Examples of org.apache.openjpa.kernel.exps.Expression

org.apache.openjpa.kernel.exps.Expression
Interface for a set of conditions that must be met for the query to be true. @author Abe White

    QueryExpressions getQueryExpressions() {
        QueryExpressions exps = new QueryExpressions();


        evalQueryOperation(exps);


        Expression filter = null;
        filter = and(evalFromClause(root().id == JJTSELECT), filter);
        filter = and(evalWhereClause(exps), filter);
        filter = and(evalSelectClause(exps), filter);


        exps.filter = filter == null ? factory.emptyExpression() : filter;

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        int count = parametersNode.getChildCount();
        exps.projections = new Value[count];
        exps.projectionClauses = new String[count];
        exps.projectionAliases = new String[count];


        Expression exp = null;
        for (int i = 0; i < count; i++) {
            JPQLNode parent = parametersNode.getChild(i);
            JPQLNode node = onlyChild(parent);
            Value proj = getValue(node);
            exps.projections[i] = proj;

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        return alias;
    }


    protected Expression evalFetchJoins(QueryExpressions exps) {
        Expression filter = null;


        // handle JOIN FETCH
        Set joins = null;


        JPQLNode[] outers = root().findChildrenByID(JJTOUTERFETCHJOIN);

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            return null;
        return (Expression) eval(whereNode);
    }


    private Expression evalFromClause(boolean needsAlias) {
        Expression exp = null;


        // build up the alias map in the FROM clause
        JPQLNode from = root().findChildByID(JJTFROM, false);
        if (from == null)
            throw parseException(EX_USER, "no-from-clause", null, null);

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        String alias = aliasNode != null ? aliasNode.text : nextAlias();


        Value var = getVariable(alias, true);
        var.setMetaData(getFieldType(fmd));


        Expression join = null;


        // if the variable is already bound, get the var's value and
        // do a regular contains with that
        boolean bound = isBound(var);
        if (bound) {

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                return evalNot(not, and(factory.greaterThanEqual(val1, val2),
                    factory.lessThanEqual(val1, val3)));


            case JJTIN: // x.field [NOT] IN ('a', 'b', 'c')


                Expression inExp = null;
                Iterator inIterator = node.iterator();
                // the first child is the path
                val1 = getValue((JPQLNode) inIterator.next());


                while (inIterator.hasNext()) {

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        QueryExpressions exps = new QueryExpressions();
        exps.setContexts(contexts);


        evalQueryOperation(exps);


        Expression filter = null;
        Expression from = ctx().from;
        if (from == null)
            from = evalFromClause(root().id == JJTSELECT);
        filter = and(from, filter);
        filter = and(evalWhereClause(), filter);
        filter = and(evalSelectClause(exps), filter);

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    private Expression assignProjections(JPQLNode parametersNode,
        QueryExpressions exps, List<Value> projections,
        List<String> projectionClauses, List<String> projectionAliases) {
        int count = parametersNode.getChildCount();


        Expression exp = null;
        for (int i = 0; i < count; i++) {
            JPQLNode parent = parametersNode.getChild(i);
            JPQLNode node = firstChild(parent);
            JPQLNode aliasNode = parent.children.length > 1 ? right(parent)
                : null;

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        return alias;
    }


    protected Expression evalFetchJoins(QueryExpressions exps) {
        Expression filter = null;


        // handle JOIN FETCH
        Set<String> joins = null;
        Set<String> innerJoins = null;

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            throw parseException(EX_USER, "no-from-clause", null, null);
        return evalFromClause(from, needsAlias);
    }


    private Expression evalFromClause(JPQLNode from, boolean needsAlias) {
        Expression exp = null;


        for (int i = 0; i < from.children.length; i++) {
            JPQLNode node = from.children[i];


            if (node.id == JJTFROMITEM)

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Related Classes of org.apache.openjpa.kernel.exps.Expression

org.apache.openjpa.kernel.jpql.JPQLExpressionBuilder

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