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JDBC Driver for the Firebird RDBMS
/*
* Firebird Open Source J2ee connector - jdbc driver
*
* Distributable under LGPL license.
* You may obtain a copy of the License at http://www.gnu.org/copyleft/lgpl.html
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* LGPL License for more details.
*
* This file was created by members of the firebird development team.
* All individual contributions remain the Copyright (C) of those
* individuals. Contributors to this file are either listed here or
* can be obtained from a CVS history command.
*
* All rights reserved.
*/
package org.firebirdsql.jdbc;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.Field;
import java.sql.Connection;
import java.util.*;
import org.firebirdsql.gds.GDS;
import org.firebirdsql.gds.ISCConstants;
import org.firebirdsql.jca.FBConnectionRequestInfo;
import org.firebirdsql.jca.FBResourceException;
/**
* This class maps the extended JDBC properties to the
* {@link FBConnectionRequestInfo} instance. It uses
* java.lang.reflection. to determine correct type of the parameter
* passed to the {@link java.sql.Driver#connect(String, Properties)} method.
*
* @author Roman Rokytskyy
* @version 1.0
*/
public class FBConnectionHelper {
private static final int TYPE_UNKNOWN = 0;
private static final int TYPE_BOOLEAN = 1;
private static final int TYPE_BYTE = 2;
private static final int TYPE_INT = 3;
private static final int TYPE_STRING = 4;
public static final String TRANSACTION_SERIALIZABLE = "TRANSACTION_SERIALIZABLE";
public static final String TRANSACTION_REPEATABLE_READ = "TRANSACTION_REPEATABLE_READ";
public static final String TRANSACTION_READ_COMMITTED = "TRANSACTION_READ_COMMITTED";
public static final String DPB_PREFIX = "isc_dpb_";
public static final String TPB_PREFIX = "isc_tpb_";
public static final String TPB_MAPPING_PROPERTY = "tpb_mapping";
public static final String ISC_DPB_TYPES_RESOURCE =
"isc_dpb_types.properties";
private static final HashMap dpbTypes = new HashMap();
private static final HashMap dpbParameterTypes = new HashMap();
private static final HashMap tpbTypes = new HashMap();
/*
* Initialize mappings between various GDS constant names and
* their values. This operation should be executed only once.
*/
static {
Class iscClass = ISCConstants.class;
Field[] fields = iscClass.getFields();
for(int i = 0; i < fields.length; i++) {
if (!fields[i].getType().getName().equals("int"))
continue;
String name = fields[i].getName();
Integer value;
try {
value = (Integer)fields[i].get(null);
} catch(IllegalAccessException iaex) {
continue;
}
if (name.startsWith(DPB_PREFIX)) {
// put the correct parameter name
dpbTypes.put(name.substring(DPB_PREFIX.length()), value);
// put the full name to tolerate people's mistakes
dpbTypes.put(name, value);
} else
if (name.startsWith(TPB_PREFIX)) {
// put the correct parameter name
tpbTypes.put(name.substring(TPB_PREFIX.length()), value);
// put the full name to tolerate people's mistakes
tpbTypes.put(name, value);
} else
continue;
}
loadDpbParameterTypes();
}
/**
* Get integer value of the DPB key corresponding to the specified name.
*
* @param name name of the key.
*
* @return instance of {@link Integer} corresponding to the specified name
* or null if value is not known.
*/
public static Integer getDpbKey(String name) {
return (Integer)dpbTypes.get(name);
}
/**
* Get mapping between DPB names and their keys.
*
* @return instance of {@link Map}, where key is the name of DPB parameter,
* value is its DPB key.
*/
public static Map getDpbMap() {
return Collections.unmodifiableMap(dpbTypes);
}
public static Object parseDpbString(String name, Object value) {
// for the sake of unification we allow passing boolean, byte and integer
// types too, we loose some cycles here, but that is called relatively
// rarely, a tradeoff between code maintainability and CPU cycles.
if (value instanceof Boolean || value instanceof Byte || value instanceof Integer)
return value;
// if passed value is not string, throw an exception
if (value != null && !(value instanceof String))
throw new ClassCastException(value.getClass().getName());
Integer type = (Integer)dpbParameterTypes.get(name);
if (type == null)
type = new Integer(TYPE_UNKNOWN);
switch(type.intValue()) {
case TYPE_BOOLEAN :
return "".equals(value) ? Boolean.TRUE : Boolean.valueOf((String)value);
case TYPE_BYTE :
return new Byte((String)value);
case TYPE_INT :
return new Integer((String)value);
case TYPE_STRING :
return value;
case TYPE_UNKNOWN :
default :
/* set the value of the DPB by probing to convert string
* into int or byte value, this method gives very good result
* for guessing the method to call from the actual value;
* null values and empty strings are assumed to be booleans.
*/
if (value == null || "".equals(value))
return Boolean.TRUE;
try {
// try to deal with a value as a byte or int
int intValue = Integer.parseInt((String)value);
if (intValue < 256)
return new Byte((byte) intValue);
else
return new Integer(intValue);
} catch (NumberFormatException nfex) {
// all else fails: return as is (string)
return value;
}
}
}
/**
* This method extracts TPB mapping information from the connection
* parameters and adds it to the connectionProperties. Two formats are supported:
*
* info contains "tpb_mapping" parameter
* pointing to a resource bundle with mapping information;
* info contains separate mappings for each of following
* transaction isolation levels: "TRANSACTION_SERIALIZABLE",
* "TRANSACTION_REPEATABLE_READ" and
* "TRANSACTION_READ_COMMITTED".
*
*
* @param gds GDS object
* @param connectionProperties FirebirdConnectionProperties to set transaction state
* @param info connection parameters passed into a driver.
*
* @throws FBResourceException if specified mapping is incorrect.
*/
public static void processTpbMapping(GDS gds,
FirebirdConnectionProperties connectionProperties, Properties info)
throws FBResourceException {
if (info.containsKey(TRANSACTION_SERIALIZABLE))
connectionProperties.setTransactionParameters(
Connection.TRANSACTION_SERIALIZABLE,
FBTpbMapper.processMapping(gds,
info.getProperty(TRANSACTION_SERIALIZABLE)));
if (info.containsKey(TRANSACTION_REPEATABLE_READ))
connectionProperties.setTransactionParameters(
Connection.TRANSACTION_REPEATABLE_READ,
FBTpbMapper.processMapping(gds,
info.getProperty(TRANSACTION_REPEATABLE_READ)));
if (info.containsKey(TRANSACTION_READ_COMMITTED))
connectionProperties.setTransactionParameters(
Connection.TRANSACTION_READ_COMMITTED,
FBTpbMapper.processMapping(gds,
info.getProperty(TRANSACTION_READ_COMMITTED)));
}
/**
* Get value of TPB parameter for the specified name. This method tries to
* match string representation of the TPB parameter with its value.
*
* @param name string representation of TPB parameter, can have "isc_tpb_"
* prefix.
*
* @return value corresponding to the specified parameter name or null if
* nothing was found.
*/
public static Integer getTpbParam(String name) {
return (Integer)tpbTypes.get(name);
}
/**
* Load properties from the specified resource. This method uses the same
* class loader that loaded this class.
*
* @param resource path to the resource relative to the root of the
* classloader.
*
* @return instance of {@link Properties} containing loaded resources or
* null if resource was not found.
*
* @throws IOException if I/O error occured.
*/
private static Properties loadProperties(String resource) throws IOException {
ClassLoader cl = FBConnectionHelper.class.getClassLoader();
InputStream in = null;
// get the stream from the classloader or system classloader
if (cl == null)
in = ClassLoader.getSystemResourceAsStream(resource);
else
in = cl.getResourceAsStream(resource);
if (in == null)
return null;
try {
Properties props = new Properties();
props.load(in);
return props;
} finally {
in.close();
}
}
/**
* Load mapping between DPB key and their parameter types.
*/
private static void loadDpbParameterTypes() {
Properties props;
try {
props = loadProperties(ISC_DPB_TYPES_RESOURCE);
} catch(IOException ex) {
ex.printStackTrace();
return;
}
for (Iterator iter = props.entrySet().iterator(); iter.hasNext();) {
Map.Entry entry = (Map.Entry) iter.next();
String key = (String)entry.getKey();
String shortKey = key.substring(DPB_PREFIX.length());
String value = (String)entry.getValue();
// Remove text intended as comment (which due to the properties format is part of the value)
int hashIndex = value.indexOf('#');
if (hashIndex != -1) {
value = value.substring(0, hashIndex).trim();
}
if ("boolean".equals(value)) {
dpbParameterTypes.put(key, new Integer(TYPE_BOOLEAN));
dpbParameterTypes.put(shortKey, new Integer(TYPE_BOOLEAN));
} else
if ("byte".equals(value)) {
dpbParameterTypes.put(key, new Integer(TYPE_BYTE));
dpbParameterTypes.put(shortKey, new Integer(TYPE_BYTE));
} else
if ("int".equals(value)) {
dpbParameterTypes.put(key, new Integer(TYPE_INT));
dpbParameterTypes.put(shortKey, new Integer(TYPE_INT));
} else
if ("string".equals(value)) {
dpbParameterTypes.put(key, new Integer(TYPE_STRING));
dpbParameterTypes.put(shortKey, new Integer(TYPE_STRING));
} else
continue;
}
}
}
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