001: /*
002: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
003: *
004: * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
005: *
006: * The contents of this file are subject to the terms of either the GNU
007: * General Public License Version 2 only ("GPL") or the Common
008: * Development and Distribution License("CDDL") (collectively, the
009: * "License"). You may not use this file except in compliance with the
010: * License. You can obtain a copy of the License at
011: * http://www.netbeans.org/cddl-gplv2.html
012: * or nbbuild/licenses/CDDL-GPL-2-CP. See the License for the
013: * specific language governing permissions and limitations under the
014: * License. When distributing the software, include this License Header
015: * Notice in each file and include the License file at
016: * nbbuild/licenses/CDDL-GPL-2-CP. Sun designates this
017: * particular file as subject to the "Classpath" exception as provided
018: * by Sun in the GPL Version 2 section of the License file that
019: * accompanied this code. If applicable, add the following below the
020: * License Header, with the fields enclosed by brackets [] replaced by
021: * your own identifying information:
022: * "Portions Copyrighted [year] [name of copyright owner]"
023: *
024: * Contributor(s):
025: *
026: * The Original Software is NetBeans. The Initial Developer of the Original
027: * Software is Sun Microsystems, Inc. Portions Copyright 1997-2007 Sun
028: * Microsystems, Inc. All Rights Reserved.
029: *
030: * If you wish your version of this file to be governed by only the CDDL
031: * or only the GPL Version 2, indicate your decision by adding
032: * "[Contributor] elects to include this software in this distribution
033: * under the [CDDL or GPL Version 2] license." If you do not indicate a
034: * single choice of license, a recipient has the option to distribute
035: * your version of this file under either the CDDL, the GPL Version 2 or
036: * to extend the choice of license to its licensees as provided above.
037: * However, if you add GPL Version 2 code and therefore, elected the GPL
038: * Version 2 license, then the option applies only if the new code is
039: * made subject to such option by the copyright holder.
040: */
041:
042: package com.sun.data.provider.impl;
043:
044: import java.io.File;
045: import java.io.FileOutputStream;
046: import java.io.IOException;
047: import java.io.ObjectOutputStream;
048: import java.sql.ResultSetMetaData;
049: import java.util.logging.Level;
050: import java.util.logging.Logger;
051:
052: /**
053: *
054: * @author JohnBaker
055: */
056: public class MetaDataSerializer {
057: private static Logger LOGGER = Logger
058: .getLogger(CachedRowSetDataProvider.class.getName());
059:
060: /**
061: * Creates a new folder in the userdir and if needed and generates a new serialized filename
062: * @param serFileName name of file used to generate an absolute filename
063: * @return an absolute filename
064: */
065: public String generateMetaDataName(String serFileName) {
066: File cachedMetadataUserdirFolder = new File(System
067: .getProperty("netbeans.user")
068: + File.separator
069: + "config"
070: + File.separator
071: + "Databases" + File.separator + "CachedMetadata"); // NOI18N
072: if (!cachedMetadataUserdirFolder.exists()) {
073: cachedMetadataUserdirFolder.mkdir();
074: }
075:
076: return cachedMetadataUserdirFolder + File.separator
077: + serFileName + ".ser"; // NOI18N
078: }
079:
080: /**
081: * Checks if file containing a serialized object exists
082: * @param mdFileName absolute filename
083: * @return
084: */
085: public boolean mdFileNameExists(String mdFileName) {
086: return new File(mdFileName).exists();
087: }
088:
089: /**
090: * Serializes an instance of ResultSetMetaData and writes the object to a file
091: * @param resultSetMetaData metadata to serialized
092: * @param mdFileName absolute filename
093: */
094: public void serialize(ResultSetMetaData resultSetMetaData,
095: String mdFileName) {
096:
097: if (resultSetMetaData != null) {
098: ObjectOutputStream os = null;
099: try {
100: os = new ObjectOutputStream(new FileOutputStream(
101: mdFileName));
102: os.writeObject(resultSetMetaData);
103: } catch (IOException ex) {
104: ex.printStackTrace();
105: } finally {
106: try {
107: // if new FileOutputStream(mdFileName) is null (due to FileNotFoundException) then os would be null and no stream would be opened for writing
108: if (os != null) {
109: os.close();
110: }
111: } catch (IOException ex) {
112: ex.printStackTrace();
113: }
114: }
115: }
116:
117: }
118: }
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