Examples with Persistent org.apache.cayenne.Persistent used on opensource projects

Example 41 with Persistent

use of org.apache.cayenne.Persistent in project cayenne by apache.

the class ObjectDetachOperation method detach.

/**
 * "Detaches" an object from its context by creating an unattached copy. The copy is
 * created using target descriptor of this operation that may be different from the
 * object descriptor passed to this method.
 */
public Object detach(Object object, ClassDescriptor descriptor, final PrefetchTreeNode prefetchTree) {
    if (!(object instanceof Persistent)) {
        throw new CayenneRuntimeException("Expected Persistent, got: %s", object);
    }
    final Persistent source = (Persistent) object;
    ObjectId id = source.getObjectId();
    // sanity check
    if (id == null) {
        throw new CayenneRuntimeException("Server returned an object without an id: %s", source);
    }
    Object seenTarget = seen.get(id);
    if (seenTarget != null) {
        return seenTarget;
    }
    descriptor = descriptor.getSubclassDescriptor(source.getClass());
    // presumably id's entity name should be of the right subclass.
    final ClassDescriptor targetDescriptor = targetResolver.getClassDescriptor(id.getEntityName());
    final Persistent target = (Persistent) targetDescriptor.createObject();
    target.setObjectId(id);
    seen.put(id, target);
    descriptor.visitProperties(new PropertyVisitor() {

        private void fillReverseRelationship(Object destinationTarget, ArcProperty property) {
            ArcProperty clientProperty = (ArcProperty) targetDescriptor.getProperty(property.getName());
            if (clientProperty != null) {
                ArcProperty clientReverse = clientProperty.getComplimentaryReverseArc();
                if (clientReverse instanceof ToOneProperty) {
                    clientReverse.writeProperty(destinationTarget, null, target);
                }
            }
        }

        public boolean visitToOne(ToOneProperty property) {
            if (prefetchTree != null) {
                PrefetchTreeNode child = prefetchTree.getNode(property.getName());
                if (child != null) {
                    Object destinationSource = property.readProperty(source);
                    Object destinationTarget = destinationSource != null ? detach(destinationSource, property.getTargetDescriptor(), child) : null;
                    if (destinationTarget != null) {
                        fillReverseRelationship(destinationTarget, property);
                    }
                    ToOneProperty targetProperty = (ToOneProperty) targetDescriptor.getProperty(property.getName());
                    Object oldTarget = targetProperty.isFault(target) ? null : targetProperty.readProperty(target);
                    targetProperty.writeProperty(target, oldTarget, destinationTarget);
                }
            }
            return true;
        }

        public boolean visitToMany(ToManyProperty property) {
            if (prefetchTree != null) {
                PrefetchTreeNode child = prefetchTree.getNode(property.getName());
                if (child != null) {
                    Object value = property.readProperty(source);
                    Object targetValue;
                    if (property instanceof ToManyMapProperty) {
                        Map<?, ?> map = (Map) value;
                        Map targetMap = new HashMap();
                        for (Entry entry : map.entrySet()) {
                            Object destinationSource = entry.getValue();
                            Object destinationTarget = destinationSource != null ? detach(destinationSource, property.getTargetDescriptor(), child) : null;
                            if (destinationTarget != null) {
                                fillReverseRelationship(destinationTarget, property);
                            }
                            targetMap.put(entry.getKey(), destinationTarget);
                        }
                        targetValue = targetMap;
                    } else {
                        Collection collection = (Collection) value;
                        Collection targetCollection = new ArrayList(collection.size());
                        for (Object destinationSource : collection) {
                            Object destinationTarget = destinationSource != null ? detach(destinationSource, property.getTargetDescriptor(), child) : null;
                            if (destinationTarget != null) {
                                fillReverseRelationship(destinationTarget, property);
                            }
                            targetCollection.add(destinationTarget);
                        }
                        targetValue = targetCollection;
                    }
                    ToManyProperty targetProperty = (ToManyProperty) targetDescriptor.getProperty(property.getName());
                    targetProperty.writeProperty(target, null, targetValue);
                }
            }
            return true;
        }

        public boolean visitAttribute(AttributeProperty property) {
            PropertyDescriptor targetProperty = targetDescriptor.getProperty(property.getName());
            targetProperty.writeProperty(target, null, property.readProperty(source));
            return true;
        }
    });
    return target;
}

Example 42 with Persistent

use of org.apache.cayenne.Persistent in project cayenne by apache.

the class SimpleNode method encodeScalarAsEJBQL.

/**
 * <p>
 * This is a utility method that can represent the supplied scalar as either
 * an EJBQL literal into the supplied {@link java.io.PrintWriter} or is able
 * to add the scalar to the parameters and to instead write a positional
 * parameter to the EJBQL written to the {@link java.io.PrintWriter}. If the
 * parameters are null and the scalar object is not able to be represented
 * as an EJBQL literal then the method will throw a runtime exception to
 * indicate that it has failed to produce valid EJBQL.
 * </p>
 */
protected static void encodeScalarAsEJBQL(List<Object> parameterAccumulator, Appendable out, Object scalar) throws IOException {
    if (null == scalar) {
        out.append("null");
        return;
    }
    if (scalar instanceof Boolean) {
        if ((Boolean) scalar) {
            out.append("true");
        } else {
            out.append("false");
        }
        return;
    }
    if (null != parameterAccumulator) {
        parameterAccumulator.add(scalar);
        out.append('?');
        // parameters start at 1
        out.append(Integer.toString(parameterAccumulator.size()));
        return;
    }
    if (scalar instanceof Integer || scalar instanceof Long || scalar instanceof Float || scalar instanceof Double) {
        out.append(scalar.toString());
        return;
    }
    if (scalar instanceof Persistent) {
        ObjectId id = ((Persistent) scalar).getObjectId();
        Object encode = (id != null) ? id : scalar;
        appendAsEscapedString(out, String.valueOf(encode));
        return;
    }
    if (scalar instanceof Enum<?>) {
        Enum<?> e = (Enum<?>) scalar;
        out.append("enum:");
        out.append(e.getClass().getName()).append(".").append(e.name());
        return;
    }
    if (scalar instanceof String) {
        out.append('\'');
        appendAsEscapedString(out, scalar.toString());
        out.append('\'');
        return;
    }
    throw new IllegalStateException("the scalar type '" + scalar.getClass().getSimpleName() + "' is not supported as a scalar type in EJBQL");
}

Example 43 with Persistent

use of org.apache.cayenne.Persistent in project cayenne by apache.

the class SimpleNode method appendScalarAsString.

/**
 * Utility method that encodes an object that is not an expression Node to
 * String.
 */
protected static void appendScalarAsString(Appendable out, Object scalar, char quoteChar) throws IOException {
    boolean quote = scalar instanceof String;
    if (quote) {
        out.append(quoteChar);
    }
    // TODO: should we use UUID here?
    if (scalar instanceof Persistent) {
        ObjectId id = ((Persistent) scalar).getObjectId();
        Object encode = (id != null) ? id : scalar;
        appendAsEscapedString(out, String.valueOf(encode));
    } else if (scalar instanceof Enum<?>) {
        Enum<?> e = (Enum<?>) scalar;
        out.append("enum:");
        out.append(e.getClass().getName()).append(".").append(e.name());
    } else {
        appendAsEscapedString(out, String.valueOf(scalar));
    }
    if (quote) {
        out.append(quoteChar);
    }
}

Example 44 with Persistent

use of org.apache.cayenne.Persistent in project cayenne by apache.

the class ChildDiffLoader method nodePropertyChanged.

public void nodePropertyChanged(Object nodeId, String property, Object oldValue, Object newValue) {
    // this change is for simple property, so no need to convert targets to
    // server
    // objects...
    Persistent object = findObject(nodeId);
    ClassDescriptor descriptor = context.getEntityResolver().getClassDescriptor(((ObjectId) nodeId).getEntityName());
    setExternalChange(Boolean.TRUE);
    try {
        descriptor.getProperty(property).writeProperty(object, oldValue, newValue);
    } catch (Exception e) {
        throw new CayenneRuntimeException("Error setting property: " + property, e);
    } finally {
        setExternalChange(Boolean.FALSE);
    }
}

Example 45 with Persistent

use of org.apache.cayenne.Persistent in project cayenne by apache.

the class ChildDiffLoader method arcDeleted.

public void arcDeleted(Object nodeId, final Object targetNodeId, Object arcId) {
    final Persistent source = findObject(nodeId);
    // changing their relationships
    if (source == null) {
        return;
    }
    ClassDescriptor descriptor = context.getEntityResolver().getClassDescriptor(((ObjectId) nodeId).getEntityName());
    PropertyDescriptor property = descriptor.getProperty(arcId.toString());
    setExternalChange(Boolean.TRUE);
    try {
        property.visit(new PropertyVisitor() {

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

            public boolean visitToMany(ToManyProperty property) {
                // connect reverse arc if the relationship is marked as
                // "runtime"
                ArcProperty reverseArc = property.getComplimentaryReverseArc();
                boolean autoConnectReverse = reverseArc != null && reverseArc.getRelationship().isRuntime();
                Persistent target = findObject(targetNodeId);
                if (target == null) {
                    // this is usually the case when a NEW object was
                    // deleted and then
                    // its
                    // relationships were manipulated; so try to locate the
                    // object in
                    // the
                    // collection ...
                    // the performance of this is rather dubious of
                    // course...
                    target = findObjectInCollection(targetNodeId, property.readProperty(source));
                }
                if (target == null) {
                // ignore?
                } else {
                    property.removeTarget(source, target, autoConnectReverse);
                }
                return false;
            }

            public boolean visitToOne(ToOneProperty property) {
                property.setTarget(source, null, false);
                return false;
            }
        });
    } finally {
        setExternalChange(Boolean.FALSE);
    }
}