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/*
* @(#)RAFFileFactory.java 1.27 06/10/30
*
* Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Sun designates this
* particular file as subject to the "Classpath" exception as provided
* by Sun in the LICENSE file that accompanied this code.
*
* This code 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
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.com if you need additional information or
* have any questions.
*/
/*
* @(#) RAFFileFactory.java 1.27 - last change made 10/30/06
*/
package com.sun.java.help.search;
import java.io.*;
import java.net.*;
import java.util.*;
import java.lang.reflect.*;
/**
* A factory for files that can be accessed as Random Access file from a URL.
* RAFFiles can either be an acutall RAF file or a memory version of the
* RAF file. When a URL is it is opened as a RAF file, otherwise it is moved
* to a temporary file if possible or into a memory resident version.
*
*
* @author Roger D. Brinkley
* @version 1.27 10/30/06
*/
class RAFFileFactory {
/**
* Cannot create these, need to go through the factory method
*/
private RAFFileFactory() {
}
static RAFFileFactory theFactory;
public static synchronized RAFFileFactory create() {
if (theFactory == null) {
theFactory = new RAFFileFactory();
}
return theFactory;
}
/* For this connection, when to cache in memory and when to disk */
private int memoryCacheLimit = 10000;
private boolean isFileURL(URL url) {
return url.getProtocol().equalsIgnoreCase("file");
}
public int getMemoryCacheLimit() {
return memoryCacheLimit;
}
public void setMemoryCacheLimit(int limit) {
this.memoryCacheLimit = limit;
}
public synchronized RAFFile get(URL url, boolean update)
throws IOException {
RAFFile result = null;
if (isFileURL(url)) {
try {
String f = url.getFile();
// Normalize the string. This is required because of a
// backwards incompatability change in JDK 1.4.0 and later
// releases.
f = Utilities.URLDecoder(f);
// refactor so it runs with verification on...
// Object o = new FilePermission(f, update ? "write":"read");
// here -- check if AccessController.checkPermission(p);
result = new RAFFile(f, update);
debug ("Opened Dict file with file protocol:" + f);
} catch (SecurityException e) {
// cannot do "it" -- code is not yet in place
}
}
if (result == null) {
result = createLocalRAFFile(url);
}
if (result == null) {
throw new FileNotFoundException(url.toString());
}
return result;
}
/**
* Given a URL, retrieves a DICT file and creates a cached DICT
* file object. If the file is larger than the size limit,
* and if temp files are supported by the Java virtual machine,
* the DICT file is it is cached to disk. Otherwise the DICT file
* is cached in memory.
*/
private static RAFFile createLocalRAFFile(URL url) throws IOException {
RAFFile result = null;
URLConnection connection = url.openConnection();
// We should be able to just do a catch on missing method but
// IE4.0 does not like this
//
// try {
// Object foo = connection.getPermission();
//
// result = RAFFileFactoryOn12.get(connection);
//
// } catch (NoSuchMethodError ex) {
// // on 1.1 all we can do is create a memory file
// result = new MemoryRAFFile(connection);
// debug ("Opening a Dict file in Memory");
// }
//
try {
Class types[] = {};
Method m = URLConnection.class.getMethod("getPermission", types);
result = RAFFileFactoryOn12.get(connection);
} catch (NoSuchMethodError ex) {
// as in JDK1.1
} catch (NoSuchMethodException ex) {
// as in JDK1.1
}
if (result == null) {
// on 1.1 all we can do is create a memory file
result = new MemoryRAFFile(connection);
debug ("Opening a Dict file in Memory");
}
return result;
}
/**
* Debug code
*/
private static final boolean debug = false;
private static void debug(String msg) {
if (debug) {
System.err.println("RAFFileFactory: "+msg);
}
}
}
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