001package org.hl7.fhir.utilities.xml;
002
003/*
004  Copyright (c) 2011+, HL7, Inc.
005  All rights reserved.
006  
007  Redistribution and use in source and binary forms, with or without modification, 
008  are permitted provided that the following conditions are met:
009    
010   * Redistributions of source code must retain the above copyright notice, this 
011     list of conditions and the following disclaimer.
012   * Redistributions in binary form must reproduce the above copyright notice, 
013     this list of conditions and the following disclaimer in the documentation 
014     and/or other materials provided with the distribution.
015   * Neither the name of HL7 nor the names of its contributors may be used to 
016     endorse or promote products derived from this software without specific 
017     prior written permission.
018  
019  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 
020  ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 
021  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 
022  IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 
023  INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 
024  NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 
025  PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
026  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
027  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
028  POSSIBILITY OF SUCH DAMAGE.
029  
030 */
031
032
033
034import java.io.IOException;
035import java.util.Vector;
036
037public class XMLWriterStateStack {
038
039        private Vector<XMLWriterState> items = new Vector<XMLWriterState>();
040
041        public int size(){
042                return items.size();
043        }
044        
045        public boolean empty(){
046                return items.size() == 0;
047        }
048        
049        public XMLWriterState current() throws IOException {
050                if (empty())
051                        throw new IOException("stack is empty trying to get current");
052                return items.get(items.size() - 1);
053        }
054        
055        
056        public void push(XMLWriterState element) {
057                items.add(element);             
058        }
059                
060        public void clear () {
061                if (items != null)
062                  items.clear();
063        }
064
065        public void pop() throws IOException {
066                if (empty())
067                        throw new IOException("stack is empty trying to pop");
068                if (current().isInComment())
069                        throw new IOException("Must close a comment sequence in the element in which it was started");
070                
071                items.remove(items.size() - 1);         
072        }
073
074        public XMLWriterState item(int index) {
075                return items.get(index);
076        }
077
078        public boolean inComment() {
079                for (int i = 0; i < items.size(); i++) {
080                        if (items.get(i).isInComment())
081                                return true;                                    
082                }
083                return false;
084        }
085
086}