001/*
002Copyright (c) 2011+, HL7, Inc
003All rights reserved.
004
005Redistribution and use in source and binary forms, with or without modification, 
006are permitted provided that the following conditions are met:
007
008 * Redistributions of source code must retain the above copyright notice, this 
009   list of conditions and the following disclaimer.
010 * Redistributions in binary form must reproduce the above copyright notice, 
011   this list of conditions and the following disclaimer in the documentation 
012   and/or other materials provided with the distribution.
013 * Neither the name of HL7 nor the names of its contributors may be used to 
014   endorse or promote products derived from this software without specific 
015   prior written permission.
016
017THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 
018ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 
019WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 
020IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 
021INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 
022NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 
023PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
024WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
025ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
026POSSIBILITY OF SUCH DAMAGE.
027
028*/
029
030package org.hl7.fhir.utilities.xml;
031
032/*
033 * #%L
034 * HAPI FHIR - Core Library
035 * %%
036 * Copyright (C) 2014 - 2017 University Health Network
037 * %%
038 * Licensed under the Apache License, Version 2.0 (the "License");
039 * you may not use this file except in compliance with the License.
040 * You may obtain a copy of the License at
041 * 
042 *      http://www.apache.org/licenses/LICENSE-2.0
043 * 
044 * Unless required by applicable law or agreed to in writing, software
045 * distributed under the License is distributed on an "AS IS" BASIS,
046 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
047 * See the License for the specific language governing permissions and
048 * limitations under the License.
049 * #L%
050 */
051
052
053import java.io.IOException;
054import java.util.Vector;
055
056public class XMLWriterStateStack {
057
058        private Vector<XMLWriterState> items = new Vector<XMLWriterState>();
059
060        public int size(){
061                return items.size();
062        }
063        
064        public boolean empty(){
065                return items.size() == 0;
066        }
067        
068        public XMLWriterState current() throws IOException {
069                if (empty())
070                        throw new IOException("stack is empty trying to get current");
071                return items.get(items.size() - 1);
072        }
073        
074        
075        public void push(XMLWriterState element) {
076                items.add(element);             
077        }
078                
079        public void clear () {
080                if (items != null)
081                  items.clear();
082        }
083
084        public void pop() throws IOException {
085                if (empty())
086                        throw new IOException("stack is empty trying to pop");
087                if (current().isInComment())
088                        throw new IOException("Must close a comment sequence in the element in which it was started");
089                
090                items.remove(items.size() - 1);         
091        }
092
093        public XMLWriterState item(int index) {
094                return items.get(index);
095        }
096
097        public boolean inComment() {
098                for (int i = 0; i < items.size(); i++) {
099                        if (items.get(i).isInComment())
100                                return true;                                    
101                }
102                return false;
103        }
104
105}