001/* EventReaderDelegate.java -- 002 Copyright (C) 2005,2006 Free Software Foundation, Inc. 003 004This file is part of GNU Classpath. 005 006GNU Classpath is free software; you can redistribute it and/or modify 007it under the terms of the GNU General Public License as published by 008the Free Software Foundation; either version 2, or (at your option) 009any later version. 010 011GNU Classpath is distributed in the hope that it will be useful, but 012WITHOUT ANY WARRANTY; without even the implied warranty of 013MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 014General Public License for more details. 015 016You should have received a copy of the GNU General Public License 017along with GNU Classpath; see the file COPYING. If not, write to the 018Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 01902110-1301 USA. 020 021Linking this library statically or dynamically with other modules is 022making a combined work based on this library. Thus, the terms and 023conditions of the GNU General Public License cover the whole 024combination. 025 026As a special exception, the copyright holders of this library give you 027permission to link this library with independent modules to produce an 028executable, regardless of the license terms of these independent 029modules, and to copy and distribute the resulting executable under 030terms of your choice, provided that you also meet, for each linked 031independent module, the terms and conditions of the license of that 032module. An independent module is a module which is not derived from 033or based on this library. If you modify this library, you may extend 034this exception to your version of the library, but you are not 035obligated to do so. If you do not wish to do so, delete this 036exception statement from your version. */ 037 038package javax.xml.stream.util; 039 040import java.util.NoSuchElementException; 041import javax.xml.stream.XMLStreamException; 042import javax.xml.stream.XMLEventReader; 043import javax.xml.stream.events.XMLEvent; 044 045/** 046 * Base class for event reader filters. 047 */ 048public class EventReaderDelegate 049 implements XMLEventReader 050{ 051 052 private XMLEventReader parent; 053 054 /** 055 * Constructs an empty filter with no parent set. 056 */ 057 public EventReaderDelegate() 058 { 059 } 060 061 /** 062 * Constructs an empty filter with the given parent. 063 */ 064 public EventReaderDelegate(XMLEventReader reader) 065 { 066 parent = reader; 067 } 068 069 /** 070 * Sets the parent. 071 */ 072 public void setParent(XMLEventReader reader) 073 { 074 parent = reader; 075 } 076 077 /** 078 * Returns the parent. 079 */ 080 public XMLEventReader getParent() 081 { 082 return parent; 083 } 084 085 public XMLEvent nextEvent() 086 throws XMLStreamException 087 { 088 if (parent != null) 089 return parent.nextEvent(); 090 throw new NoSuchElementException(); 091 } 092 093 public Object next() 094 { 095 if (parent != null) 096 return parent.next(); 097 throw new NoSuchElementException(); 098 } 099 100 public boolean hasNext() 101 { 102 if (parent != null) 103 return parent.hasNext(); 104 return false; 105 } 106 107 public XMLEvent peek() 108 throws XMLStreamException 109 { 110 if (parent != null) 111 return parent.peek(); 112 return null; 113 } 114 115 public String getElementText() 116 throws XMLStreamException 117 { 118 if (parent != null) 119 return parent.getElementText(); 120 throw new XMLStreamException(); 121 } 122 123 public XMLEvent nextTag() 124 throws XMLStreamException 125 { 126 if (parent != null) 127 return parent.nextTag(); 128 throw new XMLStreamException(); 129 } 130 131 public Object getProperty(String name) 132 throws IllegalArgumentException 133 { 134 if (parent != null) 135 return parent.getProperty(name); 136 throw new IllegalArgumentException(name); 137 } 138 139 public void close() 140 throws XMLStreamException 141 { 142 if (parent != null) 143 parent.close(); 144 } 145 146 public void remove() 147 { 148 throw new UnsupportedOperationException(); 149 } 150 151} 152