Example usage for java.util Map get

Introduction

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

Prototype

V get(Object key);

Source Link

Document

Returns the value to which the specified key is mapped, or null if this map contains no mapping for the key.

Usage

From source file:Main.java

/**
 * Remove an element from a map whose values are lists of elements.
 * @param <T> the type of the keys in the map.
 * @param <U> the type of the elements in the lists.
 * @param key the key for the value to remove.
 * @param value the value to remove.//from w  w w .j a va 2 s .  c om
 * @param map the map from which to remove the key/value pair.
 */
public static <T, U> void removeFromListMap(T key, U value, Map<T, List<U>> map) {
    List<U> list = map.get(key);
    if (list == null)
        return;
    list.remove(value);
    if (list.isEmpty())
        map.remove(key);
}

From source file:Main.java

public static ByteBuffer getServiceDataFromEnv(String serviceName, Map<String, String> env) {
    String meta = env.get(getPrefixServiceName(serviceName));
    if (null == meta) {
        return null;
    }/*from  w w w.  j a va  2s  .  c  om*/
    byte[] metaData = Base64.decodeBase64(meta);
    return ByteBuffer.wrap(metaData);
}

From source file:Main.java

public static String parseCharset(Map<String, String> headers) {
    String contentType = headers.get("Content-Type");
    if (contentType != null) {
        String[] params = contentType.split(";");

        for (int i = 1; i < params.length; ++i) {
            String[] pair = params[i].trim().split("=");
            if (pair.length == 2 && pair[0].equals("charset")) {
                return pair[1];
            }/*  ww w  . j  av  a  2s .  c  o  m*/
        }
    }

    return "UTF-8";
}

From source file:Main.java

/**
 * //from w  w  w .  jav  a2s  .  co m
 * Turns a column of the resultset's value into Set
 * 
 * @param results
 * @param key
 *          key to get the value from the result set
 * @return null if results is null
 */
public static Set<String> turnMapResultToSet(List<? extends Map<?, ?>> results, String key) {

    if (results == null)
        return null;

    Set<String> set = new HashSet<String>(results.size());
    for (Map<?, ?> map : results) {
        set.add((String) map.get(key));
    }
    return set;
}

From source file:Main.java

private static int getSortNr(Map<String, Integer> components, String component) {
    int sortnr = components.get(component);
    if (sortnr == 0) {
        // unsorted new entries get to the bottom
        return MAX_SORTNR;
    }//  ww  w.j a v  a 2 s .com
    return sortnr;
}

From source file:Main.java

public static <K, V> Set<V> mkSet(Map<K, Set<V>> multiMap, K key) {
    Set<V> list = multiMap.get(key);
    if (list == null) {
        list = new HashSet<>();
        multiMap.put(key, list);//  w w  w  .ja  v a 2s .  co  m
    }
    return list;
}

From source file:Main.java

public static <K, V extends Comparable<V>> void addToValueSortedSet(Map<K, SortedSet<V>> map, K key, V value) {
    SortedSet<V> values = map.get(key);
    if (values == null) {
        values = new TreeSet<V>();
        map.put(key, values);// ww w.java  2 s .  c om
    }
    values.add(value);
}

From source file:Main.java

@SuppressWarnings({ "rawtypes", "unchecked" })
public static Map extractHitPointFromRect(Map rect) {
    Map hitPoint = new HashMap();
    hitPoint.put("x", rect.get("center_x"));
    hitPoint.put("y", rect.get("center_y"));
    return hitPoint;
}

From source file:Main.java

public static void addNode(Document doc, Node parent, String ns, String name, String text, Map NS_MAP) {
    Element child = doc.createElementNS((String) NS_MAP.get(ns), ns + ":" + name);
    child.appendChild(doc.createTextNode(text));
    parent.appendChild(child);// www .j a v a  2  s  .  co  m
}

From source file:Main.java

public static <T> T getFirst(Map<String, List<T>> multiValutMap, String key) {
    List<T> values = multiValutMap.get(key);
    if (values != null && !values.isEmpty())
        return values.get(0);
    return null;/* w  w w.  j  ava 2 s. c  om*/
}