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

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

            int subs, boolean inverse, boolean toMany, boolean outer) {
            // don't let the get alias methods see that a var has been set
            // until we get past the local table
            String var = this.var;
            this.var = null;
            Context ctx = context; 
            context = null; 


            // get first table alias before updating path; if there is a from
            // select then we shouldn't actually create a join object, since
            // the joins will all be done in the from select

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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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        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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        return i;
    }


    private boolean isPathInThisContext(PathJoins pj) {
        // currCtx is set from Action, it is reset to null after the PCPath initialization
        Context currCtx = pj == null ? null : ((PathJoinsImpl)pj).context;
        
        // lastCtx is set to currCtx after the SelectJoins.join. pj.lastCtx and pj.path string are 
        // the last snapshot of pj. They will be used together for later table alias resolution in
        // the getColumnAlias(). 
        Context lastCtx = pj == null ? null : ((PathJoinsImpl)pj).lastContext;
        Context thisCtx = currCtx == null ? lastCtx : currCtx;
        String corrVar = pj == null ? null : pj.getCorrelatedVariable();
        
        return (pj != null && pj.path() != null && 
            (corrVar == null || (thisCtx != null && ctx() == thisCtx)));
    }

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            // don't let the get alias methods see that a var has been set
            // until we get past the local table
            String var = this.var;
            this.var = null;
            Context ctx = context; 
            context = null; 


            int alias1 = _sel.getTableIndex(localTable, this, true);
            this.append(var);
            this.append(correlatedVar);

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            int subs, boolean inverse, boolean toMany, boolean outer) {
            // don't let the get alias methods see that a var has been set
            // until we get past the local table
            String var = this.var;
            this.var = null;
            Context ctx = context; 
            context = null; 


            // get first table alias before updating path; if there is a from
            // select then we shouldn't actually create a join object, since
            // the joins will all be done in the from select

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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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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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