Java PropertyUtils.getPropertyDescriptor方法代碼示例

import org.apache.commons.beanutils.PropertyUtils; //導入方法依賴的package包/類
/**
 * Copies all possible properties from source to dest, ignoring the given properties list. Exceptions are ignored
 */
public static void copyProperties(final Object source, final Object dest, final String... ignored) {
    if (source == null || dest == null) {
        return;
    }
    final PropertyDescriptor[] propertyDescriptors = PropertyUtils.getPropertyDescriptors(source);
    for (final PropertyDescriptor sourceDescriptor : propertyDescriptors) {
        try {
            final String name = sourceDescriptor.getName();
            // Check for ignored properties
            if (ArrayUtils.contains(ignored, name)) {
                continue;
            }
            final PropertyDescriptor destProperty = PropertyUtils.getPropertyDescriptor(dest, name);
            if (destProperty.getWriteMethod() == null) {
                // Ignore read-only properties
                continue;
            }
            final Object value = CoercionHelper.coerce(destProperty.getPropertyType(), get(source, name));
            set(dest, name, value);
        } catch (final Exception e) {
            // Ignore this property
        }
    }
}
 

import org.apache.commons.beanutils.PropertyUtils; //導入方法依賴的package包/類
private Object getValueByPropertyName(T t, String propertyName) {
    //通過bean 的 property字段的get方法獲取value
    try {
        PropertyDescriptor propertyDescriptor = PropertyUtils.getPropertyDescriptor(t, propertyName);
        Method method = propertyDescriptor.getReadMethod();
        Object val = method.invoke(t);
        return val;
    } catch (Exception e) {
        e.printStackTrace();
        return null;
    }
}
 

import org.apache.commons.beanutils.PropertyUtils; //導入方法依賴的package包/類
private static void validatePropertySectionPropertyEx(String fileName, String sectionName,
        Object instance, List<Node> columns, String propertyName) throws Exception {
    Assert.assertFalse(fileName + " section '" + sectionName
            + "' should have a description for " + propertyName, columns.get(1)
            .getTextContent().trim().isEmpty());

    final String actualTypeName = columns.get(2).getTextContent().replace("\n", "")
            .replace("\r", "").replaceAll(" +", " ").trim();

    Assert.assertFalse(fileName + " section '" + sectionName + "' should have a type for "
            + propertyName, actualTypeName.isEmpty());

    final PropertyDescriptor descriptor = PropertyUtils.getPropertyDescriptor(instance,
            propertyName);
    final Class<?> clss = descriptor.getPropertyType();
    final String expectedTypeName = getModulePropertyExpectedTypeName(clss, instance,
            propertyName);

    if (expectedTypeName != null) {
        final String expectedValue = getModulePropertyExpectedValue(clss, instance,
                propertyName);

        Assert.assertEquals(fileName + " section '" + sectionName
                + "' should have the type for " + propertyName, expectedTypeName,
                actualTypeName);

        if (expectedValue != null) {
            final String actualValue = columns.get(3).getTextContent().replace("\n", "")
                    .replace("\r", "").replaceAll(" +", " ").trim();

            Assert.assertEquals(fileName + " section '" + sectionName
                    + "' should have the value for " + propertyName, expectedValue,
                    actualValue);
        }
    }
}
 

import org.apache.commons.beanutils.PropertyUtils; //導入方法依賴的package包/類
protected void applyGlobalProperty(Map objects, String property, String value) {
    for (Object instance : objects.values()) {
        try {
            PropertyDescriptor pd = PropertyUtils.getPropertyDescriptor(instance, property);
            if (pd != null) {
                applyProperty(instance, property, value);
            }
        } catch (Exception e) {
            String msg = "Error retrieving property descriptor for instance " +
                    "of type [" + instance.getClass().getName() + "] " +
                    "while setting property [" + property + "]";
            throw new ConfigurationException(msg, e);
        }
    }
}
 

import org.apache.commons.beanutils.PropertyUtils; //導入方法依賴的package包/類
/**
 * Attempt to find the collection property on {@code target} indicated by the {@code propertyName} and then see if the "collection"
 * returned has an {@code add(Object)} method and if it does - invoke it with the {@code toAdd} instance. If any of the parameters are
 * {@code null} then no action is taken.
 *
 * @param target                 The object that has the collection property for which the {@code toAdd} instance will be added.
 * @param collectionPropertyName The name of the Java BeanBO property that will return a collection (may not be a {@link
 *                               java.util.Collection} so long as there is an {@code add(Object)} method). Note that if this returns a
 *                               null value a {@link FlatwormConfigurationException} will be thrown.
 * @param toAdd                  The instance to add to the collection indicated.
 * @throws FlatwormParserException Should the underlying collection referenced by {@code propertyName} be {@code null} or non-existent,
 *                                 should no {@code add(Object)} method exist on the collection and should any error occur while
 *                                 invoking the {@code add(Object)} method if it is found (reflection style errors).
 */
public static void addValueToCollection(Object target, String collectionPropertyName, Object toAdd) throws FlatwormParserException {
    if (target == null || StringUtils.isBlank(collectionPropertyName) || toAdd == null) return;
    try {
        PropertyDescriptor propertyDescriptor = PropertyUtils.getPropertyDescriptor(target, collectionPropertyName);
        if (propertyDescriptor != null) {
            Object collectionInstance = PropertyUtils.getProperty(target, collectionPropertyName);
            if (collectionInstance != null) {
                // Once compiled, generics lose their converterName reference and it defaults to a simple java.lang.Object.class
                // so that's the method parameter we'll search by.
                Method addMethod = propertyDescriptor.getPropertyType().getMethod("add", Object.class);
                if (addMethod != null) {
                    addMethod.invoke(collectionInstance, toAdd);
                } else {
                    throw new FlatwormParserException(String.format(
                            "The collection instance %s for property %s in class %s does not have an add method.",
                            collectionInstance.getClass().getName(), propertyDescriptor.getName(), target.getClass().getName()));
                }
            } else {
                throw new FlatwormParserException(String.format(
                        "Unable to invoke the add method on collection %s as it is currently null for instance %s.",
                        propertyDescriptor.getName(), target.getClass().getName()));
            }
        } else {
            throw new FlatwormParserException(String.format(
                    "%s does not have a getter for property %s - the %s instance could therefore not be added to the collection.",
                    target.getClass().getName(), collectionPropertyName, toAdd.getClass().getName()));
        }
    } catch (Exception e) {
        throw new FlatwormParserException(String.format(
                "Unable to invoke the add method on the collection for property %s in bean %s with object of converterName %s",
                collectionPropertyName, target.getClass().getName(), toAdd.getClass().getName()),
                e);
    }
}
 

import org.apache.commons.beanutils.PropertyUtils; //導入方法依賴的package包/類
/**
 * Use an alternate method that attempts to use reflection to figure out which conversion routine to use.
 *
 * @param bean         The {@link Object} that contains the property.
 * @param beanName     The name of the bean as configured.
 * @param propertyName The name of the property that is to be set.
 * @param fieldChars   The value.
 * @param options      The {@link ConversionOptionBO}s.
 * @return The {@link Object} constructed from the {@code fieldChars} value.
 * @throws FlatwormParserException should parsing the value to a {@link Object} fail for any reason.
 */
public Object convert(Object bean, String beanName, String propertyName, String fieldChars, Map<String, ConversionOptionBO> options)
        throws FlatwormParserException {
    Object value;
    try {
        PropertyDescriptor propDescriptor = PropertyUtils.getPropertyDescriptor(bean, propertyName);
        value = ConverterFunctionCache.convertFromString(propDescriptor.getPropertyType(), fieldChars, options);
    } catch (Exception e) {
        throw new FlatwormParserException(String.format("Failed to convert and set value '%s' on bean %s [%s] for property %s.",
                fieldChars, beanName, bean.getClass().getName(), propertyName), e);
    }
    return value;
}
 

import org.apache.commons.beanutils.PropertyUtils; //導入方法依賴的package包/類
/**
 * Sets any transformation option overrides it can.
 */
private void overrideTransformationOptions(TransformationOptions options)
{
    // Set any transformation options overrides if we can
    if(options != null && transformationOptionOverrides != null)
    {
       for(String key : transformationOptionOverrides.keySet())
       {
          if(PropertyUtils.isWriteable(options, key))
          {
             try 
             {
                PropertyDescriptor pd = PropertyUtils.getPropertyDescriptor(options, key);
                Class<?> propertyClass = pd.getPropertyType();
                
                Object value = transformationOptionOverrides.get(key);
                if(value != null)
                {
                    if(propertyClass.isInstance(value))
                    {
                        // Nothing to do
                    }
                    else if(value instanceof String && propertyClass.isInstance(Boolean.TRUE))
                    {
                        // Use relaxed converter
                        value = TransformationOptions.relaxedBooleanTypeConverter.convert((String)value);
                    }
                    else
                    {
                        value = DefaultTypeConverter.INSTANCE.convert(propertyClass, value);
                    }
                }
                PropertyUtils.setProperty(options, key, value);
             } 
             catch(MethodNotFoundException mnfe) {}
             catch(NoSuchMethodException nsme) {}
             catch(InvocationTargetException ite) {}
             catch(IllegalAccessException iae) {}
          }
          else
          {
             logger.warn("Unable to set override Transformation Option " + key + " on " + options);
          }
       }
    }
}
 

import org.apache.commons.beanutils.PropertyUtils; //導入方法依賴的package包/類
private void setNestedProperty(Object mobileBean, String nestedProperty, String value)
throws Exception
{		
	StringTokenizer st = new StringTokenizer(nestedProperty, ".");
	Object courObj = mobileBean;
			
	while(st.hasMoreTokens())
	{
		String token = st.nextToken();			
		
		PropertyDescriptor metaData = PropertyUtils.getPropertyDescriptor(courObj, token);			
		if(token.indexOf('[')!=-1 && token.indexOf(']')!=-1)
		{
			String indexedPropertyName = token.substring(0, token.indexOf('['));
			metaData = PropertyUtils.getPropertyDescriptor(courObj,indexedPropertyName);
		}
					
		if(!st.hasMoreTokens())
		{	
			if(Collection.class.isAssignableFrom(metaData.getPropertyType()) ||
					   metaData.getPropertyType().isArray())
			{
				//An IndexedProperty						
				courObj = this.initializeIndexedProperty(courObj, token, metaData);															
			}
			
			//Actually set the value of the property
			if(!metaData.getPropertyType().isArray())
			{
				PropertyUtils.setNestedProperty(mobileBean, nestedProperty, 
				ConvertUtils.convert(value, metaData.getPropertyType()));
			}
			else
			{
				PropertyUtils.setNestedProperty(mobileBean, nestedProperty, 
				ConvertUtils.convert(value, metaData.getPropertyType().getComponentType()));
			}
		}
		else
		{							
			if(Collection.class.isAssignableFrom(metaData.getPropertyType()) ||
			   metaData.getPropertyType().isArray())
			{
				//An IndexedProperty						
				courObj = this.initializeIndexedProperty(courObj, token, metaData);
			}				
			else
			{
				//A Simple Property
				courObj = this.initializeSimpleProperty(courObj, token, metaData);										
			}								
		}
	}
}