Moving BeanTransformer to Experimental

git-svn-id: https://svn.apache.org/repos/asf/jakarta/commons/proper/math/trunk/src/experimental@141260 13f79535-47bb-0310-9956-ffa450edef68

org/apache/commons/math/util/BeanTransformer.java

@@ -0,0 +1,79 @@
+/*
+ * 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.util;
+
+import java.lang.reflect.InvocationTargetException;
+import org.apache.commons.math.MathException;
+import org.apache.commons.beanutils.PropertyUtils;
+
+/**
+ * Uses PropertyUtils to map a Bean getter to a double value.
+ * @version $Revision: 1.1 $ $Date: 2004/06/01 22:10:17 $
+ */
+public class BeanTransformer implements NumberTransformer {
+
+    /**
+     * The propertyName for this Transformer
+     */
+    private String propertyName;
+
+    /**
+     * Create a BeanTransformer
+     */
+    public BeanTransformer() {
+        this(null);
+    }
+
+    /**
+     * Create a BeanTransformer with a specific PropertyName.
+     * @param property The property.
+     */
+    public BeanTransformer(final String property) {
+        super();
+        setPropertyName(property);
+    }
+
+    /**
+     * Get the property String
+     * @return the Property Name String
+     */
+    public String getPropertyName() {
+        return propertyName;
+    }
+
+    /**
+     * Set the propertyString
+     * @param string The string to set the property to.
+     */
+    public void setPropertyName(final String string) {
+        propertyName = string;
+    }
+
+    /**
+     * @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);
+        }
+    }
+}

org/apache/commons/math/util/BeanTransformerTest.java

@@ -0,0 +1,94 @@
+/*
+ * 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.util;
+
+import org.apache.commons.math.MathException;
+import org.apache.commons.math.TestUtils;
+
+import junit.framework.TestCase;
+
+/**
+ * @version $Revision: 1.1 $ $Date: 2004/06/01 22:10:17 $
+ */
+public class BeanTransformerTest extends TestCase {
+
+    /**
+     *
+     */
+    public void testConstructor(){
+        BeanTransformer b = new BeanTransformer();
+        assertNull(b.getPropertyName());
+    }
+
+    /**
+     *
+     */
+    public void testConstructorString(){
+        String name = "property";
+        BeanTransformer b = new BeanTransformer(name);
+        assertEquals(name, b.getPropertyName());
+    }
+
+    /**
+     *
+     */
+    public void testSetPropertyName(){
+        String name = "property";
+        BeanTransformer b = new BeanTransformer();
+        b.setPropertyName(name);
+        assertEquals(name, b.getPropertyName());
+    }
+
+    /**
+     * 
+     */
+    public void testTransformNoSuchMethod(){
+        BeanTransformer b = new BeanTransformer("z");
+        TestBean target = new TestBean();
+		try {
+		    b.transform(target);
+			fail("Expecting MathException");
+		} catch (MathException e) {
+			// expected
+		}
+    }
+
+    /**
+     * 
+     */
+    public void testTransform() throws Exception {
+        BeanTransformer b = new BeanTransformer("x");
+        TestBean target = new TestBean();
+		double value = Double.NaN;
+		value = b.transform(target);
+		TestUtils.assertEquals(1.0, value, 1.0e-2);
+    }
+
+    /**
+     * 
+     */
+    public void testTransformInvalidType() throws Exception {
+        BeanTransformer b = new BeanTransformer("y");
+        TestBean target = new TestBean();
+        try {
+			b.transform(target);
+            fail("Expecting ClassCastException");
+        } catch(ClassCastException ex){
+            // success
+        }
+    }
+}