# AssociationRecordInsertionCascader.java

    package org.codefilarete.stalactite.engine.runtime;

    import java.util.Collection;
    import java.util.stream.Collectors;

    import org.codefilarete.reflection.Accessor;
    import org.codefilarete.stalactite.engine.cascade.AfterInsertCollectionCascader;
    import org.codefilarete.stalactite.mapping.EntityMapping;

    import static org.codefilarete.tool.collection.Iterables.stream;

    /**
     * @author Guillaume Mary
     */
    public class AssociationRecordInsertionCascader<SRC, TRGT, SRCID, TRGTID, C extends Collection<TRGT>>
    		extends AfterInsertCollectionCascader<SRC, AssociationRecord> {

    	private final Accessor<SRC, C> collectionGetter;
    	private final EntityMapping<SRC, SRCID, ?> mappingStrategy;
    	private final EntityMapping<TRGT, TRGTID, ?> targetStrategy;

    	public AssociationRecordInsertionCascader(AssociationRecordPersister<AssociationRecord, ?> persister,
    											  Accessor<SRC, C> collectionGetter,
    											  EntityMapping<SRC, SRCID, ?> mappingStrategy,
    											  EntityMapping<TRGT, TRGTID, ?> targetStrategy) {
    		super(persister);
    		this.collectionGetter = collectionGetter;
    		this.mappingStrategy = mappingStrategy;
    		this.targetStrategy = targetStrategy;
    	}

    	@Override
    	protected void postTargetInsert(Iterable<? extends AssociationRecord> entities) {
    		// Nothing to do. Identified#isPersisted flag should be fixed by target persister
    	}

    	@Override
    	protected Collection<AssociationRecord> getTargets(SRC src) {
    		Collection<TRGT> targets = collectionGetter.get(src);
    		// We only insert non-persisted instances (for logic and to prevent duplicate primary key error)
    		return stream(targets)
    				.map(target -> new AssociationRecord(mappingStrategy.getId(src), targetStrategy.getId(target)))
    				.collect(Collectors.toList());
    	}
    }