class DropUniqueConstraintChange extends AbstractChange {
    private String catalogName;
    private String schemaName;
    private String tableName;
    private String constraintName;
    /**
     * SAP SQL Anywhere (Sybase ASA) drops unique constraint not by name, but using list of the columns in UNIQUE clause.
     */
    private String uniqueColumns;

    @DatabaseChangeProperty(since = "3.0", mustEqualExisting ="uniqueConstraint.table.catalog",
        description = "Name of the database catalog")
    public String getCatalogName() {
        return catalogName;
    }

    public void setCatalogName(String catalogName) {
        this.catalogName = catalogName;
    }

    @DatabaseChangeProperty(mustEqualExisting ="uniqueConstraint.table.schema", description = "Name of the database schema")
    public String getSchemaName() {
        return schemaName;
    }

    public void setSchemaName(String schemaName) {
        this.schemaName = schemaName;
    }

    @DatabaseChangeProperty(
        description = "Name of the table to drop the unique constraint from",
        mustEqualExisting = "uniqueConstraint.table"
    )
    public String getTableName() {
        return tableName;
    }

    public void setTableName(String tableName) {
        this.tableName = tableName;
    }

    @DatabaseChangeProperty(description = "Name of the unique constraint to drop", mustEqualExisting = "uniqueConstraint")
    public String getConstraintName() {
        return constraintName;
    }

    public void setConstraintName(String constraintName) {
        this.constraintName = constraintName;
    }

    @DatabaseChangeProperty(exampleValue = "name",
        description = "For SAP SQL Anywhere, a list of columns in the UNIQUE clause",
        supportsDatabase = "sybase")
    public String getUniqueColumns() {
        return uniqueColumns;
    }

    public void setUniqueColumns(String uniqueColumns) {
        this.uniqueColumns = uniqueColumns;
    }

    @Override
    public SqlStatement[] generateStatements(Database database) {<FILL_FUNCTION_BODY>}

    @Override
    public ChangeStatus checkStatus(Database database) {
        try {
            UniqueConstraint example =
                new UniqueConstraint(getConstraintName(), getCatalogName(), getSchemaName(), getTableName());
            if (getUniqueColumns() != null) {
                for (String column : getUniqueColumns().split("\\s*,\\s*")) {
                    example.addColumn(example.getColumns().size(), new Column(column));
                }
            }
            return new ChangeStatus().assertComplete(
                !SnapshotGeneratorFactory.getInstance().has(example, database),
                "Unique constraint exists"
            );
        } catch (Exception e) {
            return new ChangeStatus().unknown(e);
        }
    }

    @Override
    public String getConfirmationMessage() {
        return "Unique constraint "+getConstraintName()+" dropped from "+getTableName();
    }

    @Override
    public String getSerializedObjectNamespace() {
        return STANDARD_CHANGELOG_NAMESPACE;
    }
}

        
        DropUniqueConstraintStatement statement =
            new DropUniqueConstraintStatement(getCatalogName(), getSchemaName(), getTableName(), getConstraintName());
        if (database instanceof SybaseASADatabase) {
            statement.setUniqueColumns(ColumnConfig.arrayFromNames(uniqueColumns));
        }
        return new SqlStatement[]{
            statement
        };
    
<methods>public void <init>() ,public liquibase.change.ChangeStatus checkStatus(liquibase.database.Database) ,public liquibase.change.ChangeMetaData createChangeMetaData() ,public boolean equals(java.lang.Object) ,public void finishInitialization() throws liquibase.exception.SetupException,public liquibase.change.CheckSum generateCheckSum() ,public liquibase.statement.SqlStatement[] generateRollbackStatements(liquibase.database.Database) throws liquibase.exception.RollbackImpossibleException,public boolean generateRollbackStatementsVolatile(liquibase.database.Database) ,public boolean generateStatementsVolatile(liquibase.database.Database) ,public Set<liquibase.structure.DatabaseObject> getAffectedDatabaseObjects(liquibase.database.Database) ,public liquibase.changelog.ChangeSet getChangeSet() ,public java.lang.String getDescription() ,public java.lang.String[] getExcludedFieldFilters(liquibase.ChecksumVersion) ,public liquibase.resource.ResourceAccessor getResourceAccessor() ,public java.lang.String getSerializableFieldNamespace(java.lang.String) ,public liquibase.serializer.LiquibaseSerializable.SerializationType getSerializableFieldType(java.lang.String) ,public java.lang.Object getSerializableFieldValue(java.lang.String) ,public Set<java.lang.String> getSerializableFields() ,public java.lang.String getSerializedObjectName() ,public java.lang.String getSerializedObjectNamespace() ,public int hashCode() ,public void load(liquibase.parser.core.ParsedNode, liquibase.resource.ResourceAccessor) throws liquibase.parser.core.ParsedNodeException,public void modify(liquibase.change.visitor.ChangeVisitor) throws liquibase.parser.core.ParsedNodeException,public liquibase.parser.core.ParsedNode serialize() throws liquibase.parser.core.ParsedNodeException,public void setChangeSet(liquibase.changelog.ChangeSet) ,public void setResourceAccessor(liquibase.resource.ResourceAccessor) ,public boolean shouldExecuteChange(liquibase.database.Database) ,public boolean supports(liquibase.database.Database) ,public boolean supportsRollback(liquibase.database.Database) ,public java.lang.String toString() ,public liquibase.exception.ValidationErrors validate(liquibase.database.Database) ,public liquibase.exception.Warnings warn(liquibase.database.Database) <variables>private static final java.util.regex.Pattern ALPHABET,protected static final java.lang.String NODENAME_COLUMN,private liquibase.changelog.ChangeSet changeSet