/*
 * @(#)DefaultListModel.java	1.26 00/02/02
 *
 * Copyright 1997-2000 Sun Microsystems, Inc. All Rights Reserved.
 * 
 * This software is the proprietary information of Sun Microsystems, Inc.  
 * Use is subject to license terms.
 * 
 */

package javax.swing;

import java.util.Vector;
import java.util.Enumeration;

import javax.swing.event.*;


/**
 * This class implements the java.util.Vector API and notifies
 * the ListDataListeners when changes occur.  Presently
 * it delegates to a Vector, in a future release it will be
 * a real Collection implementation.
 * <p>
 * <strong>Warning:</strong>
 * Serialized objects of this class will not be compatible with 
 * future Swing releases.  The current serialization support is appropriate
 * for short term storage or RMI between applications running the same
 * version of Swing.  A future release of Swing will provide support for
 * long term persistence.
 *
 * @version 1.26 02/02/00
 * @author Hans Muller
 */
public class DefaultListModel extends AbstractListModel
{
    private Vector delegate = new Vector();

    /**
     * Returns the number of components in this list.
     * <p>
     * This method is identical to <tt>size()</tt>, which implements the 
     * <tt>List</tt> interface defined in the 1.2 Collections framework.
     * This method exists in conjunction with <tt>setSize()</tt> so that
     * "size" is identifiable as a JavaBean property.
     *
     * @return  the number of components in this list.
     * @see #size()
     */
    public int getSize() {
	return delegate.size();
    }

    /**
     * Returns the component at the specified index.
     * <blockquote>
     * <b>Note:</b> Although this method is not deprecated, the preferred
     *    method to use is <tt>get(int)</tt>, which implements the 
     *    <tt>List</tt> interface defined in the 1.2 Collections framework.
     * </blockquote>
     * @param      index   an index into this list.
     * @return     the component at the specified index.
     * @exception  ArrayIndexOutOfBoundsException  if the <tt>index</tt> 
     *             is negative or not less than the current size of this 
     *             list.
     *             given.
     * @see #get(int)
     */
    public Object getElementAt(int index) {
	return delegate.elementAt(index);
    }

    /**
     * Copies the components of this list into the specified array.
     * The array must be big enough to hold all the objects in this list, 
     * else an <tt>IndexOutOfBoundsException</tt> is thrown.
     *
     * @param   anArray   the array into which the components get copied.
     * @see Vector#copyInto(Object[])
     */
    public void copyInto(Object anArray[]) {
	delegate.copyInto(anArray);
    }

    /**
     * Trims the capacity of this list to be the list's current size.
     * 
     * @see Vector#trimToSize()
     */
    public void trimToSize() {
	delegate.trimToSize();
    }

    /**
     * Increases the capacity of this list, if necessary, to ensure 
     * that it can hold at least the number of components specified by 
     * the minimum capacity argument. 
     *
     * @param   minCapacity   the desired minimum capacity.
     * @see Vector#ensureCapacity(int)
     */
    public void ensureCapacity(int minCapacity) {
	delegate.ensureCapacity(minCapacity);
    }

    /**
     * Sets the size of this list. 
     *
     * @param   newSize   the new size of this list.
     * @see Vector#setSize(int)
     */
    public void setSize(int newSize) {
	int oldSize = delegate.size();
	delegate.setSize(newSize);
	if (oldSize > newSize) {
	    fireIntervalRemoved(this, newSize, oldSize-1);
	}
	else if (oldSize < newSize) {
	    fireIntervalAdded(this, oldSize, newSize-1);
	}
    }

    /**
     * Returns the current capacity of this list.
     *
     * @return  the current capacity
     * @see Vector#capacity()
     */
    public int capacity() {
	return delegate.capacity();
    }

    /**
     * Returns the number of components in this list.
     *
     * @return  the number of components in this list.
     * @see Vector#size()
     */
    public int size() {
	return delegate.size();
    }

    /**
     * Tests if this list has no components.
     *
     * @return  <code>true</code> if and only if this list has 
     *          no components, that is, its size is zero;
     *          <code>false</code> otherwise.
     * @see Vector#isEmpty()
     */
    public boolean isEmpty() {
	return delegate.isEmpty();
    }

    /**
     * Returns an enumeration of the components of this list.
     *
     * @return  an enumeration of the components of this list.
     * @see Vector#elements()
     */
    public Enumeration elements() {
	return delegate.elements();
    }

    /**
     * Tests if the specified object is a component in this list.
     *
     * @param   elem   an object.
     * @return  <code>true</code> if the specified object 
     *          is the same as a component in this list
     * @see Vector#contains(Object)
     */
    public boolean contains(Object elem) {
	return delegate.contains(elem);
    }

    /**
     * Searches for the first occurence of the given argument. 
     *
     * @param   elem   an object.
     * @return  the index of the first occurrence of the argument in this
     *          list; returns <code>-1</code> if the object is not found.
     * @see Vector#indexOf(Object)
     */
    public int indexOf(Object elem) {
	return delegate.indexOf(elem);
    }

    /**
     * Searches for the first occurence of the given argument, beginning 
     * the search at <code>index</code>. 
     *
     * @param   elem    an object.
     * @param   index   the index to start searching from.
     * @return  the index of the first occurrence of the object argument in
     *          this list at position <code>index</code> or later in the
     *          list; returns <code>-1</code> if the object is not found.
     * @see Vector#indexOf(Object,int)
     */
     public int indexOf(Object elem, int index) {
	return delegate.indexOf(elem, index);
    }

    /**
     * Returns the index of the last occurrence of the specified object in
     * this list.
     *
     * @param   elem   the desired component.
     * @return  the index of the last occurrence of the specified object in
     *          this list; returns <code>-1</code> if the object is not found.
     * @see Vector#lastIndexOf(Object)
     */
    public int lastIndexOf(Object elem) {
	return delegate.lastIndexOf(elem);
    }

    /**
     * Searches backwards for the specified object, starting from the 
     * specified index, and returns an index to it. 
     *
     * @param  elem    the desired component.
     * @param  index   the index to start searching from.
     * @return the index of the last occurrence of the specified object in this
     *          list at position less than <code>index</code> in the 
     *          list; <code>-1</code> if the object is not found.
     * @see Vector#lastIndexOf(Object,int)
     */
    public int lastIndexOf(Object elem, int index) {
	return delegate.lastIndexOf(elem, index);
    }

    /**
     * Returns the component at the specified index.
     * Throws an <tt>ArrayIndexOutOfBoundsException</tt> if the index
     * is negative or not less than the size of the list.
     * <blockquote>
     * <b>Note:</b> Although this method is not deprecated, the preferred
     *    method to use is <tt>get(int)</tt>, which implements the 
     *    <tt>List</tt> interface defined in the 1.2 Collections framework.
     * </blockquote>
     *
     * @param      index   an index into this list.
     * @return     the component at the specified index.
     * @see #get(int)
     * @see Vector#elementAt(int)
     */
    public Object elementAt(int index) {
	return delegate.elementAt(index);
    }

    /**
     * Returns the first component of this list.
     * Throws a <tt>NoSuchElementException</tt> if this vector has no components     *
     * @return     the first component of this list
     * @see Vector#firstElement()
     */
    public Object firstElement() {
	return delegate.firstElement();
    }

    /**
     * Returns the last component of the list.
     * Throws a <tt>NoSuchElementException</tt> if this vector has no components     *
     *
     * @return  the last component of the list
     * @see Vector#lastElement()
     */
    public Object lastElement() {
	return delegate.lastElement();
    }

    /**
     * Sets the component at the specified <code>index</code> of this 
     * list to be the specified object. The previous component at that 
     * position is discarded.
     * <p>
     * Throws an <tt>ArrayIndexOutOfBoundsException</tt> if the index 
     * is invalid.
     * <blockquote>
     * <b>Note:</b> Although this method is not deprecated, the preferred
     *    method to use is <tt>set(int,Object)</tt>, which implements the 
     *    <tt>List</tt> interface defined in the 1.2 Collections framework.
     * </blockquote>
     *
     * @param      obj     what the component is to be set to.
     * @param      index   the specified index.
     * @see #set(int,Object)
     * @see Vector#setElementAt(Object,int)
     */
    public void setElementAt(Object obj, int index) {
	delegate.setElementAt(obj, index);
	fireContentsChanged(this, index, index);
    }

    /**
     * Deletes the component at the specified index.
     * <p>
     * Throws an <tt>ArrayIndexOutOfBoundsException</tt> if the index 
     * is invalid.
     * <blockquote>
     * <b>Note:</b> Although this method is not deprecated, the preferred
     *    method to use is <tt>remove(int)</tt>, which implements the 
     *    <tt>List</tt> interface defined in the 1.2 Collections framework.
     * </blockquote>
     *
     * @param      index   the index of the object to remove.
     * @see #remove(int)
     * @see Vector#removeElementAt(int)
     */
    public void removeElementAt(int index) {
	delegate.removeElementAt(index);
	fireIntervalRemoved(this, index, index);
    }

    /**
     * Inserts the specified object as a component in this list at the 
     * specified <code>index</code>.
     * <p>
     * Throws an <tt>ArrayIndexOutOfBoundsException</tt> if the index 
     * is invalid.
     * <blockquote>
     * <b>Note:</b> Although this method is not deprecated, the preferred
     *    method to use is <tt>add(int,Object)</tt>, which implements the 
     *    <tt>List</tt> interface defined in the 1.2 Collections framework.
     * </blockquote>
     *
     * @param      obj     the component to insert.
     * @param      index   where to insert the new component.
     * @exception  ArrayIndexOutOfBoundsException  if the index was invalid.
     * @see #add(int,Object)
     * @see Vector#insertElementAt(Object,int)
     */
    public void insertElementAt(Object obj, int index) {
	delegate.insertElementAt(obj, index);
	fireIntervalAdded(this, index, index);
    }

    /**
     * Adds the specified component to the end of this list. 
     *
     * @param   obj   the component to be added.
     * @see Vector#addElement(Object)
     */
    public void addElement(Object obj) {
	int index = delegate.size();
	delegate.addElement(obj);
	fireIntervalAdded(this, index, index);
    }

    /**
     * Removes the first (lowest-indexed) occurrence of the argument 
     * from this list.
     *
     * @param   obj   the component to be removed.
     * @return  <code>true</code> if the argument was a component of this
     *          list; <code>false</code> otherwise.
     * @see Vector#removeElement(Object)
     */
    public boolean removeElement(Object obj) {
	int index = indexOf(obj);
	boolean rv = delegate.removeElement(obj);
	if (index >= 0) {
	    fireIntervalRemoved(this, index, index);
	}
	return rv;
    }


    /**
     * Removes all components from this list and sets its size to zero.
     * <blockquote>
     * <b>Note:</b> Although this method is not deprecated, the preferred
     *    method to use is <tt>clear()</tt>, which implements the 
     *    <tt>List</tt> interface defined in the 1.2 Collections framework.
     * </blockquote>
     *
     * @see #clear()
     * @see Vector#removeAllElements()
     */
    public void removeAllElements() {
	int index1 = delegate.size()-1;
	delegate.removeAllElements();
	if (index1 >= 0) {
	    fireIntervalRemoved(this, 0, index1);
	}
    }


    /**
     * Returns a string that displays and identifies this
     * object's properties.
     *
     * @return a String representation of this object
     */    public String toString() {
	return delegate.toString();
    }


    /* The remaining methods are included for compatibility with the
     * Java 2 platform Vector class.
     */

    /**
     * Returns an array containing all of the elements in this list in the
     * correct order.
     * <p>
     * Throws an <tt>ArrayStoreException</tt> if the runtime type of the array
     * a is not a supertype of the runtime type of every element in this list.
     *
     * @param a the array into which the elements of the list are to
     *		be stored, if it is big enough; otherwise, a new array of the
     * 		same runtime type is allocated for this purpose.
     * @return an array containing the elements of the list.
     * @see Vector#toArray()
     */
    public Object[] toArray() {
	Object[] rv = new Object[delegate.size()];
	delegate.copyInto(rv);
	return rv;
    }

    /**
     * Returns the element at the specified position in this list.
     * <p>
     * Throws an <tt>ArrayIndexOutOfBoundsException</tt> if the index is out of range
     * (index < 0 || index >= size()).
     *
     * @param index index of element to return.
     */
    public Object get(int index) {
	return delegate.elementAt(index);
    }

    /**
     * Replaces the element at the specified position in this list with the
     * specified element.
     * <p>
     * Throws an <tt>ArrayIndexOutOfBoundsException</tt> if the index is out of range
     * (index < 0 || index >= size()).
     *
     * @param index index of element to replace.
     * @param element element to be stored at the specified position.
     * @return the element previously at the specified position.
     */
    public Object set(int index, Object element) {
	Object rv = delegate.elementAt(index);
	delegate.setElementAt(element, index);
	fireContentsChanged(this, index, index);
	return rv;
    }

    /**
     * Inserts the specified element at the specified position in this list.
     * <p>
     * Throws an <tt>ArrayIndexOutOfBoundsException</tt> if the index is out of range
     * (index < 0 || index >= size()).
     *
     * @param index index at which the specified element is to be inserted.
     * @param element element to be inserted.
     */
    public void add(int index, Object element) {
	delegate.insertElementAt(element, index);
	fireIntervalAdded(this, index, index);
    }

    /**
     * Removes the element at the specified position in this list.
     * Returns the element that was removed from the list.
     * <p>
     * Throws an <tt>ArrayIndexOutOfBoundsException</tt> if the index is out of range
     * (index < 0 || index >= size()).
     *
     * @param index the index of the element to removed.
     */
    public Object remove(int index) {
	Object rv = delegate.elementAt(index);
	delegate.removeElementAt(index);
	fireIntervalRemoved(this, index, index);
	return rv;
    }

    /**
     * Removes all of the elements from this list.  The list will
     * be empty after this call returns (unless it throws an exception).
     */
    public void clear() {
	int index1 = delegate.size()-1;
	delegate.removeAllElements();
	if (index1 >= 0) {
	    fireIntervalRemoved(this, 0, index1);
	}
    }

    /**
     * Deletes the components at the specified range of indexes.
     * The removal is inclusive, so specifying a range of (1,5)
     * removes the component at index 1 and the component at index 5,
     * as well as all components in between.
     * <p>
     * Throws an <tt>ArrayIndexOutOfBoundsException</tt> if the index was invalid.
     * Throws an <tt>IllegalArgumentException</tt> if <tt>fromIndex</tt>
     * > <tt>toIndex</tt>.
     *
     * @param      fromIndex the index of the lower end of the range
     * @param      toIndex   the index of the upper end of the range
     * @see	   #remove(int)
     */
    public void removeRange(int fromIndex, int toIndex) {
	for(int i = toIndex; i >= fromIndex; i--) {
	    delegate.removeElementAt(i);
	}
	fireIntervalRemoved(this, fromIndex, toIndex);
    }

    /*
    public void addAll(Collection c) {
    }

    public void addAll(int index, Collection c) {
    }
    */
}