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

Example 1 with MapKeyLiteral

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

the class MapContainsKeyMethod 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() == 0 || args.size() > 1) {
        throw new NucleusException(Localiser.msg("060016", "containsKey", "MapExpression", 1));
    }
    MapExpression mapExpr = (MapExpression) expr;
    SQLExpression keyExpr = args.get(0);
    if (keyExpr.isParameter()) {
        // Key is a parameter so make sure its type is set
        AbstractMemberMetaData mmd = mapExpr.getJavaTypeMapping().getMemberMetaData();
        if (mmd != null && mmd.getMap() != null) {
            Class keyCls = stmt.getQueryGenerator().getClassLoaderResolver().classForName(mmd.getMap().getKeyType());
            stmt.getQueryGenerator().bindParameter(keyExpr.getParameterName(), keyCls);
        }
    }
    SQLExpressionFactory exprFactory = stmt.getSQLExpressionFactory();
    ClassLoaderResolver clr = stmt.getQueryGenerator().getClassLoaderResolver();
    if (expr instanceof MapLiteral) {
        // Literal Map
        MapLiteral lit = (MapLiteral) expr;
        Map map = (Map) lit.getValue();
        JavaTypeMapping m = exprFactory.getMappingForType(boolean.class, true);
        if (map == null || map.size() == 0) {
            return exprFactory.newLiteral(stmt, m, true).eq(exprFactory.newLiteral(stmt, m, false));
        }
        boolean useInExpression = false;
        List<SQLExpression> mapKeyExprs = lit.getKeyLiteral().getKeyExpressions();
        if (mapKeyExprs != null && !mapKeyExprs.isEmpty()) {
            // Make sure the the map key(s) are compatible with the keyExpr
            boolean incompatible = true;
            Class elemtype = clr.classForName(keyExpr.getJavaTypeMapping().getType());
            Iterator<SQLExpression> mapKeyExprIter = mapKeyExprs.iterator();
            while (mapKeyExprIter.hasNext()) {
                SQLExpression mapKeyExpr = mapKeyExprIter.next();
                Class mapKeyType = clr.classForName(mapKeyExpr.getJavaTypeMapping().getType());
                if (keyTypeCompatible(elemtype, mapKeyType)) {
                    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 mapKeyExpr = mapKeyExprs.get(0);
            if (mapKeyExpr instanceof StringExpression || mapKeyExpr instanceof NumericExpression || mapKeyExpr instanceof TemporalExpression || mapKeyExpr instanceof CharacterExpression || mapKeyExpr instanceof EnumExpression) {
                useInExpression = true;
            }
        }
        if (useInExpression) {
            // Return "key IN (val1, val2, ...)"
            SQLExpression[] exprs = (mapKeyExprs != null ? mapKeyExprs.toArray(new SQLExpression[mapKeyExprs.size()]) : null);
            return new InExpression(keyExpr, exprs);
        }
        // TODO If keyExpr is a parameter and mapExpr is derived from a parameter ?
        MapKeyLiteral mapKeyLiteral = lit.getKeyLiteral();
        BooleanExpression bExpr = null;
        List<SQLExpression> elementExprs = mapKeyLiteral.getKeyExpressions();
        for (int i = 0; i < elementExprs.size(); i++) {
            if (bExpr == null) {
                bExpr = (elementExprs.get(i)).eq(keyExpr);
            } else {
                bExpr = bExpr.ior((elementExprs.get(i)).eq(keyExpr));
            }
        }
        if (bExpr != null) {
            bExpr.encloseInParentheses();
        }
        return bExpr;
    }
    if (stmt.getQueryGenerator().getCompilationComponent() == CompilationComponent.FILTER) {
        boolean useSubquery = getNeedsSubquery(stmt);
        JoinType joinType = JoinType.INNER_JOIN;
        if (keyExpr instanceof UnboundExpression) {
            // See if the user has defined what should be used
            String varName = ((UnboundExpression) keyExpr).getVariableName();
            String extensionName = "datanucleus.query.jdoql." + varName + ".join";
            String extensionValue = (String) stmt.getQueryGenerator().getValueForExtension(extensionName);
            if (extensionValue != null) {
                if (extensionValue.equalsIgnoreCase("SUBQUERY")) {
                    useSubquery = true;
                } else if (extensionValue.equalsIgnoreCase("INNERJOIN")) {
                    useSubquery = false;
                } else if (extensionValue.equalsIgnoreCase("LEFTOUTERJOIN")) {
                    joinType = JoinType.LEFT_OUTER_JOIN;
                }
            }
        }
        // TODO Check if *this* "containsKey" is negated, not any of them (and remove above check)
        if (useSubquery) {
            return containsAsSubquery(stmt, mapExpr, keyExpr);
        }
        return containsAsJoin(stmt, mapExpr, keyExpr, joinType);
    }
    return containsAsSubquery(stmt, mapExpr, keyExpr);
}