Source Code Cross Referenced for BaseReflectionProjector.java in  » J2EE » hgcommons » biz » hammurapi » sql » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » J2EE » hgcommons » biz.hammurapi.sql 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * hgcommons 7
003:         * Hammurapi Group Common Library 
004:         * Copyright (C) 2003  Hammurapi Group
005:         *
006:         * This program is free software; you can redistribute it and/or
007:         * modify it under the terms of the GNU Lesser General Public
008:         * License as published by the Free Software Foundation; either
009:         * version 2 of the License, or (at your option) any later version.
010:         *
011:         * This program is distributed in the hope that it will be useful,
012:         * but WITHOUT ANY WARRANTY; without even the implied warranty of
013:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
014:         * Lesser General Public License for more details.
015:         *
016:         * You should have received a copy of the GNU Lesser General Public
017:         * License along with this library; if not, write to the Free Software
018:         * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
019:         *
020:         * URL: http://www.hammurapi.biz/hammurapi-biz/ef/xmenu/hammurapi-group/products/products/hgcommons/index.html
021:         * e-Mail: support@hammurapi.biz
022:         */
023:        package biz.hammurapi.sql;
024:
025:        import java.sql.ResultSet;
026:        import java.sql.SQLException;
027:        import java.util.Map;
028:        import java.util.StringTokenizer;
029:
030:        /**
031:         * Base class for reflection projectors.
032:         * @author Pavel Vlasov
033:         * @version $Revision: 1.2 $
034:         */
035:        public class BaseReflectionProjector {
036:
037:            private Map typeMap;
038:
039:            /**
040:             * @param typeMap type map to be used in java.sql.ResultSet.getField(String/int, Map) method
041:             */
042:            protected BaseReflectionProjector(Map typeMap) {
043:                this .typeMap = typeMap;
044:            }
045:
046:            /**
047:             * This implmentation uses ResultSet.getObject() method to obtain field value.
048:             * Override this method if needed to provide custom type conversion.
049:             * @param rs ResultSet
050:             * @param columnName Field name
051:             * @return Column value
052:             * @throws SQLException
053:             */
054:            protected Object getColumn(ResultSet rs, String columnName)
055:                    throws SQLException {
056:                return typeMap == null ? rs.getObject(columnName) : rs
057:                        .getObject(columnName, typeMap);
058:            }
059:
060:            /**
061:             * This implmentation uses ResultSet.getObject() method to obtain field value.
062:             * Override this method if needed to provide custom type conversion.
063:             * @param rs ResultSet
064:             * @param columnNo Column number
065:             * @return Field value
066:             * @throws SQLException
067:             */
068:            protected Object getColumn(ResultSet rs, int columnNo)
069:                    throws SQLException {
070:                return typeMap == null ? rs.getObject(columnNo) : rs.getObject(
071:                        columnNo, typeMap);
072:            }
073:
074:            /**
075:             * Converts column name such as "MY_COLUMN" to java property name such as myColumn
076:             * @param columnName
077:             * @return
078:             */
079:            public static String propertyName(String columnName) {
080:                StringTokenizer st = new StringTokenizer(columnName, "_");
081:                StringBuffer ret = new StringBuffer();
082:                boolean capitalize = false;
083:                while (st.hasMoreTokens()) {
084:                    String token = st.nextToken();
085:                    if (capitalize) {
086:                        ret.append(Character.toUpperCase(token.charAt(0)));
087:                        if (token.length() > 1) {
088:                            ret.append(token.substring(1).toLowerCase());
089:                        }
090:                    } else {
091:                        ret.append(token.toLowerCase());
092:                        capitalize = true;
093:                    }
094:                }
095:                return ret.toString();
096:            }
097:
098:            /**
099:             * MY_COLUMN -> getMyColumn
100:             * @param columnName
101:             * @return
102:             */
103:            public static String accessorName(String columnName) {
104:                String propertyName = propertyName(columnName);
105:                return "get"
106:                        + (propertyName.length() < 2 ? propertyName
107:                                .toUpperCase() : propertyName.substring(0, 1)
108:                                .toUpperCase()
109:                                + propertyName.substring(1));
110:            }
111:
112:            /**
113:             * MY_COLUMN -&gt; setMyColumn
114:             * @param columnName
115:             * @return
116:             */
117:            public static String mutatorName(String columnName) {
118:                String propertyName = propertyName(columnName);
119:                return "set"
120:                        + (propertyName.length() < 2 ? propertyName
121:                                .toUpperCase() : propertyName.substring(0, 1)
122:                                .toUpperCase()
123:                                + propertyName.substring(1));
124:            }
125:        }
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