| /* ObjectId.java -- Simple object identification mechanism for XML encoding. |
| Copyright (C) 2005 Free Software Foundation, Inc. |
| |
| This file is part of GNU Classpath. |
| |
| GNU Classpath is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2, or (at your option) |
| any later version. |
| |
| GNU Classpath 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 |
| General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GNU Classpath; see the file COPYING. If not, write to the |
| Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 02110-1301 USA. |
| |
| Linking this library statically or dynamically with other modules is |
| making a combined work based on this library. Thus, the terms and |
| conditions of the GNU General Public License cover the whole |
| combination. |
| |
| As a special exception, the copyright holders of this library give you |
| permission to link this library with independent modules to produce an |
| executable, regardless of the license terms of these independent |
| modules, and to copy and distribute the resulting executable under |
| terms of your choice, provided that you also meet, for each linked |
| independent module, the terms and conditions of the license of that |
| module. An independent module is a module which is not derived from |
| or based on this library. If you modify this library, you may extend |
| this exception to your version of the library, but you are not |
| obligated to do so. If you do not wish to do so, delete this |
| exception statement from your version. */ |
| |
| |
| package gnu.java.beans.encoder; |
| |
| import java.util.HashMap; |
| |
| /** |
| * <p> |
| * ObjectId provides an object identification mechanism which gives each object |
| * a name in the form <code><class><Nameindex></code>. |
| * </p> |
| * |
| * <p> |
| * Each id can be in an unused state which means that only one instance of the |
| * object is in use and a special id is not needed. Certain {@link |
| * gnu.java.beans.encoder.elements.Element} subclasses use this feature to find |
| * out whether they write the "id" attribute or not. |
| * </p> |
| * <p> |
| * An <code>ObjectId</code> instance is typically given to multiple objects. |
| * The second user should then invoke the {@link #init} method to generate the |
| * identification string and bring the id in the 'used' state. |
| * </p> |
| * |
| * @author Robert Schuster (robertschuster@fsfe.org) |
| */ |
| public class ObjectId |
| { |
| /** |
| * Stores the index an object of a specific type should be given. |
| */ |
| private static HashMap nameIndices = new HashMap(); |
| |
| private String id; |
| |
| private Class klass; |
| |
| ObjectId(Class klass) |
| { |
| this.klass = klass; |
| } |
| |
| public boolean isUnused() |
| { |
| return id == null; |
| } |
| |
| public String toString() |
| { |
| return (id != null) ? id : "<unused id>"; |
| } |
| |
| /** |
| * <p> |
| * Generates a simple Id by concatenating a class name with a self-increasing |
| * number. |
| * </p> |
| */ |
| public void init() |
| { |
| assert (klass != null); |
| |
| if (id != null) |
| return; |
| |
| Integer count = (Integer) nameIndices.get(klass); |
| if (count == null) |
| { |
| count = Integer.valueOf(0); |
| } |
| |
| if (klass.isArray()) |
| { |
| Class ct = klass.getComponentType(); |
| if (ct == Boolean.TYPE) |
| id = "booleanArray" + count.intValue(); |
| else if (ct == Byte.TYPE) |
| id = "byteArray" + count.intValue(); |
| else if (ct == Short.TYPE) |
| id = "shortArray" + count.intValue(); |
| else if (ct == Integer.TYPE) |
| id = "intArray" + count.intValue(); |
| else if (ct == Long.TYPE) |
| id = "longArray" + count.intValue(); |
| else if (ct == Float.TYPE) |
| id = "floatArray" + count.intValue(); |
| else if (ct == Double.TYPE) |
| id = "doubleArray" + count.intValue(); |
| } |
| else |
| id = klass.getName() + count.intValue(); |
| |
| nameIndices.put(klass, Integer.valueOf(count.intValue() + 1)); |
| } |
| |
| } |