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## org.apache.log4j.config
Class PropertySetter

    java.lang.Object
      |
      +--org.apache.log4j.config.PropertySetter

public class PropertySetter
extends Object

General purpose Object property setter. Clients repeatedly invokes `setProperty(name,value)` in order to invoke setters on the Object specified in the constructor. This class relies on the JavaBeans `Introspector` to analyze the given Object Class using reflection.

Usage:

    PropertySetter ps = new PropertySetter(anObject);
    ps.set("name", "Joe");
    ps.set("age", "32");
    ps.set("isMale", "true");

will cause the invocations anObject.setName("Joe"), anObject.setAge(32), and setMale(true) if such methods exist with those signatures. Otherwise an `IntrospectionException` are thrown.

Since:
  1.1
Author:
  Anders Kristensen

Field Summary
`protected Object` | `obj`
`protected PropertyDescriptor[]` | `props`

Constructor Summary
`PropertySetter(Object obj)` Create a new PropertySetter for the specified Object.

Method Summary
`void` | `activate()`
`protected Object` | `convertArg(String val, Class type)` Convert `val` a String parameter to an object of a given type.
`protected PropertyDescriptor` | `getPropertyDescriptor(String name)`
`protected void` | `introspect()` Uses JavaBeans `Introspector` to computer setters of object to be configured.
`static void` | `setProperties(Object obj, Properties properties, String prefix)` Set the properties of an object passed as a parameter in one go.
`void` | `setProperties(Properties properties, String prefix)` Set the properites for the object that match the `prefix` passed as parameter.
`void` | `setProperty(PropertyDescriptor prop, String name, String value)` Set the named property given a `PropertyDescriptor`.
`void` | `setProperty(String name, String value)` Set a property on this PropertySetter's Object.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### obj

    protected Object obj

### props

    protected PropertyDescriptor[] props

Constructor Detail

### PropertySetter

    public PropertySetter(Object obj)

  Create a new PropertySetter for the specified Object. This is done in prepartion for invoking `setProperty(java.lang.String, java.lang.String)` one or more times.
  Parameters:
    `obj` - the object for which to set properties

Method Detail

### introspect

    protected void introspect()

  Uses JavaBeans `Introspector` to computer setters of object to be configured.

### setProperties

    public static void setProperties(Object obj,
                                     Properties properties,
                                     String prefix)

  Set the properties of an object passed as a parameter in one go. The `properties` are parsed relative to a `prefix`.
  Parameters:
    `obj` - The object to configure.
    `properties` - A java.util.Properties containing keys and values.
    `prefix` - Only keys having the specified prefix will be set.

### setProperties

    public void setProperties(Properties properties,
                              String prefix)

  Set the properites for the object that match the `prefix` passed as parameter.

### setProperty

    public void setProperty(String name,
                            String value)

  Set a property on this PropertySetter's Object. If successful, this method will invoke a setter method on the underlying Object. The setter is the one for the specified property name and the value is determined partly from the setter argument type and partly from the value specified in the call to this method.

  If the setter expects a String no conversion is necessary. If it expects an int, then an attempt is made to convert 'value' to an int using new Integer(value). If the setter expects a boolean, the conversion is by new Boolean(value).

  Parameters:
    `name` - name of the property
    `value` - String value of the property

### setProperty

    public void setProperty(PropertyDescriptor prop,
                            String name,
                            String value)
                     throws PropertySetterException

  Set the named property given a `PropertyDescriptor`.
  Parameters:
    `prop` - A PropertyDescriptor describing the characteristics of the property to set.
    `name` - The named of the property to set.
    `value` - The value of the property.

### convertArg

    protected Object convertArg(String val,
                                Class type)

  Convert `val` a String parameter to an object of a given type.

### getPropertyDescriptor

    protected PropertyDescriptor getPropertyDescriptor(String name)

### activate

    public void activate()

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Copyright 2000-2005 Apache Software Foundation.