/*
* Copyright 2006 Ralf Joachim
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.castor.cpa.persistence.sql.connection;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.sql.CallableStatement;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.StringTokenizer;
import java.util.TreeSet;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
/**
* Proxy class for JDBC CallableStatement class, to allow information gathering
* for the purpose of SQL statement logging.
*
* @author <a href="mailto:ralf DOT joachim AT syscon DOT eu">Ralf Joachim</a>
* @version $Revision$ $Date$
* @since 1.0.4
*/
public final class CallableStatementProxy implements InvocationHandler {
//--------------------------------------------------------------------------
/** Jakarta Common Log instance. */
private static final Log LOG = LogFactory.getLog(CallableStatementProxy.class);
/** Set of setter methods that all have to be treated similare at invoke. */
private static final Set<String> SET_METHODS = new HashSet<String>(
Arrays.asList(new String[] {
"setArray", "setBigDecimal", "setBinaryStream", "setBlob", "setBoolean",
"setByte", "setBytes", "setCharacterStream", "setClob", "setDate",
"setDouble", "setFloat", "setInt", "setLong", "setObject", "setShort",
"setString", "setTime", "setTimestamp", "setURL"}));
/** CallableStatement to be proxied. */
private final CallableStatement _callableStatement;
/** The SQL statement to be executed. */
private String _sqlStatement;
/** SQL Parameter mapping. */
private final Map<Object, Object> _parameters = new HashMap<Object, Object>();
/** List of batch statements associated with this instance. */
private final List<String> _batchStatements = new ArrayList<String>();
//--------------------------------------------------------------------------
/**
* Creates an instance of this class.
*
* @param stmt Callable statement to be proxied.
* @param sql SQL string.
*/
protected CallableStatementProxy(final CallableStatement stmt, final String sql) {
_callableStatement = stmt;
_sqlStatement = sql;
if (LOG.isDebugEnabled()) {
LOG.debug("Creating callable statement proxy for SQL statement " + sql);
}
}
//--------------------------------------------------------------------------
/**
* {@inheritDoc}
*/
public Object invoke(final Object proxy, final Method method, final Object[] args)
throws Throwable {
String name = method.getName();
if ("clearBatch".equals(name)) {
_batchStatements.clear();
} else if ("clearParameters".equals(name)) {
_parameters.clear();
} else if ((args != null) && (args.length > 0)) {
if ("execute".equals(name)
|| "executeQuery".equals(name)
|| "executeUpdate".equals(name)) {
_sqlStatement = (String) args[0];
} else if ("addBatch".equals(name)) {
_batchStatements.add((String) args[0]);
} else if (args[0] instanceof Integer) {
if ("setNull".equals(name)) {
_parameters.put(args[0], "null");
} else if (SET_METHODS.contains(name)) {
_parameters.put(args[0], args[1]);
}
}
} else if ("toString".equals(name)) {
StringBuffer buffer = new StringBuffer();
StringTokenizer tokenizer = new StringTokenizer(_sqlStatement, "?");
Iterator<Object> iter = new TreeSet<Object>(_parameters.keySet()).iterator();
while (tokenizer.hasMoreTokens()) {
String partOfStatement = tokenizer.nextToken();
if (iter.hasNext()) {
buffer.append(partOfStatement);
buffer.append("'");
buffer.append(_parameters.get(iter.next()).toString());
buffer.append("'");
} else {
buffer.append(partOfStatement);
buffer.append("?");
}
}
return buffer.toString();
}
return method.invoke(_callableStatement, args);
}
//--------------------------------------------------------------------------
}