Service.java example

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fcrepo4-master
/*
 * Licensed to DuraSpace under one or more contributor license agreements.
 * See the NOTICE file distributed with this work for additional information
 * regarding copyright ownership.
 *
 * DuraSpace 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 org.fcrepo.kernel.api.services;

import org.fcrepo.kernel.api.FedoraSession;

/**
 * @author bbpennel
 * @author barmintor
 * @since Feb 21, 2014
 */
public interface Service<T> {
    /**
     * Test whether T exists at the given path in the
     * repository
     *
     * @param path the path
     * @param session the session
     * @return whether T exists at the given path
     */
    public boolean exists(final FedoraSession session, final String path);
    /**
     * Retrieve an existing T instance by session and path
     *
     * @param path the path to the node
     * @param session the session
     * @return retrieved T
     */
    public T find(final FedoraSession session, final String path);
    /**
     * Retrieve a T instance by session and path
     *
     * @param session the session
     * @param path the path to the node
     * @return retrieved T
     */
    public T findOrCreate(final FedoraSession session, final String path);
}