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/*
* 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.blade.web.multipart;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
/**
* Utility class for working with streams.
*/
public final class Streams {
/**
* Private constructor, to prevent instantiation. This class has only static methods.
*/
private Streams() {
// does nothing
}
/**
* Default buffer size for use in {@link #copy(InputStream, OutputStream, boolean)}.
*/
private static final int DEFAULT_BUFFER_SIZE = 8192;
/**
* Copies the contents of the given {@link InputStream} to the given {@link OutputStream}. Shortcut for
*
*
copy(pInputStream, pOutputStream, new byte[8192]);
*
* @param pInputStream The input stream, which is being read. It is guaranteed, that {@link InputStream#close()} is
* called on the stream.
* @param pOutputStream The output stream, to which data should be written. May be null, in which case the input
* streams contents are simply discarded.
* @param pClose True guarantees, that {@link OutputStream#close()} is called on the stream. False indicates, that
* only {@link OutputStream#flush()} should be called finally.
*
* @return Number of bytes, which have been copied.
* @throws IOException An I/O error occurred.
*/
public static long copy(InputStream pInputStream, OutputStream pOutputStream, boolean pClose) throws IOException {
return copy(pInputStream, pOutputStream, pClose, new byte[DEFAULT_BUFFER_SIZE]);
}
/**
* Copies the contents of the given {@link InputStream} to the given {@link OutputStream}.
*
* @param pIn The input stream, which is being read. It is guaranteed, that {@link InputStream#close()} is called on
* the stream.
* @param pOut The output stream, to which data should be written. May be null, in which case the input streams
* contents are simply discarded.
* @param pClose True guarantees, that {@link OutputStream#close()} is called on the stream. False indicates, that
* only {@link OutputStream#flush()} should be called finally.
* @param pBuffer Temporary buffer, which is to be used for copying data.
*
* @return Number of bytes, which have been copied.
* @throws IOException An I/O error occurred.
*/
public static long copy(InputStream pIn, OutputStream pOut, boolean pClose, byte[] pBuffer) throws IOException {
OutputStream out = pOut;
InputStream in = pIn;
try {
long total = 0;
for (;;) {
int res = in.read(pBuffer);
if (res == -1) {
break;
}
if (res > 0) {
total += res;
if (out != null) {
out.write(pBuffer, 0, res);
}
}
}
if (out != null) {
if (pClose) {
out.close();
} else {
out.flush();
}
out = null;
}
in.close();
in = null;
return total;
} finally {
if (in != null) {
try {
in.close();
} catch (Throwable t) {
/* Ignore me */
}
}
if (pClose && out != null) {
try {
out.close();
} catch (Throwable t) {
/* ignore me */
}
}
}
}
/**
* This convenience method allows to read a org.apache.commons.fileupload.FileItemStream's content into a
* string. The platform's default character encoding is used for converting bytes into characters.
*
* @param pStream The input stream to read.
* @see #asString(InputStream, String)
*
* @return The streams contents, as a string.
* @throws IOException An I/O error occurred.
*/
public static String asString(InputStream pStream) throws IOException {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
copy(pStream, baos, true);
return baos.toString();
}
/**
* This convenience method allows to read a org.apache.commons.fileupload.FileItemStream's content into a
* string, using the given character encoding.
*
* @param pStream The input stream to read.
* @param pEncoding The character encoding, typically "UTF-8".
* @see #asString(InputStream)
*
* @return The streams contents, as a string.
* @throws IOException An I/O error occurred.
*/
public static String asString(InputStream pStream, String pEncoding) throws IOException {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
copy(pStream, baos, true);
return baos.toString(pEncoding);
}
}
