/*
* Copyright 2000-2014 JetBrains s.r.o.
*
* 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 com.intellij.util.io;
import com.intellij.openapi.progress.ProgressIndicator;
import org.jetbrains.annotations.NotNull;
import java.io.IOException;
import java.io.InputStream;
final class ProgressMonitorInputStream extends InputStream {
private final ProgressIndicator indicator;
private final InputStream in;
private double available;
private long count;
public ProgressMonitorInputStream(@NotNull ProgressIndicator indicator, @NotNull InputStream in, int length) {
this.indicator = indicator;
this.in = in;
available = length;
}
@Override
public int read() throws IOException {
int c = in.read();
updateProgress(c >= 0 ? 1 : 0);
return c;
}
private void updateProgress(long increment) {
indicator.checkCanceled();
if (increment > 0) {
count += increment;
indicator.setFraction((double)count / available);
}
}
@Override
public int read(byte[] b) throws IOException {
int r = in.read(b);
updateProgress(r);
return r;
}
@Override
public int read(byte[] b, int off, int len) throws IOException {
int r = in.read(b, off, len);
updateProgress(r);
return r;
}
@Override
public long skip(long n) throws IOException {
long r = in.skip(n);
updateProgress(r);
return r;
}
@Override
public void close() throws IOException {
in.close();
}
@Override
public int available() throws IOException {
return in.available();
}
}