BeanListUnivariateImpl was misplaced during the move.

git-svn-id: https://svn.apache.org/repos/asf/jakarta/commons/proper/math/trunk@141179 13f79535-47bb-0310-9956-ffa450edef68

src/java/org/apache/commons/math/stat/univariate/BeanListUnivariateImpl.java

@@ -0,0 +1,124 @@
+/*
+ * 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 21:01:35 $
+ */
+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);
+	}
+}