| /* |
| * 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 java.util.Iterator; |
| import java.util.NoSuchElementException; |
| 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; |
| |
| /** |
| * JSON implementation of ManyAssociationState. |
| * <p>Backed by a JSONArray.</p> |
| */ |
| public final class JSONManyAssociationState |
| implements ManyAssociationState |
| { |
| |
| private final JSONEntityState entityState; |
| private final JSONArray references; |
| |
| public JSONManyAssociationState( JSONEntityState entityState, JSONArray references ) |
| { |
| this.entityState = entityState; |
| this.references = references; |
| } |
| |
| @Override |
| public int count() |
| { |
| return references.length(); |
| } |
| |
| @Override |
| public boolean contains( EntityReference entityReference ) |
| { |
| return indexOfReference( entityReference.identity() ) != -1; |
| } |
| |
| @Override |
| public boolean add( int idx, EntityReference entityReference ) |
| { |
| try |
| { |
| if( indexOfReference( entityReference.identity() ) != -1 ) |
| { |
| return false; |
| } |
| entityState.cloneStateIfGlobalStateLoaded(); |
| insertReference( idx, entityReference.identity() ); |
| entityState.markUpdated(); |
| return true; |
| } |
| catch( JSONException e ) |
| { |
| throw new EntityStoreException( e ); |
| } |
| } |
| |
| @Override |
| public boolean remove( EntityReference entityReference ) |
| { |
| int refIndex = indexOfReference( entityReference.identity() ); |
| if( refIndex != -1 ) |
| { |
| entityState.cloneStateIfGlobalStateLoaded(); |
| references.remove( refIndex ); |
| entityState.markUpdated(); |
| return true; |
| } |
| return false; |
| } |
| |
| @Override |
| public EntityReference get( int i ) |
| { |
| try |
| { |
| return new EntityReference( references.getString( i ) ); |
| } |
| catch( JSONException e ) |
| { |
| throw new EntityStoreException( e ); |
| } |
| } |
| |
| @Override |
| public Iterator<EntityReference> iterator() |
| { |
| return new Iterator<EntityReference>() |
| { |
| private int idx = 0; |
| |
| @Override |
| public boolean hasNext() |
| { |
| return idx < references.length(); |
| } |
| |
| @Override |
| public EntityReference next() |
| { |
| try |
| { |
| EntityReference ref = new EntityReference( references.getString( idx ) ); |
| idx++; |
| return ref; |
| } |
| catch( JSONException e ) |
| { |
| throw new NoSuchElementException(); |
| } |
| } |
| |
| @Override |
| public void remove() |
| { |
| throw new UnsupportedOperationException( "remove() is not supported on ManyAssociation iterators." ); |
| } |
| }; |
| } |
| |
| @Override |
| public String toString() |
| { |
| return references.toString(); |
| } |
| |
| private int indexOfReference( Object item ) |
| { |
| for( int idx = 0; idx < references.length(); idx++ ) |
| { |
| if( item.equals( references.opt( idx ) ) ) |
| { |
| return idx; |
| } |
| } |
| return -1; |
| } |
| |
| private void insertReference( int insert, Object item ) |
| throws JSONException |
| { |
| if( insert < 0 || insert > references.length() ) |
| { |
| throw new JSONException( "JSONArray[" + insert + "] is out of bounds." ); |
| } |
| if( insert == references.length() ) |
| { |
| // append |
| references.put( item ); |
| } |
| else |
| { |
| // insert (copy/insert/apply) |
| JSONArray output = new JSONArray(); |
| for( int idx = 0; idx < references.length(); idx++ ) |
| { |
| if( idx == insert ) |
| { |
| output.put( item ); |
| } |
| output.put( references.opt( idx ) ); |
| } |
| for( int idx = 0; idx < output.length(); idx++ ) |
| { |
| references.put( idx, output.opt( idx ) ); |
| } |
| } |
| } |
| } |