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DDL and DB Migration generation

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package io.ebeaninternal.dbmigration.ddlgeneration;

import io.ebeaninternal.dbmigration.model.MConfiguration;

import java.io.IOException;

/**
 * Buffer to append generated DDL to.
 */
public interface DdlBuffer {

  /**
   * Return the configuration (default tablespaces etc).
   */
  MConfiguration getConfiguration();

  /**
   * Return true if the buffer is empty.
   */
  boolean isEmpty();

  /**
   * Append a statement allowing for null or empty statements.
   */
  DdlBuffer appendStatement(String content) throws IOException;

  /**
   * Append DDL content to the buffer.
   */
  DdlBuffer append(String content) throws IOException;

  /**
   * Append DDL content to the buffer with space padding.
   */
  DdlBuffer append(String type, int space) throws IOException;

  /**
   * Append a value that is potentially null or empty and proceed it with a space if so.
   */
  DdlBuffer appendWithSpace(String foreignKeyRestrict) throws IOException;

  /**
   * Append new line character to the buffer.
   */
  DdlBuffer newLine() throws IOException;

  /**
   * Append the end of statement content.
   */
  DdlBuffer endOfStatement() throws IOException;

  /**
   * End of a change - add some whitespace.
   */
  DdlBuffer end() throws IOException;

  /**
   * Return the buffer content.
   */
  String getBuffer();

}