defaultkeyedvalues.java

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        else {
            this.keys.add(key);
            this.values.add(value);
            this.indexMap.put(key, new Integer(this.keys.size() - 1));
        }
    }
    
    /**
     * Inserts a new value at the specified position in the dataset or, if
     * there is an existing item with the specified key, updates the value 
     * for that item and moves it to the specified position.
     * 
     * @param position  the position (in the range 0 to getItemCount()).
     * @param key  the key (<code>null</code> not permitted).
     * @param value  the value.
     * 
     * @since 1.0.6
     */
    public void insertValue(int position, Comparable key, double value) {
        insertValue(position, key, new Double(value));
    }

    /**
     * Inserts a new value at the specified position in the dataset or, if
     * there is an existing item with the specified key, updates the value 
     * for that item and moves it to the specified position.
     * 
     * @param position  the position (in the range 0 to getItemCount()).
     * @param key  the key (<code>null</code> not permitted).
     * @param value  the value (<code>null</code> permitted).
     * 
     * @since 1.0.6
     */
    public void insertValue(int position, Comparable key, Number value) {
        if (position < 0 || position > getItemCount()) {
            throw new IllegalArgumentException("'position' out of bounds.");
        }
        if (key == null) {
            throw new IllegalArgumentException("Null 'key' argument.");
        }
        int pos = getIndex(key);
        if (pos == position) {
            this.keys.set(pos, key);
            this.values.set(pos, value);
        }
        else {
            if (pos >= 0) {
                this.keys.remove(pos);
                this.values.remove(pos);
            }
          
            this.keys.add(position, key);
            this.values.add(position, value);
            rebuildIndex();
        }
    }

    /**
     * Rebuilds the key to indexed-position mapping after an positioned insert
     * or a remove operation.
     */
    private void rebuildIndex () {
        this.indexMap.clear();
        for (int i = 0; i < this.keys.size(); i++) {
            final Object key = this.keys.get(i);
            this.indexMap.put(key, new Integer(i));
        }
    }

    /**
     * Removes a value from the collection.
     *
     * @param index  the index of the item to remove (in the range 
     *     <code>0</code> to <code>getItemCount() - 1</code>).
     *     
     * @throws IndexOutOfBoundsException if <code>index</code> is not within
     *     the specified range.
     */
    public void removeValue(int index) {
        this.keys.remove(index);
        this.values.remove(index);
        rebuildIndex();
    }

    /**
     * Removes a value from the collection.
     *
     * @param key  the item key (<code>null</code> not permitted).
     * 
     * @throws IllegalArgumentException if <code>key</code> is 
     *     <code>null</code>.
     * @throws UnknownKeyException if <code>key</code> is not recognised.
     */
    public void removeValue(Comparable key) {
        int index = getIndex(key);
        if (index < 0) {
            throw new UnknownKeyException("The key (" + key 
                    + ") is not recognised.");
        }
        removeValue(index);
    }
    
    /**
     * Clears all values from the collection.
     * 
     * @since 1.0.2
     */
    public void clear() {
        this.keys.clear();
        this.values.clear();
        this.indexMap.clear();
    }

    /**
     * Sorts the items in the list by key.
     *
     * @param order  the sort order (<code>null</code> not permitted).
     */
    public void sortByKeys(SortOrder order) {
        final int size = this.keys.size();
        final DefaultKeyedValue[] data = new DefaultKeyedValue[size];

        for (int i = 0; i < size; i++) {
            data[i] = new DefaultKeyedValue((Comparable) this.keys.get(i), 
                    (Number) this.values.get(i));
        }

        Comparator comparator = new KeyedValueComparator(
                KeyedValueComparatorType.BY_KEY, order);
        Arrays.sort(data, comparator);
        clear();

        for (int i = 0; i < data.length; i++) {
            final DefaultKeyedValue value = data[i];
            addValue(value.getKey(), value.getValue());
        }
    }

    /**
     * Sorts the items in the list by value.  If the list contains 
     * <code>null</code> values, they will sort to the end of the list, 
     * irrespective of the sort order.
     *
     * @param order  the sort order (<code>null</code> not permitted).
     */
    public void sortByValues(SortOrder order) {
        final int size = this.keys.size();
        final DefaultKeyedValue[] data = new DefaultKeyedValue[size];
        for (int i = 0; i < size; i++) {
            data[i] = new DefaultKeyedValue((Comparable) this.keys.get(i), 
                    (Number) this.values.get(i));
        }

        Comparator comparator = new KeyedValueComparator(
                KeyedValueComparatorType.BY_VALUE, order);
        Arrays.sort(data, comparator);

        clear();
        for (int i = 0; i < data.length; i++) {
            final DefaultKeyedValue value = data[i];
            addValue(value.getKey(), value.getValue());
        }
    }

    /**
     * Tests if this object is equal to another.
     *
     * @param obj  the object (<code>null</code> permitted).
     *
     * @return A boolean.
     */
    public boolean equals(Object obj) {
        if (obj == this) {
            return true;
        }

        if (!(obj instanceof KeyedValues)) {
            return false;
        }

        KeyedValues that = (KeyedValues) obj;
        int count = getItemCount();
        if (count != that.getItemCount()) {
            return false;
        }

        for (int i = 0; i < count; i++) {
            Comparable k1 = getKey(i);
            Comparable k2 = that.getKey(i);
            if (!k1.equals(k2)) {
                return false;
            }
            Number v1 = getValue(i);
            Number v2 = that.getValue(i);
            if (v1 == null) {
                if (v2 != null) {
                    return false;
                }
            }
            else {
                if (!v1.equals(v2)) {
                    return false;
                }
            }
        }
        return true;
    }

    /**
     * Returns a hash code.
     * 
     * @return A hash code.
     */
    public int hashCode() {
        return (this.keys != null ? this.keys.hashCode() : 0);
    }

    /**
     * Returns a clone.
     * 
     * @return A clone.
     * 
     * @throws CloneNotSupportedException  this class will not throw this 
     *         exception, but subclasses might.
     */
    public Object clone() throws CloneNotSupportedException {
        DefaultKeyedValues clone = (DefaultKeyedValues) super.clone();
        clone.keys = (ArrayList) this.keys.clone();
        clone.values = (ArrayList) this.values.clone();
        clone.indexMap = (HashMap) this.indexMap.clone();
        return clone;
    }
    
}