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 * 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   *
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 *   http://www.apache.org/licenses/LICENSE-2.0                 *
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 * 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.                                           *
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package org.apache.james.backends.cassandra.versions;

import java.util.Objects;

public class SchemaTransition {

    public static SchemaTransition to(SchemaVersion toVersion) {
        return new SchemaTransition(toVersion);
    }

    private final SchemaVersion toVersion;

    private SchemaTransition(SchemaVersion toVersion) {
        this.toVersion = toVersion;
    }

    public String fromAsString() {
        return String.valueOf(toVersion.previous().getValue());
    }

    public String toAsString() {
        return String.valueOf(toVersion.getValue());
    }

    public SchemaVersion from() {
        return toVersion.previous();
    }

    public SchemaVersion to() {
        return toVersion;
    }

    @Override
    public final boolean equals(Object o) {
        if (o instanceof SchemaTransition) {
            SchemaTransition that = (SchemaTransition) o;
            return Objects.equals(toVersion, that.toVersion);
        }
        return false;
    }

    @Override
    public final int hashCode() {
        return Objects.hash(toVersion);
    }

    @Override
    public String toString() {
        return "SchemaTransition{ from " + fromAsString() + " to " + toAsString() + "}";
    }
}
