Example usage for java.util Map size

Introduction

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

Prototype

int size();

Source Link

Document

Returns the number of key-value mappings in this map.

Usage

From source file:Main.java

public static Collection<Object> getSortedValues(Map<Integer, Object> vParameters) {
    if (vParameters == null || vParameters.size() == 0)
        return null;
    Set<Integer> keys = vParameters.keySet();

    SortedMap<Integer, Object> sortedMap = new TreeMap<Integer, Object>(vParameters);
    Collection<Object> result = sortedMap.values();
    return result;
}

From source file:Main.java

public static List<NameValuePair> convertParams(Map<String, String> params) {
    if (params == null || params.size() == 0)
        return null;

    List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
    Set<Entry<String, String>> setEntry = params.entrySet();
    BasicNameValuePair bnvp = null;//from w w w  .  j a v  a  2 s  .c  om

    for (Entry<String, String> entry : setEntry) {
        bnvp = new BasicNameValuePair(entry.getKey(), entry.getValue());
        nameValuePairs.add(bnvp);
    }

    return nameValuePairs;
}

From source file:Main.java

public static boolean isEmpty(Map<?, ?> values) {
    return values == null || values.size() == 0;
}

From source file:Main.java

/**
 * Return true if this map is null or it's empty.
 * //from   ww w.  java 2  s . co  m
 * @param map
 * @return
 */
public static boolean isEmpty(Map<? extends Object, ? extends Object> map) {
    return map == null || map.size() == 0;
}

From source file:Main.java

/**
 * json//from ww w  . j  av  a  2  s . c o m
 * @param params
 * @return
 */
public static String buildJsonString(Map<String, Object> params) {
    if (params == null || params.size() == 0)
        return null;

    Set<Entry<String, Object>> setEntry = params.entrySet();
    StringBuilder str = new StringBuilder();
    str.append("{");
    for (Entry<String, Object> entry : setEntry) {
        str.append("\"");
        str.append(entry.getKey());
        str.append("\"");
        str.append(":");
        if (entry.getValue() instanceof String) {
            str.append("\"");
        }
        str.append(entry.getValue());
        if (entry.getValue() instanceof String) {
            str.append("\"");
        }
        str.append(",");
    }
    str.setCharAt(str.length() - 1, '}');
    return str.toString();
}

From source file:Main.java

public static int getLength(Map<?, ?> map) {
    if (map == null) {
        return 0;
    }/*w  ww.  j  a  v a 2  s.co m*/

    return map.size();
}

From source file:Main.java

/**
 * Reverses a map (switches key and value types).
 *
 * @param <K> the key type/*from www  .  j  a va  2 s.c o  m*/
 * @param <V> the value type
 * @param map the map
 *
 * @return the reversed map
 */
public static <K, V> Map<V, K> reverse(final Map<K, V> map) {
    final Map<V, K> reversed = new HashMap<V, K>(map.size());
    for (final Entry<K, V> e : map.entrySet()) {
        reversed.put(e.getValue(), e.getKey());
    }
    return reversed;
}

From source file:Main.java

/**
 * join paras/*w  w  w.  jav a 2s  .  com*/
 *
 * @param parasMap paras map, key is para name, value is para value
 * @return join key and value with {@link #EQUAL_SIGN}, join keys with {@link #PARAMETERS_SEPARATOR}
 */
public static String joinParas(Map<String, String> parasMap) {
    if (parasMap == null || parasMap.size() == 0) {
        return null;
    }

    StringBuilder paras = new StringBuilder();
    Iterator<Map.Entry<String, String>> ite = parasMap.entrySet().iterator();
    while (ite.hasNext()) {
        Map.Entry<String, String> entry = (Map.Entry<String, String>) ite.next();
        paras.append(entry.getKey()).append(EQUAL_SIGN).append(entry.getValue());
        if (ite.hasNext()) {
            paras.append(PARAMETERS_SEPARATOR);
        }
    }
    return paras.toString();
}

From source file:Main.java

/**
 * Nullsafe method returning the number of entries the incoming map contains.
 *
 * @param m Map of Map.Entry objects to count the number of entries from
 * @return int containing the number of the entries in the map, or -1 if the map is null
 *//*from w  w w . ja va  2 s  .  co m*/
public static int size(Map m) {
    int size = -1;

    if (m != null) {
        size = m.size();
    }

    return size;
}

From source file:Main.java

/**
 * @param map map//ww w.  ja v  a 2 s  .c o m
 * @return map deep copy
 */
public static Map<String, Set<String>> cloneMap(Map<String, Set<String>> map) {
    final Map<String, Set<String>> clone = new HashMap<>(map.size());
    for (Map.Entry<String, Set<String>> entry : map.entrySet()) {
        final Set<String> cloneSet = new HashSet<>(entry.getValue());
        clone.put(entry.getKey(), cloneSet);
    }

    return clone;
}