/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF 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.apache.tinkerpop.gremlin.tinkergraph.structure;

import org.apache.tinkerpop.gremlin.structure.Element;
import org.apache.tinkerpop.gremlin.structure.util.ElementHelper;

/**
 * @author Marko A. Rodriguez (http://markorodriguez.com)
 */
public abstract class TinkerElement implements Element {

    protected final Object id;
    protected final String label;
    protected boolean removed = false;
    protected long currentVersion;

    protected TinkerElement(final Object id, final String label) {
        this.id = id;
        this.label = label;
        currentVersion = -1;
    }

    protected TinkerElement(final Object id, final String label, final long currentVersion) {
        this.id = id;
        this.label = label;
        this.currentVersion = currentVersion;
    }

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

    public abstract  Object clone();

    @Override
    public Object id() {
        return this.id;
    }

    @Override
    public String label() {
        return this.label;
    }

    @SuppressWarnings("EqualsWhichDoesntCheckParameterClass")
    @Override
    public boolean equals(final Object object) {
        return ElementHelper.areEqual(this, object);
    }

    public long version() { return this.currentVersion; }

    protected static IllegalStateException elementAlreadyRemoved(final Class<? extends Element> clazz, final Object id) {
        return new IllegalStateException(String.format("%s with id %s was removed.", clazz.getSimpleName(), id));
    }
}
