policy/src/main/java/org/apache/wss4j/policy/model/NSStack.java [98:242]:
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    private void clearFrame() {
        while (stack[top] != null) {
            top--;
        }
    }

    /**
     * Reset the embedded iterator in this class to the top of the current
     * (i.e., last) frame.  Note that this is not threadsafe, nor does it
     * provide multiple iterators, so don't use this recursively.  Nor
     * should you modify the stack while iterating over it.
     */
    public Mapping topOfFrame() {
        iterator = top;
        while (stack[iterator] != null) {
            iterator--;
        }
        iterator++;
        return next();
    }

    /**
     * Return the next namespace mapping in the top frame.
     */
    public Mapping next() {
        if (iterator > top) {
            return null;
        } else {
            return stack[iterator++];
        }
    }

    /**
     * Add a mapping for a namespaceURI to the specified prefix to the top
     * frame in the stack.  If the prefix is already mapped in that frame,
     * remap it to the (possibly different) namespaceURI.
     */
    public void add(String namespaceURI, String prefix) {
        int idx = top;
        try {
            // Replace duplicate prefixes (last wins - this could also fault)
            for (int cursor = top; stack[cursor] != null; cursor--) {
                if (stack[cursor].getPrefix().equals(prefix)) {
                    stack[cursor].setNamespaceURI(namespaceURI);
                    idx = cursor;
                    return;
                }
            }
            push();
            stack[top] = new Mapping(namespaceURI, prefix);
            idx = top;
        } finally {
            // If this is the default namespace, note the new in-scope
            // default is here.
            if (prefix.length() == 0) {
                currentDefaultNS = idx;
            }
        }
    }

    /**
     * Return an active prefix for the given namespaceURI.  NOTE : This
     * may return null even if the namespaceURI was actually mapped further
     * up the stack IF the prefix which was used has been repeated further
     * down the stack.  I.e.:
     * <p/>
     * <pre:outer xmlns:pre="namespace">
     * <pre:inner xmlns:pre="otherNamespace">
     * *here's where we're looking*
     * </pre:inner>
     * </pre:outer>
     * <p/>
     * If we look for a prefix for "namespace" at the indicated spot, we won't
     * find one because "pre" is actually mapped to "otherNamespace"
     */
    public String getPrefix(String namespaceURI, boolean noDefault) {
        if (namespaceURI == null || namespaceURI.isEmpty()) {
            return null;
        }
        int hash = namespaceURI.hashCode();

        // If defaults are OK, and the given NS is the current default,
        // return "" as the prefix to favor defaults where possible.
        if (!noDefault && currentDefaultNS > 0 && stack[currentDefaultNS] != null
            && namespaceURI.equals(stack[currentDefaultNS].getNamespaceURI())) {
            return "";
        }
        for (int cursor = top; cursor > 0; cursor--) {
            Mapping map = stack[cursor];
            if (map == null) {
                continue;
            }
            if (map.getNamespaceHash() == hash && map.getNamespaceURI().equals(namespaceURI)) {
                String possiblePrefix = map.getPrefix();
                if (noDefault && possiblePrefix.length() == 0) {
                    continue;
                }

                // now make sure that this is the first occurance of this
                // particular prefix
                int ppHash = possiblePrefix.hashCode();
                for (int cursor2 = top; true; cursor2--) {
                    if (cursor2 == cursor) {
                        return possiblePrefix;
                    }
                    map = stack[cursor2];
                    if (map == null) {
                        continue;
                    }
                    if (ppHash == map.getPrefixHash() && possiblePrefix.equals(map.getPrefix())) {
                        break;
                    }
                }
            }
        }
        return null;
    }

    /**
     * Return an active prefix for the given namespaceURI, including
     * the default prefix ("").
     */
    public String getPrefix(String namespaceURI) {
        return getPrefix(namespaceURI, false);
    }

    /**
     * Given a prefix, return the associated namespace (if any).
     */
    public String getNamespaceURI(String prefix) {
        String pfix = prefix;
        if (pfix == null) {
            pfix = "";
        }
        int hash = pfix.hashCode();
        for (int cursor = top; cursor > 0; cursor--) {
            Mapping map = stack[cursor];
            if (map == null) {
                continue;
            }
            if (map.getPrefixHash() == hash && map.getPrefix().equals(pfix)) {
                return map.getNamespaceURI();
            }
        }
        return null;
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ws-security-common/src/main/java/org/apache/wss4j/common/util/NSStack.java [108:252]:
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    private void clearFrame() {
        while (stack[top] != null) {
            top--;
        }
    }

    /**
     * Reset the embedded iterator in this class to the top of the current
     * (i.e., last) frame.  Note that this is not threadsafe, nor does it
     * provide multiple iterators, so don't use this recursively.  Nor
     * should you modify the stack while iterating over it.
     */
    public Mapping topOfFrame() {
        iterator = top;
        while (stack[iterator] != null) {
            iterator--;
        }
        iterator++;
        return next();
    }

    /**
     * Return the next namespace mapping in the top frame.
     */
    public Mapping next() {
        if (iterator > top) {
            return null;
        } else {
            return stack[iterator++];
        }
    }

    /**
     * Add a mapping for a namespaceURI to the specified prefix to the top
     * frame in the stack.  If the prefix is already mapped in that frame,
     * remap it to the (possibly different) namespaceURI.
     */
    public void add(String namespaceURI, String prefix) {
        int idx = top;
        try {
            // Replace duplicate prefixes (last wins - this could also fault)
            for (int cursor = top; stack[cursor] != null; cursor--) {
                if (stack[cursor].getPrefix().equals(prefix)) {
                    stack[cursor].setNamespaceURI(namespaceURI);
                    idx = cursor;
                    return;
                }
            }
            push();
            stack[top] = new Mapping(namespaceURI, prefix);
            idx = top;
        } finally {
            // If this is the default namespace, note the new in-scope
            // default is here.
            if (prefix.length() == 0) {
                currentDefaultNS = idx;
            }
        }
    }

    /**
     * Return an active prefix for the given namespaceURI.  NOTE : This
     * may return null even if the namespaceURI was actually mapped further
     * up the stack IF the prefix which was used has been repeated further
     * down the stack.  I.e.:
     * <p/>
     * <pre:outer xmlns:pre="namespace">
     * <pre:inner xmlns:pre="otherNamespace">
     * *here's where we're looking*
     * </pre:inner>
     * </pre:outer>
     * <p/>
     * If we look for a prefix for "namespace" at the indicated spot, we won't
     * find one because "pre" is actually mapped to "otherNamespace"
     */
    public String getPrefix(String namespaceURI, boolean noDefault) {
        if (namespaceURI == null || namespaceURI.isEmpty()) {
            return null;
        }
        int hash = namespaceURI.hashCode();

        // If defaults are OK, and the given NS is the current default,
        // return "" as the prefix to favor defaults where possible.
        if (!noDefault && currentDefaultNS > 0 && stack[currentDefaultNS] != null
            && namespaceURI.equals(stack[currentDefaultNS].getNamespaceURI())) {
            return "";
        }
        for (int cursor = top; cursor > 0; cursor--) {
            Mapping map = stack[cursor];
            if (map == null) {
                continue;
            }
            if (map.getNamespaceHash() == hash && map.getNamespaceURI().equals(namespaceURI)) {
                String possiblePrefix = map.getPrefix();
                if (noDefault && possiblePrefix.length() == 0) {
                    continue;
                }

                // now make sure that this is the first occurance of this
                // particular prefix
                int ppHash = possiblePrefix.hashCode();
                for (int cursor2 = top; true; cursor2--) {
                    if (cursor2 == cursor) {
                        return possiblePrefix;
                    }
                    map = stack[cursor2];
                    if (map == null) {
                        continue;
                    }
                    if (ppHash == map.getPrefixHash() && possiblePrefix.equals(map.getPrefix())) {
                        break;
                    }
                }
            }
        }
        return null;
    }

    /**
     * Return an active prefix for the given namespaceURI, including
     * the default prefix ("").
     */
    public String getPrefix(String namespaceURI) {
        return getPrefix(namespaceURI, false);
    }

    /**
     * Given a prefix, return the associated namespace (if any).
     */
    public String getNamespaceURI(String prefix) {
        String pfix = prefix;
        if (pfix == null) {
            pfix = "";
        }
        int hash = pfix.hashCode();
        for (int cursor = top; cursor > 0; cursor--) {
            Mapping map = stack[cursor];
            if (map == null) {
                continue;
            }
            if (map.getPrefixHash() == hash && map.getPrefix().equals(pfix)) {
                return map.getNamespaceURI();
            }
        }
        return null;
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