/*
 * Copyright (c) 2008-2017, Hazelcast, Inc. All Rights Reserved.
 *
 * 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.hazelcast.config;

import static com.hazelcast.util.Preconditions.checkHasText;
import static com.hazelcast.util.Preconditions.checkNotNull;

/**
 * Contains the configuration for the {@link com.hazelcast.core.ILock}.
 */
public class LockConfig {

    private String name;
    private String quorumName;

    public LockConfig() {
    }

    /**
     * Creates a {@link LockConfig} with the provided name.
     *
     * @param name the name
     * @throws NullPointerException if name is null
     */
    public LockConfig(String name) {
        this.name = checkNotNull(name, "name can't be null");
    }

    /**
     * Clones a {@link LockConfig}
     *
     * @param config the lock config to clone
     * @throws NullPointerException if config is null
     */
    public LockConfig(LockConfig config) {
        checkNotNull(config, "config can't be null");
        this.name = config.name;
        this.quorumName = config.quorumName;
    }

    /**
     * Creates a new {@link LockConfig} by cloning an existing config and overriding the name.
     *
     * @param name   the new name
     * @param config the config.
     * @throws NullPointerException if name or config is null.
     */
    public LockConfig(String name, LockConfig config) {
        this(config);
        this.name = checkNotNull(name, "name can't be null");
    }

    /**
     * Sets the name of the lock.
     *
     * @param name the name of the lock
     * @return the updated {@link LockConfig}
     * @throws IllegalArgumentException if name is null or an empty string.
     */
    public LockConfig setName(String name) {
        this.name = checkHasText(name, "name must contain text");
        return this;
    }

    /**
     * Returns the name of the lock.
     *
     * @return the name of the lock.
     */
    public String getName() {
        return name;
    }

    /**
     * Returns the quorum name for lock operations.
     *
     * @return the quorum name
     */
    public String getQuorumName() {
        return quorumName;
    }

    /**
     * Sets the quorum name for lock operations.
     *
     * @param quorumName the quorum name
     * @return the updated lock configuration
     */
    public LockConfig setQuorumName(String quorumName) {
        this.quorumName = quorumName;
        return this;
    }

    /**
     * Gets immutable version of this configuration.
     *
     * @return Immutable version of this configuration.
     * @deprecated this method will be removed in 4.0; it is meant for internal usage only.
     */
    public LockConfig getAsReadOnly() {
        return new LockConfigReadonly(this);
    }

    @Override
    public String toString() {
        return "LockConfig{"
                + "name='" + name + '\''
                + ", quorumName='" + quorumName + '\''
                + '}';
    }

    /**
     * A readonly version of the {@link LockConfig}.
     */
    private static class LockConfigReadonly extends LockConfig {

        LockConfigReadonly(LockConfig config) {
            super(config);
        }

        @Override
        public LockConfig setName(String name) {
            throw new UnsupportedOperationException("This config is read-only");
        }

        @Override
        public LockConfig setQuorumName(String quorumName) {
            throw new UnsupportedOperationException("This config is read-only");
        }
    }
}