/*
* Funambol is a mobile platform developed by Funambol, Inc.
* Copyright (C) 2003 - 2007 Funambol, Inc.
*
* This program is free software; you can redistribute it and/or modify it under
* the terms of the GNU Affero General Public License version 3 as published by
* the Free Software Foundation with the addition of the following permission
* added to Section 15 as permitted in Section 7(a): FOR ANY PART OF THE COVERED
* WORK IN WHICH THE COPYRIGHT IS OWNED BY FUNAMBOL, FUNAMBOL DISCLAIMS THE
* WARRANTY OF NON INFRINGEMENT OF THIRD PARTY RIGHTS.
*
* 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 GNU General Public License for more
* details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program; if not, see http://www.gnu.org/licenses or write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301 USA.
*
* You can contact Funambol, Inc. headquarters at 643 Bair Island Road, Suite
* 305, Redwood City, CA 94063, USA, or at email address info@funambol.com.
*
* The interactive user interfaces in modified source and object code versions
* of this program must display Appropriate Legal Notices, as required under
* Section 5 of the GNU Affero General Public License version 3.
*
* In accordance with Section 7(b) of the GNU Affero General Public License
* version 3, these Appropriate Legal Notices must retain the display of the
* "Powered by Funambol" logo. If the display of the logo is not reasonably
* feasible for technical reasons, the Appropriate Legal Notices must display
* the words "Powered by Funambol".
*/
package com.funambol.storage;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.Vector;
import java.io.IOException;
import java.io.OutputStream;
import java.io.InputStream;
import com.funambol.platform.FileAdapter;
import com.funambol.util.Log;
/**
*
*/
public class StringKeyValueFileStore implements StringKeyValueStore {
protected Hashtable store;
protected Vector pendingAdditions;
protected String fileName;
private static final int LF = 10;
private static final char SEPARATOR = '=';
private boolean updated = false;
private boolean appended = false;
public StringKeyValueFileStore(String fileName) {
store = new Hashtable();
pendingAdditions = new Vector();
this.fileName = fileName;
}
public void add(String key, String value) {
putInternal(key, value);
pendingAdditions.addElement(key);
appended = true;
}
public void update(String key, String value) {
putInternal(key, value);
updated = true;
}
public String put(String key, String value) {
updated = true;
return putInternal(key, value);
}
public String get(String key) {
String res = (String)store.get(key);
return res;
}
public Enumeration keys() {
return store.keys();
}
public Enumeration keyValuePairs() {
final Enumeration keys = store.keys();
final Enumeration values = store.elements();
return new Enumeration () {
boolean last = false;
public Object nextElement() {
String key = (String)keys.nextElement();
String value = (String)values.nextElement();
return new StringKeyValuePair(key, value);
}
public boolean hasMoreElements() {
return keys.hasMoreElements() && values.hasMoreElements();
}
};
}
public boolean contains(String key) {
return store.get(key) != null;
}
public String remove(String key) {
updated = true;
return (String)store.remove(key);
}
public void save() throws IOException {
if (!appended && !updated) {
return;
}
FileAdapter file = null;
OutputStream os = null;
// If there have been only additions, then we can append at the end of
// the file. Otherwise we rewrite completely
try {
file = new FileAdapter(fileName);
if (!updated) {
// Open in append mode
os = file.openOutputStream(true);
Enumeration keys = pendingAdditions.elements();
while(keys.hasMoreElements()) {
String key = (String)keys.nextElement();
String value = this.get(key);
os.write(key.getBytes());
os.write((int)SEPARATOR);
os.write(value.getBytes());
os.write((int)LF);
}
} else {
// Rewrite all the values
os = file.openOutputStream();
Enumeration keys = store.keys();
while(keys.hasMoreElements()) {
String key = (String)keys.nextElement();
String value = this.get(key);
os.write(key.getBytes());
os.write((int)SEPARATOR);
os.write(value.getBytes());
os.write((int)LF);
}
}
} finally {
if (os != null) {
try {
os.close();
} catch (IOException ioe) {
}
}
if (file != null) {
try {
file.close();
} catch (IOException ioe) {
}
}
// Reset all the meta information
pendingAdditions.removeAllElements();
appended = false;
updated = false;
}
}
public void load() throws IOException {
FileAdapter file = null;
InputStream is = null;
try {
file = new FileAdapter(fileName);
is = file.openInputStream();
StringBuffer currentLine = new StringBuffer();
for(long i=0, l=file.getSize(); i<l; ++i) {
char b = (char)is.read();
if (b == (char)LF) {
// This is the end of a line
String line = currentLine.toString().trim();
int pos = line.indexOf(SEPARATOR);
if (pos > 0) {
String key = line.substring(0, pos);
String value = line.substring(pos + 1, line.length());
this.put(key, value);
} else {
throw new IOException("Malformed String Store file");
}
currentLine = new StringBuffer();
} else {
currentLine.append((char)b);
}
}
} finally {
if (is != null) {
try {
is.close();
} catch (IOException ioe) {}
}
if (file != null) {
try {
file.close();
} catch (IOException ioe) {}
}
}
}
public void reset() throws IOException {
FileAdapter file = null;
OutputStream os = null;
try {
file = new FileAdapter(fileName);
os = file.openOutputStream();
} catch (Exception e) {
throw new IOException(e.toString());
} finally {
if (os != null) {
try {
os.close();
} catch (IOException ioe) {
}
}
if (file != null) {
try {
file.close();
} catch (IOException ioe) {
}
}
}
store = new Hashtable();
}
private String putInternal(String key, String value) {
return (String)store.put(key, value);
}
}