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- /*
- * Copyright 2000-2014 Vaadin Ltd.
- *
- * Licensed 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.vaadin.tokka.server.communication.data;
-
- import java.io.Serializable;
-
- /**
- * DataKeyMapper to map data objects to key strings.
- *
- * @since
- * @param <T>
- * data type
- */
- public interface DataKeyMapper<T> extends Serializable {
-
- /**
- * Gets the key for data object. If no key exists beforehand, a new key is
- * created.
- *
- * @param dataObject
- * data object for key mapping
- * @return key for given data object
- */
- String key(T dataObject);
-
- /**
- * Gets the data object identified by given key.
- *
- * @param key
- * key of a data object
- * @return identified data object; <code>null</code> if invalid key
- */
- T get(String key);
-
- /**
- * Removes a data object from the key mapping. The key is also dropped.
- * Dropped keys are not reused.
- *
- * @param dataObject
- * dropped data object
- */
- void remove(T dataObject);
-
- /**
- * Removes all data objects from the key mapping. The keys are also dropped.
- * Dropped keys are not reused.
- */
- void removeAll();
- }
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