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*/
package com.codename1.builders.util;
import java.io.*;
/**
*
* @author shannah
*/
public class Util {
/**
* Copy the input stream into the output stream, closes both streams when finishing or in
* a case of an exception
*
* @param i source
* @param o destination
*/
public static void copy(InputStream i, OutputStream o) throws IOException {
copy(i, o, 8192);
}
/**
* Copy the input stream into the output stream, without closing the streams when done
*
* @param i source
* @param o destination
* @param bufferSize the size of the buffer, which should be a power of 2 large enough
*/
public static void copyNoClose(InputStream i, OutputStream o, int bufferSize) throws IOException {
copyNoClose(i, o, bufferSize, null);
}
/**
* Copy the input stream into the output stream, without closing the streams when done
*
* @param i source
* @param o destination
* @param bufferSize the size of the buffer, which should be a power of 2 large enough
* @param callback called after each copy step
*/
public static void copyNoClose(InputStream i, OutputStream o, int bufferSize, IOProgressListener callback) throws IOException {
byte[] buffer = new byte[bufferSize];
int size = i.read(buffer);
int total = 0;
while(size > -1) {
o.write(buffer, 0, size);
if(callback != null) {
callback.ioStreamUpdate(i, total += size);
}
size = i.read(buffer);
}
}
/**
* Copy the input stream into the output stream, closes both streams when finishing or in
* a case of an exception
*
* @param i source
* @param o destination
* @param bufferSize the size of the buffer, which should be a power of 2 large enough
*/
public static void copy(InputStream i, OutputStream o, int bufferSize) throws IOException {
try {
copyNoClose(i, o, bufferSize);
} finally {
cleanup(o);
cleanup(i);
}
}
/**
* Closes the object (connection, stream etc.) without throwing any exception, even if the
* object is null
*
* @param o Connection, Stream or other closeable object
*/
public static void cleanup(Object o) {
try {
if(o != null) {
if(o instanceof InputStream) {
((InputStream) o).close();
return;
}
if(o instanceof OutputStream) {
((OutputStream) o).close();
return;
}
if(o instanceof Reader) {
((Reader) o).close();
return;
}
if(o instanceof Writer) {
((Writer) o).close();
return;
}
if (o instanceof Closeable) {
((Closeable)o).close();
return;
}
}
} catch (Throwable ex) {
ex.printStackTrace();
}
}
/**
* Reads an input stream to a string
*
* @param i the input stream
* @return a UTF-8 string
* @throws IOException thrown by the stream
*/
public static String readToString(InputStream i) throws IOException {
return readToString(i, "UTF-8");
}
/**
* Reads an input stream to a string
*
* @param i the input stream
* @param encoding the encoding of the stream
* @return a string
* @throws IOException thrown by the stream
*/
public static String readToString(InputStream i, String encoding) throws IOException {
byte[] b = readInputStream(i);
return new String(b, 0, b.length, encoding);
}
/**
* Reads a reader to a string
*
* @param i the input stream
* @param encoding the encoding of the stream
* @return a string
* @throws IOException thrown by the stream
* @since 7.0
*/
public static String readToString(Reader reader) throws IOException {
StringBuilder sb = new StringBuilder();
char[] buf = new char[1024];
int len;
while ((len = reader.read(buf)) != -1) {
sb.append(buf, 0, len);
}
return sb.toString();
}
/**
* Converts a small input stream to a byte array
*
* @param i the stream to convert
* @return byte array of the content of the stream
*/
public static byte[] readInputStream(InputStream i) throws IOException {
ByteArrayOutputStream b = new ByteArrayOutputStream();
copy(i, b);
return b.toByteArray();
}
}
