Source Code Cross Referenced for NoMinCharConverter.java in  » Testing » PolePosition-0.20 » com » versant » core » jdbc » sql » conv » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Testing » PolePosition 0.20 » com.versant.core.jdbc.sql.conv 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright (c) 1998 - 2005 Versant Corporation
003:         * All rights reserved. This program and the accompanying materials
004:         * are made available under the terms of the Eclipse Public License v1.0
005:         * which accompanies this distribution, and is available at
006:         * http://www.eclipse.org/legal/epl-v10.html
007:         *
008:         * Contributors:
009:         * Versant Corporation - initial API and implementation
010:         */
011:        package com.versant.core.jdbc.sql.conv;
012:
013:        import com.versant.core.jdbc.JdbcConverter;
014:        import com.versant.core.jdbc.JdbcConverterFactory;
015:        import com.versant.core.jdbc.JdbcTypeRegistry;
016:        import com.versant.core.jdbc.metadata.JdbcColumn;
017:        import com.versant.core.metadata.MDStatics;
018:
019:        import javax.jdo.JDOFatalDataStoreException; //todo: appears only in throws clause
020:        import java.sql.PreparedStatement;
021:        import java.sql.SQLException;
022:        import java.sql.ResultSet;
023:
024:        /**
025:         * This is a converter for databases that do not handle \u0000
026:         * (Character.MIN_VALUE) propertly (e.g. Postgres and Informix). A char with
027:         * value \u0000 must set as an empty String.
028:         *
029:         * @keep-all
030:         */
031:        public class NoMinCharConverter extends JdbcConverterBase {
032:            private char defaultChar;
033:
034:            public static class Factory extends NoArgJdbcConverterFactory {
035:
036:                private NoMinCharConverter converter;
037:
038:                /**
039:                 * Create a converter for col using props as parameters. Return null if
040:                 * no converter is required.
041:                 */
042:                public JdbcConverter createJdbcConverter(JdbcColumn col,
043:                        Object args, JdbcTypeRegistry jdbcTypeRegistry) {
044:                    if (converter == null)
045:                        converter = new NoMinCharConverter();
046:                    return converter;
047:                }
048:
049:            }
050:
051:            /**
052:             * Get the value of col from rs at position index.
053:             * @exception SQLException on SQL errors
054:             * @exception JDOFatalDataStoreException if the ResultSet value is invalid
055:             */
056:            public Object get(ResultSet rs, int index, JdbcColumn col)
057:                    throws SQLException, JDOFatalDataStoreException {
058:                String s = rs.getString(index);
059:                if (s == null || s.length() == 0) {
060:                    if (rs.wasNull()) {
061:                        if (col.javaTypeCode == MDStatics.CHAR) {
062:                            return new Character(defaultChar);
063:                        } else {
064:                            return null;
065:                        }
066:                    } else {
067:                        return new Character(defaultChar);
068:                    }
069:                }
070:                return new Character(s.charAt(0));
071:            }
072:
073:            /**
074:             * Set parameter index on ps to value (for col).
075:             * @exception SQLException on SQL errors
076:             * @exception JDOFatalDataStoreException if value is invalid
077:             */
078:            public void set(PreparedStatement ps, int index, JdbcColumn col,
079:                    Object value) throws SQLException,
080:                    JDOFatalDataStoreException {
081:                if (value == null) {
082:                    ps.setNull(index, col.jdbcType);
083:                } else {
084:                    Character c = (Character) value;
085:                    char cv = c.charValue();
086:                    String s = cv == Character.MIN_VALUE ? "" : new String(
087:                            new char[] { cv });
088:                    ps.setString(index, s);
089:                }
090:            }
091:
092:            /**
093:             * Get the type of our expected value objects (e.g. java.util.Locale
094:             * for a converter for Locale's).
095:             */
096:            public Class getValueType() {
097:                return Character.class;
098:            }
099:
100:        }
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