Example usage for java.util Comparator Comparator

Introduction

In this page you can find the example usage for java.util Comparator Comparator.

Prototype

Comparator

Source Link

Usage

From source file:Main.java

/**
 * Creates a map which is sorted by entry values.
 *   //from   w ww  .  j a  v  a2s.  c  o m
 * @param map the original map
 * 
 * @param <K> the key type
 * @param <V> the value type
 * 
 * @return a map which is by entry values.
 */
public static <K, V extends Comparable<? super V>> SortedSet<Map.Entry<K, V>> getEntriesSortedByValues(
        Map<K, V> map) {
    SortedSet<Map.Entry<K, V>> sortedEntries = new TreeSet<Map.Entry<K, V>>(new Comparator<Map.Entry<K, V>>() {
        @Override
        public int compare(Map.Entry<K, V> e1, Map.Entry<K, V> e2) {
            return e1.getValue().compareTo(e2.getValue());
        }
    });
    sortedEntries.addAll(map.entrySet());
    return sortedEntries;
}

From source file:Main.java

private static void mergeExeBatchFiles() {
    File file = new File(batchDir);
    System.out.println("debug:current path = " + file.getAbsolutePath());
    File[] files = file.listFiles();
    if (files == null || files.length == 0) {
        return;// w w  w .j  a v a  2  s. c o  m
    }
    Arrays.sort(files, new Comparator<File>() {
        public int compare(File file1, File file2) {
            if (file1.lastModified() > file2.lastModified()) {
                return 1;
            } else if (file1.lastModified() < file2.lastModified()) {
                return -1;
            } else {
                return 0;
            }
        }
    });
    StringBuffer command = new StringBuffer();
    for (File f : files) {
        command.append("call ").append(f.getAbsolutePath()).append("\n");
    }
    try {
        String filePath = batchDir + "build.bat";
        writeFile(filePath, command.toString());
        Runtime.getRuntime().exec("cmd /c start " + filePath);
    } catch (Exception e) {
        e.printStackTrace();
    }
}

From source file:Main.java

public static <K, V extends Comparable<? super V>> LinkedHashMap<K, V> sortMapByValue(Map<K, V> map,
        final boolean descending) {
    List<Map.Entry<K, V>> list = new LinkedList<Map.Entry<K, V>>(map.entrySet());
    Collections.sort(list, new Comparator<Map.Entry<K, V>>() {

        public int compare(Map.Entry<K, V> o1, Map.Entry<K, V> o2) {
            int comp = (o1.getValue()).compareTo(o2.getValue());

            if (descending) {
                comp = comp * (-1);/*from www  . ja v a 2 s.  c  om*/
            }

            return comp;
        }
    });

    LinkedHashMap<K, V> result = new LinkedHashMap<K, V>();
    for (Map.Entry<K, V> entry : list) {
        result.put(entry.getKey(), entry.getValue());
    }
    return result;
}

From source file:Main.java

public static <T> Comparator<T> inverseComparator(final Comparator<T> comp) {
    return new Comparator<T>() {
        public int compare(T o1, T o2) {
            return comp.compare(o2, o1);
        }/*from   ww w.j  ava  2  s . c  om*/
    };
}

From source file:Main.java

/**
 * Sort a map according to its values in ascending order when asc=true and i descending order otherwise.
 * @param unsortedMap //from  w w w .j  a  va  2 s .  c  o m
 * @param asc
 * @return
 */
public static Map<String, Integer> sortUsingComparator(Map<String, Integer> unsortedMap, final boolean asc) {

    // Convert Map to List
    List<Map.Entry<String, Integer>> list = new LinkedList<Map.Entry<String, Integer>>(unsortedMap.entrySet());

    // Sort a list using custom comparator, to compare the Map values
    Collections.sort(list, new Comparator<Map.Entry<String, Integer>>() {
        public int compare(Map.Entry<String, Integer> o1, Map.Entry<String, Integer> o2) {
            if (asc) {
                return (o1.getValue()).compareTo(o2.getValue());
            } else {
                return -1 * (o1.getValue()).compareTo(o2.getValue());
            }
        }
    });

    // Convert the sorted map back to a Map
    Map<String, Integer> sortedMap = new LinkedHashMap<String, Integer>();
    for (Iterator<Map.Entry<String, Integer>> it = list.iterator(); it.hasNext();) {
        Map.Entry<String, Integer> entry = it.next();
        sortedMap.put(entry.getKey(), entry.getValue());
    }
    return sortedMap;
}

From source file:Main.java

private static void sortFieldsByName(Field[] array) {
    Arrays.sort(array, new Comparator<Field>() {
        @Override//from w ww  .jav a2 s  .c  o  m
        public int compare(Field current, Field next) {
            String currentName = current.getName();
            String nextName = next.getName();
            return currentName.compareTo(nextName);
        }
    });
}

From source file:Main.java

public static <K, V> Comparator<Entry<K, V>> entryComparator(final Comparator<? super K> keyComparator) {
    return new Comparator<Entry<K, V>>() {
        @Override/*from   w  ww. j  a  v a 2s  .  com*/
        @SuppressWarnings("unchecked")
        // no less safe than putting it in the map!
        public int compare(Entry<K, V> a, Entry<K, V> b) {
            return (keyComparator == null) ? ((Comparable) a.getKey()).compareTo(b.getKey())
                    : keyComparator.compare(a.getKey(), b.getKey());
        }
    };
}

From source file:Main.java

public static String prepareFilePathForVideoSaveWithDraftUri(Uri draftUri) {
    String draftPath = draftUri.getPath();
    String draftMediaDirPath = draftPath.substring(0, draftPath.length() - 5);
    File draftMediaDir = new File(draftMediaDirPath);
    if (!draftMediaDir.exists()) {
        draftMediaDir.mkdirs();//from w ww  .  ja  v a  2  s . c  om
    }
    String[] files = draftMediaDir.list(new FilenameFilter() {
        @Override
        public boolean accept(File dir, String filename) {
            return filename.endsWith("-0.mp4") || filename.endsWith("-a.mp4");
        }
    });
    List<String> filePaths = Arrays.asList(files);
    Collections.sort(filePaths, new Comparator<String>() {
        @Override
        public int compare(String lhs, String rhs) {
            return rhs.compareTo(lhs);
        }
    });
    if (filePaths.size() > 0) {
        for (String file : filePaths) {
            return new File(draftMediaDir, file.substring(0, file.length() - 6) + ".mp4").getAbsolutePath();
        }
    }
    return new File(draftMediaDir, generateRandomFilename("mp4")).getAbsolutePath();
}

From source file:cherry.foundation.bizcal.BizYearUtil.java

public static Range<LocalDate> between(LocalDate from, LocalDate to) {
    return Range.between(from, to, new Comparator<LocalDate>() {
        @Override//from   w ww .  j a va2 s . co m
        public int compare(LocalDate o1, LocalDate o2) {
            return o1.compareTo(o2);
        }
    });
}

From source file:Main.java

/**
 * @return a comparator that provides the natural ordering (i.e. the order defined by T.compareTo(T)
 *//*from w  w w .j a  v  a  2  s .  co m*/
public static <T extends Comparable<T>> Comparator<T> naturalComparator() {
    return new Comparator<T>() {
        public int compare(T o1, T o2) {
            return o1.compareTo(o2);
        }
    };
}