| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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.apache.polygene.spi.entitystore.helpers; |
| |
| import java.util.Iterator; |
| import java.util.NoSuchElementException; |
| import javax.json.JsonArray; |
| import javax.json.JsonException; |
| import javax.json.JsonValue; |
| import org.apache.polygene.api.entity.EntityReference; |
| import org.apache.polygene.serialization.javaxjson.JavaxJsonFactories; |
| import org.apache.polygene.spi.entity.ManyAssociationState; |
| import org.apache.polygene.spi.entitystore.EntityStoreException; |
| |
| /** |
| * JSON implementation of ManyAssociationState. |
| * <p>Backed by a JsonArray.</p> |
| */ |
| public final class JSONManyAssociationState |
| implements ManyAssociationState |
| { |
| private final JavaxJsonFactories jsonFactories; |
| private final JSONEntityState entityState; |
| private final String stateName; |
| |
| /* package */ JSONManyAssociationState( JavaxJsonFactories jsonFactories, |
| JSONEntityState entityState, |
| String stateName ) |
| { |
| this.jsonFactories = jsonFactories; |
| this.entityState = entityState; |
| this.stateName = stateName; |
| } |
| |
| private JsonArray getReferences() |
| { |
| JsonValue references = entityState.state().getJsonObject( JSONKeys.VALUE ).get( stateName ); |
| if( references != null && references.getValueType() == JsonValue.ValueType.ARRAY ) |
| { |
| return (JsonArray) references; |
| } |
| return jsonFactories.builderFactory().createArrayBuilder().build(); |
| } |
| |
| @Override |
| public int count() |
| { |
| return getReferences().size(); |
| } |
| |
| @Override |
| public boolean contains( EntityReference entityReference ) |
| { |
| return indexOfReference( entityReference.identity().toString() ) != -1; |
| } |
| |
| @Override |
| public boolean add( int idx, EntityReference entityReference ) |
| { |
| try |
| { |
| if( indexOfReference( entityReference.identity().toString() ) != -1 ) |
| { |
| return false; |
| } |
| entityState.stateCloneAddManyAssociation( idx, stateName, entityReference ); |
| entityState.markUpdated(); |
| return true; |
| } |
| catch( JsonException e ) |
| { |
| throw new EntityStoreException( e ); |
| } |
| } |
| |
| @Override |
| public boolean remove( EntityReference entityReference ) |
| { |
| int refIndex = indexOfReference( entityReference.identity().toString() ); |
| if( refIndex != -1 ) |
| { |
| entityState.stateCloneRemoveManyAssociation( stateName, entityReference ); |
| entityState.markUpdated(); |
| return true; |
| } |
| return false; |
| } |
| |
| @Override |
| public boolean clear() |
| { |
| if( count() > 0 ) |
| { |
| entityState.stateCloneClearManyAssociation( stateName ); |
| entityState.markUpdated(); |
| } |
| return false; |
| } |
| |
| @Override |
| public EntityReference get( int i ) |
| { |
| return EntityReference.parseEntityReference( getReferences().getString( i ) ); |
| } |
| |
| @Override |
| public Iterator<EntityReference> iterator() |
| { |
| return new Iterator<EntityReference>() |
| { |
| private int idx = 0; |
| |
| @Override |
| public boolean hasNext() |
| { |
| return idx < getReferences().size(); |
| } |
| |
| @Override |
| public EntityReference next() |
| { |
| try |
| { |
| EntityReference ref = EntityReference.parseEntityReference( getReferences().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 getReferences().toString(); |
| } |
| |
| private int indexOfReference( String entityIdentityAsString ) |
| { |
| JsonArray references = getReferences(); |
| for( int idx = 0; idx < references.size(); idx++ ) |
| { |
| if( entityIdentityAsString.equals( references.getString( idx, null ) ) ) |
| { |
| return idx; |
| } |
| } |
| return -1; |
| } |
| } |