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115 lines
3.6 KiB
115 lines
3.6 KiB
// LowLevelTools.java
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// (C) 2008 by Daniel Raap; danielr@users.berlios.de
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// first published 2.4.2008 on http://yacy.net
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//
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// This is a part of YaCy, a peer-to-peer based web search engine
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//
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// $LastChangedDate: 2008-03-14 01:16:04 +0100 (Fr, 14 Mrz 2008) $
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// $LastChangedRevision: 4558 $
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// $LastChangedBy: orbiter $
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//
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// LICENSE
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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package de.anomic.tools;
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import java.io.BufferedInputStream;
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import java.io.BufferedOutputStream;
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import java.io.BufferedReader;
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import java.io.BufferedWriter;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.InputStreamReader;
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import java.io.OutputStream;
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import java.io.Writer;
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/**
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* @author danielr
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*
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*/
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public class StreamTools {
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/**
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* copies the input stream to all output streams (byte per byte)
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* @param in
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* @param outs
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* @return
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* @throws IOException
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*/
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public static int copyToStreams(InputStream in, final OutputStream[] outs) throws IOException {
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if(!(in instanceof BufferedInputStream)) {
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// add buffer
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in = new BufferedInputStream(in);
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}
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// check if buffer is used
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int i = 0;
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for(final OutputStream output: outs) {
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if (!(output instanceof BufferedOutputStream)) {
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// add buffer
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outs[i] = new BufferedOutputStream(output);
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}
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i++;
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}
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int count = 0;
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// copy bytes
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int b;
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while((b = in.read()) != -1) {
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count++;
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for(final OutputStream out: outs) {
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out.write(b);
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}
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}
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return count;
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}
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/**
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* copies the input stream to all writers (byte per byte)
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* @param data
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* @param writers
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* @param charSet
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* @return
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* @throws IOException
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*/
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public static int copyToWriters(final InputStream data, final Writer[] writers, final String charSet) throws IOException {
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// the docs say: "For top efficiency, consider wrapping an InputStreamReader within a BufferedReader."
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final BufferedReader sourceReader = new BufferedReader(new InputStreamReader(data, charSet));
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// check if buffer is used. From the documentation:
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// "For top efficiency, consider wrapping an OutputStreamWriter within a BufferedWriter so as to avoid frequent
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// converter invocations"
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int i = 0;
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for(final Writer writer: writers) {
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if (!(writer instanceof BufferedWriter)) {
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// add buffer
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writers[i] = new BufferedWriter(writer);
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}
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i++;
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}
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int count = 0;
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// copy bytes
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int b;
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while((b = sourceReader.read()) != -1) {
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count++;
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for(final Writer writer: writers) {
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writer.write(b);
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}
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}
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return count;
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}
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}
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