content: /*
   * Copyright (C) 2007 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.taobao.android.dx.dex.file;
  
  import com.taobao.android.dx.util.AnnotatedOutput;
  import java.util.Collection;
  import java.util.HashMap;
  import java.util.TreeMap;
  
  /**
   * Statistics about the contents of a file.
   */
  public final class Statistics {
      /** {@code non-null;} data about each type of item */
      private final HashMap<String, Data> dataMap;
  
      /**
       * Constructs an instance.
       */
      public Statistics() {
          dataMap = new HashMap<String, Data>(50);
      }
  
      /**
       * Adds the given item to the statistics.
       *
       * @param item {@code non-null;} the item to add
       */
      public void add(Item item) {
          String typeName = item.typeName();
          Data data = dataMap.get(typeName);
  
          if (data == null) {
              dataMap.put(typeName, new Data(item, typeName));
          } else {
              data.add(item);
          }
      }
  
      /**
       * Adds the given list of items to the statistics.
       *
       * @param list {@code non-null;} the list of items to add
       */
      public void addAll(Section list) {
          Collection<? extends Item> items = list.items();
          for (Item item : items) {
              add(item);
          }
      }
  
      /**
       * Writes the statistics as an annotation.
       *
       * @param out {@code non-null;} where to write to
       */
      public final void writeAnnotation(AnnotatedOutput out) {
          if (dataMap.size() == 0) {
              return;
          }
  
          out.annotate(0, "\nstatistics:\n");
  
          TreeMap<String, Data> sortedData = new TreeMap<String, Data>();
  
          for (Data data : dataMap.values()) {
              sortedData.put(data.name, data);
          }
  
          for (Data data : sortedData.values()) {
              data.writeAnnotation(out);
          }
      }
  
      public String toHuman() {
          StringBuilder sb = new StringBuilder();
  
          sb.append("Statistics:\n");
  
          TreeMap<String, Data> sortedData = new TreeMap<String, Data>();
  
          for (Data data : dataMap.values()) {
              sortedData.put(data.name, data);
          }
  
          for (Data data : sortedData.values()) {
              sb.append(data.toHuman());
          }
  
          return sb.toString();
      }
  
      /**
       * Statistical data about a particular class.
       */
      private static class Data {
          /** {@code non-null;} name to use as a label */
          private final String name;
  
          /** {@code >= 0;} number of instances */
          private int count;
  
          /** {@code >= 0;} total size of instances in bytes */
          private int totalSize;
  
          /** {@code >= 0;} largest size of any individual item */
          private int largestSize;
  
          /** {@code >= 0;} smallest size of any individual item */
          private int smallestSize;
  
          /**
           * Constructs an instance for the given item.
           *
           * @param item {@code non-null;} item in question
           * @param name {@code non-null;} type name to use
           */
          public Data(Item item, String name) {
              int size = item.writeSize();
  
              this.name = name;
              this.count = 1;
              this.totalSize = size;
              this.largestSize = size;
              this.smallestSize = size;
          }
  
          /**
           * Incorporates a new item. This assumes the type name matches.
           *
           * @param item {@code non-null;} item to incorporate
           */
          public void add(Item item) {
              int size = item.writeSize();
  
              count++;
              totalSize += size;
  
              if (size > largestSize) {
                  largestSize = size;
              }
  
              if (size < smallestSize) {
                  smallestSize = size;
              }
          }
  
          /**
           * Writes this instance as an annotation.
           *
           * @param out {@code non-null;} where to write to
           */
          public void writeAnnotation(AnnotatedOutput out) {
              out.annotate(toHuman());
          }
  
          /**
           * Generates a human-readable string for this data item.
           *
           * @return string for human consumption.
           */
          public String toHuman() {
              StringBuilder sb = new StringBuilder();
  
              sb.append("  " + name + ": " +
                           count + " item" + (count == 1 ? "" : "s") + "; " +
                           totalSize + " bytes total\n");
  
              if (smallestSize == largestSize) {
                  sb.append("    " + smallestSize + " bytes/item\n");
              } else {
                  int average = totalSize / count;
                  sb.append("    " + smallestSize + ".." + largestSize +
                               " bytes/item; average " + average + "\n");
              }
  
              return sb.toString();
          }
      }
  }
  