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Utility functions related to Streams
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.
*/
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Reader;
import java.io.Writer;
import java.io.InputStreamReader;
/**
* Utility functions related to Streams.
*
* @author <a href="mailto:taylor@apache.org">David Sean Taylor</a>
* @version $Id: Streams.java 516448 2007-03-09 16:25:47Z ate $
*/
public class Streams
{
static final int BLOCK_SIZE=4096;
public static void drain(InputStream r,OutputStream w) throws IOException
{
byte[] bytes=new byte[BLOCK_SIZE];
try
{
int length=r.read(bytes);
while(length!=-1)
{
if(length!=0)
{
w.write(bytes,0,length);
}
length=r.read(bytes);
}
}
finally
{
bytes=null;
}
}
public static void drain(Reader r,Writer w) throws IOException
{
char[] bytes=new char[BLOCK_SIZE];
try
{
int length=r.read(bytes);
while(length!=-1)
{
if(length!=0)
{
w.write(bytes,0,length);
}
length=r.read(bytes);
}
}
finally
{
bytes=null;
}
}
public static void drain(Reader r,OutputStream os) throws IOException
{
Writer w=new OutputStreamWriter(os);
drain(r,w);
w.flush();
}
public static void drain(InputStream is, Writer w) throws IOException
{
Reader r = new InputStreamReader(is);
drain(r,w);
w.flush();
}
public static byte[] drain(InputStream r) throws IOException
{
ByteArrayOutputStream bytes=new ByteArrayOutputStream();
drain(r,bytes);
return bytes.toByteArray();
}
public static String getAsString(InputStream is)
{
int c=0;
char lineBuffer[]=new char[128], buf[]=lineBuffer;
int room= buf.length, offset=0;
try
{
loop: while (true)
{
// read chars into a buffer which grows as needed
switch (c = is.read() )
{
case -1: break loop;
default: if (--room < 0)
{
buf = new char[offset + 128];
room = buf.length - offset - 1;
System.arraycopy(lineBuffer, 0,
buf, 0, offset);
lineBuffer = buf;
}
buf[offset++] = (char) c;
break;
}
}
}
catch(IOException ioe)
{
ioe.printStackTrace();
}
if ((c == -1) && (offset == 0))
{
return null;
}
return String.copyValueOf(buf, 0, offset);
}
}
