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[core] Add XmlStringBuilder.setAppendApproach()

This commit is contained in:
Florian Schmaus 2023-11-28 10:58:24 +01:00
parent 04dc212db8
commit dac06b04c3
1 changed files with 32 additions and 5 deletions
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37
smack-core/src/main/java/org/jivesoftware/smack/util/XmlStringBuilder.java
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@ -33,8 +33,6 @@ import org.jxmpp.util.XmppDateTime;
public class XmlStringBuilder implements Appendable, CharSequence, Element {
public static final String RIGHT_ANGLE_BRACKET = Character.toString('>');
public static final boolean FLAT_APPEND = false;
private final LazyStringBuilder sb;
private final XmlEnvironment effectiveXmlEnvironment;
@ -595,10 +593,40 @@ public class XmlStringBuilder implements Appendable, CharSequence, Element {
return this;
}
enum AppendApproach {
/**
* Simply add the given CharSequence to this builder.
*/
SINGLE,
/**
* If the given CharSequence is a {@link XmlStringBuilder} or {@link LazyStringBuilder}, then copy the
* references of the lazy strings parts into this builder. This approach flattens the string builders into one,
* yielding a different performance characteristic.
*/
FLAT,
}
private static AppendApproach APPEND_APPROACH = AppendApproach.SINGLE;
/**
* Set the builders approach on how to append new char sequences.
*
* @param appendApproach the append approach.
*/
public static void setAppendMethod(AppendApproach appendApproach) {
Objects.requireNonNull(appendApproach);
APPEND_APPROACH = appendApproach;
}
@Override
public XmlStringBuilder append(CharSequence csq) {
assert csq != null;
if (FLAT_APPEND) {
switch (APPEND_APPROACH) {
case SINGLE:
sb.append(csq);
break;
case FLAT:
if (csq instanceof XmlStringBuilder) {
sb.append(((XmlStringBuilder) csq).sb);
} else if (csq instanceof LazyStringBuilder) {
@ -606,8 +634,7 @@ public class XmlStringBuilder implements Appendable, CharSequence, Element {
} else {
sb.append(csq);
}
} else {
sb.append(csq);
break;
}
return this;
}