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/*
* 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.android.dx.dex.file;
import com.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();
}
}
}
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