Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;

import java.util.HashMap;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Main {
    public static String unescapeXML(final String xml) {
        Pattern xmlEntityRegex = Pattern.compile("&(#?)([^;]+);");
        //Unfortunately, Matcher requires a StringBuffer instead of a StringBuilder
        StringBuffer unescapedOutput = new StringBuffer(xml.length());

        Matcher m = xmlEntityRegex.matcher(xml);
        Map<String, String> builtinEntities = null;
        String entity;
        String hashmark;
        String ent;
        int code;
        while (m.find()) {
            ent = m.group(2);
            hashmark = m.group(1);
            if ((hashmark != null) && (hashmark.length() > 0)) {
                code = Integer.parseInt(ent);
                entity = Character.toString((char) code);
            } else {
                //must be a non-numerical entity
                if (builtinEntities == null) {
                    builtinEntities = buildBuiltinXMLEntityMap();
                }
                entity = builtinEntities.get(ent);
                if (entity == null) {
                    //not a known entity - ignore it
                    entity = "&" + ent + ';';
                }
            }
            m.appendReplacement(unescapedOutput, entity);
        }
        m.appendTail(unescapedOutput);

        return unescapedOutput.toString();
    }

    private static Map<String, String> buildBuiltinXMLEntityMap() {
        Map<String, String> entities = new HashMap<String, String>(10);
        entities.put("lt", "<");
        entities.put("gt", ">");
        entities.put("amp", "&");
        entities.put("apos", "'");
        entities.put("quot", "\"");
        return entities;
    }
}