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/*
* Copyright (C) 2020 The Android Open Source Project
*
* 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.android.timezone.location.storage.table.reader;
/**
* A table containing entries with a signed, int key. A table can also have an array of shared data
* that can be used, for example, to hold information shared by all entries in the table.
*
* @param <E> The subtype of the {@link TableEntry} used for entries.
*/
public interface Table<E extends Table.TableEntry> {
/**
* Returns the table's unstructured shared data that can be used, for example, to hold
* information shared by all entries in the table.
*/
byte[] getSharedData();
/**
* Returns a table entry associated with the key, or {@code null} if there isn't one. If
* multiple entries have the key, then an arbitrary entry with the key is returned.
*/
E getEntry(int key);
/**
* Returns the entry with the specified index, index starts at zero. Throws
* {@link IndexOutOfBoundsException} if the index is invalid.
*/
E getEntryByIndex(int i);
/** Returns the number of entries in the table. */
int getEntryCount();
/**
* An entry in a {@link Table}.
*
* @param <T> the type of the entry
*/
interface TableEntry<T extends TableEntry<T>> {
/** Returns the entry's index in the table. */
int getIndex();
/** Returns the entry's key. */
int getKey();
/** Returns the previous entry, or {@code null} if there isn't one. */
T getPrevious();
/** Returns the next entry, or {@code null} if there isn't one. */
T getNext();
}
}
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