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

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

    
    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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        sel.setAutoDistinct((exps.distinct & exps.DISTINCT_AUTO) != 0);
        sel.setJoinSyntax(ctx.fetch.getJoinSyntax());
        sel.setParent(parent, alias);


        Context[] qryCtx = JDBCStoreQuery.getThreadLocalContext();
        Context lctx = null;
        for (int i = 0; i < qryCtx.length; i++) {
            if (qryCtx[i].cloneFrom == exps.ctx()) {
                lctx = qryCtx[i];
                break;
            }
        }


        if (sel.ctx() == null)
            sel.setContext(lctx);


        if (parent == null && lctx.getSubselContexts() != null) {
            // this is the case subselect was created before parent got created
            List<Context> subselCtxs = lctx.getSubselContexts();
            for (Context subselCtx : subselCtxs) {
                Select subsel = (Select) subselCtx.getSelect();
                Subquery subquery = subselCtx.getSubquery();
                subsel.setParent(sel, subquery.getCandidateAlias());
            }

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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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     */
    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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        String alias = _schemaAlias;
        if (isPathInThisContext(pj) || table.isAssociation())          
            alias = null;


        // find the context where this alias is defined
        Context ctx = (alias != null) ?
            _ctx.findContext(alias) : null;
        if (ctx != null)
            sel = (SelectImpl) ctx.getSelect();


        if (!create) 
            i = sel.findAlias(table, key);  // find in parent and in myself
        else
            i = sel.getAlias(table, key); // find in myself
        if (i != null)
            return i;
        
        if (create) { // create here
            i = sel.createAlias(table, key);
        } else if (ctx != null && ctx != ctx()) { // create in other select
            i = ((SelectImpl)ctx.getSelect()).createAlias(table, key);
        }


        return i;
    }

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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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