attributesimpl.java

Default implementation of the Attributes interface

		return data[i+4];
	    }
	}
	return null;
    }



    ////////////////////////////////////////////////////////////////////
    // Manipulators.
    ////////////////////////////////////////////////////////////////////


    /**
     * Clear the attribute list for reuse.
     *
     * <p>Note that no memory is actually freed by this call:
     * the current arrays are kept so that they can be
     * reused.</p>
     */
    public void clear ()
    {
	length = 0;
    }


    /**
     * Copy an entire Attributes object.
     *
     * <p>It may be more efficient to reuse an existing object
     * rather than constantly allocating new ones.</p>
     *
     * @param atts The attributes to copy.
     */
    public void setAttributes (Attributes atts)
    {
	clear();
	length = atts.getLength();
	data = new String[length*5];
	for (int i = 0; i < length; i++) {
	    data[i*5] = atts.getURI(i);
	    data[i*5+1] = atts.getLocalName(i);
	    data[i*5+2] = atts.getQName(i);
	    data[i*5+3] = atts.getType(i);
	    data[i*5+4] = atts.getValue(i);
	}
    }


    /**
     * Add an attribute to the end of the list.
     *
     * <p>For the sake of speed, this method does no checking
     * to see if the attribute is already in the list: that is
     * the responsibility of the application.</p>
     *
     * @param uri The Namespace URI, or the empty string if
     *        none is available or Namespace processing is not
     *        being performed.
     * @param localName The local name, or the empty string if
     *        Namespace processing is not being performed.
     * @param qName The qualified (prefixed) name, or the empty string
     *        if qualified names are not available.
     * @param type The attribute type as a string.
     * @param value The attribute value.
     */
    public void addAttribute (String uri, String localName, String qName,
			      String type, String value)
    {
	ensureCapacity(length+1);
	data[length*5] = uri;
	data[length*5+1] = localName;
	data[length*5+2] = qName;
	data[length*5+3] = type;
	data[length*5+4] = value;
	length++;
    }


    /**
     * Set an attribute in the list.
     *
     * <p>For the sake of speed, this method does no checking
     * for name conflicts or well-formedness: such checks are the
     * responsibility of the application.</p>
     *
     * @param index The index of the attribute (zero-based).
     * @param uri The Namespace URI, or the empty string if
     *        none is available or Namespace processing is not
     *        being performed.
     * @param localName The local name, or the empty string if
     *        Namespace processing is not being performed.
     * @param qName The qualified name, or the empty string
     *        if qualified names are not available.
     * @param type The attribute type as a string.
     * @param value The attribute value.
     * @exception java.lang.ArrayIndexOutOfBoundsException When the
     *            supplied index does not point to an attribute
     *            in the list.
     */
    public void setAttribute (int index, String uri, String localName,
			      String qName, String type, String value)
    {
	if (index >= 0 && index < length) {
	    data[index*5] = uri;
	    data[index*5+1] = localName;
	    data[index*5+2] = qName;
	    data[index*5+3] = type;
	    data[index*5+4] = value;
	} else {
	    badIndex(index);
	}
    }


    /**
     * Remove an attribute from the list.
     *
     * @param index The index of the attribute (zero-based).
     * @exception java.lang.ArrayIndexOutOfBoundsException When the
     *            supplied index does not point to an attribute
     *            in the list.
     */
    public void removeAttribute (int index)
    {
	if (index >= 0 && index < length) {
	    data[index] = null;
	    if (index < length - 1) {
		System.arraycopy(data, (index+1)*5, data, index*5,
				 (length-index)*5);
	    }
	    length--;
	} else {
	    badIndex(index);
	}
    }


    /**
     * Set the Namespace URI of a specific attribute.
     *
     * @param index The index of the attribute (zero-based).
     * @param uri The attribute's Namespace URI, or the empty
     *        string for none.
     * @exception java.lang.ArrayIndexOutOfBoundsException When the
     *            supplied index does not point to an attribute
     *            in the list.
     */
    public void setURI (int index, String uri)
    {
	if (index >= 0 && index < length) {
	    data[index*5] = uri;
	} else {
	    badIndex(index);
	}
    }


    /**
     * Set the local name of a specific attribute.
     *
     * @param index The index of the attribute (zero-based).
     * @param localName The attribute's local name, or the empty
     *        string for none.
     * @exception java.lang.ArrayIndexOutOfBoundsException When the
     *            supplied index does not point to an attribute
     *            in the list.
     */
    public void setLocalName (int index, String localName)
    {
	if (index >= 0 && index < length) {
	    data[index*5+1] = localName;
	} else {
	    badIndex(index);
	}
    }


    /**
     * Set the qualified name of a specific attribute.
     *
     * @param index The index of the attribute (zero-based).
     * @param qName The attribute's qualified name, or the empty
     *        string for none.
     * @exception java.lang.ArrayIndexOutOfBoundsException When the
     *            supplied index does not point to an attribute
     *            in the list.
     */
    public void setQName (int index, String qName)
    {
	if (index >= 0 && index < length) {
	    data[index*5+2] = qName;
	} else {
	    badIndex(index);
	}
    }


    /**
     * Set the type of a specific attribute.
     *
     * @param index The index of the attribute (zero-based).
     * @param type The attribute's type.
     * @exception java.lang.ArrayIndexOutOfBoundsException When the
     *            supplied index does not point to an attribute
     *            in the list.
     */
    public void setType (int index, String type)
    {
	if (index >= 0 && index < length) {
	    data[index*5+3] = type;
	} else {
	    badIndex(index);
	}
    }


    /**
     * Set the value of a specific attribute.
     *
     * @param index The index of the attribute (zero-based).
     * @param value The attribute's value.
     * @exception java.lang.ArrayIndexOutOfBoundsException When the
     *            supplied index does not point to an attribute
     *            in the list.
     */
    public void setValue (int index, String value)
    {
	if (index >= 0 && index < length) {
	    data[index*5+4] = value;
	} else {
	    badIndex(index);
	}
    }



    ////////////////////////////////////////////////////////////////////
    // Internal methods.
    ////////////////////////////////////////////////////////////////////


    /**
     * Ensure the internal array's capacity.
     *
     * @param n The minimum number of attributes that the array must
     *        be able to hold.
     */
    private void ensureCapacity (int n)
    {
	if (n > 0 && data == null) {
	    data = new String[25];
	}

	int max = data.length;
	if (max >= n * 5) {
	    return;
	}


	while (max < n * 5) {
	    max *= 2;
	}
	String newData[] = new String[max];
	System.arraycopy(data, 0, newData, 0, length*5);
	data = newData;
    }


    /**
     * Report a bad array index in a manipulator.
     *
     * @param index The index to report.
     * @exception java.lang.ArrayIndexOutOfBoundsException Always.
     */
    private void badIndex (int index)
	throws ArrayIndexOutOfBoundsException
    {
	String msg =
	    "Attempt to modify attribute at illegal index: " + index;
	throw new ArrayIndexOutOfBoundsException(msg);
    }



    ////////////////////////////////////////////////////////////////////
    // Internal state.
    ////////////////////////////////////////////////////////////////////

    int length;
    String data [];

}

// end of AttributesImpl.java