org.glassfish.jersey.message.internal.ReaderWriter Maven / Gradle / Ivy
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package org.glassfish.jersey.message.internal;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Reader;
import java.io.Writer;
import java.nio.charset.Charset;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.ws.rs.core.MediaType;
import org.glassfish.jersey.message.MessageProperties;
/**
* A utility class for reading and writing using byte and character streams.
*
* If a byte or character array is utilized then the size of the array
* is by default the value of {@value org.glassfish.jersey.message.MessageProperties#IO_DEFAULT_BUFFER_SIZE}.
* This value can be set using the system property
* {@value org.glassfish.jersey.message.MessageProperties#IO_BUFFER_SIZE}.
*
* @author Paul Sandoz
*/
public final class ReaderWriter {
private static final Logger LOGGER = Logger.getLogger(ReaderWriter.class.getName());
/**
* The UTF-8 Charset.
*/
public static final Charset UTF8 = Charset.forName("UTF-8");
/**
* The buffer size for arrays of byte and character.
*/
public static final int BUFFER_SIZE = getBufferSize();
private static int getBufferSize() {
final String value = System.getProperty(MessageProperties.IO_BUFFER_SIZE);
if (value != null) {
try {
final int i = Integer.parseInt(value);
if (i <= 0) {
throw new NumberFormatException("Value not positive.");
}
return i;
} catch (NumberFormatException e) {
LOGGER.log(Level.CONFIG,
"Value of " + MessageProperties.IO_BUFFER_SIZE
+ " property is not a valid positive integer [" + value + "]."
+ " Reverting to default [" + MessageProperties.IO_DEFAULT_BUFFER_SIZE + "].",
e);
}
}
return MessageProperties.IO_DEFAULT_BUFFER_SIZE;
}
/**
* Read bytes from an input stream and write them to an output stream.
*
* @param in the input stream to read from.
* @param out the output stream to write to.
* @throws IOException if there is an error reading or writing bytes.
*/
public static void writeTo(InputStream in, OutputStream out) throws IOException {
int read;
final byte[] data = new byte[BUFFER_SIZE];
while ((read = in.read(data)) != -1) {
out.write(data, 0, read);
}
}
/**
* Read characters from an input stream and write them to an output stream.
*
* @param in the reader to read from.
* @param out the writer to write to.
* @throws IOException if there is an error reading or writing characters.
*/
public static void writeTo(Reader in, Writer out) throws IOException {
int read;
final char[] data = new char[BUFFER_SIZE];
while ((read = in.read(data)) != -1) {
out.write(data, 0, read);
}
}
/**
* Get the character set from a media type.
*
* The character set is obtained from the media type parameter "charset".
* If the parameter is not present the {@link #UTF8} charset is utilized.
*
* @param m the media type.
* @return the character set.
*/
public static Charset getCharset(MediaType m) {
String name = (m == null) ? null : m.getParameters().get("charset");
return (name == null) ? UTF8 : Charset.forName(name);
}
/**
* Read the bytes of an input stream and convert to a string.
*
* @param in the input stream to read from.
* @param type the media type that determines the character set defining
* how to decode bytes to charaters.
* @return the string.
* @throws IOException if there is an error reading from the input stream.
*/
public static String readFromAsString(InputStream in,
MediaType type) throws IOException {
return readFromAsString(new InputStreamReader(in, getCharset(type)));
}
/**
* Read the characters of a reader and convert to a string.
*
* @param reader the reader
* @return the string
* @throws IOException if there is an error reading from the reader.
*/
public static String readFromAsString(Reader reader) throws IOException {
StringBuilder sb = new StringBuilder();
char[] c = new char[BUFFER_SIZE];
int l;
while ((l = reader.read(c)) != -1) {
sb.append(c, 0, l);
}
return sb.toString();
}
/**
* Convert a string to bytes and write those bytes to an output stream.
*
* @param s the string to convert to bytes.
* @param out the output stream to write to.
* @param type the media type that determines the character set defining
* how to decode bytes to characters.
* @throws IOException
*/
public static void writeToAsString(String s, OutputStream out,
MediaType type) throws IOException {
Writer osw = new BufferedWriter(new OutputStreamWriter(out,
getCharset(type)));
osw.write(s, 0, s.length()); // MUCH faster than BufferedWriter.write(s) on JDK 1.6
osw.flush();
}
/**
* Prevents instantiation.
*/
private ReaderWriter() {
}
}