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.Column;
import java.util.Set;
public class ColumnComparator implements DatabaseObjectComparator {
@Override
public int getPriority(Class<? extends DatabaseObject> objectType, Database database) {
if (Column.class.isAssignableFrom(objectType)) {
return PRIORITY_TYPE;
}
return PRIORITY_NONE;
}
@Override
public String[] hash(DatabaseObject databaseObject, Database accordingTo, DatabaseObjectComparatorChain chain) {
Column column = (Column) databaseObject;
if (column.getRelation() == null) {
return new String[] {(column.getName()).toLowerCase()};
} else {
return new String[] {(column.getRelation().getName() + ":" + column.getName()).toLowerCase()};
}
}
@Override
public boolean isSameObject(DatabaseObject databaseObject1, DatabaseObject databaseObject2, Database accordingTo, DatabaseObjectComparatorChain chain) {
if (!(databaseObject1 instanceof Column && databaseObject2 instanceof Column)) {
return false;
}
Column thisColumn = (Column) databaseObject1;
Column otherColumn = (Column) databaseObject2;
//short circut chain.isSameObject for performance reasons. There can be a lot of columns in a database
if (!DefaultDatabaseObjectComparator.nameMatches(thisColumn, otherColumn, accordingTo)) {
return false;
}
if (!DatabaseObjectComparatorFactory.getInstance().isSameObject(thisColumn.getRelation(), otherColumn.getRelation(), accordingTo)) {
return false;
}
return true;
}
@Override
public ObjectDifferences findDifferences(DatabaseObject databaseObject1, DatabaseObject databaseObject2, Database accordingTo, CompareControl compareControl, DatabaseObjectComparatorChain chain, Set<String> exclude) {
exclude.add("name");
exclude.add("type");
ObjectDifferences differences = chain.findDifferences(databaseObject1, databaseObject2, accordingTo, compareControl, exclude);
differences.compare("name", databaseObject1, databaseObject2, new ObjectDifferences.DatabaseObjectNameCompareFunction(Column.class, accordingTo));
differences.compare("type", databaseObject1, databaseObject2, new ObjectDifferences.DatabaseObjectNameCompareFunction(Column.class, accordingTo));
return differences;
}
}