/**
 * 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.pulsar.broker.service.schema;

import org.apache.pulsar.common.policies.data.SchemaAutoUpdateCompatibilityStrategy;

public enum SchemaCompatibilityStrategy {
    /**
     * Always incompatible
     */
    ALWAYS_INCOMPATIBLE,

    /**
     * Always compatible
     */
    ALWAYS_COMPATIBLE,

    /**
     * Messages written by a new schema can be read by an old schema
     */
    BACKWARD,

    /**
     * Messages written by an old schema can be read be a new schema
     */
    FORWARD,

    /**
     * Equivalent to both FORWARD and BACKWARD
     */
    FULL;

    public static SchemaCompatibilityStrategy fromAutoUpdatePolicy(SchemaAutoUpdateCompatibilityStrategy strategy) {
        if (strategy == null) {
            return SchemaCompatibilityStrategy.ALWAYS_INCOMPATIBLE;
        }
        switch (strategy) {
        case Backward:
            return BACKWARD;
        case Forward:
            return FORWARD;
        case Full:
            return FULL;
        case AlwaysCompatible:
            return ALWAYS_COMPATIBLE;
        case AutoUpdateDisabled:
        default:
            return ALWAYS_INCOMPATIBLE;
        }
    }
}

/**
 * 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.pulsar.broker.service.schema;

import org.apache.pulsar.common.policies.data.SchemaAutoUpdateCompatibilityStrategy;

public enum SchemaCompatibilityStrategy {
    /**
     * Always incompatible
     */
    ALWAYS_INCOMPATIBLE,

    /**
     * Always compatible
     */
    ALWAYS_COMPATIBLE,

    /**
     * Messages written by an old schema can be read by a new schema
     */
    BACKWARD,

    /**
     * Messages written by a new schema can be read by an old schema
     */
    FORWARD,

    /**
     * Equivalent to both FORWARD and BACKWARD
     */
    FULL;

    public static SchemaCompatibilityStrategy fromAutoUpdatePolicy(SchemaAutoUpdateCompatibilityStrategy strategy) {
        if (strategy == null) {
            return SchemaCompatibilityStrategy.ALWAYS_INCOMPATIBLE;
        }
        switch (strategy) {
        case Backward:
            return BACKWARD;
        case Forward:
            return FORWARD;
        case Full:
            return FULL;
        case AlwaysCompatible:
            return ALWAYS_COMPATIBLE;
        case AutoUpdateDisabled:
        default:
            return ALWAYS_INCOMPATIBLE;
        }
    }
}

Fix comments of schema compatibility strategy. (#3923)