001 /* 002 * Copyright (C) 2010 eXo Platform SAS. 003 * 004 * This is free software; you can redistribute it and/or modify it 005 * under the terms of the GNU Lesser General Public License as 006 * published by the Free Software Foundation; either version 2.1 of 007 * the License, or (at your option) any later version. 008 * 009 * This software is distributed in the hope that it will be useful, 010 * but WITHOUT ANY WARRANTY; without even the implied warranty of 011 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 012 * Lesser General Public License for more details. 013 * 014 * You should have received a copy of the GNU Lesser General Public 015 * License along with this software; if not, write to the Free 016 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 017 * 02110-1301 USA, or see the FSF site: http://www.fsf.org. 018 */ 019 020 package org.crsh.cmdline.matcher; 021 022 import java.util.HashMap; 023 import java.util.Map; 024 025 /** 026 * @author <a href="mailto:julien.viet@exoplatform.com">Julien Viet</a> 027 * @version $Revision$ 028 */ 029 public class InvocationContext { 030 031 /** . */ 032 private final Map<Class<?>, Object> attributes; 033 034 public InvocationContext() { 035 this.attributes = new HashMap<Class<?>, Object>(); 036 } 037 038 public <T> void setAttribute(Class<T> key, T value) { 039 if (key == null) { 040 throw new NullPointerException(); 041 } 042 if (value == null) { 043 attributes.remove(key); 044 } else { 045 attributes.put(key, value); 046 } 047 } 048 049 public <T> T getAttribute(Class<T> key) { 050 Object value = attributes.get(key); 051 return value != null ? key.cast(value) : null; 052 } 053 }