liquibase.ext.hibernate.diff.MissingIndexChangeGenerator Maven / Gradle / Ivy

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Liquibase extension for hibernate integration including generating changesets based on changed hibernate mapping files. Supports Hibernate 4.0 through 4.2.

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package liquibase.ext.hibernate.diff;

import liquibase.change.Change;
import liquibase.database.Database;
import liquibase.diff.output.DiffOutputControl;
import liquibase.diff.output.changelog.ChangeGeneratorChain;
import liquibase.ext.hibernate.database.HibernateDatabase;
import liquibase.structure.DatabaseObject;
import liquibase.structure.core.Index;

/**
 * Indexes tend to be added in the database that don't correspond to what is in Hibernate, so we suppress all dropIndex changes
 * based on indexes defined in the database but not in hibernate.
 */
public class MissingIndexChangeGenerator extends liquibase.diff.output.changelog.core.MissingIndexChangeGenerator {

    @Override
    public int getPriority(Class objectType, Database database) {
        if (Index.class.isAssignableFrom(objectType)) {
            return PRIORITY_ADDITIONAL;
        }
        return PRIORITY_NONE;
    }

    @Override
    public Change[] fixMissing(DatabaseObject missingObject, DiffOutputControl control, Database referenceDatabase, Database comparisonDatabase, ChangeGeneratorChain chain) {
        if (referenceDatabase instanceof HibernateDatabase || comparisonDatabase instanceof HibernateDatabase) {
            return null;
        } else {
            return super.fixMissing(missingObject, control, referenceDatabase, comparisonDatabase, chain);
        }
    }
}