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/*
* FieldGroupElement.java
*
* Created on February 29, 2000, 4:57 PM
*/
package com.sun.jdo.api.persistence.model.jdo;
import com.sun.jdo.api.persistence.model.ModelException;
/**
*
* @author raccah
* @version %I%
*/
public abstract class FieldGroupElement extends PersistenceMemberElement
implements FieldElementHolder
{
/** Create new FieldGroupElement with no implementation.
* This constructor should only be used for cloning and archiving.
*/
public FieldGroupElement ()
{
this(null, null);
}
/** Create new FieldGroupElement with the provided implementation. The
* implementation is responsible for storing all properties of the object.
* @param impl the implementation to use
* @param declaringClass the class to attach to
*/
public FieldGroupElement (FieldGroupElement.Impl impl,
PersistenceClassElement declaringClass)
{
super(impl, declaringClass);
}
/** @return implemetation factory for this field group
*/
final Impl getFieldGroupImpl () { return (Impl)getImpl(); }
//================== Fields ===============================
// PersistenceFieldElement handling, implementation of FieldElementHolder
/** Add the supplied field to the collection of fields maintained by this
* holder.
* @param field the field to be added
* @exception ModelException if impossible
*/
public void addField (PersistenceFieldElement field)
throws ModelException
{
addFields(new PersistenceFieldElement[]{field});
}
/** Add the supplied fields to the collection of fields maintained by this
* holder.
* @param fields the array of fields to be added
* @exception ModelException if impossible
*/
public void addFields(PersistenceFieldElement[] fields)
throws ModelException
{
getFieldGroupImpl().changeFields(fields, Impl.ADD);
}
/** Remove the supplied field from the collection of fields maintained by
* this holder.
* @param field the field to be removed
* @exception ModelException if impossible
*/
public void removeField (PersistenceFieldElement field)
throws ModelException
{
removeFields(new PersistenceFieldElement[]{field});
}
/** Removed the supplied fields from the collection of fields maintained
* by this holder.
* @param fields the array of fields to be removed
* @exception ModelException if impossible
*/
public void removeFields (PersistenceFieldElement[] fields)
throws ModelException
{
getFieldGroupImpl().changeFields(fields, Impl.REMOVE);
}
/** Returns the collection of fields maintained by this holder in the form
* of an array.
* @return the fields maintained by this holder
*/
public PersistenceFieldElement[] getFields ()
{
return getFieldGroupImpl().getFields();
}
/** Sets the collection of fields maintained by this holder to the contents
* of the supplied array.
* @param fields the fields maintained by this holder
* @exception ModelException if impossible
*/
public void setFields (PersistenceFieldElement[] fields)
throws ModelException
{
getFieldGroupImpl().changeFields(fields, Impl.SET);
}
/** Returns the field with the supplied name from the collection of fields
* maintained by this holder.
* @param name the name of the field to be found
* @return the field with the supplied name, null if none exists
*/
public PersistenceFieldElement getField (String name)
{
return getFieldGroupImpl().getField(name);
}
/** Tests whether the supplied field is in the collection of fields
* maintained by this holder.
* @param field the field to be tested
*/
public boolean containsField (PersistenceFieldElement field)
{
return (getFieldGroupImpl().getField(field.getName()) != null);
}
/** Pluggable implementation of the storage of field element properties.
* @see PersistenceFieldElement#PersistenceFieldElement
*/
public interface Impl extends PersistenceMemberElement.Impl
{
/** Change the set of fields.
* @param fields the new fields
* @param action {@link #ADD}, {@link #REMOVE}, or {@link #SET}
* @exception ModelException if impossible
*/
public void changeFields (PersistenceFieldElement[] fields, int action)
throws ModelException;
/** Get all fields.
* @return the fields
*/
public PersistenceFieldElement[] getFields ();
/** Find a field by name.
* @param name the name to match
* @return the field, or null if it does not exist
*/
public PersistenceFieldElement getField (String name);
}
}