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Copy pathUtils.java
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Copy pathUtils.java
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executable file
·275 lines (238 loc) · 5.98 KB
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/*******************************************************************************
* Copyright 2009, Clark N. Hobbie
*
* This file is part of the CLIPC library.
*
* The CLIPC library is free software; you can redistribute it and/or modify it
* under the terms of the Lesser GNU General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or (at
* your option) any later version.
*
* The CLIPC library 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 Lesser GNU General Public
* License for more details.
*
* You should have received a copy of the Lesser GNU General Public License
* along with the CLIP library; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*******************************************************************************/
package com.lts.ipc;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.Reader;
import java.io.StringWriter;
/**
* An internal class that provides utility methods common to IPC classes.
*
* @author cnh
*/
public class Utils
{
/**
* Create a file if it does not already exist.
* <P>
* The IPC classes in this package all expect a file to exist that corresponds to the
* resource that they are manipulating. This method checks to see if the corresponding
* file does indeed exist on the underlying system. If it does not, then the method
* will try to create it.
*
* @param name
* The absolute path to the file.
* @throws IPCException
* If the method tries to create the file but an exception is thrown. The
* message will be set to {@link Messages#ERROR_CREATE_EXCEPTION} and the
* cause will be set to the offending exception.
*/
public static void checkFile (File f) throws IPCException
{
IOException problem = null;
if (!f.exists())
{
try
{
//
// According to the javadoc, if java.lang.File.createNewFile returns
// normally, then the specified file now exists --- it was created by
// the method or someone else created it just before we made the call.
// The only other possibility is an exception.
//
f.createNewFile();
}
catch (IOException e)
{
throw new IPCException(Messages.ERROR_CREATE_EXCEPTION, problem);
}
}
}
public static void checkFile (String name) throws IPCException
{
File file = new File(name);
checkFile(file);
}
public static long toMilliseconds (long seconds, long nanos)
{
long result = seconds * 1000;
result += nanos / 1000000;
long temp = nanos % 1000000;
if (temp > 0)
result++;
return result;
}
public static long toNanoseconds (long sec, long nanos)
{
long result = nanos;
result = result + 1000000000 * sec;
return result;
}
public static void closeNoExceptions(Reader reader)
{
if (null == reader)
return;
try
{
reader.close();
}
catch (IOException e)
{
; // ignore exceptions
}
}
public static void closeNoExceptions(BufferedReader reader)
{
if (null == reader)
return;
try
{
reader.close();
}
catch (IOException e)
{
; // this method is supposed to ignore exceptions
}
}
public static void closeNoExceptions(InputStream istream)
{
if (null == istream)
return;
try
{
istream.close();
}
catch (IOException e)
{
; // this method is supposed to ignore exceptions
}
}
public static String readFile(String name) throws IOException
{
FileReader reader = null;
try
{
reader = new FileReader(name);
StringWriter sw = new StringWriter(1024);
for (int c = reader.read(); c != -1; c = reader.read())
{
sw.write(c);
}
return sw.toString();
}
catch (FileNotFoundException e)
{
return null;
}
finally
{
Utils.closeNoExceptions(reader);
}
}
public static void writeFile(String name, String contents) throws IOException
{
FileWriter writer = null;
try
{
writer = new FileWriter(name);
writer.write(contents);
}
finally
{
Utils.closeNoExceptions(writer);
}
}
public static void closeNoExceptions(FileWriter writer)
{
if (null == writer)
return;
try
{
writer.close();
}
catch (IOException e)
{
; // the point of this method is to avoid throwing exceptions
}
}
/**
* Find the enum tag that matches a string without regards to case.
*
* <P>
* This method is intended to be used like so:
* </P>
*
* <P>
* <CODE>
* <PRE>
* enum Foo {
* One,Two,Three,Four;
* public static Foo toValueIgnoreCase(String s) {
* return (Foo) Utils.toValueIgnoreCase(Foo.values(), s);
* }
* }
* </PRE>
* </CODE>
* </P>
*
*
* @param values The enum tag values.
* @param s The string we are trying to convert.
* @return The matching enum tag.
* @throws RuntimeException If there is no match.
*/
public static Object toValueIgnoreCase(Object[] values, String s)
{
Object result = matchIgnoreCase(values, s);
if (null == result)
{
String msg = s + " does not matching any tag name";
throw new RuntimeException(msg);
}
return result;
}
public static Object matchIgnoreCase(Object[] values, String s)
{
for (Object tag : values)
{
if (s.equalsIgnoreCase(tag.toString()))
return tag;
}
return null;
}
public static void closeNoExceptions(OutputStream ostream)
{
try
{
ostream.close();
}
catch (IOException e)
{
;
}
}
}