Examples of org.apache.openjpa.meta.ClassMetaData

org.apache.openjpa.meta.ClassMetaData
Contains metadata about a persistent type. This metadata is available both at enhancement time and runtime. Note that this class employs aggressive caching, and therefore it is important to finalize the configuration of field metadatas before invoking methods that depend on that configuration, such as {@link #getPrimaryKeyFields}. @author Abe White

    private StoreQuery.Executor createExecutor(boolean inMem) {
        assertCandidateType();


        MetaDataRepository repos = _broker.getConfiguration().
            getMetaDataRepositoryInstance();
        ClassMetaData meta = repos.getMetaData(_class,
            _broker.getClassLoader(), false);


        ClassMetaData[] metas;
        if (_class == null || _storeQuery.supportsAbstractExecutors())
            metas = new ClassMetaData[]{ meta };
        else if (_subclasses && (meta == null || meta.isManagedInterface()))
            metas = repos.getImplementorMetaDatas(_class,
                _broker.getClassLoader(), true);
        else if (meta != null && (_subclasses || meta.isMapped()))
            metas = new ClassMetaData[]{ meta };
        else
            metas = StoreQuery.EMPTY_METAS;


        if (metas.length == 0)

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        // first check the aliases map in the MetaDataRepository
        ClassLoader loader = (_class == null) ? _loader
            : (ClassLoader) AccessController.doPrivileged(
                J2DoPrivHelper.getClassLoaderAction(_class)); 
        ClassMetaData meta = _broker.getConfiguration().
            getMetaDataRepositoryInstance().getMetaData(name, loader, false);
        if (meta != null)
            return meta.getDescribedType();


        // try the name in the package of the candidate class
        if (_class != null) {
            String fullName = _class.getName().substring
                (0, _class.getName().lastIndexOf('.') + 1) + name;

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    }


    protected ClassMetaData resolveClassMetaData(JPQLNode node) {
        // handle looking up alias names
        String schemaName = assertSchemaName(node);
        ClassMetaData cmd = getClassMetaData(schemaName, false);
        if (cmd != null)
            return cmd;


        // we might be referencing a collection field of a subquery's parent
        if (isPath(node)) {

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        ClassLoader loader = getClassLoader();
        MetaDataRepository repos = resolver.getConfiguration().
            getMetaDataRepositoryInstance();


        // first check for the alias
        ClassMetaData cmd = repos.getMetaData(alias, loader, false);


        if (cmd != null)
            return cmd;


        // now check for the class name; this is not technically permitted

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    private ClassMetaData getCandidateMetaData() {
        if (ctx().meta != null)
            return ctx().meta;


        ClassMetaData cls = getCandidateMetaData(root());
        if (cls == null)
            throw parseException(EX_USER, "not-schema-name",
                new Object[]{ root() }, null);


        setCandidate(cls, null);

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            JPQLNode n = from.children[i];


            if (n.id == JJTABSTRACTSCHEMANAME) {
                // we simply return the first abstract schema child
                // as resolved into a class
                ClassMetaData cmd = resolveClassMetaData(n);


                if (cmd != null)
                    return cmd;


                // not a schema: treat it as a class
                String cls = assertSchemaName(n);
                if (cls == null)
                    throw parseException(EX_USER, "not-schema-name",
                        new Object[]{ root() }, null);


                return getClassMetaData(cls, true);
            }
            // OPENJPA-15 support subquery's from clause do not start with 
            // identification_variable_declaration()
            if (node.id == JJTSUBSELECT) {
                if (n.id == JJTINNERJOIN) {
                    n = n.getChild(0);
                }
                if (n.id == JJTPATH) {
                    Path path = getPath(n);
                    ClassMetaData cmd = getFieldType(path.last());
                    if (cmd != null) {
                        return cmd;
                    }
                    else {
                        throw parseException(EX_USER, "no-alias",

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        return and(exp, join);
    }


    private Expression evalFromItem(Expression exp, JPQLNode node,
        boolean needsAlias) {
        ClassMetaData cmd = resolveClassMetaData(firstChild(node));


        String alias = null;


        if (node.getChildCount() < 2) {
            if (needsAlias)

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    private static ClassMetaData getFieldType(FieldMetaData fmd) {
        if (fmd == null)
            return null;


        ClassMetaData cmd = null;
        ValueMetaData vmd;


        if ((vmd = fmd.getElement()) != null)
            cmd = vmd.getDeclaredTypeMetaData();
        else if ((vmd = fmd.getKey()) != null)
            cmd = vmd.getDeclaredTypeMetaData();
        else if ((vmd = fmd.getValue()) != null)
            cmd = vmd.getDeclaredTypeMetaData();


        if (cmd == null || cmd.getDescribedType() == Object.class)
            cmd = fmd.getDeclaredTypeMetaData();


        return cmd;
    }

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        String alias = nextAlias();


        // parse the subquery
        ParsedJPQL parsed = new ParsedJPQL(node.parser.jpql, node);


        ClassMetaData candidate = getCandidateMetaData(node);
        Subquery subq = factory.newSubquery(candidate, subclasses, alias);
        subq.setMetaData(candidate);


        contexts.push(new Context(parsed, subq));

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            parameterTypes = new LinkedMap(6);
        if (!parameterTypes.containsKey(id))
            parameterTypes.put(id, TYPE_OBJECT);


        Class type = Object.class;
        ClassMetaData meta = null;
        int index;


        if (positional) {
            try {
                // indexes in JPQL are 1-based, as opposed to 0-based in

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