Examples with ClassDescriptor org.apache.cayenne.reflect.ClassDescriptor used on opensource projects

Example 36 with ClassDescriptor

use of org.apache.cayenne.reflect.ClassDescriptor in project cayenne by apache.

the class EJBQLIdentifierColumnsTranslator method visitIdentifier.

@Override
public boolean visitIdentifier(EJBQLExpression expression) {
    Map<String, String> xfields = null;
    if (context.isAppendingResultColumns()) {
        xfields = context.nextEntityResult().getFields();
    }
    // assign whatever we have to a final ivar so that it can be accessed
    // within
    // the inner class
    final Map<String, String> fields = xfields;
    final String idVar = expression.getText();
    // append all table columns ... the trick is to follow the algorithm for
    // describing the fields in the expression compiler, so that we could
    // assign
    // columns labels from FieldResults in the order we encounter them
    // here...
    // TODO: andrus 2008/02/17 - this is a bit of a hack, think of a better
    // solution
    ClassDescriptor descriptor = context.getEntityDescriptor(idVar);
    PropertyVisitor visitor = new PropertyVisitor() {

        public boolean visitAttribute(AttributeProperty property) {
            ObjAttribute oa = property.getAttribute();
            Iterator<?> dbPathIterator = oa.getDbPathIterator();
            EJBQLJoinAppender joinAppender = null;
            String marker = null;
            EJBQLTableId lhsId = new EJBQLTableId(idVar);
            while (dbPathIterator.hasNext()) {
                Object pathPart = dbPathIterator.next();
                if (pathPart == null) {
                    throw new CayenneRuntimeException("ObjAttribute has no component: %s", oa.getName());
                } else if (pathPart instanceof DbRelationship) {
                    if (marker == null) {
                        marker = EJBQLJoinAppender.makeJoinTailMarker(idVar);
                        joinAppender = context.getTranslatorFactory().getJoinAppender(context);
                    }
                    DbRelationship dr = (DbRelationship) pathPart;
                    EJBQLTableId rhsId = new EJBQLTableId(lhsId, dr.getName());
                    joinAppender.appendOuterJoin(marker, lhsId, rhsId);
                    lhsId = rhsId;
                } else if (pathPart instanceof DbAttribute) {
                    appendColumn(idVar, oa, (DbAttribute) pathPart, fields, oa.getType());
                }
            }
            return true;
        }

        public boolean visitToMany(ToManyProperty property) {
            visitRelationship(property);
            return true;
        }

        public boolean visitToOne(ToOneProperty property) {
            visitRelationship(property);
            return true;
        }

        private void visitRelationship(ArcProperty property) {
            ObjRelationship rel = property.getRelationship();
            DbRelationship dbRel = rel.getDbRelationships().get(0);
            for (DbJoin join : dbRel.getJoins()) {
                DbAttribute src = join.getSource();
                appendColumn(idVar, null, src, fields);
            }
        }
    };
    // EJBQL queries are polymorphic by definition - there is no distinction
    // between
    // inheritance/no-inheritance fetch
    descriptor.visitAllProperties(visitor);
    // append id columns ... (some may have been appended already via
    // relationships)
    DbEntity table = descriptor.getEntity().getDbEntity();
    for (DbAttribute pk : table.getPrimaryKeys()) {
        appendColumn(idVar, null, pk, fields);
    }
    // append inheritance discriminator columns...
    for (ObjAttribute column : descriptor.getDiscriminatorColumns()) {
        appendColumn(idVar, column, column.getDbAttribute(), fields);
    }
    addPrefetchedColumnsIfAny(idVar);
    return false;
}

Example 37 with ClassDescriptor

use of org.apache.cayenne.reflect.ClassDescriptor in project cayenne by apache.

the class EJBQLIdentifierColumnsTranslator method addPrefetchedColumnsIfAny.

private void addPrefetchedColumnsIfAny(final String visitedIdentifier) {
    PrefetchTreeNode prefetchTree = context.getCompiledExpression().getPrefetchTree();
    if (prefetchTree != null) {
        for (PrefetchTreeNode prefetch : prefetchTree.adjacentJointNodes()) {
            ClassDescriptor descriptor = context.getEntityDescriptor(prefetch.getEjbqlPathEntityId());
            if (visitedIdentifier.equals(prefetch.getEjbqlPathEntityId())) {
                DbEntity table = descriptor.getRootDbEntities().iterator().next();
                ObjEntity objectEntity = descriptor.getEntity();
                prefetch.setEntityName(objectEntity.getName());
                Expression prefetchExp = ExpressionFactory.exp(prefetch.getPath());
                Expression dbPrefetch = objectEntity.translateToDbPath(prefetchExp);
                DbRelationship r = null;
                for (PathComponent<DbAttribute, DbRelationship> component : table.resolvePath(dbPrefetch, context.getMetadata().getPathSplitAliases())) {
                    r = component.getRelationship();
                }
                if (r == null) {
                    throw new CayenneRuntimeException("Invalid joint prefetch '%s' for entity: %s", prefetch, objectEntity.getName());
                }
                for (DbAttribute attribute : r.getTargetEntity().getAttributes()) {
                    appendColumn(prefetch.getEjbqlPathEntityId() + "." + prefetch.getPath(), attribute, "", prefetch.getPath() + "." + attribute.getName(), null);
                }
            }
        }
    }
}

Example 38 with ClassDescriptor

use of org.apache.cayenne.reflect.ClassDescriptor in project cayenne by apache.

the class EJBQLDbPathTranslator method visitIdentifier.

@Override
public boolean visitIdentifier(EJBQLExpression expression) {
    // expression id is always rooted in an ObjEntity, even for DbPath...
    ClassDescriptor descriptor = context.getEntityDescriptor(expression.getText());
    if (descriptor == null) {
        throw new EJBQLException("Invalid identification variable: " + expression.getText());
    }
    this.currentEntity = descriptor.getEntity().getDbEntity();
    this.idPath = expression.getText();
    this.joinMarker = EJBQLJoinAppender.makeJoinTailMarker(idPath);
    this.fullPath = idPath;
    return true;
}

Example 39 with ClassDescriptor

use of org.apache.cayenne.reflect.ClassDescriptor in project cayenne by apache.

the class EJBQLIdColumnsTranslator method visitIdentifier.

@Override
public boolean visitIdentifier(EJBQLExpression expression) {
    Map<String, String> fields = null;
    if (context.isAppendingResultColumns()) {
        fields = context.nextEntityResult().getFields();
    }
    String idVar = expression.getText();
    ClassDescriptor descriptor = context.getEntityDescriptor(idVar);
    ObjEntity oe = descriptor.getEntity();
    for (ObjAttribute oa : oe.getPrimaryKeys()) {
        DbAttribute t = oe.getDbEntity().getAttribute(oa.getDbAttributeName());
        appendColumn(idVar, oa, t, fields, oa.getType());
    }
    return false;
}

Example 40 with ClassDescriptor

use of org.apache.cayenne.reflect.ClassDescriptor in project cayenne by apache.

the class EJBQLTableId method getDbEntity.

/**
 * Returns a DbEntity corresponding to the ID, that could be a root entity for the id,
 * or a joined entity.
 */
DbEntity getDbEntity(EJBQLTranslationContext context) {
    ClassDescriptor descriptor = context.getEntityDescriptor(entityId);
    DbEntity rootEntity = descriptor.getEntity().getDbEntity();
    if (dbPath == null) {
        return rootEntity;
    }
    DbRelationship r = null;
    Iterator<?> it = rootEntity.resolvePathComponents(dbPath);
    while (it.hasNext()) {
        r = (DbRelationship) it.next();
    }
    return (DbEntity) r.getTargetEntity();
}