Source Code Cross Referenced for SqlHelper.java in  » Database-ORM » db-ojb » org » apache » ojb » broker » util » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database ORM » db ojb » org.apache.ojb.broker.util 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        package org.apache.ojb.broker.util;
002:
003:        /* Copyright 2002-2005 The Apache Software Foundation
004:         *
005:         * Licensed under the Apache License, Version 2.0 (the "License");
006:         * you may not use this file except in compliance with the License.
007:         * You may obtain a copy of the License at
008:         *
009:         *     http://www.apache.org/licenses/LICENSE-2.0
010:         *
011:         * Unless required by applicable law or agreed to in writing, software
012:         * distributed under the License is distributed on an "AS IS" BASIS,
013:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014:         * See the License for the specific language governing permissions and
015:         * limitations under the License.
016:         */
017:
018:        import java.sql.ResultSet;
019:        import java.sql.SQLException;
020:
021:        import org.apache.commons.lang.StringUtils;
022:
023:        /**
024:         * Helper class for all SQL related stuff.
025:         * 
026:         * @author <a href="mailto:armin@codeAuLait.de">Armin Waibel </a>
027:         * @version $Id: SqlHelper.java,v 1.24.2.4 2005/12/21 22:27:47 tomdz Exp $
028:         */
029:        public class SqlHelper {
030:            /** define the name of the pseudo column holding the class to be instantiated. */
031:            public static final String OJB_CLASS_COLUMN = "OJB_CLAZZ";
032:
033:            /**
034:             * Helper Class for a split column <br>
035:             * ie: sum (distinct amount) as theAmount
036:             * 
037:             * <pre>
038:             *  prefix = 'sum (distinct '
039:             *  column = 'amount'
040:             *  suffix = ') as theAmount'
041:             * </pre>
042:             */
043:            public static final class PathInfo {
044:                public String column;
045:                public String prefix;
046:                public String suffix;
047:                public final String path; //original Path
048:
049:                PathInfo(String aPath, String aPrefix, String aColumn,
050:                        String aSuffix) {
051:                    path = aPath;
052:                    column = aColumn;
053:                    prefix = aPrefix;
054:                    suffix = aSuffix;
055:                }
056:            }
057:
058:            /**
059:             * remove functions and () from path <br>
060:             * ie: avg(amount) -> amount <br>
061:             * ie: sum (accounts.amount) -> accounts.amount <br>
062:             * ie: count(distinct id) as theCount-> id <br>
063:             * 
064:             * @param aPath
065:             *            the path to the attribute
066:             */
067:            public static String cleanPath(String aPath) {
068:                return splitPath(aPath).column;
069:            }
070:
071:            /**
072:             * Split a path into column , prefix and suffix, the prefix contains all
073:             * info up to the column <br>
074:             * ie: avg(amount) -> amount , avg( , )<br>
075:             * ie: sum (accounts.amount) as theSum -> accounts.amount , sum( , ) as
076:             * theSum <br>
077:             * ie: count( distinct id ) as bla -> id , count(distinct , ) as bla <br>
078:             * Supports simple expressions ie: price * 1.05
079:             * 
080:             * TODO: cannot resolve multiple attributes in expression 
081:             * ie: price - bonus
082:             * 
083:             * @param aPath
084:             * @return PathInfo
085:             */
086:            public static PathInfo splitPath(String aPath) {
087:                String prefix = null;
088:                String suffix = null;
089:                String colName = aPath;
090:
091:                if (aPath == null) {
092:                    return new PathInfo(null, null, null, null);
093:                }
094:
095:                // ignore leading ( and trailing ) ie: sum(avg(col1))
096:                int braceBegin = aPath.lastIndexOf("(");
097:                int braceEnd = aPath.indexOf(")");
098:                int opPos = StringUtils.indexOfAny(aPath, "+-/*");
099:
100:                if (braceBegin >= 0 && braceEnd >= 0 && braceEnd > braceBegin) {
101:                    int colBegin;
102:                    int colEnd;
103:                    String betweenBraces;
104:
105:                    betweenBraces = aPath.substring(braceBegin + 1, braceEnd)
106:                            .trim();
107:                    // look for ie 'distinct name'
108:                    colBegin = betweenBraces.indexOf(" ");
109:                    // look for multiarg function like to_char(col,'format_mask')
110:                    colEnd = betweenBraces.indexOf(",");
111:                    colEnd = colEnd > 0 ? colEnd : betweenBraces.length();
112:                    prefix = aPath.substring(0, braceBegin + 1)
113:                            + betweenBraces.substring(0, colBegin + 1);
114:                    colName = betweenBraces.substring(colBegin + 1, colEnd);
115:                    suffix = betweenBraces.substring(colEnd)
116:                            + aPath.substring(braceEnd);
117:                } else if (opPos >= 0) {
118:                    colName = aPath.substring(0, opPos).trim();
119:                    suffix = aPath.substring(opPos);
120:                }
121:
122:                return new PathInfo(aPath, prefix, colName.trim(), suffix);
123:            }
124:
125:            /**
126:             * Returns the name of the class to be instantiated.
127:             * @param rs the Resultset
128:             * @return null if the column is not available
129:             */
130:            public static String getOjbClassName(ResultSet rs) {
131:                try {
132:                    return rs.getString(OJB_CLASS_COLUMN);
133:                } catch (SQLException e) {
134:                    return null;
135:                }
136:            }
137:
138:        }
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