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

Example 11 with ClassDescriptor

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

the class DataContext method registerNewObject.

/**
 * Registers a transient object with the context, recursively registering
 * all transient persistent objects attached to this object via
 * relationships.
 * <p>
 * <i>Note that since 3.0 this method takes Object as an argument instead of
 * a {@link DataObject}.</i>
 *
 * @param object
 *            new object that needs to be made persistent.
 */
@Override
public void registerNewObject(Object object) {
    if (object == null) {
        throw new NullPointerException("Can't register null object.");
    }
    ObjEntity entity = getEntityResolver().getObjEntity((Persistent) object);
    if (entity == null) {
        throw new IllegalArgumentException("Can't find ObjEntity for Persistent class: " + object.getClass().getName() + ", class is likely not mapped.");
    }
    final Persistent persistent = (Persistent) object;
    // sanity check - maybe already registered
    if (persistent.getObjectId() != null) {
        if (persistent.getObjectContext() == this) {
            // already registered, just ignore
            return;
        } else if (persistent.getObjectContext() != null) {
            throw new IllegalStateException("Persistent is already registered with another DataContext. " + "Try using 'localObjects()' instead.");
        }
    } else {
        persistent.setObjectId(ObjectId.of(entity.getName()));
    }
    ClassDescriptor descriptor = getEntityResolver().getClassDescriptor(entity.getName());
    if (descriptor == null) {
        throw new IllegalArgumentException("Invalid entity name: " + entity.getName());
    }
    injectInitialValue(object);
    // now we need to find all arc changes, inject missing value holders and
    // pull in
    // all transient connected objects
    descriptor.visitProperties(new PropertyVisitor() {

        public boolean visitToMany(ToManyProperty property) {
            property.injectValueHolder(persistent);
            if (!property.isFault(persistent)) {
                Object value = property.readProperty(persistent);
                @SuppressWarnings("unchecked") Collection<Map.Entry> collection = (value instanceof Map) ? ((Map) value).entrySet() : (Collection) value;
                for (Object target : collection) {
                    if (target instanceof Persistent) {
                        Persistent targetDO = (Persistent) target;
                        // make sure it is registered
                        registerNewObject(targetDO);
                        getObjectStore().arcCreated(persistent.getObjectId(), targetDO.getObjectId(), new ArcId(property));
                    }
                }
            }
            return true;
        }

        public boolean visitToOne(ToOneProperty property) {
            Object target = property.readPropertyDirectly(persistent);
            if (target instanceof Persistent) {
                Persistent targetDO = (Persistent) target;
                // make sure it is registered
                registerNewObject(targetDO);
                getObjectStore().arcCreated(persistent.getObjectId(), targetDO.getObjectId(), new ArcId(property));
            }
            return true;
        }

        public boolean visitAttribute(AttributeProperty property) {
            return true;
        }
    });
}

Example 12 with ClassDescriptor

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

the class BaseContext method prepareForAccess.

@Override
public void prepareForAccess(Persistent object, String property, boolean lazyFaulting) {
    if (object.getPersistenceState() == PersistenceState.HOLLOW) {
        ObjectId oid = object.getObjectId();
        List<?> objects = performQuery(new ObjectIdQuery(oid, false, ObjectIdQuery.CACHE));
        if (objects.size() == 0) {
            throw new FaultFailureException("Error resolving fault, no matching row exists in the database for ObjectId: " + oid);
        } else if (objects.size() > 1) {
            throw new FaultFailureException("Error resolving fault, more than one row exists in the database for ObjectId: " + oid);
        }
    // 5/28/2013 - Commented out this block to allow for modifying
    // objects in the postLoad callback
    // sanity check...
    // if (object.getPersistenceState() != PersistenceState.COMMITTED) {
    // 
    // String state =
    // PersistenceState.persistenceStateName(object.getPersistenceState());
    // 
    // // TODO: andrus 4/13/2006, modified and deleted states are
    // // possible due to
    // // a race condition, should we handle them here?
    // throw new
    // FaultFailureException("Error resolving fault for ObjectId: " +
    // oid + " and state (" + state
    // +
    // "). Possible cause - matching row is missing from the database.");
    // }
    }
    // resolve relationship fault
    if (lazyFaulting && property != null) {
        ClassDescriptor classDescriptor = getEntityResolver().getClassDescriptor(object.getObjectId().getEntityName());
        PropertyDescriptor propertyDescriptor = classDescriptor.getProperty(property);
        // be used.
        if (propertyDescriptor == null) {
            final StringBuilder errorMessage = new StringBuilder();
            errorMessage.append(String.format("Property '%s' is not declared for entity '%s'.", property, object.getObjectId().getEntityName()));
            errorMessage.append(" Declared properties are: ");
            // Grab each of the declared properties.
            final List<String> properties = new ArrayList<>();
            classDescriptor.visitProperties(new PropertyVisitor() {

                @Override
                public boolean visitAttribute(final AttributeProperty property) {
                    properties.add(property.getName());
                    return true;
                }

                @Override
                public boolean visitToOne(final ToOneProperty property) {
                    properties.add(property.getName());
                    return true;
                }

                @Override
                public boolean visitToMany(final ToManyProperty property) {
                    properties.add(property.getName());
                    return true;
                }
            });
            // Now add the declared property names to the error message.
            boolean first = true;
            for (String declaredProperty : properties) {
                if (first) {
                    errorMessage.append(String.format("'%s'", declaredProperty));
                    first = false;
                } else {
                    errorMessage.append(String.format(", '%s'", declaredProperty));
                }
            }
            errorMessage.append(".");
            throw new CayenneRuntimeException(errorMessage.toString());
        }
        // this should trigger fault resolving
        propertyDescriptor.readProperty(object);
    }
}

Example 13 with ClassDescriptor

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

the class BaseContext method localObject.

/**
 * @since 3.1
 */
@Override
public <T extends Persistent> T localObject(T objectFromAnotherContext) {
    if (objectFromAnotherContext == null) {
        throw new NullPointerException("Null object argument");
    }
    ObjectId id = objectFromAnotherContext.getObjectId();
    // first look for the ID in the local GraphManager
    synchronized (getGraphManager()) {
        @SuppressWarnings("unchecked") T localObject = (T) getGraphManager().getNode(id);
        if (localObject != null) {
            return localObject;
        }
        // create a hollow object, optimistically assuming that the ID we got from
        // 'objectFromAnotherContext' is a valid ID either in the parent context or in the DB.
        // This essentially defers possible FaultFailureExceptions.
        ClassDescriptor descriptor = getEntityResolver().getClassDescriptor(id.getEntityName());
        @SuppressWarnings("unchecked") T persistent = (T) descriptor.createObject();
        persistent.setObjectContext(this);
        persistent.setObjectId(id);
        persistent.setPersistenceState(PersistenceState.HOLLOW);
        getGraphManager().registerNode(id, persistent);
        return persistent;
    }
}

Example 14 with ClassDescriptor

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

the class PrefetchNodeStage method processJoint.

private void processJoint(TranslatorContext context) {
    QueryMetadata queryMetadata = context.getMetadata();
    PrefetchTreeNode prefetch = queryMetadata.getPrefetchTree();
    if (prefetch == null) {
        return;
    }
    ObjEntity objEntity = queryMetadata.getObjEntity();
    boolean warnPrefetchWithLimit = false;
    for (PrefetchTreeNode node : prefetch.adjacentJointNodes()) {
        Expression prefetchExp = ExpressionFactory.exp(node.getPath());
        ASTDbPath dbPrefetch = (ASTDbPath) objEntity.translateToDbPath(prefetchExp);
        final String dbPath = dbPrefetch.getPath();
        DbEntity dbEntity = objEntity.getDbEntity();
        PathComponents components = new PathComponents(dbPath);
        StringBuilder fullPath = new StringBuilder();
        for (String c : components.getAll()) {
            DbRelationship rel = dbEntity.getRelationship(c);
            if (rel == null) {
                throw new CayenneRuntimeException("Unable to resolve path %s for entity %s", dbPath, objEntity.getName());
            }
            if (fullPath.length() > 0) {
                fullPath.append('.');
            }
            context.getTableTree().addJoinTable("p:" + fullPath.append(c).toString(), rel, JoinType.LEFT_OUTER);
            dbEntity = rel.getTargetEntity();
        }
        ObjRelationship targetRel = (ObjRelationship) prefetchExp.evaluate(objEntity);
        ClassDescriptor prefetchClassDescriptor = context.getResolver().getClassDescriptor(targetRel.getTargetEntityName());
        DescriptorColumnExtractor columnExtractor = new DescriptorColumnExtractor(context, prefetchClassDescriptor);
        columnExtractor.extract("p:" + dbPath);
        if (!warnPrefetchWithLimit && targetRel.isToMany() && (queryMetadata.getFetchLimit() > 0 || queryMetadata.getFetchOffset() > 0)) {
            warnPrefetchWithLimit = true;
        }
    }
    // warn about a potentially faulty joint prefetch + limit combination
    if (warnPrefetchWithLimit) {
        LOGGER.warn("The query uses both limit/offset and a joint prefetch, this most probably will lead to an incorrect result. " + "Either use disjointById prefetch or get a full result set.");
    }
}

Example 15 with ClassDescriptor

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

the class QualifierTranslationStage method perform.

@Override
public void perform(TranslatorContext context) {
    QualifierTranslator translator = context.getQualifierTranslator();
    Expression expression = context.getQuery().getQualifier();
    // Attaching Obj entity's qualifier
    ObjEntity entity = context.getMetadata().getObjEntity();
    if (entity != null) {
        ClassDescriptor descriptor = context.getMetadata().getClassDescriptor();
        Expression entityQualifier = descriptor.getEntityInheritanceTree().qualifierForEntityAndSubclasses();
        if (entityQualifier != null) {
            expression = expression == null ? entityQualifier : expression.andExp(entityQualifier);
        }
    }
    Node qualifierNode = translator.translate(expression);
    context.setQualifierNode(qualifierNode);
}