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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
 *
 *      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.flink.cdc.common.configuration;

/** A key with FallbackKeys will fall back to the FallbackKeys if it itself is not configured. */
public class FallbackKey {

    // -------------------------
    //  Factory methods
    // -------------------------

    static FallbackKey createFallbackKey(String key) {
        return new FallbackKey(key, false);
    }

    static FallbackKey createDeprecatedKey(String key) {
        return new FallbackKey(key, true);
    }

    // ------------------------------------------------------------------------

    private final String key;

    private final boolean isDeprecated;

    public String getKey() {
        return key;
    }

    public boolean isDeprecated() {
        return isDeprecated;
    }

    private FallbackKey(String key, boolean isDeprecated) {
        this.key = key;
        this.isDeprecated = isDeprecated;
    }

    // ------------------------------------------------------------------------

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        } else if (o != null && o.getClass() == FallbackKey.class) {
            FallbackKey that = (FallbackKey) o;
            return this.key.equals(that.key) && (this.isDeprecated == that.isDeprecated);
        } else {
            return false;
        }
    }

    @Override
    public int hashCode() {
        return 31 * key.hashCode() + (isDeprecated ? 1 : 0);
    }

    @Override
    public String toString() {
        return String.format("{key=%s, isDeprecated=%s}", key, isDeprecated);
    }
}