File	Doc	Category	Size	Date	Package
ConstantObject.java	API Doc	Example	4172	Sun Dec 14 22:47:32 GMT 2003	oreilly.hcj.constants

ConstantObject

• java.lang.Object

Fields Summary
private static final Map	CONSTANTS_MASTER_INDEX Holds the grand constants index map. Contains references to all constants indexes that are instantiated indexed by constant name.
private static final long	serialVersionUID Use serialVersionUID for interoperability.
private static final String	ERR_DUP_NAME Error message when user passes a name that is already defined for this class.
private final String	name Holds value of property name.

Constructors Summary

protected ConstantObject(String name) Creates a new instance of ConstantObject. param name The name for the constant object. throws NullPointerException If null is given for the constant name. throws IllegalArgumentException If the user passes a null name. if (name == null) { throw new NullPointerException("The name may not be null."); //$NON-NLS-1$ } Map constMap = (Map)CONSTANTS_MASTER_INDEX.get(getClass()); if (constMap == null) { constMap = new HashMap(); CONSTANTS_MASTER_INDEX.put(getClass(), constMap); } if (constMap.containsKey(name)) { throw new IllegalArgumentException(ERR_DUP_NAME); } this.name = name; constMap.put(name, this);

Methods Summary
public final java.lang.String	getName() Getter for property name. return Value of property name. return this.name;
public static final oreilly.hcj.constants.ConstantObject	lookup(java.lang.Class dataType, java.lang.String name) Get the constant for the given class and id. param dataType The class for which to retrieve the index. param name The name of the constant. return The constant object for the given class and name. return (ConstantObject)((Map)CONSTANTS_MASTER_INDEX.get(dataType)).get(name);
public static final java.util.Map	lookup(java.lang.Class dataType) Get the constants index for the given class. param dataType The class for which to retrieve the index. return An unmodifiable map of constants for the given class. return Collections.unmodifiableMap((Map)CONSTANTS_MASTER_INDEX.get(dataType));
protected java.lang.Object	readResolve() Resolve a read in object. return The resolved object read in. throws ObjectStreamException if there is a problem reading the object. throws RuntimeException If the read object doesnt exist. Object result = lookup(getClass(), getName()); if (result == null) { throw new RuntimeException("Constant not found for name: " + getName()); //$NON-NLS-1$ } return result;
public java.lang.String	toString() see java.lang.Object#toString() return this.getClass() .getName() + "." + this.name;