@param key the key whose associated value is to be incremented. All non-present keys behave as having an implicit value of zero, in which case the delta value is directly inserted into the map. @param delta the amount by which to increment the key's stored value. @return the new value stored for the
(int key, double delta)
| 128 | * @return the new value stored for the given key |
| 129 | */ |
| 130 | public double increment(int key, double delta) |
| 131 | { |
| 132 | if(Double.isNaN(delta)) |
| 133 | throw new IllegalArgumentException("NaN is not an allowable value"); |
| 134 | |
| 135 | long pair_index = getIndex(key); |
| 136 | int deletedIndex = (int) (pair_index >>> 32); |
| 137 | int valOrFreeIndex = (int) (pair_index & INT_MASK); |
| 138 | |
| 139 | if(status[valOrFreeIndex] == OCCUPIED)//easy case |
| 140 | return (table[valOrFreeIndex] += delta); |
| 141 | //else, not present |
| 142 | double toReturn; |
| 143 | int i = valOrFreeIndex; |
| 144 | if(deletedIndex >= 0)//use occupied spot instead |
| 145 | i = deletedIndex; |
| 146 | |
| 147 | status[i] = OCCUPIED; |
| 148 | keys[i] = key; |
| 149 | toReturn = table[i] = delta; |
| 150 | used++; |
| 151 | |
| 152 | enlargeIfNeeded(); |
| 153 | |
| 154 | return toReturn; |
| 155 | } |
| 156 | |
| 157 | /** |
| 158 | * Returns the value to which the specified key is mapped, or |