org.janusgraph.graphdb.configuration.validator.CompatibilityValidator.java Source code

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Here is the source code for org.janusgraph.graphdb.configuration.validator.CompatibilityValidator.java

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// Copyright 2018 JanusGraph Authors
//
// Licensed 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.janusgraph.graphdb.configuration.validator;

import com.google.common.base.Preconditions;
import org.janusgraph.core.JanusGraphException;
import org.janusgraph.graphdb.configuration.JanusGraphConstants;

/**
 * Validator for checking backward compatibility with Titan
 */
public class CompatibilityValidator {

    private static final String INCOMPATIBLE_VERSION_EXCEPTION = "Runtime version is incompatible with current JanusGraph version: JanusGraph [%1s] vs. runtime [%2s]";

    public static void validateBackwardCompatibilityWithTitan(String version,
            String localConfigurationIdsStoreName) {

        Preconditions.checkArgument(version != null,
                "JanusGraph version nor Titan compatibility have not been initialized");

        if (!JanusGraphConstants.TITAN_COMPATIBLE_VERSIONS.contains(version)) {
            throw new JanusGraphException(
                    String.format(INCOMPATIBLE_VERSION_EXCEPTION, version, JanusGraphConstants.VERSION));
        }

        // When connecting to a store created by Titan the ID store name will not be in the
        // global configuration as it was not something which was configurable with Titan.
        // So to ensure compatibility override the default to titan_ids.
        boolean localIdStoreIsDefault = JanusGraphConstants.JANUSGRAPH_ID_STORE_NAME
                .equals(localConfigurationIdsStoreName);

        boolean usingTitanIdStore = localIdStoreIsDefault
                || JanusGraphConstants.TITAN_ID_STORE_NAME.equals(localConfigurationIdsStoreName);

        Preconditions.checkArgument(usingTitanIdStore,
                "ID store for Titan compatibility has not been initialized to: "
                        + JanusGraphConstants.TITAN_ID_STORE_NAME);
    }

}