timeperiodvalues.java

用于制作报表的中间件控件,纯java编写,还附带有数据库操作的源代码

            long minMiddle = s + (e - s) / 2;
            if (middle < minMiddle) {
                this.minMiddleIndex = index;           
            }
        }
        else {
            this.minMiddleIndex = index;
        }
        
        if (this.maxMiddleIndex >= 0) {
            long s = getDataItem(this.minMiddleIndex).getPeriod().getStart()
                .getTime();
            long e = getDataItem(this.minMiddleIndex).getPeriod().getEnd()
                .getTime();
            long maxMiddle = s + (e - s) / 2;
            if (middle > maxMiddle) {
                this.maxMiddleIndex = index;           
            }
        }
        else {
            this.maxMiddleIndex = index;
        }
        
        if (this.minEndIndex >= 0) {
            long minEnd = getDataItem(this.minEndIndex).getPeriod().getEnd()
                .getTime();
            if (end < minEnd) {
                this.minEndIndex = index;           
            }
        }
        else {
            this.minEndIndex = index;
        }
       
        if (this.maxEndIndex >= 0) {
            long maxEnd = getDataItem(this.maxEndIndex).getPeriod().getEnd()
                .getTime();
            if (end > maxEnd) {
                this.maxEndIndex = index;           
            }
        }
        else {
            this.maxEndIndex = index;
        }
        
    }
    
    /**
     * Recalculates the bounds for the collection of items.
     */
    private void recalculateBounds() {
        this.minStartIndex = -1;
        this.minMiddleIndex = -1;
        this.minEndIndex = -1;
        this.maxStartIndex = -1;
        this.maxMiddleIndex = -1;
        this.maxEndIndex = -1;
        for (int i = 0; i < this.data.size(); i++) {
            TimePeriodValue tpv = (TimePeriodValue) this.data.get(i);
            updateBounds(tpv.getPeriod(), i);
        }
    }

    /**
     * Adds a new data item to the series and sends a {@link SeriesChangeEvent}
     * to all registered listeners.
     *
     * @param period  the time period (<code>null</code> not permitted).
     * @param value  the value.
     * 
     * @see #add(TimePeriod, Number)
     */
    public void add(TimePeriod period, double value) {
        TimePeriodValue item = new TimePeriodValue(period, value);
        add(item);
    }

    /**
     * Adds a new data item to the series and sends a {@link SeriesChangeEvent}
     * to all registered listeners.
     *
     * @param period  the time period (<code>null</code> not permitted).
     * @param value  the value (<code>null</code> permitted).
     */
    public void add(TimePeriod period, Number value) {
        TimePeriodValue item = new TimePeriodValue(period, value);
        add(item);
    }

    /**
     * Updates (changes) the value of a data item and sends a 
     * {@link SeriesChangeEvent} to all registered listeners.
     *
     * @param index  the index of the data item to update.
     * @param value  the new value (<code>null</code> not permitted).
     */
    public void update(int index, Number value) {
        TimePeriodValue item = getDataItem(index);
        item.setValue(value);
        fireSeriesChanged();
    }

    /**
     * Deletes data from start until end index (end inclusive) and sends a
     * {@link SeriesChangeEvent} to all registered listeners.
     *
     * @param start  the index of the first period to delete.
     * @param end  the index of the last period to delete.
     */
    public void delete(int start, int end) {
        for (int i = 0; i <= (end - start); i++) {
            this.data.remove(start);
        }
        recalculateBounds();
        fireSeriesChanged();
    }
    
    /**
     * Tests the series for equality with another object.
     *
     * @param obj  the object (<code>null</code> permitted).
     *
     * @return <code>true</code> or <code>false</code>.
     */
    public boolean equals(Object obj) {
        if (obj == this) {
            return true;
        }
        if (!(obj instanceof TimePeriodValues)) {
            return false;
        }
        if (!super.equals(obj)) {
            return false;
        }
        TimePeriodValues that = (TimePeriodValues) obj;
        if (!ObjectUtilities.equal(this.getDomainDescription(), 
                that.getDomainDescription())) {
            return false;
        }
        if (!ObjectUtilities.equal(this.getRangeDescription(), 
                that.getRangeDescription())) {
            return false;
        }
        int count = getItemCount();
        if (count != that.getItemCount()) {
            return false;
        }
        for (int i = 0; i < count; i++) {
            if (!getDataItem(i).equals(that.getDataItem(i))) {
                return false;
            }
        }
        return true;
    }

    /**
     * Returns a hash code value for the object.
     *
     * @return The hashcode
     */
    public int hashCode() {
        int result;
        result = (this.domain != null ? this.domain.hashCode() : 0);
        result = 29 * result + (this.range != null ? this.range.hashCode() : 0);
        result = 29 * result + this.data.hashCode();
        result = 29 * result + this.minStartIndex;
        result = 29 * result + this.maxStartIndex;
        result = 29 * result + this.minMiddleIndex;
        result = 29 * result + this.maxMiddleIndex;
        result = 29 * result + this.minEndIndex;
        result = 29 * result + this.maxEndIndex;
        return result;
    }

    /**
     * Returns a clone of the collection.
     * <P>
     * Notes:
     * <ul>
     *   <li>no need to clone the domain and range descriptions, since String 
     *       object is immutable;</li>
     *   <li>we pass over to the more general method createCopy(start, end).
     *   </li>
     * </ul>
     *
     * @return A clone of the time series.
     * 
     * @throws CloneNotSupportedException if there is a cloning problem.
     */
    public Object clone() throws CloneNotSupportedException {
        Object clone = createCopy(0, getItemCount() - 1);
        return clone;
    }

    /**
     * Creates a new instance by copying a subset of the data in this 
     * collection.
     *
     * @param start  the index of the first item to copy.
     * @param end  the index of the last item to copy.
     *
     * @return A copy of a subset of the items.
     * 
     * @throws CloneNotSupportedException if there is a cloning problem.
     */
    public TimePeriodValues createCopy(int start, int end) 
        throws CloneNotSupportedException {

        TimePeriodValues copy = (TimePeriodValues) super.clone();

        copy.data = new ArrayList();
        if (this.data.size() > 0) {
            for (int index = start; index <= end; index++) {
                TimePeriodValue item = (TimePeriodValue) this.data.get(index);
                TimePeriodValue clone = (TimePeriodValue) item.clone();
                try {
                    copy.add(clone);
                }
                catch (SeriesException e) {
                    System.err.println("Failed to add cloned item.");
                }
            }
        }
        return copy;

    }
    
    /**
     * Returns the index of the time period with the minimum start milliseconds.
     * 
     * @return The index.
     */
    public int getMinStartIndex() {
        return this.minStartIndex;
    }
    
    /**
     * Returns the index of the time period with the maximum start milliseconds.
     * 
     * @return The index.
     */
    public int getMaxStartIndex() {
        return this.maxStartIndex;
    }

    /**
     * Returns the index of the time period with the minimum middle 
     * milliseconds.
     * 
     * @return The index.
     */
    public int getMinMiddleIndex() {
        return this.minMiddleIndex;
    }
    
    /**
     * Returns the index of the time period with the maximum middle 
     * milliseconds.
     * 
     * @return The index.
     */
    public int getMaxMiddleIndex() {
        return this.maxMiddleIndex;
    }

    /**
     * Returns the index of the time period with the minimum end milliseconds.
     * 
     * @return The index.
     */
    public int getMinEndIndex() {
        return this.minEndIndex;
    }
    
    /**
     * Returns the index of the time period with the maximum end milliseconds.
     * 
     * @return The index.
     */
    public int getMaxEndIndex() {
        return this.maxEndIndex;
    }

}