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/**
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package com.agfa.hap.sdo;
import java.io.Serializable;
import java.util.List;
/**
* Collection of structured data at a given moment in time.
* You can think of this as a set of name-value pairs
* where the names correspond to various {@link Property} instances.
* The actual content (i.e. which properties are contained) has been defined based on
* a {@link SnapshotDefinition}.
* <br />
* The difference with a DataGraph is that a Snapshot contains the state of a
* set of dataobjects at a certain moment in time. As such it is immutable.
* Another difference is that is defines its content based on a definition as opposed
* to the datagraph that uses the containment relation
* defined by sdo ({@see {@link Property#isContainment()}).
* <br />
* The data can be extracted either as a set of {@link ProxyDataObject} instances.
* The data can also be returned as a set of objects (POJOs). The latter case assumes
* appropriate classes can be
* found that correspond to the different {@link Type}s that are used.
* <br />
* <strong>Warning:</strong>
* Serialized objects of this class will not be compatible with
* future hap.SDO releases. The current serialization support is
* appropriate for short term storage or RMI between applications running
* the same version of hap.sdo.
*
* @author AMOCZ
* @see DataAccessService
* @see DataMapper
*/
public interface Snapshot extends Serializable {
/**
* Extracts the objects from the snapshots
* @param factory
* @return A list containing new objects with appropriate properties filled in.
*/
<T> List<T> extract(DataMapper<T> mapper);
}
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