/*
* Copyright (C) 2009 Muthu Ramadoss. All rights reserved.
*
* Modified from Apache Commons IO project to suit Books-Exchange requirements.
* Original source from Apache Commons IO - http://commons.apache.org/
*/
/*
* 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.
*/
package com.griffingroup.mevents;
import java.io.*;
public final class IOUtils {
/**
* The default buffer size to use.
*/
private static final int DEFAULT_BUFFER_SIZE = 1024 * 4;
/**
* Get the contents of an <code>InputStream</code> as a String using the
* specified character encoding.
* <p/>
* Character encoding names can be found at <a
* href="http://www.iana.org/assignments/character-sets">IANA</a>.
* <p/>
* This method buffers the input internally, so there is no need to use a
* <code>BufferedInputStream</code>.
*
* @param input the <code>InputStream</code> to read from
* @param encoding the encoding to use, null means platform default
* @return the requested String
* @throws NullPointerException if the input is null
* @throws java.io.IOException if an I/O error occurs
*/
public static String toString(InputStream input, String encoding)
throws IOException {
StringWriter sw = new StringWriter();
copy(input, sw, encoding);
return sw.toString();
}
/**
* Copy bytes from an <code>InputStream</code> to chars on a
* <code>Writer</code> using the specified character encoding.
* <p/>
* This method buffers the input internally, so there is no need to use a
* <code>BufferedInputStream</code>.
* <p/>
* Character encoding names can be found at <a
* href="http://www.iana.org/assignments/character-sets">IANA</a>.
* <p/>
* This method uses {@link java.io.InputStreamReader}.
*
* @param input the <code>InputStream</code> to read from
* @param output the <code>Writer</code> to write to
* @param encoding the encoding to use, null means platform default
* @throws NullPointerException if the input or output is null
* @throws java.io.IOException if an I/O error occurs
* @since Commons IO 1.1
*/
public static void copy(InputStream input, Writer output, String encoding)
throws IOException {
if (encoding == null) {
copy(input, output);
} else {
InputStreamReader in = new InputStreamReader(input, encoding);
copy(in, output);
}
}
/**
* Copy bytes from an <code>InputStream</code> to chars on a
* <code>Writer</code> using the default character encoding of the platform.
* <p/>
* This method buffers the input internally, so there is no need to use a
* <code>BufferedInputStream</code>.
* <p/>
* This method uses {@link java.io.InputStreamReader}.
*
* @param input the <code>InputStream</code> to read from
* @param output the <code>Writer</code> to write to
* @throws NullPointerException if the input or output is null
* @throws java.io.IOException if an I/O error occurs
* @since Commons IO 1.1
*/
public static void copy(InputStream input, Writer output)
throws IOException {
InputStreamReader in = new InputStreamReader(input);
copy(in, output);
}
// copy from Reader
// -----------------------------------------------------------------------
/**
* Copy chars from a <code>Reader</code> to a <code>Writer</code>.
* <p/>
* This method buffers the input internally, so there is no need to use a
* <code>BufferedReader</code>.
* <p/>
* Large streams (over 2GB) will return a chars copied value of
* <code>-1</code> after the copy has completed since the correct number of
* chars cannot be returned as an int. For large streams use the
* <code>copyLarge(Reader, Writer)</code> method.
*
* @param input the <code>Reader</code> to read from
* @param output the <code>Writer</code> to write to
* @return the number of characters copied
* @throws NullPointerException if the input or output is null
* @throws java.io.IOException if an I/O error occurs
* @throws ArithmeticException if the character count is too large
* @since Commons IO 1.1
*/
public static int copy(Reader input, Writer output) throws IOException {
long count = copyLarge(input, output);
if (count > Integer.MAX_VALUE) {
return -1;
}
return (int) count;
}
/**
* Copy chars from a large (over 2GB) <code>Reader</code> to a
* <code>Writer</code>.
* <p/>
* This method buffers the input internally, so there is no need to use a
* <code>BufferedReader</code>.
*
* @param input the <code>Reader</code> to read from
* @param output the <code>Writer</code> to write to
* @return the number of characters copied
* @throws NullPointerException if the input or output is null
* @throws java.io.IOException if an I/O error occurs
* @since Commons IO 1.3
*/
public static long copyLarge(Reader input, Writer output)
throws IOException {
char[] buffer = new char[DEFAULT_BUFFER_SIZE];
long count = 0;
int n = 0;
while (-1 != (n = input.read(buffer))) {
output.write(buffer, 0, n);
count += n;
}
return count;
}
}