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 /*

  * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

  *

  * This code is free software; you can redistribute it and/or modify it

  * under the terms of the GNU General Public License version 2 only, as

  * published by the Free Software Foundation.  Oracle designates this

  * particular file as subject to the "Classpath" exception as provided

  * by Oracle in the LICENSE file that accompanied this code.

  *

  * This code 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 General Public License

  * version 2 for more details (a copy is included in the LICENSE file that

  * accompanied this code).

  *

  * You should have received a copy of the GNU General Public License version

  * 2 along with this work; if not, write to the Free Software Foundation,

  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

  *

  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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 package com.sun.xml.internal.ws.api.message;

 import java.util.ArrayList;

 import java.util.BitSet;

 import java.util.HashSet;

 import java.util.Iterator;

 import java.util.List;

 import java.util.NoSuchElementException;

 import java.util.Set;

 import javax.xml.namespace.QName;

 import javax.xml.ws.WebServiceException;

 import com.sun.istack.internal.NotNull;

 import com.sun.istack.internal.Nullable;

 import com.sun.xml.internal.ws.api.SOAPVersion;

 import com.sun.xml.internal.ws.api.WSBinding;

 import com.sun.xml.internal.ws.api.addressing.AddressingVersion;

 import com.sun.xml.internal.ws.api.addressing.WSEndpointReference;

 import com.sun.xml.internal.ws.api.model.wsdl.WSDLPort;

 import com.sun.xml.internal.ws.api.pipe.Codec;

 import com.sun.xml.internal.ws.api.pipe.Pipe;

 import com.sun.xml.internal.ws.binding.SOAPBindingImpl;

 import com.sun.xml.internal.ws.protocol.soap.ClientMUTube;

 import com.sun.xml.internal.ws.protocol.soap.ServerMUTube;

 import java.util.Arrays;

 /**

  * A list of {@link Header}s on a {@link Message}.

  *

  * <p>

  * This list can be modified to add headers

  * from outside a {@link Message}, this is necessary

  * since intermediate processing layers often need to

  * put additional headers.

  *

  * <p>

  * Following the SOAP convention, the order among headers

  * are not significant. However, {@link Codec}s are

  * expected to preserve the order of headers in the input

  * message as much as possible.

  *

  *

  * <a name="MU"></a>

  * <h3>MustUnderstand Processing</h3>

  * <p>

  * To perform SOAP mustUnderstang processing correctly, we need to keep

  * track of headers that are understood and headers that are not.

  * This is a collaborative process among {@link Pipe}s, thus it's something

  * a {@link Pipe} author needs to keep in mind.

  *

  * <p>

  * Specifically, when a {@link Pipe} sees a header and processes it

  * (that is, if it did enough computing with the header to claim that

  * the header is understood), then it should mark the corresponding

  * header as "understood". For example, when a pipe that handles JAX-WSA

  * examins the <wsa:To> header, it can claim that it understood the header.

  * But for example, if a pipe that does the signature verification checks

  * <wsa:To> for a signature, that would not be considered as "understood".

  *

  * <p>

  * There are two ways to mark a header as understood:

  *

  * <ol>

  *  <li>Use one of the <tt>getXXX</tt> methods that take a

  *      boolean <tt>markAsUnderstood</tt> parameter.

  *      Most often, a {@link Pipe} knows it's going to understand a header

  *      as long as it's present, so this is the easiest and thus the preferred way.

  *

  *      For example, if JAX-WSA looks for <wsa:To>, then it can set

  *      <tt>markAsUnderstand</tt> to true, to do the obtaining of a header

  *      and marking at the same time.

  *

  *  <li>Call {@link #understood(int)}.

  *      If under a rare circumstance, a pipe cannot determine whether

  *      it can understand it or not when you are fetching a header, then

  *      you can use this method afterward to mark it as understood.

  * </ol>

  *

  * <p>

  * Intuitively speaking, at the end of the day, if a header is not

  * understood but {@link Header#isIgnorable(SOAPVersion, java.util.Set)} is false, a bad thing

  * will happen. The actual implementation of the checking is more complicated,

  * for that see {@link ClientMUTube}/{@link ServerMUTube}.

  *

  * @see Message#getHeaders()

  */

 public class HeaderList extends ArrayList<Header> implements MessageHeaders {

     private static final long serialVersionUID = -6358045781349627237L;

     /**

      * Bit set to keep track of which headers are understood.

      * <p>

      * The first 32 headers use this field, and the rest will use

      * {@link #moreUnderstoodBits}. The expectation is that

      * most of the time a SOAP message will only have up to 32 headers,

      * so we can avoid allocating separate objects for {@link BitSet}.

      */

     private int understoodBits;

     /**

      * If there are more than 32 headers, we use this {@link BitSet}

      * to keep track of whether those headers are understood.

      * Lazily allocated.

      */

     private BitSet moreUnderstoodBits = null;

     private SOAPVersion soapVersion;

     /**

      * This method is deprecated - instead use this one:

      * public HeaderList(SOAPVersion)

      * Creates an empty {@link HeaderList}.

      */

     @Deprecated

     public HeaderList() {

     }

     /**

      * Creates an empty {@link HeaderList} with the given soap version

      * @param soapVersion

      */

     public HeaderList(SOAPVersion soapVersion) {

         this.soapVersion = soapVersion;

     }

     /**

      * Copy constructor.

      */

     public HeaderList(HeaderList that) {

         super(that);

         this.understoodBits = that.understoodBits;

         if (that.moreUnderstoodBits != null) {

             this.moreUnderstoodBits = (BitSet) that.moreUnderstoodBits.clone();

         }

     }

     public HeaderList(MessageHeaders that) {

         super(that.asList());

         if (that instanceof HeaderList) {

             HeaderList hThat = (HeaderList) that;

             this.understoodBits = hThat.understoodBits;

             if (hThat.moreUnderstoodBits != null) {

                 this.moreUnderstoodBits = (BitSet) hThat.moreUnderstoodBits.clone();

             }

         } else {

             Set<QName> understood = that.getUnderstoodHeaders();

             if (understood != null) {

                 for (QName qname : understood) {

                     understood(qname);

                 }

             }

         }

     }

     /**

      * The total number of headers.

      */

     @Override

     public int size() {

         return super.size();

     }

     @Override

     public boolean hasHeaders() {

         return !isEmpty();

     }

     /**

      * Adds all the headers.

      * @deprecated throws UnsupportedOperationException from some HeaderList implementations - better iterate over items one by one

      */

     @Deprecated

     public void addAll(Header... headers) {

         addAll(Arrays.asList(headers));

     }

     /**

      * Gets the {@link Header} at the specified index.

      *

      * <p>

      * This method does not mark the returned {@link Header} as understood.

      *

      * @see #understood(int)

      */

     @Override

     public Header get(int index) {

         return super.get(index);

     }

     /**

      * Marks the {@link Header} at the specified index as

      * <a href="#MU">"understood"</a>.

      */

     public void understood(int index) {

         // check that index is in range

         if (index >= size()) {

             throw new ArrayIndexOutOfBoundsException(index);

         }

         if (index < 32) {

             understoodBits |= 1 << index;

         } else {

             if (moreUnderstoodBits == null) {

                 moreUnderstoodBits = new BitSet();

             }

             moreUnderstoodBits.set(index - 32);

         }

     }

     /**

      * Returns true if a {@link Header} at the given index

      * was <a href="#MU">"understood"</a>.

      */

     public boolean isUnderstood(int index) {

         // check that index is in range

         if (index >= size()) {

             throw new ArrayIndexOutOfBoundsException(index);

         }

         if (index < 32) {

             return understoodBits == (understoodBits | (1 << index));

         } else {

             if (moreUnderstoodBits == null) {

                 return false;

             }

             return moreUnderstoodBits.get(index - 32);

         }

     }

     /**

      * Marks the specified {@link Header} as <a href="#MU">"understood"</a>.

      *

      * @deprecated

      * By the definition of {@link ArrayList}, this operation requires

      * O(n) search of the array, and thus inherently inefficient.

      *

      * Because of this, if you are developing a {@link Pipe} for

      * a performance sensitive environment, do not use this method.

      *

      * @throws IllegalArgumentException

      *      if the given header is not {@link #contains(Object) contained}

      *      in this header.

      */

     @Override

     public void understood(@NotNull Header header) {

         int sz = size();

         for (int i = 0; i < sz; i++) {

             if (get(i) == header) {

                 understood(i);

                 return;

             }

         }

         throw new IllegalArgumentException();

     }

     /**

      * Gets the first {@link Header} of the specified name.

      *

      * @param markAsUnderstood

      *      If this parameter is true, the returned header will

      *      be marked as <a href="#MU">"understood"</a>.

      * @return null if not found.

      */

     @Override

     public @Nullable Header get(@NotNull String nsUri, @NotNull String localName, boolean markAsUnderstood) {

         int len = size();

         for (int i = 0; i < len; i++) {

             Header h = get(i);

             if (h.getLocalPart().equals(localName) && h.getNamespaceURI().equals(nsUri)) {

                 if (markAsUnderstood) {

                     understood(i);

                 }

                 return h;

             }

         }

         return null;

     }

     /**

      * @deprecated

      *      Use {@link #get(String, String, boolean)}

      */

     public Header get(String nsUri, String localName) {

         return get(nsUri, localName, true);

     }

     /**

      * Gets the first {@link Header} of the specified name.

      *

      * @param markAsUnderstood

      *      If this parameter is true, the returned header will

      *      be marked as <a href="#MU">"understood"</a>.

      * @return null

      *      if not found.

      */

     @Override

     public @Nullable Header get(@NotNull QName name, boolean markAsUnderstood) {

         return get(name.getNamespaceURI(), name.getLocalPart(), markAsUnderstood);

     }

     /**

      * @deprecated

      *      Use {@link #get(QName)}

      */

     public

     @Nullable

     Header get(@NotNull QName name) {

         return get(name, true);

     }

     /**

      * @deprecated

      *      Use {@link #getHeaders(String, String, boolean)}

      */

     public Iterator<Header> getHeaders(final String nsUri, final String localName) {

         return getHeaders(nsUri, localName, true);

     }

     /**

      * Gets all the {@link Header}s of the specified name,

      * including duplicates (if any.)

      *

      * @param markAsUnderstood

      *      If this parameter is true, the returned headers will

      *      be marked as <a href="#MU">"understood"</a> when they are returned

      *      from {@link Iterator#next()}.

      * @return empty iterator if not found.

      */

     public

     @NotNull

     @Override

     Iterator<Header> getHeaders(@NotNull final String nsUri, @NotNull final String localName, final boolean markAsUnderstood) {

         return new Iterator<Header>() {

             int idx = 0;

             Header next;

             @Override

             public boolean hasNext() {

                 if (next == null) {

                     fetch();

                 }

                 return next != null;

             }

             @Override

             public Header next() {

                 if (next == null) {

                     fetch();

                     if (next == null) {

                         throw new NoSuchElementException();

                     }

                 }

                 if (markAsUnderstood) {

                     assert get(idx - 1) == next;

                     understood(idx - 1);

                 }

                 Header r = next;

                 next = null;

                 return r;

             }

             private void fetch() {

                 while (idx < size()) {

                     Header h = get(idx++);

                     if (h.getLocalPart().equals(localName) && h.getNamespaceURI().equals(nsUri)) {

                         next = h;

                         break;

                     }

                 }

             }

             @Override

             public void remove() {

                 throw new UnsupportedOperationException();

             }

         };

     }

     /**

      * @see #getHeaders(String, String, boolean)

      */

     public

     @NotNull

     @Override

     Iterator<Header> getHeaders(@NotNull QName headerName, final boolean markAsUnderstood) {

         return getHeaders(headerName.getNamespaceURI(), headerName.getLocalPart(), markAsUnderstood);

     }

     /**

      * @deprecated

      *      use {@link #getHeaders(String, boolean)}.

      */

     public

     @NotNull

     Iterator<Header> getHeaders(@NotNull final String nsUri) {

         return getHeaders(nsUri, true);

     }

     /**

      * Gets an iteration of headers {@link Header} in the specified namespace,

      * including duplicates (if any.)

      *

      * @param markAsUnderstood

      *      If this parameter is true, the returned headers will

      *      be marked as <a href="#MU">"understood"</a> when they are returned

      *      from {@link Iterator#next()}.

      * @return

      *      empty iterator if not found.

      */

     public

     @NotNull

     @Override

     Iterator<Header> getHeaders(@NotNull final String nsUri, final boolean markAsUnderstood) {

         return new Iterator<Header>() {

             int idx = 0;

             Header next;

             @Override

             public boolean hasNext() {

                 if (next == null) {

                     fetch();

                 }

                 return next != null;

             }

             @Override

             public Header next() {

                 if (next == null) {

                     fetch();

                     if (next == null) {

                         throw new NoSuchElementException();

                     }

                 }

                 if (markAsUnderstood) {

                     assert get(idx - 1) == next;

                     understood(idx - 1);

                 }

                 Header r = next;

                 next = null;

                 return r;

             }

             private void fetch() {

                 while (idx < size()) {

                     Header h = get(idx++);

                     if (h.getNamespaceURI().equals(nsUri)) {

                         next = h;

                         break;

                     }

                 }

             }

             @Override

             public void remove() {

                 throw new UnsupportedOperationException();

             }

         };

     }

     /**

      * Returns the value of WS-Addressing <code>To</code> header. The <code>version</code>

      * identifies the WS-Addressing version and the header returned is targeted at

      * the current implicit role. Caches the value for subsequent invocation.

      * Duplicate <code>To</code> headers are detected earlier.

      *

      * @param av WS-Addressing version

      * @param sv SOAP version

      * @throws IllegalArgumentException if either <code>av</code> or <code>sv</code> is null.

      * @return Value of WS-Addressing To header, anonymous URI if no header is present

      */

     public String getTo(AddressingVersion av, SOAPVersion sv) {

         return AddressingUtils.getTo(this, av, sv);

     }

     /**

      * Returns the value of WS-Addressing <code>Action</code> header. The <code>version</code>

      * identifies the WS-Addressing version and the header returned is targeted at

      * the current implicit role. Caches the value for subsequent invocation.

      * Duplicate <code>Action</code> headers are detected earlier.

      *

      * @param av WS-Addressing version

      * @param sv SOAP version

      * @throws IllegalArgumentException if either <code>av</code> or <code>sv</code> is null.

      * @return Value of WS-Addressing Action header, null if no header is present

      */

     public String getAction(@NotNull AddressingVersion av, @NotNull SOAPVersion sv) {

         return AddressingUtils.getAction(this, av, sv);

     }

     /**

      * Returns the value of WS-Addressing <code>ReplyTo</code> header. The <code>version</code>

      * identifies the WS-Addressing version and the header returned is targeted at

      * the current implicit role. Caches the value for subsequent invocation.

      * Duplicate <code>ReplyTo</code> headers are detected earlier.

      *

      * @param av WS-Addressing version

      * @param sv SOAP version

      * @throws IllegalArgumentException if either <code>av</code> or <code>sv</code> is null.

      * @return Value of WS-Addressing ReplyTo header, null if no header is present

      */

     public WSEndpointReference getReplyTo(@NotNull AddressingVersion av, @NotNull SOAPVersion sv) {

         return AddressingUtils.getReplyTo(this, av, sv);

     }

     /**

      * Returns the value of WS-Addressing <code>FaultTo</code> header. The <code>version</code>

      * identifies the WS-Addressing version and the header returned is targeted at

      * the current implicit role. Caches the value for subsequent invocation.

      * Duplicate <code>FaultTo</code> headers are detected earlier.

      *

      * @param av WS-Addressing version

      * @param sv SOAP version

      * @throws IllegalArgumentException if either <code>av</code> or <code>sv</code> is null.

      * @return Value of WS-Addressing FaultTo header, null if no header is present

      */

     public WSEndpointReference getFaultTo(@NotNull AddressingVersion av, @NotNull SOAPVersion sv) {

         return AddressingUtils.getFaultTo(this, av, sv);

     }

     /**

      * Returns the value of WS-Addressing <code>MessageID</code> header. The <code>version</code>

      * identifies the WS-Addressing version and the header returned is targeted at

      * the current implicit role. Caches the value for subsequent invocation.

      * Duplicate <code>MessageID</code> headers are detected earlier.

      *

      * @param av WS-Addressing version

      * @param sv SOAP version

      * @throws WebServiceException if either <code>av</code> or <code>sv</code> is null.

      * @return Value of WS-Addressing MessageID header, null if no header is present

      */

     public String getMessageID(@NotNull AddressingVersion av, @NotNull SOAPVersion sv) {

         return AddressingUtils.getMessageID(this, av, sv);

     }

     /**

      * Returns the value of WS-Addressing <code>RelatesTo</code> header. The <code>version</code>

      * identifies the WS-Addressing version and the header returned is targeted at

      * the current implicit role. Caches the value for subsequent invocation.

      * Duplicate <code>RelatesTo</code> headers are detected earlier.

      *

      * @param av WS-Addressing version

      * @param sv SOAP version

      * @throws WebServiceException if either <code>av</code> or <code>sv</code> is null.

      * @return Value of WS-Addressing RelatesTo header, null if no header is present

      */

     public String getRelatesTo(@NotNull AddressingVersion av, @NotNull SOAPVersion sv) {

         return AddressingUtils.getRelatesTo(this, av, sv);

     }

     /**

      * Creates a set of outbound WS-Addressing headers on the client with the

      * specified Action Message Addressing Property value.

      * <p><p>

      * This method needs to be invoked right after such a Message is

      * created which is error prone but so far only MEX, RM and JAX-WS

      * creates a request so this ugliness is acceptable. This method is also used

      * to create protocol messages that are not associated with any {@link WSBinding}

      * and {@link WSDLPort}.

      *

      * @param packet request packet

      * @param av WS-Addressing version

      * @param sv SOAP version

      * @param oneway Indicates if the message exchange pattern is oneway

      * @param action Action Message Addressing Property value

      * @param mustUnderstand to indicate if the addressing headers are set with mustUnderstand attribute

      */

     public void fillRequestAddressingHeaders(Packet packet, AddressingVersion av, SOAPVersion sv, boolean oneway, String action, boolean mustUnderstand) {

         AddressingUtils.fillRequestAddressingHeaders(this, packet, av, sv, oneway, action, mustUnderstand);

     }

     public void fillRequestAddressingHeaders(Packet packet, AddressingVersion av, SOAPVersion sv, boolean oneway, String action) {

         AddressingUtils.fillRequestAddressingHeaders(this, packet, av, sv, oneway, action);

     }

     /**

      * Creates a set of outbound WS-Addressing headers on the client with the

      * default Action Message Addressing Property value.

      * <p><p>

      * This method needs to be invoked right after such a Message is

      * created which is error prone but so far only MEX, RM and JAX-WS

      * creates a request so this ugliness is acceptable. If more components

      * are identified using this, then we may revisit this.

      * <p><p>

      * This method is used if default Action Message Addressing Property is to

      * be used. See

      * {@link #fillRequestAddressingHeaders(Packet, com.sun.xml.internal.ws.api.addressing.AddressingVersion, com.sun.xml.internal.ws.api.SOAPVersion, boolean, String)}

      * if non-default Action is to be used, for example when creating a protocol message not

      * associated with {@link WSBinding} and {@link WSDLPort}.

      * This method uses SOAPAction as the Action unless set expplicitly in the wsdl.

      * @param wsdlPort request WSDL port

      * @param binding request WSBinding

      * @param packet request packet

      */

     public void fillRequestAddressingHeaders(WSDLPort wsdlPort, @NotNull WSBinding binding, Packet packet) {

         AddressingUtils.fillRequestAddressingHeaders(this, wsdlPort, binding, packet);

     }

     /**

      * Adds a new {@link Header}.

      *

      * <p>

      * Order doesn't matter in headers, so this method

      * does not make any guarantee as to where the new header

      * is inserted.

      *

      * @return

      *      always true. Don't use the return value.

      */

     @Override

     public boolean add(Header header) {

         return super.add(header);

     }

     /**

      * Removes the first {@link Header} of the specified name.

      * @param nsUri namespace URI of the header to remove

      * @param localName local part of the FQN of the header to remove

      *

      * @return null if not found.

      */

     public

     @Nullable

     @Override

     Header remove(@NotNull String nsUri, @NotNull String localName) {

         int len = size();

         for (int i = 0; i < len; i++) {

             Header h = get(i);

             if (h.getLocalPart().equals(localName) && h.getNamespaceURI().equals(nsUri)) {

                 return remove(i);

             }

         }

         return null;

     }

     /**

      * Replaces an existing {@link Header} or adds a new {@link Header}.

      *

      * <p>

      * Order doesn't matter in headers, so this method

      * does not make any guarantee as to where the new header

      * is inserted.

      *

      * @return

      *      always true. Don't use the return value.

      */

     @Override

     public boolean addOrReplace(Header header) {

         for (int i=0; i < size(); i++) {

           Header hdr = get(i);

           if (hdr.getNamespaceURI().equals(header.getNamespaceURI()) &&

               hdr.getLocalPart().equals(header.getLocalPart())) {

             // Put the new header in the old position. Call super versions

             // internally to avoid UnsupportedOperationException

             removeInternal(i);

             addInternal(i, header);

             return true;

           }

         }

         return add(header);

     }

     @Override

     public void replace(Header old, Header header) {

         for (int i=0; i < size(); i++) {

             Header hdr = get(i);

             if (hdr.getNamespaceURI().equals(header.getNamespaceURI()) &&

                 hdr.getLocalPart().equals(header.getLocalPart())) {

               // Put the new header in the old position. Call super versions

               // internally to avoid UnsupportedOperationException

               removeInternal(i);

               addInternal(i, header);

               return;

             }

           }

           throw new IllegalArgumentException();

     }

     protected void addInternal(int index, Header header) {

         super.add(index, header);

     }

     protected Header removeInternal(int index) {

         return super.remove(index);

     }

     /**

      * Removes the first {@link Header} of the specified name.

      *

      * @param name fully qualified name of the header to remove

      *

      * @return null if not found.

      */

     public

     @Nullable

     @Override

     Header remove(@NotNull QName name) {

         return remove(name.getNamespaceURI(), name.getLocalPart());

     }

     /**

      * Removes the first {@link Header} of the specified name.

      *

      * @param index index of the header to remove

      *

      * @return removed header

      */

     @Override

     public Header remove(int index) {

         removeUnderstoodBit(index);

         return super.remove(index);

     }

     /**

      * Removes the "understood" bit for header on the position specified by {@code index} parameter

      * from the set of understood header bits.

      *

      * @param index position of the bit to remove

      */

     private void removeUnderstoodBit(int index) {

         assert index < size();

         if (index < 32) {

             /**

              * Let

              *   R be the bit to be removed

              *   M be a more significant "upper" bit than bit R

              *   L be a less significant "lower" bit than bit R

              *

              * Then following 3 lines of code produce these results:

              *

              *   old understoodBits = MMMMMMMMMMMMRLLLLLLLLLLLLLLLLLLL

              *

              *   shiftedUpperBits   = 0MMMMMMMMMMMM0000000000000000000

              *

              *   lowerBits          = 0000000000000LLLLLLLLLLLLLLLLLLL

              *

              *   new understoodBits = 0MMMMMMMMMMMMLLLLLLLLLLLLLLLLLLL

              *

              * The R bit is removed and all the upper bits are shifted right (unsigned)

              */

             int shiftedUpperBits = understoodBits >>> -31 + index << index;

             int lowerBits = understoodBits << -index >>> 31 - index >>> 1;

             understoodBits = shiftedUpperBits | lowerBits;

             if (moreUnderstoodBits != null && moreUnderstoodBits.cardinality() > 0) {

                 if (moreUnderstoodBits.get(0)) {

                     understoodBits |= 0x80000000;

                 }

                 moreUnderstoodBits.clear(0);

                 for (int i = moreUnderstoodBits.nextSetBit(1); i > 0; i = moreUnderstoodBits.nextSetBit(i + 1)) {

                     moreUnderstoodBits.set(i - 1);

                     moreUnderstoodBits.clear(i);

                 }

             }

         } else if (moreUnderstoodBits != null && moreUnderstoodBits.cardinality() > 0) {

             index -= 32;

             moreUnderstoodBits.clear(index);

             for (int i = moreUnderstoodBits.nextSetBit(index); i >= 1; i = moreUnderstoodBits.nextSetBit(i + 1)) {

                 moreUnderstoodBits.set(i - 1);

                 moreUnderstoodBits.clear(i);

             }

         }

         // remove bit set if the new size will be < 33 => we fit all bits into int

         if (size() - 1 <= 33 && moreUnderstoodBits != null) {

             moreUnderstoodBits = null;

         }

     }

     /**

      * Removes a single instance of the specified element from this

      * header list, if it is present.  More formally,

      * removes a header <tt>h</tt> such that <tt>(o==null ? h==null :

      * o.equals(h))</tt>, if the header list contains one or more such

      * headers.  Returns <tt>true</tt> if the list contained the

      * specified element (or equivalently, if the list changed as a

      * result of the call).<p>

      *

      * @param o element to be removed from this list, if present.

      * @return <tt>true</tt> if the list contained the specified element.

      * @see #remove(javax.xml.namespace.QName)

      */

     @Override

     public boolean remove(Object o) {

         if (o != null) {

             for (int index = 0; index < this.size(); index++) {

                 if (o.equals(this.get(index))) {

                     remove(index);

                     return true;

                 }

             }

         }

         return false;

     }

     public Header remove(Header h) {

         if (remove((Object) h)) {

             return h;

         } else {

             return null;

         }

     }

     /**

      * Creates a copy.

      *

      * This handles null {@link HeaderList} correctly.

      *

      * @param original

      *      Can be null, in which case null will be returned.

      */

     public static HeaderList copy(MessageHeaders original) {

         if (original == null) {

             return null;

         } else {

             return new HeaderList(original);

         }

     }

     /**

      * Creates a copy.

      *

      * This handles null {@link HeaderList} correctly.

      *

      * @param original

      *      Can be null, in which case null will be returned.

      */

     public static HeaderList copy(HeaderList original) {

         return copy((MessageHeaders) original);

     }

     public void readResponseAddressingHeaders(WSDLPort wsdlPort, WSBinding binding) {

         // read Action

 //        String wsaAction = getAction(binding.getAddressingVersion(), binding.getSOAPVersion());

         // TODO: validate client-inbound Action

     }

     @Override

     public void understood(QName name) {

        get(name, true);

     }

     @Override

     public void understood(String nsUri, String localName) {

         get(nsUri, localName, true);

     }

     @Override

     public Set<QName> getUnderstoodHeaders() {

         Set<QName> understoodHdrs = new HashSet<QName>();

         for (int i = 0; i < size(); i++) {

             if (isUnderstood(i)) {

                 Header header = get(i);

                 understoodHdrs.add(new QName(header.getNamespaceURI(), header.getLocalPart()));

             }

         }

         return understoodHdrs;

 //        throw new UnsupportedOperationException("getUnderstoodHeaders() is not implemented by HeaderList");

     }

     @Override

     public boolean isUnderstood(Header header) {

         return isUnderstood(header.getNamespaceURI(), header.getLocalPart());

     }

     @Override

     public boolean isUnderstood(String nsUri, String localName) {

         for (int i = 0; i < size(); i++) {

             Header h = get(i);

             if (h.getLocalPart().equals(localName) && h.getNamespaceURI().equals(nsUri)) {

                 return isUnderstood(i);

             }

         }

         return false;

     }

     @Override

     public boolean isUnderstood(QName name) {

         return isUnderstood(name.getNamespaceURI(), name.getLocalPart());

     }

     @Override

     public Set<QName> getNotUnderstoodHeaders(Set<String> roles, Set<QName> knownHeaders, WSBinding binding) {

         Set<QName> notUnderstoodHeaders = null;

         if (roles == null) {

             roles = new HashSet<String>();

         }

         SOAPVersion effectiveSoapVersion = getEffectiveSOAPVersion(binding);

         roles.add(effectiveSoapVersion.implicitRole);

         for (int i = 0; i < size(); i++) {

             if (!isUnderstood(i)) {

                 Header header = get(i);

                 if (!header.isIgnorable(effectiveSoapVersion, roles)) {

                     QName qName = new QName(header.getNamespaceURI(), header.getLocalPart());

                     if (binding == null) {

                         //if binding is null, no further checks needed...we already

                         //know this header is not understood from the isUnderstood

                         //check above

                         if (notUnderstoodHeaders == null) {

                             notUnderstoodHeaders = new HashSet<QName>();

                         }

                         notUnderstoodHeaders.add(qName);

                     } else {

                         // if the binding is not null, see if the binding can understand it

                         if (binding instanceof SOAPBindingImpl && !((SOAPBindingImpl) binding).understandsHeader(qName)) {

                             if (!knownHeaders.contains(qName)) {

                                 //logger.info("Element not understood=" + qName);

                                 if (notUnderstoodHeaders == null) {

                                     notUnderstoodHeaders = new HashSet<QName>();

                                 }

                                 notUnderstoodHeaders.add(qName);

                             }

                         }

                     }

                 }

             }

         }

         return notUnderstoodHeaders;

     }

     private SOAPVersion getEffectiveSOAPVersion(WSBinding binding) {

         SOAPVersion mySOAPVersion = (soapVersion != null) ? soapVersion : binding.getSOAPVersion();

         if (mySOAPVersion == null) {

             mySOAPVersion = SOAPVersion.SOAP_11;

         }

         return mySOAPVersion;

     }

     public void setSoapVersion(SOAPVersion soapVersion) {

        this.soapVersion = soapVersion;

     }

     @Override

     public Iterator<Header> getHeaders() {

         return iterator();

     }

     @Override

     public List<Header> asList() {

         return this;

     }

 }