Example usage for java.util HashMap hashCode

Introduction

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

Prototype

int hashCode();

Source Link

Document

Returns the hash code value for this map.

Usage

From source file:com.google.gwt.emultest.java.util.HashMapTest.java

public void testHashCode() {
    HashMap<String, String> hashMap = new HashMap<String, String>();
    checkEmptyHashMapAssumptions(hashMap);

    // Check that hashCode changes
    int hashCode1 = hashMap.hashCode();
    hashMap.put(KEY_KEY, VALUE_VAL);/*  ww w. ja  v a2s . c  om*/
    int hashCode2 = hashMap.hashCode();

    assertTrue(hashCode1 != hashCode2);
}

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From source file:net.opentsdb.tsd.GraphHandler.java

/** Returns the base path to use for the Gnuplot files. */
private String getGnuplotBasePath(final TSDB tsdb, final HttpQuery query) {
    final Map<String, List<String>> q = query.getQueryString();
    q.remove("ignore");
    // Super cheap caching mechanism: hash the query string.
    final HashMap<String, List<String>> qs = new HashMap<String, List<String>>(q);
    // But first remove the parameters that don't influence the output.
    qs.remove("png");
    qs.remove("json");
    qs.remove("ascii");
    return tsdb.getConfig().getDirectoryName("tsd.http.cachedir") + Integer.toHexString(qs.hashCode());
}

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From source file:org.apereo.services.persondir.support.AttributeBasedCacheKeyGenerator.java

/**
 * Gets the hash of the key elements from the seed {@link Map}. The key elements are specified by
 * the <code>cacheKeyAttributes</code> {@link Set} or if it is <code>null</code> the
 * <code>defaultAttributeName</code> is used as the key attribute.
 *
 * @param seed Seed/* w ww.  ja  v a  2 s  . c om*/
 * @return Hash of key elements from the seed
 */
protected Integer getKeyHash(final Map<String, Object> seed) {
    //Determine the attributes to build the cache key with
    final Set<String> cacheAttributes;
    if (this.useAllAttributes) {
        cacheAttributes = seed.keySet();
    } else if (this.cacheKeyAttributes != null) {
        cacheAttributes = this.cacheKeyAttributes;
    } else {
        cacheAttributes = this.defaultAttributeNameSet;
    }

    //Build the cache key based on the attribute Set
    final HashMap<String, Object> cacheKey = new HashMap<>(cacheAttributes.size());
    for (final String attr : cacheAttributes) {
        if (seed.containsKey(attr)) {
            final Object value = seed.get(attr);

            if (!this.ignoreEmptyAttributes) {
                cacheKey.put(attr, value);
            } else if (value instanceof Collection) {
                if (!CollectionUtils.isEmpty((Collection<?>) value)) {
                    cacheKey.put(attr, value);
                }
            } else if (value instanceof String) {
                if (StringUtils.isNotEmpty((String) value)) {
                    cacheKey.put(attr, value);
                }
            } else if (value != null) {
                cacheKey.put(attr, value);
            }
        }
    }

    if (this.logger.isDebugEnabled()) {
        this.logger.debug("Generated cache Map " + cacheKey + " from seed Map " + seed);
    }

    //If no entries don't return a key
    if (cacheKey.isEmpty()) {
        return null;
    }

    //Return the key map's hash code
    return cacheKey.hashCode();
}

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From source file:pt.webdetails.cdf.dd.ResourceManager.java

public static String buildCacheKey(final String path, final HashMap<String, String> tokens) {

    final StringBuilder keyBuilder = new StringBuilder(path);

    if (tokens != null) {
        keyBuilder.append(tokens.hashCode());
    }//from ww w.ja va  2  s . co  m

    return keyBuilder.toString();
}

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