/*
 * Copyright (c) 2010-2012 Grid Dynamics Consulting Services, Inc, All Rights Reserved
 * http://www.griddynamics.com
 *
 * This library is free software; you can redistribute it and/or modify it under the terms of
 * the Apache License; either
 * version 2.0 of the License, or any later version.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package com.griddynamics.jagger.coordinator;

import java.io.Serializable;

import static com.google.common.base.Preconditions.checkNotNull;

/**
 * Qualifies the commands that can be executed by {@link CommandExecutor}.
 *
 * @author Mairbek Khadikov
 */
public class Qualifier<C extends Command> implements Serializable {
    private final Class<C> clazz;

    public static <C extends Command<R>, R extends Serializable> Qualifier<C> of(C command) {
        return new Qualifier<C>((Class<C>) command.getClass());
    }

    public static <C extends Command<R>, R extends Serializable> Qualifier<C> of(Class<C> clazz) {
        return new Qualifier<C>(clazz);
    }

    public Qualifier(Class<C> clazz) {
        this.clazz = checkNotNull(clazz);
    }

    public Class<C> getClazz() {
        return this.clazz;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        Qualifier qualifier = (Qualifier) o;
        return this.clazz.equals(qualifier.clazz);
    }

    @Override
    public int hashCode() {
        return this.clazz.hashCode();
    }

    @Override
    public String toString() {
        return "Qualifier{" +
                "clazz=" + this.clazz.getName() +
                '}';
    }
}