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

org.apache.openjpa.kernel.exps.Context
JPQL / Criteria Query Context @since 2.0

        if (lctx.cloneFrom == cloneFrom)
            return lctx;
        java.util.List<Context> subselCtxs = lctx.getSubselContexts();
        if (subselCtxs != null) {
            for (Context subselCtx : subselCtxs) {
                Context ctx = getThreadLocalContext(subselCtx, cloneFrom);
                if (ctx != null)
                    return ctx;
            }
        }
        return null;

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     */
    public JPQLExpressionBuilder(ExpressionFactory factory,
        ExpressionStoreQuery query, Object parsedQuery) {
        super(factory, query.getResolver());


        contexts.push(new Context(parsedQuery instanceof ParsedJPQL
            ? (ParsedJPQL) parsedQuery
            : parsedQuery instanceof String
            ? getParsedQuery((String) parsedQuery)
            : null, null, null));

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        if (candidate == null && fmd.isElementCollection())
            candidate = fmd.getDefiningMetaData();


        setCandidate(candidate, alias);


        Context subContext = ctx();
        Subquery subquery = ctx().getSubquery();
        if (subquery == null){
            subquery = factory.newSubquery(candidate, true, alias);
            subContext.setSubquery(subquery);
        }
        else {
            subquery.setSubqAlias(alias);
        }

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    protected Value getDefinedVariable(String id) {
        return ctx().getVariable(id);
    }


    protected boolean isSeenVariable(String var) {
        Context c = ctx().findContext(var);
        if (c != null)
            return true;
        return false;
    }

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    private Value getSubquery(JPQLNode node) {
        final boolean subclasses = true;


        // parse the subquery
        ParsedJPQL parsed = new ParsedJPQL(node.parser.jpql, node);
        Context subContext = new Context(parsed, null, ctx());
        contexts.push(subContext);


        ClassMetaData candidate = getCandidateMetaData(node);
        Subquery subq = subContext.getSubquery();
        if (subq == null) {
            subq = factory.newSubquery(candidate, subclasses, nextAlias());
            subContext.setSubquery(subq);
        }
        subq.setMetaData(candidate);
        
        // evaluate from clause for resolving variables defined in subquery
        JPQLNode from = node.getChild(1);

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        return ctx().parsed.root;
    }


    private ClassMetaData getMetaDataForAlias(String alias) {
        for (int i = contexts.size() - 1; i >= 0; i--) {
            Context context =  contexts.get(i);
            if (alias.equalsIgnoreCase(context.schemaAlias))
                return context.meta;
        }


        return null;

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    protected void addVariableToContext(String id, Value var) {
        ctx().addVariable(id, var);
    }


    protected Value getVariable(String var) {
        Context c = ctx();
        Value v = c.getVariable(var);
        if (v != null)
            return v;
        if (c.getParent() != null)
            return c.getParent().findVariable(var);


        return null;
    }

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     * Populate a kernel expression tree by translating the components of this
     * receiver with the help of the given {@link ExpressionFactory}.
     */
    QueryExpressions getQueryExpressions(ExpressionFactory factory) {
        _contexts = new Stack<Context>();
        Context context = new Context(null, null, null);
        _contexts.push(context);
        return new CriteriaExpressionBuilder().getQueryExpressions(factory, this);
    }

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                if (action.op == Action.GET_XPATH)
                    break;
            }
            prevaction = action;
            if (prevaction != null && prevaction.context != null) {
                Context jCtx = JDBCStoreQuery.getThreadLocalContext(prevaction.context);
                pstate.joins = pstate.joins.setJoinContext(jCtx);
            }
        }
        if (_varName != null)
            pstate.joins = pstate.joins.setVariable(_varName);

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    private String findSubqAlias(Select sel) {
        Select pSel = sel.getParent();
        if (pSel == null)
            return null;
        Context pCtx = pSel.ctx();
        if (pCtx.subquery == null)
            return null;
        if (pCtx.getSchema(_schemaAlias) != null)
            return ((SubQ)pCtx.subquery).getCandidateAlias();
        return findSubqAlias(pSel);
    }

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

org.apache.openjpa.jdbc.kernel.exps.PCPath

org.apache.openjpa.jdbc.kernel.exps.SelectConstructor

org.apache.openjpa.jdbc.kernel.JDBCStoreQuery

org.apache.openjpa.jdbc.sql.SelectImpl

org.apache.openjpa.jdbc.sql.SelectImpl$SelectJoins

org.apache.openjpa.kernel.jpql.JPQLExpressionBuilder

org.apache.openjpa.persistence.criteria.CriteriaQueryImpl

org.apache.openjpa.persistence.criteria.RootImpl

org.apache.openjpa.persistence.criteria.SubqueryImpl

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