DupIconsFinder.java

/*
 * Copyright 2000-2016 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.
 */

/*
 * @author max
 */
package com.intellij.internal;

import com.intellij.util.containers.MultiMap;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.util.Collection;
import java.util.Map;

public class DupIconsFinder {

  private static final MultiMap<Integer, String> hashes = new MultiMap<>();
  private static int totalClusters;
  private static int totalDups;

  public static void main(String[] args) throws Exception {
    File root = new File("/Users/max/images/icons");

    processDir(root);

 /*
    Set<String> allIcons = new HashSet<String>();
    ArrayList<String> sorted = new ArrayList<String>(allIcons);
    Collections.sort(sorted);

    for (String icon : sorted) {
      System.out.println(icon);
    }
*/
    for (Map.Entry<Integer, Collection<String>> entry : hashes.entrySet()) {
      printDups(entry.getValue());
    }

    System.out.println("Total: " + totalDups + " files duplicated in " + totalClusters + " clusters");
  }

  private static void processDir(File root) throws Exception {
    File[] files = root.listFiles();
    if (files != null) {
      for (File file : files) {
        if (file.isFile() && file.getName().endsWith(".png")) {
          processFile(file.getPath());
        }
        else if (file.isDirectory()) {
          processDir(file);
        }
      }
    }
  }

  private static void printDups(Collection<String> files) {
    if (files.size() > 1) {
      System.out.println("Duplicate " + files.size() + " files");
      for (String file : files) {
        System.out.println(file);
        totalDups++;
      }
      totalClusters++;
      System.out.println();
    }
  }

  private static void processFile(String path) throws Exception {
    InputStream stream = new BufferedInputStream(new FileInputStream(path));

    int hc = 0;
    while (true) {
      int b = stream.read();
      if (b == -1) break;
      hc = hc * 31 + b;
    }

    hashes.putValue(hc, path);
    stream.close();
  }
}