Example usage for java.util Map containsKey

Introduction

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

Prototype

boolean containsKey(Object key);

Source Link

Document

Returns true if this map contains a mapping for the specified key.

Usage

From source file:Main.java

/**
 * Puts passed value to passed {@link Map} instance on passed key of such
 * does not contained or its associated key does not equals passed value
 * //from   w w  w . j ava 2  s.co m
 * @param map
 * @param key
 * @param value
 */
public static <K, V> void checkAndAdd(Map<K, V> map, K key, V value) {

    boolean contained = map.containsKey(key) && value.equals(map.get(key));
    if (Boolean.FALSE.equals(contained)) {
        map.put(key, value);
    }
}

From source file:Main.java

public static <K, V> void addToMap(K key, V value, Map<K, Set<V>> map) {

    if (key != null && value != null)
        if (map.containsKey(key))
            map.get(key).add(value);//w w w .j a  va2  s.c  om
        else {
            Set<V> values = new TreeSet<V>();
            values.add(value);
            map.put(key, values);
        }
}

From source file:Main.java

public static <T> Set removeRepetition(Collection<T> ts) {
    if (ts == null || ts.isEmpty()) {
        return Collections.emptySet();
    }/*from   ww  w .j  a va 2s .  c o m*/
    Map<T, Object> map = new LinkedHashMap();
    for (T t : ts) {
        if (!map.containsKey(t)) {
            map.put(t, -1);
        }
    }
    Set<T> set = map.keySet();
    return set;
}

From source file:Main.java

public static <T> Map<T, Integer> frequency(Collection<? extends T> collection) {
    Map<T, Integer> res = new TreeMap<>();
    for (T element : collection) {
        if (!res.containsKey(element)) {
            res.put(element, Collections.frequency(collection, element));
        }/*from   w  w  w  . ja v  a 2 s .c o m*/
    }
    return res;
}

From source file:Main.java

public static <K, V> Map<K, Set<V>> groupByKeyEmpty(List<K> keys) {
    Map<K, Set<V>> map = new HashMap<K, Set<V>>();
    for (K key : keys) {
        if (!map.containsKey(key)) {
            map.put(key, new HashSet<V>());
        }//from w ww.ja  v  a  2 s.c  om
    }
    return map;
}

From source file:com.flaptor.indextank.query.analyzers.StopAnalyzer.java

private static Set<String> getStopWords(Map<Object, Object> analyzerConfiguration) {
    if (analyzerConfiguration.containsKey(STOPWORDS)) {
        JSONArray stopwordList = (JSONArray) analyzerConfiguration.get(STOPWORDS);
        Set<String> stopwords = new HashSet<String>(stopwordList.size());
        for (Object stopword : stopwordList) {
            if (!(stopword instanceof String)) {
                throw new IllegalArgumentException("Stopwords aren't Strings");
            }/*  w  ww  .  j  a va2  s . c  om*/
            stopwords.add((String) stopword);
        }
        return stopwords;
    } else {
        return ImmutableSet.of();
    }
}

From source file:Main.java

public static <T, U> boolean containsKey(Map<T, U> map, T key) {
    if (map == null) {
        return false;
    }/*from  w  ww.j  a  v  a2s .  com*/
    return map.containsKey(key);
}

From source file:org.eclipse.swordfish.core.configuration.xml.SaxParsingPrototype.java

private static void putElement(Map<String, List<String>> props, String key, String value) {
    if (props.containsKey(key)) {
        props.get(key).add(value);/*from   ww w  . j  a v  a2s .  c o m*/
    } else {
        List<String> list = new LinkedList<String>();
        list.add(value);
        props.put(key, list);
    }
}

From source file:Main.java

public static String getMapValue(Map<String, Object> map, String key) {
    String value = "";
    if (map != null) {
        if (map.containsKey(key) && map.get(key) != null) {
            value = (String) map.get(key);
        }/*from  www .  ja v a  2s  . com*/
    }
    return value;
}

From source file:Main.java

public static <K> Map safeGetMap(Map<K, Object> map, K key) {
    if (map == null) {
        return null;
    } else {/*from  w w  w . ja  v a 2s  .co m*/
        return map.containsKey(key) ? (Map) map.get(key) : null;
    }
}