Examples with ArrayExpression org.datanucleus.store.rdbms.sql.expression.ArrayExpression used on opensource projects

Example 1 with ArrayExpression

use of org.datanucleus.store.rdbms.sql.expression.ArrayExpression in project datanucleus-rdbms by datanucleus.

the class ArrayContainsMethod method getExpression.

/* (non-Javadoc)
     * @see org.datanucleus.store.rdbms.sql.method.SQLMethod#getExpression(org.datanucleus.store.rdbms.sql.expression.SQLExpression, java.util.List)
     */
public SQLExpression getExpression(SQLStatement stmt, SQLExpression expr, List<SQLExpression> args) {
    if (args == null || args.size() != 1) {
        throw new NucleusException("Incorrect arguments for Array.contains(SQLExpression)");
    }
    ClassLoaderResolver clr = stmt.getQueryGenerator().getClassLoaderResolver();
    SQLExpressionFactory exprFactory = stmt.getSQLExpressionFactory();
    ArrayExpression arrExpr = (ArrayExpression) expr;
    SQLExpression elemExpr = args.get(0);
    if (elemExpr.isParameter()) {
        // Element is a parameter so make sure its type is set
        AbstractMemberMetaData mmd = arrExpr.getJavaTypeMapping().getMemberMetaData();
        if (mmd != null) {
            stmt.getQueryGenerator().bindParameter(elemExpr.getParameterName(), mmd.getType().getComponentType());
        }
    }
    if (expr instanceof ArrayLiteral) {
        if (elemExpr instanceof UnboundExpression) {
            Class elemCls = clr.classForName(arrExpr.getJavaTypeMapping().getType()).getComponentType();
            elemExpr = stmt.getQueryGenerator().bindVariable((UnboundExpression) elemExpr, elemCls);
        }
        ArrayLiteral lit = (ArrayLiteral) expr;
        Object array = lit.getValue();
        JavaTypeMapping m = exprFactory.getMappingForType(boolean.class, true);
        if (array == null || Array.getLength(array) == 0) {
            return exprFactory.newLiteral(stmt, m, true).eq(exprFactory.newLiteral(stmt, m, false));
        }
        if (arrExpr.isParameter()) {
            stmt.getQueryGenerator().useParameterExpressionAsLiteral((ArrayLiteral) arrExpr);
        }
        boolean useInExpression = false;
        List<SQLExpression> collElementExprs = lit.getElementExpressions();
        if (collElementExprs != null && !collElementExprs.isEmpty()) {
            // Make sure the the collection element(s) are compatible with the elemExpr
            boolean incompatible = true;
            Class elemtype = clr.classForName(elemExpr.getJavaTypeMapping().getType());
            Iterator<SQLExpression> collElementExprIter = collElementExprs.iterator();
            while (collElementExprIter.hasNext()) {
                SQLExpression collElementExpr = collElementExprIter.next();
                Class collElemType = clr.classForName(collElementExpr.getJavaTypeMapping().getType());
                if (elementTypeCompatible(elemtype, collElemType)) {
                    incompatible = false;
                    break;
                }
            }
            if (incompatible) {
                // The provided element type isn't assignable to any of the input collection elements!
                return exprFactory.newLiteral(stmt, m, true).eq(exprFactory.newLiteral(stmt, m, false));
            }
            // Check if we should compare using an "IN (...)" expression
            SQLExpression collElementExpr = collElementExprs.get(0);
            if (collElementExpr instanceof StringExpression || collElementExpr instanceof NumericExpression || collElementExpr instanceof TemporalExpression || collElementExpr instanceof CharacterExpression || collElementExpr instanceof EnumExpression) {
                useInExpression = true;
            }
        }
        if (useInExpression) {
            // Return "elem IN (val1, val2, ...)"
            SQLExpression[] exprs = (collElementExprs != null ? collElementExprs.toArray(new SQLExpression[collElementExprs.size()]) : null);
            return new InExpression(elemExpr, exprs);
        }
        // TODO If elemExpr is a parameter and collExpr is derived from a parameter ?
        BooleanExpression bExpr = null;
        List<SQLExpression> elementExprs = lit.getElementExpressions();
        for (int i = 0; i < elementExprs.size(); i++) {
            SQLExpression arrElemExpr = elementExprs.get(i);
            if (bExpr == null) {
                bExpr = arrElemExpr.eq(elemExpr);
            } else {
                bExpr = bExpr.ior(arrElemExpr.eq(elemExpr));
            }
        }
        if (bExpr != null) {
            bExpr.encloseInParentheses();
        }
        return bExpr;
    } else if (arrExpr.getElementExpressions() != null) {
        if (elemExpr instanceof UnboundExpression) {
            Class elemCls = clr.classForName(arrExpr.getJavaTypeMapping().getType()).getComponentType();
            elemExpr = stmt.getQueryGenerator().bindVariable((UnboundExpression) elemExpr, elemCls);
        }
        // Array defined in query that has some expressions for elements, so just do OR chain
        BooleanExpression bExpr = null;
        List<SQLExpression> elementExprs = arrExpr.getElementExpressions();
        for (int i = 0; i < elementExprs.size(); i++) {
            SQLExpression arrElemExpr = elementExprs.get(i);
            if (bExpr == null) {
                bExpr = arrElemExpr.eq(elemExpr);
            } else {
                bExpr = bExpr.ior(arrElemExpr.eq(elemExpr));
            }
        }
        if (bExpr != null) {
            bExpr.encloseInParentheses();
        }
        return bExpr;
    } else {
        // TODO Support inner join variant
        return containsAsSubquery(stmt, arrExpr, elemExpr);
    }
}