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