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JaVers - object auditing and diff framework for Java

There is a newer version: 7.6.1

package org.javers.core.graph;

import org.javers.core.metamodel.object.GlobalId;
import org.javers.core.metamodel.object.ValueObjectId;
import org.javers.core.metamodel.object.ValueObjectIdWithHash;
import org.javers.core.metamodel.property.Property;
import org.javers.core.metamodel.type.ManagedType;

import java.util.List;
import java.util.Optional;
import java.util.function.Supplier;
import java.util.stream.Collectors;

import static org.javers.common.validation.Validate.argumentIsNotNull;

/**
 * Wrapper for live client's domain object (aka CDO)
 *
 * @author bartosz walacik
 */
abstract class LiveCdo extends Cdo {
    private GlobalId globalId;

    LiveCdo(GlobalId globalId, ManagedType managedType) {
        super(managedType);
        this.globalId = globalId;
    }

    void enrichHashIfNeeded(LiveCdoFactory liveCdoFactory, Supplier> descendants) {
        if (requiresObjectHasher()) {
            List descendantVOs = descendants.get().stream()
                    .filter(cdo -> cdo.getGlobalId() instanceof ValueObjectId)
                    .collect(Collectors.toList());

            ValueObjectId newId = liveCdoFactory.regenerateValueObjectHash(this, descendantVOs);
            swapId(newId);
        }
    }

    void reloadHashFromParentIfNeeded(LiveCdoFactory liveCdoFactory) {
        if (hasHashOnParent()) {
            ValueObjectIdWithHash id = (ValueObjectIdWithHash)getGlobalId();
            swapId(id.freeze());
        }
    }

    @Override
    public GlobalId getGlobalId() {
        return globalId;
    }

    @Override
    public Object getPropertyValue(String propertyName) {
        argumentIsNotNull(propertyName);
        Property property = getManagedType().getProperty(propertyName);
        return getPropertyValue(property);
    }

    @Override
    public Object getPropertyValue(Property property) {
        argumentIsNotNull(property);
        return property.get(wrappedCdo());
    }

    /**
     * never returns empty
     */
    @Override
    public Optional