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/*
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can obtain
* a copy of the License at https://jersey.dev.java.net/CDDL+GPL.html
* or jersey/legal/LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
*
* When distributing the software, include this License Header Notice in each
* file and include the License file at jersey/legal/LICENSE.txt.
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* as provided by Sun in the GPL Version 2 section of the License file that
* accompanied this code. If applicable, add the following below the License
* Header, with the fields enclosed by brackets [] replaced by your own
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*
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* and therefore, elected the GPL Version 2 license, then the option applies
* only if the new code is made subject to such option by the copyright
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*/
package com.sun.jersey.core.util;
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 javax.ws.rs.core.MediaType;
/**
* A utlity 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 {@link #DEFAULT_BUFFER_SIZE}. This value can
* be set using the system property {@link #BUFFER_SIZE_SYSTEM_PROPERTY}.
*
* @author [email protected]
*/
public final class ReaderWriter {
/**
* The UTF-8 Charset.
*/
public static final Charset UTF8 = Charset.forName("UTF-8");
/**
* The system property to set the default buffer size for arrays
* of byte and character.
*
* If the property value is not a positive integer then the default buffer
* size declared by {@link #DEFAULT_BUFFER_SIZE} will be utilized.
*/
public static final String BUFFER_SIZE_SYSTEM_PROPERTY =
"com.sun.jersey.core.util.ReaderWriter.BufferSize";
/**
* The default buffer size for arrays of byte and character.
*/
public static final int DEFAULT_BUFFER_SIZE = 8192;
/**
* The buffer size for arrays of byte and character.
*/
public static final int BUFFER_SIZE = getBufferSize();
private static int getBufferSize() {
String v = System.getProperty(
BUFFER_SIZE_SYSTEM_PROPERTY,
Integer.toString(DEFAULT_BUFFER_SIZE));
try {
int i = Integer.valueOf(v);
if (i <= 0)
throw new NumberFormatException();
return i;
} catch (NumberFormatException ex) {
return DEFAULT_BUFFER_SIZE;
}
}
/**
* Reader bytes from an input stream and write then 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 final 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);
}
/**
* Reader characters from an input stream and write then 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 final 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 final 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 final String readFromAsString(InputStream in,
MediaType type) throws IOException {
Reader reader = new InputStreamReader(in, getCharset(type));
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 final void writeToAsString(String s, OutputStream out,
MediaType type) throws IOException {
Writer osw = new BufferedWriter(new OutputStreamWriter(out,
getCharset(type)));
osw.write(s);
osw.flush();
}
}