/*
 * Copyright 2012 the original author or authors.
 *
 * Licensed 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 org.gradle.util;

import org.gradle.internal.UncheckedException;
import org.gradle.internal.concurrent.CompositeStoppable;
import org.junit.rules.TestRule;
import org.junit.runner.Description;
import org.junit.runners.model.Statement;

import java.io.IOException;
import java.io.InputStream;
import java.io.PipedInputStream;
import java.io.PipedOutputStream;

/**
 * A Junit rule which restores System.in at the end of the test.
 *
 * Provides a pipe for providing input to System.in in the tests
 */
public class RedirectStdIn implements TestRule {
    private final PipedInputStream emulatedSystemIn = new PipedInputStream();
    private PipedOutputStream stdinPipe;

    @Override
    public Statement apply(final Statement base, Description description) {
        return new Statement() {
            @Override
            public void evaluate() throws Throwable {
                final InputStream originalStdIn = System.in;
                initPipe();
                System.setIn(emulatedSystemIn);
                try {
                    base.evaluate();
                } finally {
                    System.setIn(originalStdIn);
                    CompositeStoppable.stoppable(stdinPipe, emulatedSystemIn).stop();
                }
            }
        };
    }

    public PipedOutputStream getStdinPipe() {
        initPipe();
        return stdinPipe;
    }

    private void initPipe() {
        if (stdinPipe == null) {
            try {
                stdinPipe = new PipedOutputStream(emulatedSystemIn);
            } catch (IOException e) {
                throw UncheckedException.throwAsUncheckedException(e);
            }
        }
    }
}

@@ -1180,22 +1180,16 @@
 private 
-final 
 PipedInp
@@ -1236,24 +1236,24 @@
 utStream();%0A
+
     private 
@@ -1778,70 +1778,17 @@
     
-CompositeStoppable.stoppable(stdinPipe, emulatedSystemIn).stop
+closePipe
 ();%0A
@@ -1995,24 +1995,79 @@
  == null) %7B%0A
+            emulatedSystemIn = new PipedInputStream();%0A
             
@@ -2256,32 +2256,32 @@
 ;%0A            %7D%0A
-
         %7D%0A    %7D%0A
@@ -2279,11 +2279,305 @@
  %7D%0A    %7D
+%0A%0A    public void resetStdinPipe() %7B%0A        closePipe();%0A        initPipe();%0A        System.setIn(emulatedSystemIn);%0A    %7D%0A%0A    private void closePipe() %7B%0A        CompositeStoppable.stoppable(stdinPipe, emulatedSystemIn).stop();%0A        stdinPipe = null;%0A        emulatedSystemIn = null;%0A    %7D
 %0A%7D%0A

add resetting feature to RedirectStdIn - allows resetting the stdin pipe after it has been closed