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 /*
  * TeleStax, Open Source Cloud Communications
  * Copyright 2011-2016, TeleStax Inc. and individual contributors
  * by the @authors tag.
  *
  * This program is free software: you can redistribute it and/or modify
  * under the terms of the GNU Affero General Public License as
  * published by the Free Software Foundation; either version 3 of
  * the License, or (at your option) any later version.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU Affero General Public License for more details.
  *
  * You should have received a copy of the GNU Affero General Public License
  * along with this program.  If not, see 
  *
  * This file incorporates work covered by the following copyright and
  * permission notice:
  *
  *   JBoss, Home of Professional Open Source
  *   Copyright 2007-2011, Red Hat, Inc. and individual contributors
  *   by the @authors tag. See the copyright.txt in the distribution for a
  *   full listing of individual contributors.
  *
  *   This is free software; you can redistribute it and/or modify it
  *   under the terms of the GNU Lesser General Public License as
  *   published by the Free Software Foundation; either version 2.1 of
  *   the License, or (at your option) any later version.
  *
  *   This software is distributed in the hope that it will be useful,
  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  *   Lesser General Public License for more details.
  *
  *   You should have received a copy of the GNU Lesser General Public
  *   License along with this software; if not, write to the Free
  *   Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  *   02110-1301 USA, or see the FSF site: http://www.fsf.org.
  */

package org.jdiameter.client.impl.parser;
/*
 * https://jdiameter.dev.java.net/
 *
 * License: GPL v3
 *
 * e-mail: [email protected]
 *
 */

import java.net.InetAddress;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Date;
import java.util.Iterator;
import java.util.List;

import org.jdiameter.api.Avp;
import org.jdiameter.api.AvpSet;
import org.jdiameter.api.InternalException;
import org.jdiameter.api.URI;
import org.jdiameter.client.api.parser.ParseException;

/**
 *
 * @author [email protected]
 * @author  Alexandre Mendonca 
 * @author  Bartosz Baranowski 
 * @author  Grzegorz Figiel [ProIDS] 
 */
class AvpSetImpl implements AvpSet {

  // FIXME: by default 3588.4-1 says: 'M' should be set to true;
  // FIXME: by default 3588.x says: if grouped has at least on AVP with 'M' set, it also has to have 'M' set! - TODO: add backmapping.

  private static final long serialVersionUID = 1L;
  private static final ElementParser parser = new ElementParser();

  List avps = new ArrayList();

  AvpSetImpl() {

  }

  @Override
  public Avp getAvp(int avpCode) {
    for (Avp avp : this.avps) {
      if (avp.getCode() == avpCode) {
        return avp;
      }
    }
    return null;
  }

  @Override
  public Avp getAvpByIndex(int avpIndex) {
    return this.avps.get(avpIndex);
  }

  @Override
  public Avp getAvp(int avpCode, long vendorId) {
    for (Avp avp : this.avps) {
      if (avp.getCode() == avpCode && avp.getVendorId() == vendorId) {
        return avp;
      }
    }
    return null;
  }

  @Override
  public AvpSet getAvps(int avpCode) {
    AvpSet result = new AvpSetImpl();
    for (Avp avp : this.avps) {
      if (avp.getCode() == avpCode) {
        result.addAvp(avp);
      }
    }
    return result;
  }



  @Override
  public AvpSet getAvps(int avpCode, long vendorId) {
    AvpSet result = new AvpSetImpl();
    for (Avp avp : this.avps) {
      if (avp.getCode() == avpCode && avp.getVendorId() == vendorId) {
        result.addAvp(avp);
      }
    }
    return result;
  }

  @Override
  public int getAvpIndex(int avpCode) {
    for (Avp avp : this.avps) {
      if (avp.getCode() == avpCode) {
        return this.avps.indexOf(avp);
      }
    }
    return -1;
  }

  @Override
  public int getAvpIndex(int avpCode, long vendorId) {
    for (Avp avp : this.avps) {
      if (avp.getCode() == avpCode && avp.getVendorId() == vendorId) {
        return this.avps.indexOf(avp);
      }
    }
    return -1;
  }

  @Override
  public AvpSet removeAvp(int avpCode) {
    return removeAvp(avpCode, 0);
  }

  @Override
  public AvpSet removeAvp(int avpCode, long vendorId) {
    AvpSet result = new AvpSetImpl();
    //  for (Avp avp : this.avps) {
    //    if (avp.getCode() == avpCode) {
    //      result.addAvp(avp);
    //      this.avps.remove(avp);
    //    }
    //  }
    Iterator it = this.avps.iterator();
    while (it.hasNext()) {
      Avp avp = it.next();
      if (avp.getCode() == avpCode && avp.getVendorId() == vendorId) {
        result.addAvp(avp);
        it.remove();
      }
    }
    return result;
  }

  @Override
  public Avp removeAvpByIndex(int i) {
    return (i >= this.avps.size()) ? null : this.avps.remove(i);
  }

  @Override
  public Avp[] asArray() {
    return this.avps.toArray(new Avp[avps.size()]);
  }

  @Override
  public Avp addAvp(int avpCode, long value, boolean asUnsigned) {
    Avp res = new AvpImpl(avpCode, 0, 0, asUnsigned ? parser.intU32ToBytes(value) : parser.int64ToBytes(value));
    this.avps.add(res);
    return res;
  }

  @Override
  public Avp addAvp(int avpCode, long value, boolean mFlag, boolean pFlag, boolean asUnsigned) {
    int flags = ((mFlag ? 0x40 : 0) | (pFlag ? 0x20 : 0));
    Avp res = new AvpImpl(avpCode, flags , 0, asUnsigned ? parser.intU32ToBytes(value) : parser.int64ToBytes(value));
    this.avps.add(res);
    return res;
  }

  @Override
  public Avp addAvp(int avpCode, long value, long vndId, boolean mFlag, boolean pFlag, boolean asUnsigned) {
    int flags = ((vndId != 0 ? 0x80 : 0) | (mFlag ? 0x40 : 0) | (pFlag ? 0x20 : 0));
    Avp res = new AvpImpl(avpCode, flags, vndId, asUnsigned ? parser.intU32ToBytes(value) : parser.int64ToBytes(value));
    this.avps.add(res);
    return res;
  }

  @Override
  public void insertAvp(int index, Avp... avps) {
    this.avps.addAll(index, Arrays.asList(avps));
  }

  @Override
  public void insertAvp(int index, AvpSet avpSet) {
    this.avps.addAll(index, Arrays.asList(avpSet.asArray()));
  }

  @Override
  public Avp insertAvp(int index, int avpCode, long value, boolean asUnsigned) {
    Avp res = new AvpImpl(avpCode, 0, 0, asUnsigned ? parser.intU32ToBytes(value) : parser.int64ToBytes(value));
    this.avps.add(index, res);
    return res;
  }

  @Override
  public Avp insertAvp(int index, int avpCode, long value, boolean mFlag, boolean pFlag, boolean asUnsigned) {
    int flags = ((mFlag ? 0x40 : 0) | (pFlag ? 0x20 : 0));
    Avp res = new AvpImpl(avpCode, flags , 0, asUnsigned ? parser.intU32ToBytes(value) : parser.int64ToBytes(value));
    this.avps.add(index, res);
    return res;
  }

  @Override
  public Avp insertAvp(int index, int avpCode, long value, long vndId, boolean mFlag, boolean pFlag, boolean asUnsigned) {
    int flags = ((vndId != 0 ? 0x80 : 0) | (mFlag ? 0x40 : 0) | (pFlag ? 0x20 : 0));
    Avp res = new AvpImpl(avpCode, flags, vndId, asUnsigned ? parser.intU32ToBytes(value) : parser.int64ToBytes(value));
    this.avps.add(index, res);
    return res;
  }

  @Override
  public AvpSet insertGroupedAvp(int index, int avpCode) {
    AvpImpl res = new AvpImpl(avpCode, 0, 0, new byte[0]);
    res.groupedData = new AvpSetImpl();
    this.avps.add(index, res);
    return res.groupedData;
  }

  @Override
  public int size() {
    return this.avps.size();
  }

  @Override
  public void addAvp(AvpSet avpSet) {
    for (Avp a:avpSet) {
      avps.add(a);
    }
  }

  @Override
  public void addAvp(Avp... avps) {
    for (Avp a : avps) {
      // No need to clone AVP, right?
      // Avp res = new AvpImpl(a);
      if (a != null) {
        this.avps.add(a);
      }
    }
  }

  @Override
  public Avp addAvp(int avpCode, byte[] rawData) {
    Avp res = new AvpImpl(avpCode, 0, 0, rawData);
    this.avps.add(res);
    return res;
  }

  @Override
  public Avp addAvp(int avpCode, byte[] rawData, boolean mFlag, boolean pFlag) {
    int flags = ((mFlag ? 0x40 : 0) | (pFlag ? 0x20 : 0));
    Avp res = new AvpImpl(avpCode, flags , 0, rawData);
    this.avps.add(res);
    return res;
  }

  @Override
  public Avp addAvp(int avpCode, byte[] rawData, long vndId, boolean mFlag, boolean pFlag) {
    int flags = ((vndId != 0 ? 0x80 : 0) | (mFlag ? 0x40 : 0) | (pFlag ? 0x20 : 0));
    Avp res = new AvpImpl(avpCode, flags, vndId, rawData);
    this.avps.add(res);
    return res;
  }

  @Override
  public Avp addAvp(int avpCode, int value) {
    Avp res = new AvpImpl(avpCode, 0, 0, parser.int32ToBytes(value));
    this.avps.add(res);
    return res;
  }

  @Override
  public Avp addAvp(int avpCode, int value, boolean mFlag, boolean pFlag) {
    int flags = ((mFlag ? 0x40 : 0) | (pFlag ? 0x20 : 0));
    Avp res = new AvpImpl(avpCode, flags, 0, parser.int32ToBytes(value));
    this.avps.add(res);
    return res;
  }

  @Override
  public Avp addAvp(int avpCode, int value, long vndId, boolean mFlag, boolean pFlag) {
    int flags = ((vndId != 0 ? 0x80 : 0) | (mFlag ? 0x40 : 0) | (pFlag ? 0x20 : 0));
    Avp res = new AvpImpl(avpCode, flags, vndId, parser.int32ToBytes(value));
    this.avps.add(res);
    return res;
  }

  @Override
  public Avp addAvp(int avpCode, long value) {
    Avp res = new AvpImpl(avpCode, 0, 0, parser.int64ToBytes(value) );
    this.avps.add(res);
    return res;
  }

  @Override
  public Avp addAvp(int avpCode, long value, boolean mFlag, boolean pFlag) {
    int flags = ((mFlag ? 0x40 : 0) | (pFlag ? 0x20 : 0));
    Avp res = new AvpImpl(avpCode, flags, 0, parser.int64ToBytes(value) );
    this.avps.add(res);
    return res;
  }

  @Override
  public Avp addAvp(int avpCode, long value, long vndId, boolean mFlag, boolean pFlag) {
    int flags = ((vndId != 0 ? 0x80 : 0) | (mFlag ? 0x40 : 0) | (pFlag ? 0x20 : 0));
    Avp res = new AvpImpl(avpCode, flags, vndId, parser.int64ToBytes(value) );
    this.avps.add(res);
    return res;
  }

  @Override
  public Avp addAvp(int avpCode, float value) {
    Avp res = new AvpImpl(avpCode, 0, 0, parser.float32ToBytes(value));
    this.avps.add(res);
    return res;
  }

  @Override
  public Avp addAvp(int avpCode, float value, boolean mFlag, boolean pFlag) {
    int flags = ((mFlag ? 0x40 : 0) | (pFlag ? 0x20 : 0));
    Avp res = new AvpImpl(avpCode, flags, 0, parser.float32ToBytes(value));
    this.avps.add(res);
    return res;
  }

  @Override
  public Avp addAvp(int avpCode, float value, long vndId, boolean mFlag, boolean pFlag) {
    int flags = ((vndId != 0 ? 0x80 : 0) | (mFlag ? 0x40 : 0) | (pFlag ? 0x20 : 0));
    Avp res = new AvpImpl(avpCode, flags, vndId, parser.float32ToBytes(value));
    this.avps.add(res);
    return res;
  }

  @Override
  public Avp addAvp(int avpCode, double value) {
    Avp res = new AvpImpl(avpCode, 0, 0, parser.float64ToBytes(value));
    this.avps.add(res);
    return res;

  }

  @Override
  public Avp addAvp(int avpCode, double value, boolean mFlag, boolean pFlag) {
    int flags = ((mFlag ? 0x40 : 0) | (pFlag ? 0x20 : 0));
    Avp res = new AvpImpl(avpCode, flags, 0, parser.float64ToBytes(value));
    this.avps.add(res);
    return res;
  }

  @Override
  public Avp addAvp(int avpCode, double value, long vndId, boolean mFlag, boolean pFlag) {
    int flags = ((vndId != 0 ? 0x80 : 0) | (mFlag ? 0x40 : 0) | (pFlag ? 0x20 : 0));
    Avp res = new AvpImpl(avpCode, flags, vndId, parser.float64ToBytes(value));
    this.avps.add(res);
    return res;
  }

  @Override
  public Avp addAvp(int avpCode, String value, boolean asOctetString) {
    try {
      Avp res = new AvpImpl(avpCode, 0, 0, asOctetString ? parser.octetStringToBytes(value) : parser.utf8StringToBytes(value)
          );
      this.avps.add(res);
      return res;
    } catch (Exception e) {
      throw new IllegalArgumentException(e);
    }
  }

  @Override
  public Avp addAvp(int avpCode, String value, boolean mFlag, boolean pFlag,  boolean asOctetString) {
    int flags = ((mFlag ? 0x40 : 0) | (pFlag ? 0x20 : 0));
    try {
      Avp res = new AvpImpl(avpCode, flags, 0, asOctetString ? parser.octetStringToBytes(value) : parser.utf8StringToBytes(value)
          );
      this.avps.add(res);
      return res;
    } catch (Exception e) {
      throw new IllegalArgumentException(e);
    }
  }

  @Override
  public Avp addAvp(int avpCode, String value, long vndId, boolean mFlag, boolean pFlag,  boolean asOctetString) {
    int flags = ((vndId != 0 ? 0x80 : 0) | (mFlag ? 0x40 : 0) | (pFlag ? 0x20 : 0));
    try {
      Avp res = new AvpImpl(avpCode, flags, vndId, asOctetString ? parser.octetStringToBytes(value) : parser.utf8StringToBytes(value)
          );
      this.avps.add(res);
      return res;
    } catch (Exception e) {
      throw new IllegalArgumentException(e);
    }
  }

  @Override
  public Avp addAvp(int avpCode, URI value) {
    try {
      Avp res = new AvpImpl(avpCode, 0, 0, parser.octetStringToBytes(value.toString()));
      this.avps.add(res);
      return res;
    } catch (ParseException e) {
      throw new IllegalArgumentException(e);
    }
  }

  @Override
  public Avp addAvp(int avpCode, URI value, boolean mFlag, boolean pFlag) {
    int flags = ((mFlag ? 0x40 : 0) | (pFlag ? 0x20 : 0));
    try {
      Avp res = new AvpImpl(avpCode, flags, 0, parser.octetStringToBytes(value.toString()));
      this.avps.add(res);
      return res;
    } catch (ParseException e) {
      throw new IllegalArgumentException(e);
    }
  }

  @Override
  public Avp addAvp(int avpCode, URI value, long vndId, boolean mFlag, boolean pFlag) {
    int flags = ((vndId != 0 ? 0x80 : 0) | (mFlag ? 0x40 : 0) | (pFlag ? 0x20 : 0));
    try {
      Avp res = new AvpImpl(avpCode, flags, vndId, parser.octetStringToBytes(value.toString()));
      this.avps.add(res);
      return res;
    } catch (ParseException e) {
      throw new IllegalArgumentException(e);
    }
  }

  @Override
  public Avp addAvp(int avpCode, InetAddress value) {
    Avp res = new AvpImpl(avpCode, 0, 0, parser.addressToBytes(value));
    this.avps.add(res);
    return res;
  }

  @Override
  public Avp addAvp(int avpCode, InetAddress value, boolean mFlag, boolean pFlag) {
    int flags = ((mFlag ? 0x40 : 0) | (pFlag ? 0x20 : 0));
    Avp res = new AvpImpl(avpCode, flags, 0, parser.addressToBytes(value));
    this.avps.add(res);
    return res;
  }

  @Override
  public Avp addAvp(int avpCode, InetAddress value, long vndId, boolean mFlag, boolean pFlag) {
    int flags = ((vndId != 0 ? 0x80 : 0) | (mFlag ? 0x40 : 0) | (pFlag ? 0x20 : 0));
    Avp res = new AvpImpl(avpCode, flags, vndId, parser.addressToBytes(value));
    this.avps.add(res);
    return res;
  }

  @Override
  public Avp addAvp(int avpCode, Date value) {
    Avp res = new AvpImpl(avpCode, 0, 0, parser.dateToBytes(value));
    this.avps.add(res);
    return res;

  }

  @Override
  public Avp addAvp(int avpCode, Date value, boolean mFlag, boolean pFlag) {
    int flags = ((mFlag ? 0x40 : 0) | (pFlag ? 0x20 : 0));
    Avp res = new AvpImpl(avpCode, flags, 0, parser.dateToBytes(value));
    this.avps.add(res);
    return res;
  }

  @Override
  public Avp addAvp(int avpCode, Date value, long vndId, boolean mFlag, boolean pFlag) {
    int flags = ((vndId != 0 ? 0x80 : 0) | (mFlag ? 0x40 : 0) | (pFlag ? 0x20 : 0));
    Avp res = new AvpImpl(avpCode, flags, vndId, parser.dateToBytes(value));
    this.avps.add(res);
    return res;
  }

  @Override
  public AvpSet addGroupedAvp(int avpCode) {
    AvpImpl res = new AvpImpl(avpCode, 0, 0, new byte[0] );
    res.groupedData = new AvpSetImpl();
    this.avps.add(res);
    return res.groupedData;
  }

  @Override
  public AvpSet addGroupedAvp(int avpCode, boolean mFlag, boolean pFlag) {
    int flags = ((mFlag ? 0x40 : 0) | (pFlag ? 0x20 : 0));
    AvpImpl res = new AvpImpl(avpCode, flags, 0, new byte[0] );
    res.groupedData = new AvpSetImpl();
    this.avps.add(res);
    return res.groupedData;
  }

  @Override
  public AvpSet addGroupedAvp(int avpCode, long vndId, boolean mFlag, boolean pFlag) {
    int flags = ((vndId != 0 ? 0x80 : 0) | (mFlag ? 0x40 : 0) | (pFlag ? 0x20 : 0));
    AvpImpl res = new AvpImpl(avpCode, flags, vndId, new byte[0] );
    res.groupedData = new AvpSetImpl();
    this.avps.add(res);
    return res.groupedData;
  }

  @Override
  public Avp insertAvp(int index, int avpCode, byte[] value) {
    Avp res = new AvpImpl(avpCode, 0, 0, value);
    this.avps.add(index, res);
    return res;
  }

  @Override
  public Avp insertAvp(int index, int avpCode, byte[] value, boolean mFlag, boolean pFlag) {
    int flags = ((mFlag ? 0x40 : 0) | (pFlag ? 0x20 : 0));
    Avp res = new AvpImpl(avpCode, flags, 0, value);
    this.avps.add(index, res);
    return res;

  }

  @Override
  public Avp insertAvp(int index, int avpCode, byte[] value, long vndId, boolean mFlag, boolean pFlag) {
    int flags = ((vndId != 0 ? 0x80 : 0) | (mFlag ? 0x40 : 0) | (pFlag ? 0x20 : 0));
    Avp res = new AvpImpl(avpCode, flags, vndId, value);
    this.avps.add(index, res);
    return res;
  }

  @Override
  public Avp insertAvp(int index, int avpCode, int value) {
    Avp res = new AvpImpl(avpCode, 0, 0, parser.int32ToBytes(value));
    this.avps.add(index, res);
    return res;
  }

  @Override
  public Avp insertAvp(int index, int avpCode, int value, boolean mFlag, boolean pFlag) {
    int flags = ((mFlag ? 0x40 : 0) | (pFlag ? 0x20 : 0));
    Avp res = new AvpImpl(avpCode, flags, 0, parser.int32ToBytes(value));
    this.avps.add(index, res);
    return res;
  }

  @Override
  public Avp insertAvp(int index, int avpCode, int value, long vndId, boolean mFlag, boolean pFlag) {
    int flags = ((vndId != 0 ? 0x80 : 0) | (mFlag ? 0x40 : 0) | (pFlag ? 0x20 : 0));
    Avp res = new AvpImpl(avpCode, flags, vndId, parser.int32ToBytes(value));
    this.avps.add(index, res);
    return res;
  }

  @Override
  public Avp insertAvp(int index, int avpCode, long value) {
    Avp res = new AvpImpl(avpCode, 0, 0, parser.int64ToBytes(value));
    this.avps.add(index, res);
    return res;
  }

  @Override
  public Avp insertAvp(int index, int avpCode, long value, boolean mFlag, boolean pFlag) {
    int flags = ((mFlag ? 0x40 : 0) | (pFlag ? 0x20 : 0));
    Avp res = new AvpImpl(avpCode, flags, 0, parser.int64ToBytes(value));
    this.avps.add(index, res);
    return res;
  }

  @Override
  public Avp insertAvp(int index, int avpCode, long value, long vndId, boolean mFlag, boolean pFlag) {
    int flags = ((vndId != 0 ? 0x80 : 0) | (mFlag ? 0x40 : 0) | (pFlag ? 0x20 : 0));
    Avp res = new AvpImpl(avpCode, flags, vndId, parser.int64ToBytes(value));
    this.avps.add(index, res);
    return res;
  }

  @Override
  public Avp insertAvp(int index, int avpCode, float value) {
    Avp res = new AvpImpl(avpCode, 0, 0, parser.float32ToBytes(value));
    this.avps.add(index, res);
    return res;
  }

  @Override
  public Avp insertAvp(int index, int avpCode, float value, boolean mFlag, boolean pFlag) {
    int flags = ((mFlag ? 0x40 : 0) | (pFlag ? 0x20 : 0));
    Avp res = new AvpImpl(avpCode, flags, 0, parser.float32ToBytes(value));
    this.avps.add(index, res);
    return res;
  }

  @Override
  public Avp insertAvp(int index, int avpCode, float value, long vndId, boolean mFlag, boolean pFlag) {
    int flags = ((vndId != 0 ? 0x80 : 0) | (mFlag ? 0x40 : 0) | (pFlag ? 0x20 : 0));
    Avp res = new AvpImpl(avpCode, flags, vndId, parser.float32ToBytes(value));
    this.avps.add(index, res);
    return res;
  }

  @Override
  public Avp insertAvp(int index, int avpCode, double value) {
    Avp res = new AvpImpl(avpCode, 0, 0, parser.float64ToBytes(value));
    this.avps.add(index, res);
    return res;
  }

  @Override
  public Avp insertAvp(int index, int avpCode, double value, boolean mFlag, boolean pFlag) {
    int flags = ((mFlag ? 0x40 : 0) | (pFlag ? 0x20 : 0));
    Avp res = new AvpImpl(avpCode, flags, 0, parser.float64ToBytes(value));
    this.avps.add(index, res);
    return res;
  }

  @Override
  public Avp insertAvp(int index, int avpCode, double value, long vndId, boolean mFlag, boolean pFlag) {
    int flags = ((vndId != 0 ? 0x80 : 0) | (mFlag ? 0x40 : 0) | (pFlag ? 0x20 : 0));
    Avp res = new AvpImpl(avpCode, flags, vndId, parser.float64ToBytes(value));
    this.avps.add(index, res);
    return res;
  }

  @Override
  public Avp insertAvp(int index, int avpCode, String value, boolean asOctetString) {
    try {
      Avp res = new AvpImpl(avpCode, 0, 0, asOctetString ? parser.octetStringToBytes(value) :
          parser.utf8StringToBytes(value));
      this.avps.add(index, res);
      return res;
    } catch (Exception e) {
      throw new IllegalArgumentException(e);
    }
  }

  @Override
  public Avp insertAvp(int index, int avpCode, String value, boolean mFlag, boolean pFlag, boolean asOctetString) {
    int flags = ((mFlag ? 0x40 : 0) | (pFlag ? 0x20 : 0));
    try {
      Avp res = new AvpImpl(avpCode, flags, 0, asOctetString ? parser.octetStringToBytes(value) :
          parser.utf8StringToBytes(value));
      this.avps.add(index, res);
      return res;
    } catch (Exception e) {
      throw new IllegalArgumentException(e);
    }

  }

  @Override
  public Avp insertAvp(int index, int avpCode, String value, long vndId, boolean mFlag, boolean pFlag, boolean asOctetString) {
    int flags = ((vndId != 0 ? 0x80 : 0) | (mFlag ? 0x40 : 0) | (pFlag ? 0x20 : 0));
    try {
      Avp res = new AvpImpl(avpCode, flags, vndId, asOctetString ? parser.octetStringToBytes(value) :
          parser.utf8StringToBytes(value));
      this.avps.add(index, res);
      return res;
    } catch (Exception e) {
      throw new IllegalArgumentException(e);
    }
  }

  @Override
  public Avp insertAvp(int index, int avpCode, URI value) {
    try {
      Avp res = new AvpImpl(avpCode, 0, 0, parser.octetStringToBytes(value.toString()));
      this.avps.add(index, res);
      return res;
    } catch (Exception e) {
      throw new IllegalArgumentException(e);
    }
  }

  @Override
  public Avp insertAvp(int index, int avpCode, URI value, boolean mFlag, boolean pFlag) {
    int flags = ((mFlag ? 0x40 : 0) | (pFlag ? 0x20 : 0));
    try {
      Avp res = new AvpImpl(avpCode, flags, 0, parser.octetStringToBytes(value.toString()));
      this.avps.add(index, res);
      return res;
    } catch (Exception e) {
      throw new IllegalArgumentException(e);
    }
  }

  @Override
  public Avp insertAvp(int index, int avpCode, URI value, long vndId, boolean mFlag, boolean pFlag) {
    int flags = ((vndId != 0 ? 0x80 : 0) | (mFlag ? 0x40 : 0) | (pFlag ? 0x20 : 0));
    try {
      Avp res = new AvpImpl(avpCode, flags, vndId, parser.octetStringToBytes(value.toString()));
      this.avps.add(index, res);
      return res;
    } catch (Exception e) {
      throw new IllegalArgumentException(e);
    }
  }

  @Override
  public Avp insertAvp(int index, int avpCode, InetAddress value) {
    Avp res = new AvpImpl(avpCode, 0, 0, parser.addressToBytes(value));
    this.avps.add(index, res);
    return res;
  }

  @Override
  public Avp insertAvp(int index, int avpCode, InetAddress value, boolean mFlag, boolean pFlag) {
    int flags = ((mFlag ? 0x40 : 0) | (pFlag ? 0x20 : 0));
    Avp res = new AvpImpl(avpCode, flags, 0, parser.addressToBytes(value));
    this.avps.add(index, res);
    return res;
  }

  @Override
  public Avp insertAvp(int index, int avpCode, InetAddress value, long vndId, boolean mFlag, boolean pFlag) {
    int flags = ((vndId != 0 ? 0x80 : 0) | (mFlag ? 0x40 : 0) | (pFlag ? 0x20 : 0));
    Avp res = new AvpImpl(avpCode, flags, vndId, parser.addressToBytes(value));
    this.avps.add(index, res);
    return res;
  }

  @Override
  public Avp insertAvp(int index, int avpCode, Date value) {
    Avp res = new AvpImpl(avpCode, 0, 0, parser.dateToBytes(value));
    this.avps.add(index, res);
    return res;
  }

  @Override
  public Avp insertAvp(int index, int avpCode, Date value, boolean mFlag, boolean pFlag) {
    int flags = ((mFlag ? 0x40 : 0) | (pFlag ? 0x20 : 0));
    Avp res = new AvpImpl(avpCode, flags, 0, parser.dateToBytes(value));
    this.avps.add(index, res);
    return res;
  }

  @Override
  public Avp insertAvp(int index, int avpCode, Date value, long vndId, boolean mFlag, boolean pFlag) {
    int flags = ((vndId != 0 ? 0x80 : 0) | (mFlag ? 0x40 : 0) | (pFlag ? 0x20 : 0));
    Avp res = new AvpImpl(avpCode, flags, vndId, parser.dateToBytes(value));
    this.avps.add(index, res);
    return res;
  }

  @Override
  public AvpSet insertGroupedAvp(int index, int avpCode, boolean mFlag, boolean pFlag) {
    int flags = ((mFlag ? 0x40 : 0) | (pFlag ? 0x20 : 0));
    AvpImpl res = new AvpImpl(avpCode, flags, 0, new byte[0] );
    res.groupedData = new AvpSetImpl();
    this.avps.add(index, res);
    return res.groupedData;
  }

  @Override
  public AvpSet insertGroupedAvp(int index, int avpCode, long vndId, boolean mFlag, boolean pFlag) {
    int flags = ((vndId != 0 ? 0x80 : 0) | (mFlag ? 0x40 : 0) | (pFlag ? 0x20 : 0));
    AvpImpl res = new AvpImpl(avpCode, flags, vndId, new byte[0] );
    res.groupedData = new AvpSetImpl();
    this.avps.add(index, res);
    return res.groupedData;
  }

  @Override
  public boolean isWrapperFor(Class aClass) throws InternalException {
    return false;
  }

  @Override
  public  T unwrap(Class aClass) throws InternalException {
    return null;
  }

  @Override
  public Iterator iterator() {
    // Iterator contract demands it to be able to remove items
    // return Collections.unmodifiableList(this.avps).iterator();
    return this.avps.iterator();
  }

  @Override
  public String toString() {
    return new StringBuffer("AvpSetImpl [avps=").append(avps).append("]@").append(super.hashCode()).toString();
  }
}