001/* 002 * Copyright 2012-2017 the original author or authors. 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * http://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 */ 016 017package org.springframework.boot.orm.jpa.hibernate; 018 019import java.util.Locale; 020 021import org.hibernate.boot.model.naming.Identifier; 022import org.hibernate.boot.model.naming.PhysicalNamingStrategy; 023import org.hibernate.engine.jdbc.env.spi.JdbcEnvironment; 024 025/** 026 * Hibernate {@link PhysicalNamingStrategy} that follows Spring recommended naming 027 * conventions. 028 * 029 * @author Phillip Webb 030 * @author Madhura Bhave 031 * @since 1.4.0 032 */ 033public class SpringPhysicalNamingStrategy implements PhysicalNamingStrategy { 034 035 @Override 036 public Identifier toPhysicalCatalogName(Identifier name, 037 JdbcEnvironment jdbcEnvironment) { 038 return apply(name, jdbcEnvironment); 039 } 040 041 @Override 042 public Identifier toPhysicalSchemaName(Identifier name, 043 JdbcEnvironment jdbcEnvironment) { 044 return apply(name, jdbcEnvironment); 045 } 046 047 @Override 048 public Identifier toPhysicalTableName(Identifier name, 049 JdbcEnvironment jdbcEnvironment) { 050 return apply(name, jdbcEnvironment); 051 } 052 053 @Override 054 public Identifier toPhysicalSequenceName(Identifier name, 055 JdbcEnvironment jdbcEnvironment) { 056 return apply(name, jdbcEnvironment); 057 } 058 059 @Override 060 public Identifier toPhysicalColumnName(Identifier name, 061 JdbcEnvironment jdbcEnvironment) { 062 return apply(name, jdbcEnvironment); 063 } 064 065 private Identifier apply(Identifier name, JdbcEnvironment jdbcEnvironment) { 066 if (name == null) { 067 return null; 068 } 069 StringBuilder builder = new StringBuilder(name.getText().replace('.', '_')); 070 for (int i = 1; i < builder.length() - 1; i++) { 071 if (isUnderscoreRequired(builder.charAt(i - 1), builder.charAt(i), 072 builder.charAt(i + 1))) { 073 builder.insert(i++, '_'); 074 } 075 } 076 return getIdentifier(builder.toString(), name.isQuoted(), jdbcEnvironment); 077 } 078 079 /** 080 * Get an identifier for the specified details. By default this method will return an 081 * identifier with the name adapted based on the result of 082 * {@link #isCaseInsensitive(JdbcEnvironment)} 083 * @param name the name of the identifier 084 * @param quoted if the identifier is quoted 085 * @param jdbcEnvironment the JDBC environment 086 * @return an identifier instance 087 */ 088 protected Identifier getIdentifier(String name, boolean quoted, 089 JdbcEnvironment jdbcEnvironment) { 090 if (isCaseInsensitive(jdbcEnvironment)) { 091 name = name.toLowerCase(Locale.ROOT); 092 } 093 return new Identifier(name, quoted); 094 } 095 096 /** 097 * Specify whether the database is case sensitive. 098 * @param jdbcEnvironment the JDBC environment which can be used to determine case 099 * @return true if the database is case insensitive sensitivity 100 */ 101 protected boolean isCaseInsensitive(JdbcEnvironment jdbcEnvironment) { 102 return true; 103 } 104 105 private boolean isUnderscoreRequired(char before, char current, char after) { 106 return Character.isLowerCase(before) && Character.isUpperCase(current) 107 && Character.isLowerCase(after); 108 } 109 110}