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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements.  The ASF licenses this file to You
* under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License.
* You may obtain a copy of the License at
*
*     http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.  For additional information regarding
* copyright in this work, please see the NOTICE file in the top level
* directory of this distribution.
*/
package org.apache.abdera.util;

import org.apache.abdera.i18n.text.CharUtils;
import org.apache.abdera.i18n.text.Filter;

public class XmlUtil {

  public enum XMLVersion { 
    XML10, 
    XML11;
    private final Filter filter;
    XMLVersion() {
      this.filter = new XmlFilter(this);
    }
    public Filter filter() {
      return filter;
    }
  };
  
  private static class XmlFilter 
    implements Filter {
    private final XMLVersion version;
    XmlFilter(XMLVersion version) {
      this.version = version;
    }
    public boolean accept(int c) {
      return !restricted(version, c);
    }
  }
  
  // inversion set
  private static int[] RESTRICTED_SET_v1 = {
    0,   9,
    11, 13,
    14, 32,
    55296, 57344,
    65534, 65536
  };
  
  // inversion set
  private static int[] RESTRICTED_SET_v11 = {
    11, 13,
    14, 32,
    127, 160,
    55296, 57344,
    65534, 65536      
  };
  
  public static boolean restricted(XMLVersion version, char c) {
    return restricted(version,(int)c);
  }
  
  public static boolean restricted(XMLVersion version, int c) {
    return CharUtils.invset_contains(
      version == XMLVersion.XML10 ? 
        RESTRICTED_SET_v1 : 
        RESTRICTED_SET_v11, 
      c);
  }
  
  public static XMLVersion getVersion(String version) {
    return version == null ? XMLVersion.XML10 :
           version.equals("1.0") ? XMLVersion.XML10 :
           version.equals("1.1") ? XMLVersion.XML11 : 
           XMLVersion.XML10;
  }
}