Source Code Cross Referenced for Lookup.java in  » Testing » Marathon » com » ziclix » python » sql » connect » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Testing » Marathon » com.ziclix.python.sql.connect 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Jython Database Specification API 2.0
003:         *
004:         * $Id: Lookup.java 2414 2005-02-23 04:26:23Z bzimmer $
005:         *
006:         * Copyright (c) 2001 brian zimmer <bzimmer@ziclix.com>
007:         *
008:         */
009:        package com.ziclix.python.sql.connect;
010:
011:        import java.sql.*;
012:        import java.util.*;
013:        import java.lang.reflect.Field;
014:        import javax.sql.*;
015:        import javax.naming.*;
016:
017:        import org.python.core.*;
018:        import com.ziclix.python.sql.*;
019:        import com.ziclix.python.sql.util.*;
020:
021:        /**
022:         * Establish a connection through a JNDI lookup.  The bound object can be either a <code>DataSource</code>,
023:         * <code>ConnectionPooledDataSource</code>, <code>Connection</code> or a <code>String</code>.  If it's a
024:         * <code>String</code> the value is passed to the DriverManager to obtain a connection, otherwise the
025:         * <code>Connection</code> is established using the object.
026:         *
027:         * @author brian zimmer
028:         * @author last revised by $Author: bzimmer $
029:         * @version $Revision: 2414 $
030:         */
031:        public class Lookup extends PyObject {
032:
033:            private static final PyString _doc = new PyString(
034:                    "establish a connection through a JNDI lookup");
035:
036:            /**
037:             * Constructor Lookup
038:             */
039:            public Lookup() {
040:            }
041:
042:            /**
043:             * Method __findattr__
044:             *
045:             * @param name
046:             * @return PyObject
047:             */
048:            public PyObject __findattr__(String name) {
049:
050:                if ("__doc__".equals(name)) {
051:                    return _doc;
052:                }
053:
054:                return super .__findattr__(name);
055:            }
056:
057:            /**
058:             * Expects a single PyString argument which is the JNDI name of the bound Connection or DataSource.
059:             * If any keywords are passed, an attempt is made to match the keyword to a static final Field on
060:             * javax.naming.Context.  If the Field is found, the value of the Field is substituted as the key
061:             * and the value of the keyword is the value put in the Hashtable environment.  If the Field is not
062:             * found, the key is the keyword with no substitutions.
063:             */
064:            public PyObject __call__(PyObject[] args, String[] keywords) {
065:
066:                Object ref = null;
067:                Connection connection = null;
068:                Hashtable env = new Hashtable();
069:
070:                // figure out the correct params
071:                PyArgParser parser = new PyArgParser(args, keywords);
072:                Object jndiName = parser.arg(0).__tojava__(String.class);
073:
074:                if ((jndiName == null) || (jndiName == Py.NoConversion)) {
075:                    throw zxJDBC.makeException(zxJDBC.DatabaseError,
076:                            "lookup name is null");
077:                }
078:
079:                // add any Context properties
080:                String[] kws = parser.kws();
081:
082:                for (int i = 0; i < kws.length; i++) {
083:                    String keyword = kws[i], fieldname = null;
084:                    Object value = parser.kw(keyword).__tojava__(Object.class);
085:
086:                    try {
087:                        Field field = Context.class.getField(keyword);
088:
089:                        fieldname = (String) field.get(Context.class);
090:                    } catch (IllegalAccessException e) {
091:                        throw zxJDBC.makeException(zxJDBC.ProgrammingError, e);
092:                    } catch (NoSuchFieldException e) {
093:                        fieldname = keyword;
094:                    }
095:
096:                    env.put(fieldname, value);
097:                }
098:
099:                InitialContext context = null;
100:
101:                try {
102:                    context = new InitialContext(env);
103:                    ref = context.lookup((String) jndiName);
104:                } catch (NamingException e) {
105:                    throw zxJDBC.makeException(zxJDBC.DatabaseError, e);
106:                } finally {
107:                    if (context != null) {
108:                        try {
109:                            context.close();
110:                        } catch (NamingException e) {
111:                        }
112:                    }
113:                }
114:
115:                if (ref == null) {
116:                    throw zxJDBC.makeException(zxJDBC.ProgrammingError,
117:                            "object [" + jndiName + "] not found in JNDI");
118:                }
119:
120:                try {
121:                    if (ref instanceof  String) {
122:                        connection = DriverManager
123:                                .getConnection(((String) ref));
124:                    } else if (ref instanceof  Connection) {
125:                        connection = (Connection) ref;
126:                    } else if (ref instanceof  DataSource) {
127:                        connection = ((DataSource) ref).getConnection();
128:                    } else if (ref instanceof  ConnectionPoolDataSource) {
129:                        connection = ((ConnectionPoolDataSource) ref)
130:                                .getPooledConnection().getConnection();
131:                    }
132:                } catch (SQLException e) {
133:                    throw zxJDBC.makeException(zxJDBC.DatabaseError, e);
134:                }
135:
136:                try {
137:                    if ((connection == null) || connection.isClosed()) {
138:                        throw zxJDBC.makeException(zxJDBC.DatabaseError,
139:                                "unable to establish connection");
140:                    }
141:
142:                    return new PyConnection(connection);
143:                } catch (SQLException e) {
144:                    throw zxJDBC.makeException(zxJDBC.DatabaseError, e);
145:                }
146:            }
147:
148:            /**
149:             * Method toString
150:             *
151:             * @return String
152:             */
153:            public String toString() {
154:                return "<lookup object instance at " + Py.id(this ) + ">";
155:            }
156:
157:            // __class__ boilerplate -- see PyObject for details
158:
159:            /**
160:             * Field __class__
161:             */
162:            public static PyClass __class__;
163:
164:            /**
165:             * Method getPyClass
166:             *
167:             * @return PyClass
168:             */
169:            protected PyClass getPyClass() {
170:                return __class__;
171:            }
172:        }
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