content: /*
   * Copyright (C) 2015 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.android.preload.actions;
  
  import com.android.preload.DumpData;
  import com.android.preload.DumpTableModel;
  import com.android.preload.Main;
  
  import java.awt.event.ActionEvent;
  import java.io.File;
  import java.io.PrintWriter;
  import java.util.HashMap;
  import java.util.HashSet;
  import java.util.List;
  import java.util.Map;
  import java.util.Set;
  import java.util.TreeSet;
  import java.util.regex.Pattern;
  
  import javax.swing.AbstractAction;
  
  /**
   * Compute an intersection of classes from the given data. A class is in the intersection if it
   * appears in at least the number of threshold given packages. An optional blacklist can be
   * used to filter classes from the intersection.
   */
  public class ComputeThresholdAction extends AbstractThreadedAction {
      protected int threshold;
      private Pattern blacklist;
      private DumpTableModel dataTableModel;
  
      /**
       * Create an action with the given parameters. The blacklist is a regular expression
       * that filters classes.
       */
      public ComputeThresholdAction(String name, DumpTableModel dataTableModel, int threshold,
              String blacklist) {
          super(name);
          this.dataTableModel = dataTableModel;
          this.threshold = threshold;
          if (blacklist != null) {
              this.blacklist = Pattern.compile(blacklist);
          }
      }
  
      @Override
      public void actionPerformed(ActionEvent e) {
          List<DumpData> data = dataTableModel.getData();
          if (data.size() == 0) {
              Main.getUI().showMessageDialog("No data available, please scan packages or run "
                      + "monkeys.");
              return;
          }
          if (data.size() == 1) {
              Main.getUI().showMessageDialog("Cannot compute list from only one data set, please "
                      + "scan packages or run monkeys.");
              return;
          }
  
          super.actionPerformed(e);
      }
  
      @Override
      public void run() {
          Main.getUI().showWaitDialog();
  
          Map<String, Set<String>> uses = new HashMap<String, Set<String>>();
          for (DumpData d : dataTableModel.getData()) {
              Main.getUI().updateWaitDialog("Merging " + d.getPackageName());
              updateClassUse(d.getPackageName(), uses, getBootClassPathClasses(d.getDumpData()));
          }
  
          Main.getUI().updateWaitDialog("Computing thresholded set");
          Set<String> result = fromThreshold(uses, blacklist, threshold);
          Main.getUI().hideWaitDialog();
  
          boolean ret = Main.getUI().showConfirmDialog("Computed a set with " + result.size()
                  + " classes, would you like to save to disk?", "Save?");
          if (ret) {
              File f = Main.getUI().showSaveDialog();
              if (f != null) {
                  saveSet(result, f);
              }
          }
      }
  
      private Set<String> fromThreshold(Map<String, Set<String>> classUses, Pattern blacklist,
              int threshold) {
          TreeSet<String> ret = new TreeSet<>(); // TreeSet so it's nicely ordered by name.
  
          for (Map.Entry<String, Set<String>> e : classUses.entrySet()) {
              if (e.getValue().size() >= threshold) {
                  if (blacklist == null || !blacklist.matcher(e.getKey()).matches()) {
                      ret.add(e.getKey());
                  }
              }
          }
  
          return ret;
      }
  
      private static void updateClassUse(String pkg, Map<String, Set<String>> classUses,
              Set<String> classes) {
          for (String className : classes) {
              Set<String> old = classUses.get(className);
              if (old == null) {
                  classUses.put(className, new HashSet<String>());
              }
              classUses.get(className).add(pkg);
          }
      }
  
      private static Set<String> getBootClassPathClasses(Map<String, String> source) {
          Set<String> ret = new HashSet<>();
          for (Map.Entry<String, String> e : source.entrySet()) {
              if (e.getValue() == null) {
                  ret.add(e.getKey());
              }
          }
          return ret;
      }
  
      private static void saveSet(Set<String> result, File f) {
          try {
              PrintWriter out = new PrintWriter(f);
              for (String s : result) {
                  out.println(s);
              }
              out.close();
          } catch (Exception e) {
              e.printStackTrace();
          }
      }
  }