// Copyright (C) 2009 The Android Open Source Project
//
// 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.google.gerrit.pgm.util;

import com.google.common.collect.Sets;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.Arrays;
import java.util.Set;

public final class IoUtil {
  public static void copyWithThread(final InputStream src,
      final OutputStream dst) {
    new Thread("IoUtil-Copy") {
      @Override
      public void run() {
        try {
          final byte[] buf = new byte[256];
          int n;
          while (0 < (n = src.read(buf))) {
            dst.write(buf, 0, n);
          }
        } catch (IOException e) {
          e.printStackTrace();
        } finally {
          try {
            src.close();
          } catch (IOException e2) {
          }
        }
      }
    }.start();
  }

  public static void loadJARs(File... jars) {
    ClassLoader cl = IoUtil.class.getClassLoader();
    if (!(cl instanceof URLClassLoader)) {
      throw noAddURL("Not loaded by URLClassLoader", null);
    }

    try (URLClassLoader urlClassLoader = (URLClassLoader) cl) {
      Method addURL;
      try {
        addURL = URLClassLoader.class.getDeclaredMethod("addURL", URL.class);
        addURL.setAccessible(true);
      } catch (SecurityException | NoSuchMethodException e) {
        throw noAddURL("Method addURL not available", e);
      }

      Set<URL> have = Sets.newHashSet(Arrays.asList(urlClassLoader.getURLs()));
      for (File path : jars) {
        try {
          URL url = path.toURI().toURL();
          if (have.add(url)) {
            addURL.invoke(cl, url);
          }
        } catch (MalformedURLException | IllegalArgumentException |
            IllegalAccessException e) {
          throw noAddURL("addURL " + path + " failed", e);
        } catch (InvocationTargetException e) {
          throw noAddURL("addURL " + path + " failed", e.getCause());
        }
      }
    } catch (IOException ioe) {
      throw noAddURL("Error closing URLClassLoader", ioe);
    }
  }

  private static UnsupportedOperationException noAddURL(String m, Throwable why) {
    String prefix = "Cannot extend classpath: ";
    return new UnsupportedOperationException(prefix + m, why);
  }
  private IoUtil() {
  }
}

@@ -1797,13 +1797,82 @@
     
-try (
+@SuppressWarnings(%22resource%22) // Leave open so classes can be loaded.%0A    
 URLC
@@ -1918,22 +1918,19 @@
 ader) cl
-) %7B%0A  
+;%0A%0A
     Meth
@@ -1940,34 +1940,30 @@
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- 
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@@ -2028,26 +2028,24 @@
 ass);%0A      
-  
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@@ -2056,26 +2056,24 @@
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-  
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@@ -2122,26 +2122,24 @@
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-  
 throw noAddU
@@ -2180,23 +2180,19 @@
 e);%0A    
-  
 %7D%0A%0A
-  
     Set%3C
@@ -2265,18 +2265,16 @@
 ));%0A    
- 
- 
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@@ -2288,34 +2288,32 @@
 : jars) %7B%0A      
-  
 try %7B%0A          
@@ -2310,18 +2310,16 @@
         
- 
- 
 URL url 
@@ -2338,26 +2338,24 @@
 ().toURL();%0A
-  
         if (
@@ -2377,26 +2377,24 @@
 %7B%0A          
-  
 addURL.invok
@@ -2405,38 +2405,34 @@
 , url);%0A        
-  %7D%0A  
+%7D%0A
       %7D catch (M
@@ -2491,18 +2491,16 @@
         
-  
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@@ -2511,34 +2511,32 @@
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-  
         throw no
@@ -2578,26 +2578,24 @@
 , e);%0A      
-  
 %7D catch (Inv
@@ -2626,26 +2626,24 @@
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- 
- 
 throw noAddU
@@ -2700,110 +2700,9 @@
     
-  %7D%0A      %7D%0A    %7D catch (IOException ioe) %7B%0A      throw noAddURL(%22Error closing URLClassLoader%22, ioe);
+%7D
 %0A   

Don't always close URLClassLoaders