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Code Issues Releases Wiki Activity

Rework XML Element hierarchy and XmlStringBuilder

Browse source 
- Reduce the amount of types that are subtypes of NamedElement. See
javadoc of NamedElement for rationale.
- Work more with XmlEnvironment in XmlStringBuilder.
- Some minor changes to XmlStringBuilder API.
This commit is contained in:
Florian Schmaus 2019-09-07 18:17:08 +02:00
parent e9bcdf3e6d
commit 65576cf3c2
74 changed files with 653 additions and 523 deletions
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4
smack-core/src/main/java/org/jivesoftware/smack/packet/AbstractError.java
View file

@ -114,9 +114,7 @@ public class AbstractError {
xml.escape(text);
xml.closeElement("text");
}
for (ExtensionElement packetExtension : extensions) {
xml.append(packetExtension.toXML());
}
xml.append(extensions);
}
public abstract static class Builder<B extends Builder<B>> {

18
smack-core/src/main/java/org/jivesoftware/smack/packet/AbstractTextElement.java
View file

@ -1,6 +1,6 @@
/**
*
* Copyright © 2017 Florian Schmaus
* Copyright © 2017-2019 Florian Schmaus
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
@ -38,8 +38,7 @@ public abstract class AbstractTextElement implements ExtensionElement {
@Override
public XmlStringBuilder toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
XmlStringBuilder xml = new XmlStringBuilder(this);
xml.optXmlLangAttribute(lang);
XmlStringBuilder xml = new XmlStringBuilder(this, enclosingNamespace);
xml.rightAngleBracket();
xml.escape(text);
xml.closeElement(this);
@ -50,6 +49,19 @@ public abstract class AbstractTextElement implements ExtensionElement {
return text;
}
@Override
public final String getLanguage() {
return lang;
}
/**
* Deprecated.
*
* @return deprecated
* @deprecated use {@link #getLanguage()} instead.
*/
@Deprecated
// TODO: Remove in Smack 4.5.
public final String getLang() {
return lang;
}

9
smack-core/src/main/java/org/jivesoftware/smack/packet/FullyQualifiedElement.java
View file

@ -32,4 +32,13 @@ public interface FullyQualifiedElement extends NamedElement {
String localPart = getElementName();
return new QName(namespaceURI, localPart);
}
/**
* Returns the xml:lang of this XML element, or null if one has not been set.
*
* @return the xml:lang of this XML element, or null.
*/
default String getLanguage() {
return null;
}
}

74
smack-core/src/main/java/org/jivesoftware/smack/packet/IQ.java
View file

@ -136,6 +136,11 @@ public abstract class IQ extends Stanza {
return childElementNamespace;
}
@Override
public final String getElementName() {
return IQ_ELEMENT;
}
@Override
public final String toString() {
StringBuilder sb = new StringBuilder();
@ -150,9 +155,8 @@ public abstract class IQ extends Stanza {
@Override
public final XmlStringBuilder toXML(XmlEnvironment enclosingXmlEnvironment) {
XmlStringBuilder buf = new XmlStringBuilder(enclosingXmlEnvironment);
buf.halfOpenElement(IQ_ELEMENT);
addCommonAttributes(buf, enclosingXmlEnvironment);
XmlStringBuilder buf = new XmlStringBuilder(this, enclosingXmlEnvironment);
addCommonAttributes(buf);
if (type == null) {
buf.attribute("type", "get");
}
@ -160,7 +164,7 @@ public abstract class IQ extends Stanza {
buf.attribute("type", type.toString());
}
buf.rightAngleBracket();
buf.append(getChildElementXML(enclosingXmlEnvironment));
appendInnerXml(buf);
buf.closeElement(IQ_ELEMENT);
return buf;
}
@ -171,44 +175,52 @@ public abstract class IQ extends Stanza {
*
* @return the child element section of the IQ XML.
*/
// TODO: This method should not be part of the public API as it is mostly used for testing purposes, with the one
// exception of AdHocCommand.getRaw().
public final XmlStringBuilder getChildElementXML() {
return getChildElementXML(null);
XmlStringBuilder xml = new XmlStringBuilder();
appendInnerXml(xml);
return xml;
}
/**
* Returns the sub-element XML section of the IQ packet, or the empty String if there
* isn't one.
* Append the sub-element XML section of the IQ stanza.
*
* @param enclosingXmlEnvironment the enclosing XML namespace.
* @return the child element section of the IQ XML.
* @since 4.3.0
* @param xml the XmlStringBuilder to append to.
*/
public final XmlStringBuilder getChildElementXML(XmlEnvironment enclosingXmlEnvironment) {
XmlStringBuilder xml = new XmlStringBuilder();
private void appendInnerXml(XmlStringBuilder xml) {
if (type == Type.error) {
// Add the error sub-packet, if there is one.
appendErrorIfExists(xml, enclosingXmlEnvironment);
appendErrorIfExists(xml);
return;
}
if (childElementName == null) {
return;
}
else if (childElementName != null) {
// Add the query section if there is one.
IQChildElementXmlStringBuilder iqChildElement = getIQChildElementBuilder(new IQChildElementXmlStringBuilder(this));
if (iqChildElement != null) {
xml.append(iqChildElement);
List<ExtensionElement> extensionsXml = getExtensions();
if (iqChildElement.isEmptyElement) {
if (extensionsXml.isEmpty()) {
xml.closeEmptyElement();
return xml;
} else {
xml.rightAngleBracket();
}
}
xml.append(extensionsXml);
xml.closeElement(iqChildElement.element);
}
// Add the query section if there is one.
IQChildElementXmlStringBuilder iqChildElement = getIQChildElementBuilder(
new IQChildElementXmlStringBuilder(this));
// TOOD: Document the cases where iqChildElement is null but childElementName not. And if there are none, change
// the logic.
if (iqChildElement == null) {
return;
}
return xml;
xml.append(iqChildElement);
List<ExtensionElement> extensionsXml = getExtensions();
if (iqChildElement.isEmptyElement) {
if (extensionsXml.isEmpty()) {
xml.closeEmptyElement();
return;
}
xml.rightAngleBracket();
}
xml.append(extensionsXml);
xml.closeElement(iqChildElement.element);
}
/**

35
smack-core/src/main/java/org/jivesoftware/smack/packet/Message.java
View file

@ -467,6 +467,11 @@ public final class Message extends Stanza implements TypedCloneable<Message> {
return language;
}
@Override
public String getElementName() {
return ELEMENT;
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder();
@ -481,9 +486,8 @@ public final class Message extends Stanza implements TypedCloneable<Message> {
@Override
public XmlStringBuilder toXML(XmlEnvironment enclosingXmlEnvironment) {
XmlStringBuilder buf = new XmlStringBuilder(enclosingXmlEnvironment);
buf.halfOpenElement(ELEMENT);
enclosingXmlEnvironment = addCommonAttributes(buf, enclosingXmlEnvironment);
XmlStringBuilder buf = new XmlStringBuilder(this, enclosingXmlEnvironment);
addCommonAttributes(buf);
buf.optAttribute("type", type);
buf.rightAngleBracket();
@ -497,16 +501,16 @@ public final class Message extends Stanza implements TypedCloneable<Message> {
// Skip the default language
if (subject.equals(defaultSubject))
continue;
buf.append(subject.toXML());
buf.append(subject);
}
buf.optElement("thread", thread);
// Append the error subpacket if the message type is an error.
if (type == Type.error) {
appendErrorIfExists(buf, enclosingXmlEnvironment);
appendErrorIfExists(buf);
}
// Add extension elements, if any are defined.
buf.append(getExtensions(), enclosingXmlEnvironment);
buf.append(getExtensions());
buf.closeElement(ELEMENT);
return buf;
@ -544,11 +548,7 @@ public final class Message extends Stanza implements TypedCloneable<Message> {
this.subject = subject;
}
/**
* Returns the language of this message subject.
*
* @return the language of this message subject.
*/
@Override
public String getLanguage() {
return language;
}
@ -592,8 +592,8 @@ public final class Message extends Stanza implements TypedCloneable<Message> {
@Override
public XmlStringBuilder toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
XmlStringBuilder xml = new XmlStringBuilder();
xml.halfOpenElement(getElementName()).optXmlLangAttribute(getLanguage()).rightAngleBracket();
XmlStringBuilder xml = new XmlStringBuilder(this, enclosingNamespace);
xml.rightAngleBracket();
xml.escape(subject);
xml.closeElement(getElementName());
return xml;
@ -642,12 +642,7 @@ public final class Message extends Stanza implements TypedCloneable<Message> {
this.namespace = Objects.requireNonNull(namespace);
}
/**
* Returns the language of this message body or {@code null} if the body extension element does not explicitly
* set a language, but instead inherits it from the outer element (usually a {@link Message} stanza).
*
* @return the language of this message body or {@code null}.
*/
@Override
public String getLanguage() {
return language;
}
@ -692,7 +687,7 @@ public final class Message extends Stanza implements TypedCloneable<Message> {
@Override
public XmlStringBuilder toXML(XmlEnvironment enclosingXmlEnvironment) {
XmlStringBuilder xml = new XmlStringBuilder(this, enclosingXmlEnvironment);
xml.optXmlLangAttribute(getLanguage()).rightAngleBracket();
xml.rightAngleBracket();
xml.escape(message);
xml.closeElement(getElementName());
return xml;

11
smack-core/src/main/java/org/jivesoftware/smack/packet/NamedElement.java
View file

@ -1,6 +1,6 @@
/**
*
* Copyright © 2014 Florian Schmaus
* Copyright © 2014-2019 Florian Schmaus
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
@ -18,8 +18,13 @@
package org.jivesoftware.smack.packet;
/**
* Interface to represent a XML element. This is similar to {@link ExtensionElement}, but does not
* carry a namespace and is usually included as child element of an stanza extension.
* Interface to represent a XML element. This is similar to {@link ExtensionElement}, but does not carry a single
* namespace, but instead is used with multiple namespaces. Examples for this include MUC's &lt;destroy/&gt; element.
* <p>
* Please note that usage of this interface is <b>discouraged</b>. The reason is that every XML element is fully
* qualified, i.e., it is qualified by a namespace. The namespace may not be explicitly given, but instead, is inherited
* from an outer element. Use {@link FullyQualifiedElement} instead when possible.
* </p>
*/
public interface NamedElement extends Element {

4
smack-core/src/main/java/org/jivesoftware/smack/packet/Nonza.java
View file

@ -1,6 +1,6 @@
/**
*
* Copyright © 2014-2015 Florian Schmaus
* Copyright © 2014-2019 Florian Schmaus
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
@ -30,6 +30,6 @@ package org.jivesoftware.smack.packet;
* @author Florian Schmaus
* @see <a href="http://xmpp.org/extensions/xep-0360.html">XEP-0360: Nonzas (are not Stanzas)</a>
*/
public interface Nonza extends TopLevelStreamElement, FullyQualifiedElement {
public interface Nonza extends TopLevelStreamElement {
}

6
smack-core/src/main/java/org/jivesoftware/smack/packet/Packet.java
View file

@ -113,11 +113,7 @@ public interface Packet extends TopLevelStreamElement {
*/
void setError(StanzaError error);
/**
* Returns the xml:lang of this Stanza, or null if one has not been set.
*
* @return the xml:lang of this Stanza, or null.
*/
@Override
String getLanguage();
/**

14
smack-core/src/main/java/org/jivesoftware/smack/packet/Presence.java
View file

@ -256,6 +256,11 @@ public final class Presence extends Stanza implements TypedCloneable<Presence> {
this.mode = mode;
}
@Override
public String getElementName() {
return ELEMENT;
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder();
@ -277,9 +282,8 @@ public final class Presence extends Stanza implements TypedCloneable<Presence> {
@Override
public XmlStringBuilder toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
XmlStringBuilder buf = new XmlStringBuilder(enclosingNamespace);
buf.halfOpenElement(ELEMENT);
addCommonAttributes(buf, enclosingNamespace);
XmlStringBuilder buf = new XmlStringBuilder(this, enclosingNamespace);
addCommonAttributes(buf);
if (type != Type.available) {
buf.attribute("type", type);
}
@ -291,10 +295,10 @@ public final class Presence extends Stanza implements TypedCloneable<Presence> {
buf.element("show", mode);
}
buf.append(getExtensions(), enclosingNamespace);
buf.append(getExtensions());
// Add the error sub-packet, if there is one.
appendErrorIfExists(buf, enclosingNamespace);
appendErrorIfExists(buf);
buf.closeElement(ELEMENT);

43
smack-core/src/main/java/org/jivesoftware/smack/packet/Stanza.java
View file

@ -59,6 +59,10 @@ public abstract class Stanza implements TopLevelStreamElement {
private final MultiMap<QName, ExtensionElement> extensionElements = new MultiMap<>();
// Assume that all stanzas Smack handles are in the client namespace, since Smack is an XMPP client library. We can
// change this behavior later if it is required.
private final String namespace = StreamOpen.CLIENT_NAMESPACE;
private String id = null;
private Jid to;
private Jid from;
@ -283,11 +287,7 @@ public abstract class Stanza implements TopLevelStreamElement {
error = xmppErrorBuilder.build();
}
/**
* Returns the xml:lang of this Stanza, or null if one has not been set.
*
* @return the xml:lang of this Stanza, or null.
*/
@Override
public String getLanguage() {
return language;
}
@ -491,6 +491,11 @@ public abstract class Stanza implements TopLevelStreamElement {
@Override
public abstract String toString();
@Override
public final String getNamespace() {
return namespace;
}
/**
* Returns the default language used for all messages containing localized content.
*
@ -501,33 +506,14 @@ public abstract class Stanza implements TopLevelStreamElement {
}
/**
* Add to, from, id and 'xml:lang' attributes
* Add to, from, and id attributes.
*
* @param xml the {@link XmlStringBuilder}.
* @param enclosingXmlEnvironment the enclosing XML namespace.
* @return the XML environment for this stanza.
*/
protected XmlEnvironment addCommonAttributes(XmlStringBuilder xml, XmlEnvironment enclosingXmlEnvironment) {
String language = getLanguage();
String namespace = StreamOpen.CLIENT_NAMESPACE;
if (enclosingXmlEnvironment != null) {
String effectiveEnclosingNamespace = enclosingXmlEnvironment.getEffectiveNamespaceOrUse(namespace);
switch (effectiveEnclosingNamespace) {
case StreamOpen.CLIENT_NAMESPACE:
case StreamOpen.SERVER_NAMESPACE:
break;
default:
namespace = effectiveEnclosingNamespace;
}
}
xml.xmlnsAttribute(namespace);
protected final void addCommonAttributes(XmlStringBuilder xml) {
xml.optAttribute("to", getTo());
xml.optAttribute("from", getFrom());
xml.optAttribute("id", getStanzaId());
xml.xmllangAttribute(language);
return new XmlEnvironment(namespace, language);
}
protected void logCommonAttributes(StringBuilder sb) {
@ -546,12 +532,11 @@ public abstract class Stanza implements TopLevelStreamElement {
* Append an XMPPError is this stanza has one set.
*
* @param xml the XmlStringBuilder to append the error to.
* @param enclosingXmlEnvironment the enclosing XML environment.
*/
protected void appendErrorIfExists(XmlStringBuilder xml, XmlEnvironment enclosingXmlEnvironment) {
protected void appendErrorIfExists(XmlStringBuilder xml) {
StanzaError error = getError();
if (error != null) {
xml.append(error.toXML(enclosingXmlEnvironment));
xml.append(error);
}
}
}

4
smack-core/src/main/java/org/jivesoftware/smack/packet/TopLevelStreamElement.java
View file

@ -1,6 +1,6 @@
/**
*
* Copyright © 2014-2018 Florian Schmaus
* Copyright © 2014-2019 Florian Schmaus
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
@ -20,6 +20,6 @@ package org.jivesoftware.smack.packet;
* A XMPP top level stream element. This is either a stanza ({@link Stanza}) or
* just a plain stream element ({@link Nonza}).
*/
public interface TopLevelStreamElement extends Element {
public interface TopLevelStreamElement extends FullyQualifiedElement {
}

23
smack-core/src/main/java/org/jivesoftware/smack/packet/XmlEnvironment.java
View file

@ -106,6 +106,29 @@ public class XmlEnvironment {
return effectiveLanguage;
}
public boolean effectiveLanguageEquals(String language) {
String effectiveLanguage = getEffectiveLanguage();
if (effectiveLanguage == null) {
return false;
}
return effectiveLanguage.equals(language);
}
private transient String toStringCache;
@Override
public String toString() {
if (toStringCache == null) {
StringBuilder sb = new StringBuilder();
sb.append(XmlEnvironment.class.getSimpleName()).append(' ');
sb.append("xmlns=").append(getEffectiveNamespace()).append(' ');
sb.append("xmllang=").append(getEffectiveLanguage()).append(' ');
toStringCache = sb.toString();
}
return toStringCache;
}
public static XmlEnvironment from(XmlPullParser parser) {
return from(parser, null);
}

49
smack-core/src/main/java/org/jivesoftware/smack/util/XmlStringBuilder.java
View file

@ -38,17 +38,12 @@ public class XmlStringBuilder implements Appendable, CharSequence, Element {
private final XmlEnvironment effectiveXmlEnvironment;
public XmlStringBuilder() {
this((XmlEnvironment) null);
}
public XmlStringBuilder(XmlEnvironment effectiveXmlEnvironment) {
sb = new LazyStringBuilder();
this.effectiveXmlEnvironment = effectiveXmlEnvironment;
effectiveXmlEnvironment = null;
}
public XmlStringBuilder(ExtensionElement pe) {
this();
prelude(pe);
this(pe, null);
}
public XmlStringBuilder(NamedElement e) {
@ -59,12 +54,24 @@ public class XmlStringBuilder implements Appendable, CharSequence, Element {
public XmlStringBuilder(FullyQualifiedElement element, XmlEnvironment enclosingXmlEnvironment) {
sb = new LazyStringBuilder();
halfOpenElement(element);
if (enclosingXmlEnvironment != null
&& !enclosingXmlEnvironment.effectiveNamespaceEquals(element.getNamespace())) {
xmlnsAttribute(element.getNamespace());
String xmlNs = element.getNamespace();
String xmlLang = element.getLanguage();
if (enclosingXmlEnvironment == null) {
xmlnsAttribute(xmlNs);
xmllangAttribute(xmlLang);
} else {
if (!enclosingXmlEnvironment.effectiveNamespaceEquals(xmlNs)) {
xmlnsAttribute(xmlNs);
}
if (!enclosingXmlEnvironment.effectiveLanguageEquals(xmlLang)) {
xmllangAttribute(xmlLang);
}
}
effectiveXmlEnvironment = XmlEnvironment.builder()
.withNamespace(element.getNamespace())
.withNamespace(xmlNs)
.withLanguage(xmlLang)
.withNext(enclosingXmlEnvironment)
.build();
}
@ -124,6 +131,15 @@ public class XmlStringBuilder implements Appendable, CharSequence, Element {
return this;
}
/**
* Deprecated.
*
* @param element deprecated.
* @return deprecated.
* @deprecated use {@link #append(Element)} instead.
*/
@Deprecated
// TODO: Remove in Smack 4.5.
public XmlStringBuilder element(Element element) {
assert element != null;
return append(element.toXML());
@ -161,7 +177,7 @@ public class XmlStringBuilder implements Appendable, CharSequence, Element {
public XmlStringBuilder optElement(Element element) {
if (element != null) {
append(element.toXML());
append(element);
}
return this;
}
@ -435,6 +451,7 @@ public class XmlStringBuilder implements Appendable, CharSequence, Element {
}
public XmlStringBuilder xmllangAttribute(String value) {
// TODO: This should probably be attribute(), not optAttribute().
optAttribute("xml:lang", value);
return this;
}
@ -499,13 +516,13 @@ public class XmlStringBuilder implements Appendable, CharSequence, Element {
return this;
}
public XmlStringBuilder append(Collection<? extends Element> elements) {
return append(elements, effectiveXmlEnvironment);
public XmlStringBuilder append(Element element) {
return append(element.toXML(effectiveXmlEnvironment));
}
public XmlStringBuilder append(Collection<? extends Element> elements, XmlEnvironment enclosingXmlEnvironment) {
public XmlStringBuilder append(Collection<? extends Element> elements) {
for (Element element : elements) {
append(element.toXML(enclosingXmlEnvironment));
append(element);
}
return this;
}

5
smack-core/src/test/java/org/jivesoftware/smack/StanzaCollectorTest.java
View file

@ -188,5 +188,10 @@ public class StanzaCollectorTest {
public String toString() {
return toXML().toString();
}
@Override
public String getElementName() {
return "packetId";
}
}
}

4
smack-core/src/test/java/org/jivesoftware/smack/util/PacketParserUtilsTest.java
View file

@ -738,10 +738,6 @@ public class PacketParserUtilsTest {
.a("type", "chat")
.a("xml:lang", "en")
.e("body")
// TODO: Remove the following xml:lang once Smack's serialization toXml() API is aware of a potential
// scoping xml:lang value. The out message stanza already declares an xml:lang with the exact same
// value, hence this statement is redundant.
.a("xml:lang", "en")
.t("This is a test of the emergency broadcast system, 1.")
.up()
.e("body")