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/**
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* Copyright (C) 2015 EDIT
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* European Distributed Institute of Taxonomy
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* http://www.e-taxonomy.eu
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*
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* The contents of this file are subject to the Mozilla Public License Version 1.1
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* See LICENSE.TXT at the top of this package for the full license terms.
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*/
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package eu.etaxonomy.cdm.strategy.cache;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.SortedSet;
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import java.util.Stack;
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import java.util.TreeSet;
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import org.apache.commons.lang3.StringUtils;
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/**
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* Formatter class to create Strings from TaggedText Lists.
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*
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* @author a.mueller
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* @since 09.09.2015
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*/
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public class TaggedCacheHelper {
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private static final TaggedText WHITESPACE_TAG = TaggedText.NewWhitespaceInstance();
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/**
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* Creates a string from tagged text by concatenating all tags with a whitespace.
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* @param tags
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* @return the concatenated string
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* @see #createString(List, HTMLTagRules)
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*/
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public static String createString(List<? extends TaggedText> tags) {
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StringBuilder result = new StringBuilder();
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boolean isSeparator;
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boolean wasSeparator = true; //true for start tag
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int index = 0;
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for (index = 0; index < tags.size(); index++){
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TaggedText tag = tags.get(index);
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isSeparator = tag.getType().isSeparator();
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if (! wasSeparator && ! isSeparator ){
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result.append(" ");
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}
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if (index < tags.size() -1 || tag.getType() != TagEnum.postSeparator ){
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result.append(tag.getText());
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}
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wasSeparator = isSeparator;
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}
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return result.toString().trim();
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}
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/**
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* Creates a string from tagged text by concatenating all tags. If no separator tag is defined
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* tags are separated by simple whitespace.
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*/
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public static String createString(List<TaggedText> tagsOrigin, HTMLTagRules htmlRules) {
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if (htmlRules == null){
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return createString(tagsOrigin);
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}
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List<TaggedText> tags = new ArrayList<>(tagsOrigin);
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//add whitespace separators
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int index = 0;
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boolean wasSeparator = true;
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while (index < tags.size()){
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if (! tags.get(index).getType().isSeparator()){
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if (wasSeparator == false){
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tags.add(index++, WHITESPACE_TAG);
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}else{
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wasSeparator = false;
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}
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}else{
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wasSeparator = true;
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}
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index++;
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}
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//create String
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StringBuffer result = new StringBuffer();
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Stack<String> htmlStack = new Stack<>();
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for (int i = 0; i < tags.size(); i++ ){
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TaggedText tag = tags.get(i);
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TaggedText lastTag = (i == 0? null : tags.get(i - 1));
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TaggedText nextTag = (i + 1 >= tags.size() ? null : tags.get(i + 1));
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TagEnum lastType = (lastTag == null ? null : lastTag.getType());
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TagEnum nextType = (nextTag == null ? null : nextTag.getType());
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boolean isSeparator = tag.getType().isSeparator();
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boolean isBlankSeparator = isSeparator && StringUtils.isBlank(tag.getText());
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//compute list of rules (tags)
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SortedSet<String> separatorRules;
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if (isBlankSeparator){
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separatorRules = getCommonRules(htmlRules.getRule(lastTag), htmlRules.getRule(nextTag));
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}else{
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separatorRules = htmlRules.getRule(tag);
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}
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//Close all tags not used anymore and remove all common tags from list of rules
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for (int j = 0 ; j < htmlStack.size() ; j++){
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String html = htmlStack.get(j);
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if (! separatorRules.contains(html)){
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closeHtml(result, htmlStack, j);
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break;
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}else{
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separatorRules.remove(html);
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}
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}
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//open all tags not yet existing
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if (! isBlankSeparator){
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for (String rule : separatorRules){
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htmlStack.add(rule);
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result.append("<" + rule + ">");
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}
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}
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//add whitespace
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if (!isSeparator && lastType != null && !lastType.isSeparator() && nextType != null){
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result.append(" ");
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}
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result.append(tag.getText());
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}
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closeHtml(result, htmlStack, 0);
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return result.toString();
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}
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private static void closeHtml(StringBuffer result, Stack<String> htmlStack, int index) {
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while (htmlStack.size() > index){
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String closeHtml = htmlStack.pop();
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result.append("</" + closeHtml + ">");
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}
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}
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private static SortedSet<String> getCommonRules(SortedSet<String> rules1,SortedSet<String> rules2) {
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SortedSet<String> result = new TreeSet<>();
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for (String str : rules1){
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if (rules2.contains(str)){
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result.add(str);
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}
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}
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return result;
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}
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}
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