public int hashCode() {
        int h = 0;
        for (Entry<String, String[]> stringEntry : metadata.entrySet()) {
            h += getMetadataEntryHashCode(stringEntry);
        }
        return h;
    }
Returns the number of metadata names in this metadata.

@return number of metadata names
tika-core/src/main/java/org/apache/tika/metadata/Metadata.java