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

private static void setHeader(HttpUriRequest request, Map<String, String> headers) {
    if (headers == null || headers.size() == 0) {
        throw new NullPointerException("headers not be null");
    }/*  ww w  .  j  a v  a 2s .c o m*/
    for (Entry<String, String> entry : headers.entrySet()) {
        request.addHeader(entry.getKey(), entry.getValue());
    }
}

From source file:Main.java

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

From source file:Main.java

public static String jointUrl(String url, Map<String, String> params) {
    if (params != null && params.size() > 0) {
        Uri uri = Uri.parse(url);//from   w  w  w .j a  va  2  s .c o m
        Uri.Builder b = uri.buildUpon();
        for (Map.Entry<String, String> entry : params.entrySet()) {
            b.appendQueryParameter(entry.getKey(), entry.getValue());
        }
        return b.build().toString();
    }
    return url;
}

From source file:Main.java

static <K, V> Map<K, V> getMap(Map<K, V> orig) {
    if (orig == null || orig.size() == 0) {
        return Collections.emptyMap();
    } else if (orig.size() == 1) {
        final Map.Entry<K, V> entry = orig.entrySet().iterator().next();
        return Collections.singletonMap(entry.getKey(), entry.getValue());
    } else {//  w  ww .  j  av a2  s  .  co m
        return Collections.unmodifiableMap(new TreeMap<>(orig));
    }
}

From source file:Main.java

public static boolean isNotEmpty(Map<? extends Object, ? extends Object> map) {
    return map != null && map.size() > 0;
}

From source file:Main.java

/**
 * Returns the same map <code>theMap</code> if it has elements,
 * otherwise it returns a new <code>HashMap</code>.
 * Can be used in combination with {@link CollectionUtil#emptyMapIfNull(List)} to
 * use a singleton empty map as initial value.
 * <p>//from   www  . j a v a 2  s  . com
 * <strong>Pre:</strong> <code>theMap != null</code>
 * </p>
 * <p>
 * <strong>Post:</strong> <code>result</code> is writable. 
 * @param <TK> Element type of the keys
 * @param <TV> Element type of the values
 * @param theList A <code>List</code>
 * @return The same <code>Map</code> if <code>theMap.size() > 0</code> or a new <code>HashMap</code>  
 */
public static <TK, TV> Map<TK, TV> initAsHashMap(final Map<TK, TV> theMap) {
    if (theMap.size() == 0)
        return new HashMap<TK, TV>();
    else
        return theMap;
}

From source file:Main.java

public static boolean emptyMap(Map hash) {
    boolean result = true;
    if ((hash != null) && (hash.size() > 0)) {
        result = false;/*from  ww w  .  ja v a2  s  . c  o  m*/
    }
    return result;
}

From source file:Main.java

/**
 * <p>//from www.  ja v a2s. c  om
 * A method to check whether the <tt>map</tt> is empty or not.
 *</p>
 *
 *
 * @param mapToCheck
 *       a <tt>Map</tt> which needs to be checked
 *
 * @return
 *       a boolean value (true/false) indicating the status
 */
public static boolean isEmptyMap(Map<? extends Object, ? extends Object> mapToCheck) {
    return (mapToCheck.size() <= 0);
}

From source file:Main.java

public static boolean isNotEmpty(Map<?, ?> map) {
    return (map != null) && (map.size() > 0);
}

From source file:Main.java

/**
 * Return <code>true</code> if the supplied Map is not <code>null</code>
 * and contain only one element. Otherwise, return <code>false</code>.<br>
 *
 * @param map the Map to be checked/*from w w  w . jav  a 2  s . c o m*/
 * @return whether the given Map is Single
 */
public static boolean isSingle(Map<?, ?> map) {
    return (map != null && map.size() == 1);
}