org.datanucleus.store.rdbms.mapping.java.MultiPersistableMapping Maven / Gradle / Ivy

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Plugin for DataNucleus providing persistence to RDBMS datastores.
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/**********************************************************************
Copyright (c) 2012 Andy Jefferson and others. 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.

Contributors:
    ...
**********************************************************************/
package org.datanucleus.store.rdbms.mapping.java;

import java.sql.PreparedStatement;
import java.sql.ResultSet;

import org.datanucleus.ClassLoaderResolver;
import org.datanucleus.ExecutionContext;
import org.datanucleus.api.ApiAdapter;
import org.datanucleus.exceptions.NotYetFlushedException;
import org.datanucleus.exceptions.NucleusObjectNotFoundException;
import org.datanucleus.exceptions.NucleusUserException;
import org.datanucleus.identity.IdentityUtils;
import org.datanucleus.metadata.AbstractMemberMetaData;
import org.datanucleus.metadata.MetaDataManager;
import org.datanucleus.metadata.RelationType;
import org.datanucleus.state.ObjectProvider;
import org.datanucleus.store.rdbms.exceptions.NullValueException;
import org.datanucleus.store.rdbms.table.Column;
import org.datanucleus.util.Localiser;
import org.datanucleus.util.NucleusLogger;

/**
 * Extension of MultiMapping where the actual mapping represents multiple possible persistable types
 * such as with an interface/reference field. For example, with an interface mapping we have say 3 known
 * implementations of the interface, so this mapping represents 3 FKs. A maximum of one will be set
 * and the others null.
 */
public abstract class MultiPersistableMapping extends MultiMapping
{
    /**
     * Convenience accessor for the number of the java type mapping where the passed value would be
     * stored. If no suitable mapping is found will return -1. If is a persistent interface then will
     * return -2 meaning persist against *any* mapping
     * @param ec ExecutionContext
     * @param value The value
     * @return The index of javaTypeMappings to use (if any), or -1 (none), or -2 (any)
     */
    protected int getMappingNumberForValue(ExecutionContext ec, Object value)
    {
        if (value == null)
        {
            return -1;
        }

        ClassLoaderResolver clr = ec.getClassLoaderResolver();

        // Find the appropriate mapping
        for (int i=0; i= pos.length)
                {
                    n = 0; // store all implementations to the same columns, so we reset the index
                }
                if (javaTypeMappings[i].getReferenceMapping() != null)
                {
                    posMapping = new int[javaTypeMappings[i].getReferenceMapping().getNumberOfDatastoreMappings()];
                }
                else
                {
                    posMapping = new int[javaTypeMappings[i].getNumberOfDatastoreMappings()];
                }
                for (int j=0; j= pos.length)
            {
                //this means we store all implementations to the same columns, so we reset the index
                n = 0;
            }

            if (javaTypeMappings[i].getReferenceMapping() != null)
            {
                posMapping = new int[javaTypeMappings[i].getReferenceMapping().getNumberOfDatastoreMappings()];
            }
            else
            {
                posMapping = new int[javaTypeMappings[i].getNumberOfDatastoreMappings()];
            }
            for (int j=0; j