org.trypticon.luceneupgrader.LuceneVersion Maven / Gradle / Ivy

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Lucene Index Upgrader
The newest version!
package org.trypticon.luceneupgrader;

import org.trypticon.luceneupgrader.lucene3.VersionUpgrader3;
import org.trypticon.luceneupgrader.lucene4.VersionUpgrader4;
import org.trypticon.luceneupgrader.lucene5.VersionUpgrader5;
import org.trypticon.luceneupgrader.lucene6.VersionUpgrader6;
import org.trypticon.luceneupgrader.lucene7.VersionUpgrader7;
import org.trypticon.luceneupgrader.lucene8.VersionUpgrader8;

import javax.annotation.Nonnull;
import java.nio.file.Path;

/**
 * Enumeration of versions of Lucene.
 */
public enum LuceneVersion {

    VERSION_1 {
        @Override
        protected VersionUpgrader createUpgrader(@Nonnull Path directory, @Nonnull InfoStream infoStream) {
            throw new UnsupportedOperationException("Upgrade from what?");
        }
    },

    VERSION_2 {
        @Override
        protected VersionUpgrader createUpgrader(@Nonnull Path directory, @Nonnull InfoStream infoStream) {
            throw new UnsupportedOperationException("TODO");
        }
    },

    VERSION_3 {
        @Override
        protected VersionUpgrader createUpgrader(@Nonnull Path directory, @Nonnull InfoStream infoStream) {
            return new VersionUpgrader3(directory, infoStream);
        }
    },

    VERSION_4 {
        @Override
        protected VersionUpgrader createUpgrader(@Nonnull Path directory, @Nonnull InfoStream infoStream) {
            return new VersionUpgrader4(directory, infoStream);
        }
    },

    VERSION_5 {
        @Override
        protected VersionUpgrader createUpgrader(@Nonnull Path directory, @Nonnull InfoStream infoStream) {
            return new VersionUpgrader5(directory, infoStream);
        }
    },

    VERSION_6 {
        @Override
        protected VersionUpgrader createUpgrader(@Nonnull Path directory, @Nonnull InfoStream infoStream) {
            return new VersionUpgrader6(directory, infoStream);
        }
    },

    VERSION_7 {
        @Override
        protected VersionUpgrader createUpgrader(@Nonnull Path directory, @Nonnull InfoStream infoStream) {
            return new VersionUpgrader7(directory, infoStream);
        }
    },

    VERSION_8 {
        @Override
        protected VersionUpgrader createUpgrader(@Nonnull Path directory, @Nonnull InfoStream infoStream) {
            return new VersionUpgrader8(directory, infoStream);
        }
    };

    /**
     * Tests whether this version is older than the given version.
     * 
     * @param version the version to compare against.
     * @return {@code true} if this version is older than the given version,
     *         {@code false} otherwise.
     */
    public boolean isOlderThan(LuceneVersion version) {
        return compareTo(version) < 0; // because we order them in the enum
    }

    /**
     * Overridden for each version to create an upgrader suitable for upgrading to that version.
     *
     * @param directory a directory containing the index.
     * @param infoStream an info stream to log to.
     * @return the upgrader.
     */
    protected abstract VersionUpgrader createUpgrader(@Nonnull Path directory, @Nonnull InfoStream infoStream);
}