org.quattor.pan.dml.data

Class Property

java.lang.Object

org.quattor.pan.dml.data.Element

org.quattor.pan.dml.data.PersistentElement

org.quattor.pan.dml.data.Property

All Implemented Interfaces:

Operation

Direct Known Subclasses:

BooleanProperty, NumberProperty, StringProperty

public abstract class Property
extends PersistentElement

Property represents a simple primitive type (boolean, long, or string) in the pan language. All properties descend from PersistentElement which marks them as being valid elements for a final machine configuration. All Property instances must be immutable. This allows properties to be shared between threads and between machine configurations consequently reducing duplication and memory consumption. The constructors of all Property classes should be protected or private. All subclasses must implement a getInstance() method which returns an instance (possibly cached) of the Property.

Author:

loomis

Property Summary

Properties inherited from class org.quattor.pan.dml.data.Element

isProperty

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	Property(Object value) This constructor should be used by subclasses to set the value of the property.

Method Summary

Methods

Modifier and Type	Method and Description
boolean	equals(Object o) Require that all Elements implement an equals method.
Object	getValue() Return the value of this property as an Object.
int	hashCode() Require that all Elements implement the hashCode method.
String	toString() Require that all Elements implement a reasonable toString method.

Methods inherited from class org.quattor.pan.dml.data.Element

checkInvalidSelfContext, checkRange, checkRestrictedContext, checkValidReplacement, defined, duplicate, execute, exists, getTypeAsString, isBoolean, isDouble, isList, isLong, isNlist, isPersistent, isProperty, isProtected, isResource, isString, isTransient, locateUndefinedElement, protect, rget, rgetList, rput, writableCopy

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

Property

protected Property(Object value)

This constructor should be used by subclasses to set the value of the property. The value should be a basic, immutable java type like Boolean, Long, or Double.

Parameters:

value -

Method Detail

getValue

public Object getValue()

Return the value of this property as an Object. Subclasses may override this method to provide a more specific return type. Subclasses will have to call this method to obtain the value because the value itself is private.

Returns:

value of this property as an Object

hashCode

public int hashCode()

Description copied from class: Element

Require that all Elements implement the hashCode method.

Specified by:

hashCode in class Element

equals

public boolean equals(Object o)

Description copied from class: Element

Require that all Elements implement an equals method.

Specified by:

equals in class Element

toString

public String toString()

Description copied from class: Element

Require that all Elements implement a reasonable toString method.

Specified by:

toString in class Element