001/*
002 * #%L
003 * Netarchivesuite - common - test
004 * %%
005 * Copyright (C) 2005 - 2014 The Royal Danish Library, the Danish State and University Library,
006 *             the National Library of France and the Austrian National Library.
007 * %%
008 * This program is free software: you can redistribute it and/or modify
009 * it under the terms of the GNU Lesser General Public License as
010 * published by the Free Software Foundation, either version 2.1 of the
011 * License, or (at your option) any later version.
012 * 
013 * This program is distributed in the hope that it will be useful,
014 * but WITHOUT ANY WARRANTY; without even the implied warranty of
015 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
016 * GNU General Lesser Public License for more details.
017 * 
018 * You should have received a copy of the GNU General Lesser Public
019 * License along with this program.  If not, see
020 * <http://www.gnu.org/licenses/lgpl-2.1.html>.
021 * #L%
022 */
023package dk.netarkivet.testutils.preconfigured;
024
025import java.io.ByteArrayOutputStream;
026import java.io.InputStream;
027import java.io.PrintStream;
028
029import dk.netarkivet.common.exceptions.PermissionDenied;
030
031public class PreserveStdStreams implements TestConfigurationIF {
032    private InputStream origStdIn;
033    private PrintStream origStdOut;
034    private PrintStream origStdErr;
035    private ByteArrayOutputStream myOut;
036    private ByteArrayOutputStream myErr;
037    private boolean overwrite;
038
039    public PreserveStdStreams(boolean andOverwrite) {
040        overwrite = andOverwrite;
041    }
042
043    public PreserveStdStreams() {
044        this(false);
045    }
046
047    public void setUp() {
048        origStdIn = System.in;
049        origStdOut = System.out;
050        origStdErr = System.err;
051        if (overwrite) {
052            myOut = new ByteArrayOutputStream();
053            System.setOut(new PrintStream(myOut));
054        }
055        if (overwrite) {
056            myErr = new ByteArrayOutputStream();
057            System.setErr(new PrintStream(myErr));
058        }
059    }
060
061    public void tearDown() {
062        System.setIn(origStdIn);
063        System.setOut(origStdOut);
064        System.setErr(origStdErr);
065    }
066
067    public String getOut() {
068        if (overwrite) {
069            return myOut.toString();
070        }
071        throw new PermissionDenied("Set overwrite to true to use this facility");
072    }
073
074    public String getErr() {
075        if (overwrite) {
076            return myErr.toString();
077        }
078        throw new PermissionDenied("Set overwrite to true to use this facility");
079    }
080}