/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.
 *
 * Project Info:  http://www.jfree.org/jfreechart/index.html
 *
 * This library is free software; you can redistribute it and/or modify it 
 * under the terms of the GNU Lesser General Public License as published by 
 * the Free Software Foundation; either version 2.1 of the License, or 
 * (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful, but 
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 
 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 
 * License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License 
 * along with this library; if not, write to the Free Software Foundation, 
 * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
 *
 * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 
 * in the United States and other countries.]
 *
 * -------------
 * XYSeries.java
 * -------------
 * (C) Copyright 2001-2005, Object Refinery Limited and Contributors.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   Aaron Metzger;
 *                   Jonathan Gabbai;
 *                   Richard Atkinson;
 *                   Michel Santos;
 *
 * $Id: XYSeries.java,v 1.8 2005/02/21 17:29:39 mungady Exp $
 *
 * Changes
 * -------
 * 15-Nov-2001 : Version 1 (DG);
 * 03-Apr-2002 : Added an add(double, double) method (DG);
 * 29-Apr-2002 : Added a clear() method (ARM);
 * 06-Jun-2002 : Updated Javadoc comments (DG);
 * 29-Aug-2002 : Modified to give user control over whether or not duplicate 
 *               x-values are allowed (DG);
 * 07-Oct-2002 : Fixed errors reported by Checkstyle (DG);
 * 11-Nov-2002 : Added maximum item count, code contributed by Jonathan 
 *               Gabbai (DG);
 * 26-Mar-2003 : Implemented Serializable (DG);
 * 04-Aug-2003 : Added getItems() method (DG);
 * 15-Aug-2003 : Changed 'data' from private to protected, added new add() 
 *               methods with a 'notify' argument (DG);
 * 22-Sep-2003 : Added getAllowDuplicateXValues() method (RA);
 * 29-Jan-2004 : Added autoSort attribute, based on a contribution by 
 *               Michel Santos - see patch 886740 (DG);
 * 03-Feb-2004 : Added indexOf() method (DG);
 * 16-Feb-2004 : Added remove() method (DG);
 * 18-Aug-2004 : Moved from org.jfree.data --> org.jfree.data.xy (DG);
 * 21-Feb-2005 : Added update(Number, Number) and addOrUpdate(Number, Number) 
 *               methods (DG);
 *
 */

package org.jfree.data.xy;

import java.io.Serializable;
import java.util.Collections;
import java.util.List;

import org.jfree.data.general.Series;
import org.jfree.data.general.SeriesChangeEvent;
import org.jfree.data.general.SeriesException;
import org.jfree.util.ObjectUtilities;

/**
 * Represents a sequence of zero or more data items in the form (x, y).  Items 
 * in the series will be sorted into ascending order by X-value, and duplicate 
 * X-values are permitted.  Both the sorting and duplicate defaults can be 
 * changed in the constructor.  Y-values can be <code>null</code> to represent 
 * missing values.
 */
public class XYSeries extends Series implements Cloneable, Serializable {

    // In version 0.9.12, in response to several developer requests, I changed 
    // the 'data' attribute from 'private' to 'protected', so that others can 
    // make subclasses that work directly with the underlying data structure.

    /** Storage for the data items in the series. */
    protected List data;

    /** The maximum number of items for the series. */
    private int maximumItemCount = Integer.MAX_VALUE;

    /** A flag that controls whether the items are automatically sorted. */
    private boolean autoSort;
    
    /** A flag that controls whether or not duplicate x-values are allowed. */
    private boolean allowDuplicateXValues;

    /**
     * Creates a new empty series.  By default, items added to the series will 
     * be sorted into ascending order by x-value, and duplicate x-values will 
     * be allowed (these defaults can be modified with another constructor.
     *
     * @param name  the series name (<code>null</code> not permitted).
     */
    public XYSeries(String name) {
        this(name, true, true);
    }

    /**
     * Constructs a new xy-series that contains no data.  You can specify 
     * whether or not duplicate x-values are allowed for the series.
     *
     * @param name  the series name (<code>null</code> not permitted).
     * @param autoSort  a flag that controls whether or not the items in the 
     *                  series are sorted.
     * @param allowDuplicateXValues  a flag that controls whether duplicate 
     *                               x-values are allowed.
     */
    public XYSeries(String name, 
                    boolean autoSort, 
                    boolean allowDuplicateXValues) {
        super(name);
        this.data = new java.util.ArrayList();
        this.autoSort = autoSort;
        this.allowDuplicateXValues = allowDuplicateXValues;
    }

    /**
     * Returns the flag that controls whether the items in the series are 
     * automatically sorted.  There is no setter for this flag, it must be 
     * defined in the series constructor.
     * 
     * @return A boolean.
     */
    public boolean getAutoSort() {
        return this.autoSort;
    }
    
    /**
     * Returns a flag that controls whether duplicate x-values are allowed.  
     * This flag can only be set in the constructor.
     *
     * @return A boolean.
     */
    public boolean getAllowDuplicateXValues() {
        return this.allowDuplicateXValues;
    }

    /**
     * Returns the number of items in the series.
     *
     * @return The item count.
     */
    public int getItemCount() {
        return this.data.size();
    }

    /**
     * Returns the list of data items for the series (the list contains 
     * {@link XYDataItem} objects and is unmodifiable).
     * 
     * @return The list of data items.
     */
    public List getItems() {
        return Collections.unmodifiableList(this.data);    
    }
    
    /**
     * Returns the maximum number of items that will be retained in the series.  
     * The default value is <code>Integer.MAX_VALUE</code>).
     *
     * @return The maximum item count.
     */
    public int getMaximumItemCount() {
        return this.maximumItemCount;
    }

    /**
     * Sets the maximum number of items that will be retained in the series.
     * <P>
     * If you add a new item to the series such that the number of items will 
     * exceed the maximum item count, then the FIRST element in the series is 
     * automatically removed, ensuring that the maximum item count is not 
     * exceeded.
     *
     * @param maximum  the maximum.
     */
    public void setMaximumItemCount(int maximum) {
        this.maximumItemCount = maximum;
    }

    /**
     * Adds a data item to the series and sends a {@link SeriesChangeEvent} to 
     * all registered listeners.
     *
     * @param item  the (x, y) item (<code>null</code> not permitted).
     */
    public void add(XYDataItem item) {
        // argument checking delegated...
        add(item, true);
    }
    
    /**
     * Adds a data item to the series and, if requested, sends a 
     * {@link SeriesChangeEvent} to all registered listeners.
     *
     * @param item  the (x, y) item (<code>null</code> not permitted).
     * @param notify  a flag that controls whether or not a 
     *                {@link SeriesChangeEvent} is sent to all registered 
     *                listeners.
     */
    public void add(XYDataItem item, boolean notify) {

        if (item == null) {
            throw new IllegalArgumentException("Null 'item' argument.");
        }

        int index = Collections.binarySearch(this.data, item);
        if (index < 0) {
            if (this.autoSort) {
                this.data.add(-index - 1, item);
            } 
            else {
                this.data.add(item);
            }
            
            if (getItemCount() > this.maximumItemCount) {
                this.data.remove(0);
            }
        }
        else {
            if (this.allowDuplicateXValues) {
                if (this.autoSort) {
                    // need to make sure we are adding *after* any duplicates
                    int size = this.data.size();
                    while (index < size 
                           && item.compareTo(this.data.get(index)) == 0) {
                        index++;
                    }
                    if (index < this.data.size()) {
                        this.data.add(index, item);
                    }
                    else {
                        this.data.add(item);
                    }
                } 
                else {
                    this.data.add(item);
                }                
                if (getItemCount() > this.maximumItemCount) {
                    this.data.remove(0);
                }
            }
            else {
                throw new SeriesException("X-value already exists.");
            }
        }
        
        if (notify) {
            fireSeriesChanged();
        }

    }

    /**
     * Adds a data item to the series and sends a {@link SeriesChangeEvent} to 
     * all registered listeners.
     *
     * @param x  the x value.
     * @param y  the y value.
     */
    public void add(double x, double y) {
        add(new Double(x), new Double(y), true);
    }

    /**
     * Adds a data item to the series and, if requested, sends a 
     * {@link SeriesChangeEvent} to all registered listeners.
     *
     * @param x  the x value.
     * @param y  the y value.
     * @param notify  a flag that controls whether or not a 
     *                {@link SeriesChangeEvent} is sent to all registered 
     *                listeners.
     */
    public void add(double x, double y, boolean notify) {
        add(new Double(x), new Double(y), notify);
    }

    /**
     * Adds a data item to the series and sends a {@link SeriesChangeEvent} to 
     * all registered listeners.  The unusual pairing of parameter types is to 
     * make it easier to add <code>null</code> y-values.
     *
     * @param x  the x value.
     * @param y  the y value (<code>null</code> permitted).
     */
    public void add(double x, Number y) {
        add(new Double(x), y);
    }

    /**
     * Adds a data item to the series and, if requested, sends a 
     * {@link SeriesChangeEvent} to all registered listeners.  The unusual 
     * pairing of parameter types is to make it easier to add null y-values.
     *
     * @param x  the x value.
     * @param y  the y value (<code>null</code> permitted).
     * @param notify  a flag that controls whether or not a 
     *                {@link SeriesChangeEvent} is sent to all registered 
     *                listeners.
     */
    public void add(double x, Number y, boolean notify) {
        add(new Double(x), y, notify);
    }

    /**
     * Adds new data to the series and sends a {@link SeriesChangeEvent} to 
     * all registered listeners.
     * <P>
     * Throws an exception if the x-value is a duplicate AND the 
     * allowDuplicateXValues flag is false.
     *
     * @param x  the x-value (<code>null</code> not permitted).
     * @param y  the y-value (<code>null</code> permitted).
     */
    public void add(Number x, Number y) {
        // argument checking delegated...
        add(x, y, true);
    }
    
    /**
     * Adds new data to the series and, if requested, sends a 
     * {@link SeriesChangeEvent} to all registered listeners.
     * <P>
     * Throws an exception if the x-value is a duplicate AND the 
     * allowDuplicateXValues flag is false.
     *
     * @param x  the x-value (<code>null</code> not permitted).
     * @param y  the y-value (<code>null</code> permitted).
     * @param notify  a flag the controls whether or not a 
     *                {@link SeriesChangeEvent} is sent to all registered 
     *                listeners.
     */
    public void add(Number x, Number y, boolean notify) {
        if (x == null) {
            throw new IllegalArgumentException("Null 'x' argument.");
        }
        XYDataItem item = new XYDataItem(x, y);
        add(item, notify);
    }

    /**
     * Deletes a range of items from the series and sends a 
     * {@link SeriesChangeEvent} to all registered listeners.
     *
     * @param start  the start index (zero-based).
     * @param end  the end index (zero-based).
     */
    public void delete(int start, int end) {
        for (int i = start; i <= end; i++) {
            this.data.remove(start);
        }
        fireSeriesChanged();
    }

    /**
     * Removes the item at the specified index.
     * 
     * @param index  the index.
     * 
     * @return The item removed.
     */
    public XYDataItem remove(int index) {
        return (XYDataItem) this.data.remove(index);
    }
    
    /**
     * Removes the item(s) with the specified x-value.
     * 
     * @param x  the x-value.

     * @return The item removed.
     */
    public XYDataItem remove(Number x) {
        return remove(indexOf(x));
    }
    
    /**
     * Removes all data items from the series.
     */
    public void clear() {
        if (this.data.size() > 0) {
            this.data.clear();
            fireSeriesChanged();
        }
    }

    /**
     * Return the data item with the specified index.
     *
     * @param index  the index.
     *
     * @return The data item with the specified index.
     */
    public XYDataItem getDataItem(int index) {
        return (XYDataItem) this.data.get(index);
    }

    /**
     * Returns the x-value at the specified index.
     *
     * @param index  the index (zero-based).
     *
     * @return The x-value (never <code>null</code>).
     */
    public Number getX(int index) {
        return getDataItem(index).getX();
    }

    /**
     * Returns the y-value at the specified index.
     *
     * @param index  the index (zero-based).
     *
     * @return The y-value (possibly <code>null</code>).
     */
    public Number getY(int index) {
        return getDataItem(index).getY();
    }

    /**
     * Updates the value of an item in the series and sends a 
     * {@link SeriesChangeEvent} to all registered listeners.
     *
     * @param index  the item (zero based index).
     * @param y  the new value (<code>null</code> permitted).
     */
    public void update(int index, Number y) {
        XYDataItem item = getDataItem(index);
        item.setY(y);
        fireSeriesChanged();
    }
    
    /**
     * Updates an item in the series.
     * 
     * @param x  the x-value (<code>null</code> not permitted).
     * @param y  the y-value (<code>null</code> permitted).
     * 
     * @throws SeriesException if there is no existing item with the specified
     *         x-value.
     */
    public void update(Number x, Number y) {
        XYDataItem item = new XYDataItem(x, y);   
        int index = Collections.binarySearch(this.data, item);
        if (index < 0) {
            throw new SeriesException("No observation for x = " + x);
        }
        else {
            this.data.set(index, item);   
        }
    }
    
    /**
     * Adds or updates an item in the series and sends a 
     * {@link org.jfree.data.general.SeriesChangeEvent} to all registered 
     * listeners.
     *
     * @param x  the x-value (<code>null</code> not permitted).
     * @param y  the y-value (<code>null</code> permitted).
     *
     * @return A copy of the overwritten data item, or <code>null</code> if no 
     *         item was overwritten.
     */
    public XYDataItem addOrUpdate(Number x,Number y) {
        if (x == null) {
            throw new IllegalArgumentException("Null 'x' argument.");   
        }
        XYDataItem overwritten = null;

        XYDataItem key = new XYDataItem(x, y);
        int index = Collections.binarySearch(this.data, key);
        if (index >= 0) {
            XYDataItem existing = (XYDataItem) this.data.get(index);
            try {
                overwritten = (XYDataItem) existing.clone();
            }
            catch (CloneNotSupportedException e) {
                throw new SeriesException("Couldn't clone XYDataItem!");   
            }
            existing.setY(y);
            fireSeriesChanged();
        }
        else {
            this.data.add(-index - 1, new XYDataItem(x, y));
            // check if this addition will exceed the maximum item count...
            if (getItemCount() > this.maximumItemCount) {
                this.data.remove(0);
            }
            fireSeriesChanged();
        }
        return overwritten;
    }

    /**
     * Returns the index of the item with the specified x-value. Note: if the 
     * series is not sorted in order of ascending x-values, the result is 
     * undefined.
     * 
     * @param x  the x-value (<code>null</code> not permitted).
     * 
     * @return The index.
     */
    public int indexOf(Number x) {
        return Collections.binarySearch(this.data, new XYDataItem(x, null));
    } 
    
    /**
     * Returns a clone of the series.
     *
     * @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 series by copying a subset of the data in this time series.
     *
     * @param start  the index of the first item to copy.
     * @param end  the index of the last item to copy.
     *
     * @return A series containing a copy of this series from start until end.
     * 
     * @throws CloneNotSupportedException if there is a cloning problem.
     */
    public XYSeries createCopy(int start, int end) 
        throws CloneNotSupportedException {

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

    }

    /**
     * Tests this series for equality with an arbitrary object.
     *
     * @param object  the object to test against for equality 
     *                (<code>null</code> permitted).
     *
     * @return A boolean.
     */
    public boolean equals(Object object) {

        if (object == null) {
            return false;
        }

        if (object == this) {
            return true;
        }

        if (!super.equals(object)) {
            return false;
        }
        if (!(object instanceof XYSeries)) {
            return false;
        }
        XYSeries s = (XYSeries) object;
        if (this.maximumItemCount != s.maximumItemCount) {
            return false;
        }
        if (this.autoSort != s.autoSort) {
            return false;
        }
        if (this.allowDuplicateXValues != s.allowDuplicateXValues) {
            return false;
        }
        if (!ObjectUtilities.equal(this.data, s.data)) {
            return false;
        }
        return true;
    }
    
    /**
     * Returns a hash code.
     * 
     * @return A hash code.
     */
    public int hashCode() {
        int result = super.hashCode();
        result = 29 * result + (this.data != null ? this.data.hashCode() : 0);
        result = 29 * result + this.maximumItemCount;
        result = 29 * result + (this.autoSort ? 1 : 0);
        result = 29 * result + (this.allowDuplicateXValues ? 1 : 0);
        return result;
    }

}