class DropPrimaryKeyChange extends AbstractChange {
    private String catalogName;
    private String schemaName;
    private String tableName;
    private String constraintName;
    private Boolean dropIndex;

    @Override
    public boolean generateStatementsVolatile(Database database) {
        return database instanceof SQLiteDatabase;
    }

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

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

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

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

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

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

    @DatabaseChangeProperty(mustEqualExisting = "primaryKey", description = "Name of the primary key to drop")
    public String getConstraintName() {
        return constraintName;
    }

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

    @DatabaseChangeProperty(description = "Whether to drop the index associated with the primary key")
    public Boolean getDropIndex() {
        return dropIndex;
    }

    public void setDropIndex(Boolean dropIndex) {
        this.dropIndex = dropIndex;
    }

    @Override
    public SqlStatement[] generateStatements(Database database) {

        if (database instanceof SQLiteDatabase) {
    		// return special statements for SQLite databases
    		return generateStatementsForSQLiteDatabase(database);
        }

        DropPrimaryKeyStatement statement = new DropPrimaryKeyStatement(getCatalogName(), getSchemaName(), getTableName(), getConstraintName());
        statement.setDropIndex(this.dropIndex);
        return new SqlStatement[]{
                statement,
        };
    }

    @Override
    public ChangeStatus checkStatus(Database database) {<FILL_FUNCTION_BODY>}

    private SqlStatement[] generateStatementsForSQLiteDatabase(Database database) {
        SqlStatement[] sqlStatements = null;

        // Since SQLite does not support a drop column statement, use alter table visitor to copy the table
        // and disabling the primary key constraint from the column
        SQLiteDatabase.AlterTableVisitor alterTableVisitor = new SQLiteDatabase.AlterTableVisitor() {
            @Override
            public ColumnConfig[] getColumnsToAdd() {
                return new ColumnConfig[0];
            }

            @Override
            public boolean copyThisColumn(ColumnConfig column) {
                // toggle the primary key off
                if (column.getConstraints().isPrimaryKey()) {
                    column.getConstraints().setPrimaryKey(false);
                }
                return true;
            }

            @Override
            public boolean createThisColumn(ColumnConfig column) {
                // toggle the primary key off
                if (column.getConstraints().isPrimaryKey()) {
                    column.getConstraints().setPrimaryKey(false);
                }
                return true;
            }

            @Override
            public boolean createThisIndex(Index index) {
                return true;
            }
        };
        List<SqlStatement> statements;
        try {
            statements = SQLiteDatabase.getAlterTableStatements(alterTableVisitor, database, getCatalogName(), getSchemaName(), getTableName());
        } catch (DatabaseException e) {
            throw new UnexpectedLiquibaseException(e);
        }
        if (statements.size() > 0) {
            sqlStatements = new SqlStatement[statements.size()];
            return statements.toArray(sqlStatements);
        }
        return sqlStatements;
    }

    @Override
    public String getConfirmationMessage() {
        return "Primary key dropped from "+getTableName();
    }

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

        try {
            return new ChangeStatus().assertComplete(!SnapshotGeneratorFactory.getInstance().has(new PrimaryKey(getConstraintName(), getCatalogName(), getSchemaName(), getTableName()), database), "Primary key exists");
        } catch (Exception e) {
            return new ChangeStatus().unknown(e);
        }

    
<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