SingleCollectionExpression.java

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Copyright (c) 2015 Renato Garcia 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

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    ...
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package org.datanucleus.store.rdbms.sql.expression;

import org.datanucleus.store.rdbms.mapping.java.JavaTypeMapping;
import org.datanucleus.store.rdbms.mapping.java.SingleCollectionMapping;
import org.datanucleus.store.rdbms.sql.SQLStatement;
import org.datanucleus.store.rdbms.sql.SQLTable;

/**
 * Cover-all expression to represent "single collection" mapped types.
 * Note that we should split this up if we ever want to have methods on particular types.
 * For example we could have OptionalExpression and provide methods "isPresent" and "get".
 */
public class SingleCollectionExpression extends DelegatedExpression
{
    protected SQLExpression[] wrappedExpressions;

    public SingleCollectionExpression(SQLStatement stmt, SQLTable table, JavaTypeMapping mapping)
    {
        super(stmt, table, mapping);
        SingleCollectionMapping wcm = (SingleCollectionMapping) mapping;

        JavaTypeMapping wrappedMapping = wcm.getWrappedMapping();
        if (wrappedMapping != null)
        {
            delegate = stmt.getSQLExpressionFactory().newExpression(stmt, table, wrappedMapping);
        }
    }
}