/stat/univariate
                        BeanListUnivariateImpl.java
  Log:
  BeanListUnivariateImpl was misplaced during the move.
  
  Revision  Changes    Path
  1.1                  jakarta-commons/math/src/test/org/apache/commons/math/stat/univariate/BeanListUnivariateImpl.java
  
  Index: BeanListUnivariateImpl.java
  ===================================================================
  /*
   * Copyright 2003-2004 The Apache Software Foundation.
   * 
   * 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.
   */
  package org.apache.commons.math.stat.univariate;
  
  import java.lang.reflect.InvocationTargetException;
  import java.util.List;
  
  import org.apache.commons.beanutils.PropertyUtils;
  import org.apache.commons.math.MathException;
  import org.apache.commons.math.util.NumberTransformer;
  
  /**
   * This implementation of DescriptiveStatistics uses commons-beanutils to gather
   * univariate statistics for a List of Java Beans by property.  This 
   * implementation uses beanutils' PropertyUtils to get a simple, nested,
   * indexed, mapped, or combined property from an element of a List.
   * @version $Revision: 1.1 $ $Date: 2004/04/20 21:02:35 $
   */
  public class BeanListUnivariateImpl extends ListUnivariateImpl {
  
  	/**
  	 * propertyName of the property to get from the bean
  	 */
  	private String propertyName;
  
  	/**
  	 * Construct a BeanListUnivariate with specified
  	 * backing list
  	 * @param list Backing List
  	 */
  	public BeanListUnivariateImpl(List list) {
  		this(list, null);
  	}
  
  	/**
  	 * Construct a BeanListUnivariate with specified
  	 * backing list and propertyName
  	 * @param list Backing List
  	 * @param propertyName Bean propertyName
  	 */
  	public BeanListUnivariateImpl(List list, String propertyName) {
  		super(list);
  		setPropertyName(propertyName);
  	}
  
  	/**
  	 * @return propertyName
  	 */
  	public String getPropertyName() {
  		return propertyName;
  	}
  
  	/**
  	 * @param propertyName Name of Property
  	 */
  	public void setPropertyName(String propertyName) {
  		this.propertyName = propertyName;
  		this.transformer = new NumberTransformer() {
  
  			/**
  			 * @see org.apache.commons.math.util.NumberTransformer#transform(java.lang.Object)
  			 */
  			public double transform(final Object o) throws MathException {
  				try {
  					return (
  						(Number) PropertyUtils.getProperty(
  							o,
  							getPropertyName()))
  						.doubleValue();
  				} catch (IllegalAccessException e) {
  					throw new MathException(
  						"IllegalAccessException in Transformation: "
  							+ e.getMessage(),
  						e);
  				} catch (InvocationTargetException e) {
  					throw new MathException(
  						"InvocationTargetException in Transformation: "
  							+ e.getMessage(),
  						e);
  				} catch (NoSuchMethodException e) {
  					throw new MathException(
  						"oSuchMethodException in Transformation: "
  							+ e.getMessage(),
  						e);
  				}
  			}
  		};
  	}
  
  	/**
  	  * @see org.apache.commons.math.stat.Univariate#addValue(double)
  	  */
  	public void addValue(double v) {
  		String msg =
  			"The BeanListUnivariateImpl does not accept values "
  				+ "through the addValue method.  Because elements of this list "
  				+ "are JavaBeans, one must be sure to set the 'propertyName' "
  				+ "property and add new Beans to the underlying list via the "
  				+ "addBean(Object bean) method";
  		throw new UnsupportedOperationException(msg);
  	}
  
  	/**
  	 * Adds a bean to this list. 
  	 *
  	 * @param bean Bean to add to the list
  	 */
  	public void addObject(Object bean) {
  		list.add(bean);
  	}
  }
  
  
  

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