TableComparator.java

package liquibase.diff.compare.core;

import liquibase.database.Database;
import liquibase.diff.ObjectDifferences;
import liquibase.diff.compare.CompareControl;
import liquibase.diff.compare.DatabaseObjectComparator;
import liquibase.diff.compare.DatabaseObjectComparatorChain;
import liquibase.diff.compare.DatabaseObjectComparatorFactory;
import liquibase.structure.DatabaseObject;
import liquibase.structure.core.Table;

import java.util.Set;

public class TableComparator  implements DatabaseObjectComparator {
    @Override
    public int getPriority(Class<? extends DatabaseObject> objectType, Database database) {
        if (Table.class.isAssignableFrom(objectType)) {
            return PRIORITY_TYPE;
        }
        return PRIORITY_NONE;
    }

    @Override
    public String[] hash(DatabaseObject databaseObject, Database accordingTo, DatabaseObjectComparatorChain chain) {
        return chain.hash(databaseObject, accordingTo);
    }

    @Override
    public boolean isSameObject(DatabaseObject databaseObject1, DatabaseObject databaseObject2, Database accordingTo, DatabaseObjectComparatorChain chain) {
        if (!(databaseObject1 instanceof Table && databaseObject2 instanceof Table)) {
            return false;
        }

        //short circut chain.isSameObject for performance reasons. There can be a lot of tables in a database and they are compared a lot
        if (!DefaultDatabaseObjectComparator.nameMatches(databaseObject1, databaseObject2, accordingTo)) {
            return false;
        }

        if (!DatabaseObjectComparatorFactory.getInstance().isSameObject(databaseObject1.getSchema(), databaseObject2.getSchema(), chain.getSchemaComparisons(), accordingTo)) {
            return false;
        }


        return true;
    }


    @Override
    public ObjectDifferences findDifferences(DatabaseObject databaseObject1, DatabaseObject databaseObject2, Database accordingTo, CompareControl compareControl, DatabaseObjectComparatorChain chain, Set<String> exclude) {
        exclude.add("indexes");
        exclude.add("name");
        exclude.add("outgoingForeignKeys");
        exclude.add("uniqueConstraints");
        exclude.add("primaryKey");
        exclude.add("columns");
        exclude.add("schema");

        ObjectDifferences differences = chain.findDifferences(databaseObject1, databaseObject2, accordingTo, compareControl, exclude);
        differences.compare("name", databaseObject1, databaseObject2, new ObjectDifferences.DatabaseObjectNameCompareFunction(Table.class, accordingTo));

        return differences;
    }
}