/*
* Copyright (c) 2009, Rickard Öberg. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package org.qi4j.spi.entitystore.helpers;
import org.json.JSONArray;
import org.json.JSONException;
import org.qi4j.api.entity.EntityReference;
import org.qi4j.spi.entity.ManyAssociationState;
import org.qi4j.spi.entitystore.EntityStoreException;
import java.util.Iterator;
import java.util.NoSuchElementException;
/**
* JSON implementation of ManyAssociationState. Backed by JSONArray.
*/
public final class JSONManyAssociationState
implements ManyAssociationState
{
private JSONEntityState entityState;
private JSONArray references;
public JSONManyAssociationState( JSONEntityState entityState, JSONArray references )
{
this.entityState = entityState;
this.references = references;
}
public int count()
{
return references.length();
}
public boolean contains( EntityReference entityReference )
{
try
{
for( int i = 0; i < references.length(); i++ )
{
if( references.get( i ).equals( entityReference.identity() ) )
{
return true;
}
}
return false;
}
catch( JSONException e )
{
throw new EntityStoreException( e );
}
}
public boolean add( int idx, EntityReference entityReference )
{
try
{
if( contains( entityReference ) )
{
return false;
}
entityState.cloneStateIfGlobalStateLoaded();
references.insert( idx, entityReference.identity() );
entityState.markUpdated();
return true;
}
catch( JSONException e )
{
throw new EntityStoreException( e );
}
}
public boolean remove( EntityReference entityReference )
{
try
{
for( int i = 0; i < references.length(); i++ )
{
if( references.get( i ).equals( entityReference.identity() ) )
{
entityState.cloneStateIfGlobalStateLoaded();
references.remove( i );
entityState.markUpdated();
return true;
}
}
return false;
}
catch( JSONException e )
{
throw new EntityStoreException( e );
}
}
public EntityReference get( int i )
{
try
{
return new EntityReference( references.getString( i ) );
}
catch( JSONException e )
{
throw new EntityStoreException( e );
}
}
public Iterator<EntityReference> iterator()
{
return new Iterator<EntityReference>()
{
int idx = 0;
public boolean hasNext()
{
return idx < references.length();
}
public EntityReference next()
{
try
{
EntityReference ref = new EntityReference( references.getString( idx ) );
idx++;
return ref;
}
catch( JSONException e )
{
throw new NoSuchElementException();
}
}
public void remove()
{
throw new UnsupportedOperationException( "remove() is not supported on ManyAssociation iterators." );
}
};
}
}