org.apache.cayenne.reflect.valueholder.ValueHolderMapProperty Maven / Gradle / Ivy

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 *  to you under the Apache License, Version 2.0 (the
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package org.apache.cayenne.reflect.valueholder;

import java.util.Map;

import org.apache.cayenne.Persistent;
import org.apache.cayenne.ValueHolder;
import org.apache.cayenne.reflect.Accessor;
import org.apache.cayenne.reflect.ClassDescriptor;
import org.apache.cayenne.reflect.PropertyException;
import org.apache.cayenne.reflect.ToManyMapProperty;
import org.apache.cayenne.util.PersistentObjectMap;

/**
 * @since 3.0
 */
class ValueHolderMapProperty extends ValueHolderToManyProperty implements
        ToManyMapProperty {

    private Accessor mapKeyAccessor;

    ValueHolderMapProperty(ClassDescriptor owner, ClassDescriptor targetDescriptor,
            Accessor accessor, String reverseName, Accessor mapKeyAccessor) {
        super(owner, targetDescriptor, accessor, reverseName);
        this.mapKeyAccessor = mapKeyAccessor;
    }

    @Override
    public void addTarget(Object source, Object target, boolean setReverse) {

        if (target == null) {
            throw new NullPointerException("Attempt to add null object.");
        }

        // Now do the rest of the normal handling (regardless of whether it was
        // flattened or not)
        Map collection = (Map) readProperty(source);
        collection.put(getMapKey(target), target);

        if (setReverse) {
            setReverse(source, null, target);
        }
    }
    
    @Override
    public void addTargetDirectly(Object source, Object target) throws PropertyException {
        PersistentObjectMap collection = (PersistentObjectMap) readProperty(source);
        collection.putDirectly(getMapKey(target), target);
    }

    @Override
    public void removeTarget(Object source, Object target, boolean setReverse) {

        // Now do the rest of the normal handling (regardless of whether it was
        // flattened or not)
        Map collection = (Map) readProperty(source);
        collection.remove(getMapKey(target));

        if (target != null && setReverse) {
            setReverse(source, target, null);
        }
    }
    
    @Override
    public void removeTargetDirectly(Object source, Object target) throws PropertyException {
        PersistentObjectMap collection = (PersistentObjectMap) readProperty(source);
        collection.removeDirectly(getMapKey(target));
    }

    @Override
    protected ValueHolder createCollectionValueHolder(Object object)
            throws PropertyException {
        if (!(object instanceof Persistent)) {

            throw new PropertyException(
                    "ValueHolders for non-persistent objects are not supported.",
                    this,
                    object);
        }

        return new PersistentObjectMap((Persistent) object, getName(), mapKeyAccessor);
    }

    public Object getMapKey(Object target) throws PropertyException {
        return mapKeyAccessor.getValue(target);
    }
}