/*
    * Copyright 2010 James Pether Sörling
    *
    * Licensed under the Apache License, Version 2.0 (the "License");
    * you may not use this file except in compliance with the License.
    * You may obtain a copy of the License at
    *
    *   http://www.apache.org/licenses/LICENSE-2.0
    *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   *
   *	$Id$
   *  $HeadURL$
  */
  package com.hack23.cia.service.data.impl;
  
  import java.util.Locale;
  
  import org.apache.commons.lang.StringUtils;
  import org.hibernate.boot.model.naming.Identifier;
  import org.hibernate.boot.model.naming.PhysicalNamingStrategy;
  import org.hibernate.engine.jdbc.env.spi.JdbcEnvironment;
  
  
  /**
   * The Class LegacyNamingStrategy.
   */
  public final class LegacyNamingStrategy implements PhysicalNamingStrategy {
  
      private static final String REG_EXPR = "([a-z])([A-Z])";
      private static final String REPLACEMENT_PATTERN = "$1_$2";
  
  
      /**
  	 * Instantiates a new legacy naming strategy.
  	 */
      public LegacyNamingStrategy() {
  		super();
  	}
  
      /**
  	 * Convert.
  	 *
  	 * @param identifier
  	 *            the identifier
  	 * @return the identifier
  	 */
      private static Identifier convert(final Identifier identifier) {
      	if (identifier == null || StringUtils.isBlank(identifier.getText())) {
              return identifier;
          } else {
          	return Identifier.toIdentifier(identifier.getText().replaceAll(REG_EXPR, REPLACEMENT_PATTERN).toLowerCase(Locale.ENGLISH));
          }
      }
  
      @Override
      public Identifier toPhysicalCatalogName(final Identifier identifier, final JdbcEnvironment jdbcEnv) {
          return convert(identifier);
      }
  
      @Override
      public Identifier toPhysicalColumnName(final Identifier identifier, final JdbcEnvironment jdbcEnv) {
          return convert(identifier);
      }
  
      @Override
      public Identifier toPhysicalSchemaName(final Identifier identifier, final JdbcEnvironment jdbcEnv) {
          return convert(identifier);
      }
  
      @Override
      public Identifier toPhysicalSequenceName(final Identifier identifier, final JdbcEnvironment jdbcEnv) {
          return convert(identifier);
      }
  
      @Override
      public Identifier toPhysicalTableName(final Identifier identifier, final JdbcEnvironment jdbcEnv) {
          return convert(identifier);
      }
  
  }