vcard.java.

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            }
        }
        return buffer;
    }

    /**
     * Save this vCard for the user connected by 'connection'. Connection should be authenticated
     * and not anonymous.<p>
     * <p/>
     * NOTE: the method is asynchronous and does not wait for the returned value.
     */
    public void save(XMPPConnection connection) {
        checkAuthenticated(connection);

        setType(IQ.Type.SET);
        setFrom(connection.getUser());
        connection.sendPacket(this);
    }

    /**
     * Load VCard information for a connected user. Connection should be authenticated
     * and not anonymous.
     */
    public void load(XMPPConnection connection) throws XMPPException {
        checkAuthenticated(connection);

        setFrom(connection.getUser());
        doLoad(connection, connection.getUser());
    }

    /**
     * Load VCard information for a given user. Connection should be authenticated and not anonymous.
     */
    public void load(XMPPConnection connection, String user) throws XMPPException {
        checkAuthenticated(connection);

        setTo(user);
        doLoad(connection, user);
    }

    private void doLoad(XMPPConnection connection, String user) throws XMPPException {
        setType(Type.GET);
        PacketCollector collector = connection.createPacketCollector(
                new PacketIDFilter(getPacketID()));
        connection.sendPacket(this);

        VCard result = null;
        try {
            result = (VCard) collector.nextResult(SmackConfiguration.getPacketReplyTimeout());

            if (result == null) {
                throw new XMPPException(new XMPPError(408, "Timeout getting VCard information"));
            }
            if (result.getError() != null) {
                throw new XMPPException(result.getError());
            }
        }
        catch (ClassCastException e) {
            System.out.println("No VCard for " + user);
        }

        copyFieldsFrom(result);
    }

    public String getChildElementXML() {
        StringBuffer sb = new StringBuffer();
        new VCardWriter(sb).write();
        return sb.toString();
    }

    private void copyFieldsFrom(VCard result) {
        if (result == null) result = new VCard();

        Field[] fields = VCard.class.getDeclaredFields();
        for (int i = 0; i < fields.length; i++) {
            Field field = fields[i];
            if (field.getDeclaringClass() == VCard.class &&
                    !Modifier.isFinal(field.getModifiers())) {
                try {
                    field.setAccessible(true);
                    field.set(this, field.get(result));
                }
                catch (IllegalAccessException e) {
                    throw new RuntimeException("This cannot happen:" + field, e);
                }
            }
        }
    }

    private void checkAuthenticated(XMPPConnection connection) {
        if (connection == null) {
            new IllegalArgumentException("No connection was provided");
        }
        if (!connection.isAuthenticated()) {
            new IllegalArgumentException("Connection is not authenticated");
        }
        if (connection.isAnonymous()) {
            new IllegalArgumentException("Connection cannot be anonymous");
        }
    }

    private boolean hasContent() {
        //noinspection OverlyComplexBooleanExpression
        return hasNameField()
                || hasOrganizationFields()
                || emailHome != null
                || emailWork != null
                || otherSimpleFields.size() > 0
                || homeAddr.size() > 0
                || homePhones.size() > 0
                || workAddr.size() > 0
                || workPhones.size() > 0
                ;
    }

    private boolean hasNameField() {
        return firstName != null || lastName != null || middleName != null;
    }

    private boolean hasOrganizationFields() {
        return organization != null || organizationUnit != null;
    }

    // Used in tests:

    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        final VCard vCard = (VCard) o;

        if (emailHome != null ? !emailHome.equals(vCard.emailHome) : vCard.emailHome != null) {
            return false;
        }
        if (emailWork != null ? !emailWork.equals(vCard.emailWork) : vCard.emailWork != null) {
            return false;
        }
        if (firstName != null ? !firstName.equals(vCard.firstName) : vCard.firstName != null) {
            return false;
        }
        if (!homeAddr.equals(vCard.homeAddr)) {
            return false;
        }
        if (!homePhones.equals(vCard.homePhones)) {
            return false;
        }
        if (lastName != null ? !lastName.equals(vCard.lastName) : vCard.lastName != null) {
            return false;
        }
        if (middleName != null ? !middleName.equals(vCard.middleName) : vCard.middleName != null) {
            return false;
        }
        if (organization != null ?
                !organization.equals(vCard.organization) : vCard.organization != null) {
            return false;
        }
        if (organizationUnit != null ?
                !organizationUnit.equals(vCard.organizationUnit) : vCard.organizationUnit != null) {
            return false;
        }
        if (!otherSimpleFields.equals(vCard.otherSimpleFields)) {
            return false;
        }
        if (!workAddr.equals(vCard.workAddr)) {
            return false;
        }
        if (!workPhones.equals(vCard.workPhones)) {
            return false;
        }

        return true;
    }

    public int hashCode() {
        int result;
        result = homePhones.hashCode();
        result = 29 * result + workPhones.hashCode();
        result = 29 * result + homeAddr.hashCode();
        result = 29 * result + workAddr.hashCode();
        result = 29 * result + (firstName != null ? firstName.hashCode() : 0);
        result = 29 * result + (lastName != null ? lastName.hashCode() : 0);
        result = 29 * result + (middleName != null ? middleName.hashCode() : 0);
        result = 29 * result + (emailHome != null ? emailHome.hashCode() : 0);
        result = 29 * result + (emailWork != null ? emailWork.hashCode() : 0);
        result = 29 * result + (organization != null ? organization.hashCode() : 0);
        result = 29 * result + (organizationUnit != null ? organizationUnit.hashCode() : 0);
        result = 29 * result + otherSimpleFields.hashCode();
        return result;
    }

    public String toString() {
        return getChildElementXML();
    }

    //==============================================================

    private class VCardWriter {

        private final StringBuffer sb;

        VCardWriter(StringBuffer sb) {
            this.sb = sb;
        }

        public void write() {
            appendTag("vCard", "xmlns", "vcard-temp", hasContent(), new ContentBuilder() {
                public void addTagContent() {
                    buildActualContent();
                }
            });
        }

        private void buildActualContent() {
            if (hasNameField()) {
                appendFN();
                appendN();
            }

            appendOrganization();
            appendGenericFields();

            appendEmail(emailWork, "WORK");
            appendEmail(emailHome, "HOME");

            appendPhones(workPhones, "WORK");
            appendPhones(homePhones, "HOME");

            appendAddress(workAddr, "WORK");
            appendAddress(homeAddr, "HOME");
        }

        private void appendEmail(final String email, final String type) {
            if (email != null) {
                appendTag("EMAIL", true, new ContentBuilder() {
                    public void addTagContent() {
                        appendEmptyTag(type);
                        appendEmptyTag("INTERNET");
                        appendEmptyTag("PREF");
                        appendTag("USERID", email);
                    }
                });
            }
        }

        private void appendPhones(Map phones, final String code) {
            Iterator it = phones.entrySet().iterator();
            while (it.hasNext()) {
                final Map.Entry entry = (Map.Entry) it.next();
                appendTag("TEL", true, new ContentBuilder() {
                    public void addTagContent() {
                        appendEmptyTag(entry.getKey());
                        appendEmptyTag(code);
                        appendTag("NUMBER", (String) entry.getValue());
                    }
                });
            }
        }

        private void appendAddress(final Map addr, final String code) {
            if (addr.size() > 0) {
                appendTag("ADR", true, new ContentBuilder() {
                    public void addTagContent() {
                        appendEmptyTag(code);

                        Iterator it = addr.entrySet().iterator();
                        while (it.hasNext()) {
                            final Map.Entry entry = (Map.Entry) it.next();
                            appendTag((String) entry.getKey(), (String) entry.getValue());
                        }
                    }
                });
            }
        }

        private void appendEmptyTag(Object tag) {
            sb.append('<').append(tag).append("/>");
        }

        private void appendGenericFields() {
            Iterator it = otherSimpleFields.entrySet().iterator();
            while (it.hasNext()) {
                Map.Entry entry = (Map.Entry) it.next();
                appendTag(entry.getKey().toString(), (String) entry.getValue());
            }
        }

        private void appendOrganization() {
            if (hasOrganizationFields()) {
                appendTag("ORG", true, new ContentBuilder() {
                    public void addTagContent() {
                        appendTag("ORGNAME", organization);
                        appendTag("ORGUNIT", organizationUnit);
                    }
                });
            }
        }

        private void appendField(String tag) {
            String value = (String) otherSimpleFields.get(tag);
            appendTag(tag, value);
        }

        private void appendFN() {
            final ContentBuilder contentBuilder = new ContentBuilder() {
                public void addTagContent() {
                    if (firstName != null) {
                        sb.append(firstName + ' ');
                    }
                    if (middleName != null) {
                        sb.append(middleName + ' ');
                    }
                    if (lastName != null) {
                        sb.append(lastName);
                    }
                }
            };
            appendTag("FN", true, contentBuilder);
        }

        private void appendN() {
            appendTag("N", true, new ContentBuilder() {
                public void addTagContent() {
                    appendTag("FAMILY", lastName);
                    appendTag("GIVEN", firstName);
                    appendTag("MIDDLE", middleName);
                }
            });
        }

        private void appendTag(String tag, String attr, String attrValue, boolean hasContent,
                ContentBuilder builder) {
            sb.append('<').append(tag);
            if (attr != null) {
                sb.append(' ').append(attr).append('=').append('\'').append(attrValue).append('\'');
            }

            if (hasContent) {
                sb.append('>');
                builder.addTagContent();
                sb.append("</").append(tag).append(">\n");
            }
            else {
                sb.append("/>\n");
            }
        }

        private void appendTag(String tag, boolean hasContent, ContentBuilder builder) {
            appendTag(tag, null, null, hasContent, builder);
        }

        private void appendTag(String tag, final String tagText) {
            if (tagText == null) return;
            final ContentBuilder contentBuilder = new ContentBuilder() {
                public void addTagContent() {
                    sb.append(tagText.trim());
                }
            };
            appendTag(tag, true, contentBuilder);
        }

    }

    //==============================================================

    private interface ContentBuilder {

        void addTagContent();
    }

    //==============================================================
}