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/*
* MappingElementImpl.java
*
* Created on March 24, 2000, 10:06 AM
*/
package com.sun.jdo.api.persistence.model.mapping.impl;
import java.beans.*;
import java.util.ResourceBundle;
import java.text.Collator;
import com.sun.jdo.api.persistence.model.ModelException;
import com.sun.jdo.api.persistence.model.ModelVetoException;
import com.sun.jdo.api.persistence.model.mapping.MappingElement;
import com.sun.jdo.spi.persistence.utility.I18NHelper;
/**
*
* @author raccah
* @version %I%
*/
public abstract class MappingElementImpl implements MappingElement
{
/** I18N message handler */
private static final ResourceBundle _messages = I18NHelper.loadBundle(
"com.sun.jdo.api.persistence.model.Bundle", // NOI18N
MappingElementImpl.class.getClassLoader());
/** Property change support */
private PropertyChangeSupport _support;
/** Vetoable change support */
private transient VetoableChangeSupport _vetoableSupport;
String _name;
/** Create new MappingElementImpl with no corresponding name. This
* constructor should only be used for cloning and archiving.
*/
public MappingElementImpl ()
{
this(null);
}
/** Creates new MappingElementImpl with the corresponding name
* @param name the name of the element
*/
public MappingElementImpl (String name)
{
super();
_name = name;
}
/** @return I18N message handler for this element
*/
protected static final ResourceBundle getMessages () { return _messages; }
/** Overrides Object's <code>toString</code> method to return the name
* of this mapping element.
* @return a string representation of the object
*/
public String toString () { return getName(); }
/** Overrides Object's <code>equals</code> method by comparing the name of this mapping element
* with the name of the argument obj. The method returns <code>false</code> if obj does not have
* the same dynamic type as this mapping element.
* @return <code>true</code> if this object is the same as the obj argument; <code>false</code> otherwise.
* @param obj the reference object with which to compare.
*/
public boolean equals(Object obj)
{
if (obj == null)
return false;
if (obj == this)
return true;
// check for the right class and then do the name check by calling compareTo.
return (getClass() == obj.getClass()) && (compareTo(obj) == 0);
}
/** Overrides Object's <code>hashCode</code> method to return the hashCode of this mapping element's name.
* @return a hash code value for this object.
*/
public int hashCode()
{
return (getName()==null) ? 0 : getName().hashCode();
}
/** Fires property change event.
* @param name property name
* @param o old value
* @param n new value
*/
protected void firePropertyChange (String name, Object o, Object n)
{
if (_support != null)
_support.firePropertyChange(name, o, n);
}
/** Fires vetoable change event.
* @param name property name
* @param o old value
* @param n new value
* @exception PropertyVetoException when the change is vetoed by a listener
*/
protected void fireVetoableChange (String name, Object o, Object n)
throws PropertyVetoException
{
if (_vetoableSupport != null)
_vetoableSupport.fireVetoableChange(name, o, n);
}
//================= implementation of MappingElement ================
/** Add a property change listener.
* @param l the listener to add
*/
public synchronized void addPropertyChangeListener
(PropertyChangeListener l)
{
if (_support == null)
{
synchronized(this)
{
// new test under synchronized block
if (_support == null)
_support = new PropertyChangeSupport(this);
}
}
_support.addPropertyChangeListener(l);
}
/** Remove a property change listener.
* @param l the listener to remove
*/
public void removePropertyChangeListener (PropertyChangeListener l)
{
if (_support != null)
_support.removePropertyChangeListener(l);
}
/** Add a vetoable change listener.
* @param l the listener to add
*/
public synchronized void addVetoableChangeListener
(VetoableChangeListener l)
{
if (_vetoableSupport == null)
_vetoableSupport = new VetoableChangeSupport(this);
_vetoableSupport.addVetoableChangeListener(l);
}
/** Remove a vetoable change listener.
* @param l the listener to remove
*/
public synchronized void removeVetoableChangeListener (
VetoableChangeListener l)
{
if (_vetoableSupport != null)
_vetoableSupport.removeVetoableChangeListener(l);
}
/** Get the name of this mapping element.
* @return the name
*/
public String getName () { return _name; }
/** Set the name of this mapping element.
* @param name the name
* @exception ModelException if impossible
*/
public void setName (String name) throws ModelException
{
String old = getName();
try
{
fireVetoableChange(PROP_NAME, old, name);
_name = name;
firePropertyChange(PROP_NAME, old, name);
}
catch (PropertyVetoException e)
{
throw new ModelVetoException(e);
}
}
//================= implementation of Comparable ================
/** Compares this object with the specified object for order. Returns a negative integer, zero,
* or a positive integer as this object is less than, equal to, or greater than the specified object.
* The specified object must be mapping element, meaning it must be an instance of class
* MappingElementImpl or any subclass. If not a ClassCastException is thrown.
* The order of MappingElementImpl objects is defined by the order of their names.
* Mapping elements without name are considered to be less than any named mapping element.
* @param o the Object to be compared.
* @return a negative integer, zero, or a positive integer as this object is less than, equal to,
* or greater than the specified object.
* @exception ClassCastException - if the specified object is null or is not an instance of MappingElementImpl
*/
public int compareTo(Object o)
{
// null is not allowed
if (o == null)
throw new ClassCastException();
if (o == this)
return 0;
String thisName = getName();
// the following statement throws a ClassCastException if o is not a MappingElementImpl
String otherName = ((MappingElementImpl)o).getName();
// if this does not have a name it should compare less than any named object
if (thisName == null)
return (otherName == null) ? 0 : -1;
// if this is named and o does not have a name it should compare greater
if (otherName == null)
return 1;
// now we know that this and o are named mapping elements =>
// use locale-sensitive String comparison
int ret = Collator.getInstance().compare(thisName, otherName);
// if both names are equal, both objects might have different types.
// If so order both objects by their type names (necessary to be consistent with equals)
if ((ret == 0) && (getClass() != o.getClass()))
ret = getClass().getName().compareTo(o.getClass().getName());
return ret;
}
}
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