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/**
 * Copyright 2012 Lyncode
 *
 * 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
 *
 *     client://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.lyncode.xoai.dataprovider.repository;

import com.lyncode.xoai.dataprovider.handlers.results.ListSetsResult;

/**
 * API for implementing a repository of sets.
 * It is possible to have a data provider without sets.
 *
 * @author Development @ Lyncode
 * @version 3.1.0
 */
public interface SetRepository {

    /**
     * Checks if the actual data source supports sets.
     *
     * @return Supports sets?
     */
    public boolean supportSets();

    /**
     * Returns a paged list of sets.
     * It is common to use a partial result of 100 sets however, in XOAI this is a configured parameter.
     *
     * @param offset Starting offset
     * @param length Max size of the returned list
     * @return List of Sets
     */
    public ListSetsResult retrieveSets(int offset, int length);

    /**
     * Checks if a specific sets exists in the data source.
     *
     * @param setSpec Set spec
     * @return Set exists
     * @see Set definition
     */
    public boolean exists(String setSpec);
}