| /* |
| * Copyright 2000-2012 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 org.jetbrains.idea.svn.svnkit.lowLevel; |
| |
| import com.intellij.openapi.diagnostic.Logger; |
| import com.intellij.openapi.progress.ProgressIndicator; |
| import com.intellij.openapi.progress.ProgressManager; |
| import com.intellij.openapi.util.text.StringUtil; |
| |
| import java.io.BufferedInputStream; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.lang.reflect.Field; |
| import java.lang.reflect.Method; |
| |
| /** |
| * Created with IntelliJ IDEA. |
| * User: Irina.Chernushina |
| * Date: 7/30/12 |
| * Time: 6:23 PM |
| * |
| * SVNLogInputStream is not used, since it does not check available() |
| * |
| */ |
| public class SVNStoppableInputStream extends InputStream { |
| private final static Logger LOG = Logger.getInstance(SVNStoppableInputStream.class); |
| private final static String ourCheckAvalilable = "svn.check.available"; |
| private final InputStream myOriginalIs; |
| private final InputStream myIn; |
| private boolean myAvailableChecked; |
| private final boolean myCheckAvailable; |
| |
| public SVNStoppableInputStream(InputStream original, InputStream in) { |
| final String property = System.getProperty(ourCheckAvalilable); |
| myCheckAvailable = ! StringUtil.isEmptyOrSpaces(property) && Boolean.parseBoolean(property); |
| //myCheckAvailable = Boolean.parseBoolean(property); |
| myOriginalIs = myCheckAvailable ? digOriginal(original) : original; |
| myIn = in; |
| myAvailableChecked = false; |
| } |
| |
| private InputStream digOriginal(InputStream original) { |
| // because of many delegates in the chain possible |
| InputStream current = original; |
| |
| try { |
| while (true) { |
| final String name = current.getClass().getName(); |
| if ("org.tmatesoft.svn.core.internal.io.dav.http.SpoolFile.SpoolInputStream".equals(name)) { |
| current = byName(current, "myCurrentInput"); |
| } else if ("org.tmatesoft.svn.core.internal.util.ChunkedInputStream".equals(name)) { |
| current = byName(current, "myInputStream"); |
| } else if ("org.tmatesoft.svn.core.internal.util.FixedSizeInputStream".equals(name)) { |
| current = byName(current, "mySource"); |
| } else if (current instanceof BufferedInputStream) { |
| return createReadingProxy(current); |
| } else { |
| // maybe ok class, maybe some unknown proxy |
| Method[] methods = current.getClass().getDeclaredMethods(); |
| for (Method method : methods) { |
| if ("available".equals(method.getName())) { |
| return current; |
| } |
| } |
| return createReadingProxy(current); |
| } |
| } |
| } |
| catch (NoSuchFieldException e) { |
| LOG.info(e); |
| return createReadingProxy(current); |
| } |
| catch (IllegalAccessException e) { |
| LOG.info(e); |
| return createReadingProxy(current); |
| } |
| } |
| |
| private InputStream createReadingProxy(final InputStream current) { |
| return new InputStream() { |
| @Override |
| public int read() throws IOException { |
| return current.read(); |
| } |
| |
| public int read(byte[] b) throws IOException { |
| return current.read(b); |
| } |
| |
| public int read(byte[] b, int off, int len) throws IOException { |
| return current.read(b, off, len); |
| } |
| |
| public long skip(long n) throws IOException { |
| return current.skip(n); |
| } |
| |
| public void close() throws IOException { |
| current.close(); |
| } |
| |
| public void mark(int readlimit) { |
| current.mark(readlimit); |
| } |
| |
| public void reset() throws IOException { |
| current.reset(); |
| } |
| |
| public boolean markSupported() { |
| return current.markSupported(); |
| } |
| |
| @Override |
| public int available() throws IOException { |
| return 1; |
| } |
| }; |
| } |
| |
| private InputStream byName(InputStream current, final String name) throws NoSuchFieldException, IllegalAccessException { |
| final Field input = current.getClass().getDeclaredField(name); |
| input.setAccessible(true); |
| current = (InputStream) input.get(current); |
| return current; |
| } |
| |
| @Override |
| public int read() throws IOException { |
| waitForAvailable(); |
| return myIn.read(); |
| } |
| |
| @Override |
| public int read(byte[] b, int off, int len) throws IOException { |
| waitForAvailable(); |
| return myIn.read(b, off, len); |
| } |
| |
| @Override |
| public long skip(long n) throws IOException { |
| if (n <= 0) return 0; |
| check(); |
| if (available() <= 0) return 0; |
| return myIn.skip(n); |
| } |
| |
| @Override |
| public int available() throws IOException { |
| check(); |
| if (! myAvailableChecked) { |
| int available = myOriginalIs.available(); |
| if (available > 0) { |
| myAvailableChecked = true; |
| } |
| return available; |
| } |
| return 1; |
| } |
| |
| @Override |
| public void close() throws IOException { |
| check(); |
| myIn.close(); |
| } |
| |
| @Override |
| public synchronized void mark(int readlimit) { |
| myIn.mark(readlimit); |
| } |
| |
| @Override |
| public synchronized void reset() throws IOException { |
| check(); |
| myIn.reset(); |
| } |
| |
| @Override |
| public boolean markSupported() { |
| return myIn.markSupported(); |
| } |
| |
| private void check() throws IOException { |
| ProgressIndicator indicator = ProgressManager.getInstance().getProgressIndicator(); |
| if (indicator != null && indicator.isCanceled()) { |
| throw new IOException("Read request to canceled by user"); |
| } |
| } |
| |
| private void waitForAvailable() throws IOException { |
| if (! myCheckAvailable) return; |
| final Object lock = new Object(); |
| synchronized (lock) { |
| while (available() <= 0) { |
| check(); |
| try { |
| lock.wait(100); |
| } |
| catch (InterruptedException e) { |
| // |
| } |
| } |
| } |
| } |
| } |