de.intarsys.tools.stream.StreamTools Maven / Gradle / Ivy
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The basic runtime tools and interfaces for intarsys components.
/*
* Copyright (c) 2007, intarsys consulting GmbH
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* - Neither the name of intarsys nor the names of its contributors may be used
* to endorse or promote products derived from this software without specific
* prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
package de.intarsys.tools.stream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.RandomAccessFile;
import java.io.Reader;
import java.io.StringWriter;
import java.io.Writer;
import de.intarsys.tools.exception.ExceptionTools;
import de.intarsys.tools.randomaccess.IRandomAccess;
/**
* A tool class for the handling of streams.
*
*/
public class StreamTools {
//
public static final int MAX_BUFFER = 100000;
public static void close(InputStream is) {
try {
if (is != null) {
is.close();
}
} catch (IOException e) {
// ignore
}
}
public static void close(IRandomAccess ra) {
try {
if (ra != null) {
ra.close();
}
} catch (IOException e) {
// ignore
}
}
public static void close(OutputStream os) {
try {
if (os != null) {
os.close();
}
} catch (IOException e) {
// ignore
}
}
public static void close(RandomAccessFile ra) {
try {
if (ra != null) {
ra.close();
}
} catch (IOException e) {
// ignore
}
}
public static void close(Reader reader) {
try {
if (reader != null) {
reader.close();
}
} catch (IOException e) {
// ignore
}
}
public static void close(Writer writer) {
try {
if (writer != null) {
writer.close();
}
} catch (IOException e) {
// ignore
}
}
public static void copyEncoded(Reader reader, Writer writer)
throws IOException {
try {
char[] c = new char[MAX_BUFFER];
for (int i = reader.read(c); i != -1;) {
writer.write(c, 0, i);
i = reader.read(c);
}
} catch (IOException e) {
throw e;
} catch (Exception e) {
throw new IOException("copying failed (" + e.getMessage() + ")");
}
}
public static void copyEncodedStream(InputStream source,
String sourceEncoding, OutputStream destination,
String destinationEncoding) throws IOException {
if ((sourceEncoding == null) | (destinationEncoding == null)
| sourceEncoding.equals(destinationEncoding)) {
copyStream(source, false, destination, false);
}
InputStreamReader reader = null;
OutputStreamWriter writer = null;
try {
reader = new InputStreamReader(source, sourceEncoding);
writer = new OutputStreamWriter(destination, destinationEncoding);
char[] c = new char[MAX_BUFFER];
for (int i = reader.read(c); i != -1;) {
writer.write(c, 0, i);
i = reader.read(c);
}
} catch (IOException e) {
throw e;
} catch (Exception e) {
throw new IOException("copying failed (" + e.getMessage() + ")");
} finally {
/*
* do not close try { reader.close(); } catch (Exception ignore) { }
* try { writer.close(); } catch (Exception ignore) { }
*/
}
}
/**
* Kopiert einen Eingabedatenstrom auf einen Ausgabedatenstrom. Anschlie?end
* (finally) werden die Datenstr?me geschlossen(!), sofern dies in den
* Parametern angegeben wurde. Fehler beim Schlie?en der Datenstr?me werden
* ignoriert.
*
* @param source
* Eingabedatenstrom
* @param closeInput
* Angabe ob der InputStream nach dem Kopieren geschlossen werden
* soll.
* @param destination
* Ausgabedatenstrom
* @param closeOutput
* Angabe ob der OutputStream nach dem Kopieren geschlossen
* werden soll.
*
* @throws IOException
* Fehler allgemein oder beim Kopieren.
*/
public static void copyStream(InputStream source, boolean closeInput,
OutputStream destination, boolean closeOutput) throws IOException {
try {
byte[] b = new byte[MAX_BUFFER];
for (int i = source.read(b); i != -1;) {
destination.write(b, 0, i);
i = source.read(b);
}
} catch (IOException e) {
throw e;
} catch (Exception e) {
throw ExceptionTools.createIOException("copying failed ("
+ e.getMessage() + ")", e);
} finally {
if (closeInput) {
StreamTools.close(source);
}
if (closeOutput) {
StreamTools.close(destination);
}
}
}
/**
* Kopiert einen Stream. Ruft copyStream(in, true, out, true) auf.
*
* @see StreamTools#copyStream(InputStream, boolean, OutputStream, boolean)
*
* @param source
* Eingabedatenstrom, der kopiert werden soll.
* @param destination
* Ausgabestrom, auf den kopiert werden soll.
*
* @throws IOException
*
*/
public static void copyStream(InputStream source, OutputStream destination)
throws IOException {
copyStream(source, true, destination, true);
}
/**
* Kopiert einen Eingabedatenstrom auf einen Ausgabedatenstrom.
*
* @param source
* Eingabedatenstrom
* @param destination
* Ausgabedatenstrom
* @param length
* Anzahl der zu lesenden bytes
*
* @throws IOException
*
*/
public static void copyStream(InputStream source, OutputStream destination,
long length) throws IOException {
try {
long toRead = length;
byte[] b = new byte[(int) length];
while (toRead > 0) {
int i = source.read(b, 0, (int) toRead);
if (i == -1) {
break;
}
destination.write(b, 0, i);
toRead = toRead - i;
}
} catch (IOException e) {
throw e;
} catch (Exception e) {
throw new IOException("copying failed (" + e.getMessage() + ")");
}
}
public static byte[] toByteArray(InputStream is) throws IOException {
ByteArrayOutputStream os = new ByteArrayOutputStream();
copyStream(is, os);
return os.toByteArray();
}
public static String toString(InputStream is, String encoding)
throws IOException {
ByteArrayOutputStream os = new ByteArrayOutputStream();
copyStream(is, os);
if (encoding == null) {
encoding = System.getProperty("file.encoding");
}
return os.toString(encoding);
}
public static String toString(Reader r) throws IOException {
StringWriter w = new StringWriter();
copyEncoded(r, w);
return w.toString();
}
private StreamTools() {
super();
}
}
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