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Rich-text area for JavaFX
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package org.fxmisc.richtext.model;
import java.util.Optional;
/**
* Provides a base for properly implementing the {@link SegmentOps} interface and reduces boilerplate,
* so that a developer only needs to implement methods for real segments, not empty ones. Optionally,
* {@link #joinSeg(Object, Object)} and {@link #joinStyle(Object, Object)} can be overridden as well.
*
* @param the type of segment
* @param the type of style
*/
public abstract class SegmentOpsBase implements SegmentOps {
private final SEG empty;
/**
* Creates a {@link SegmentOpsBase} that returns {@code emptySeg} every time an empty segment should be returned
*/
public SegmentOpsBase(SEG emptySeg) {
this.empty = emptySeg;
}
@Override
public final char charAt(SEG seg, int index) {
return length(seg) == 0 ? '\0' : realCharAt(seg, index);
}
public abstract char realCharAt(SEG seg, int index);
@Override
public final String getText(SEG seg) {
return length(seg) == 0 ? "" : realGetText(seg);
}
public abstract String realGetText(SEG seg);
@Override
public final SEG subSequence(SEG seg, int start, int end) {
if (start < 0) {
throw new IllegalArgumentException("Start cannot be negative. Start=" + start);
}
if (end > length(seg)) {
throw new IllegalArgumentException(
String.format("End cannot be greater than segment's length. End=%s Length=%s", end, length(seg))
);
}
return length(seg) == 0 || start == end
? empty
: realSubSequence(seg, start, end);
}
public abstract SEG realSubSequence(SEG seg, int start, int end);
@Override
public final SEG subSequence(SEG seg, int start) {
return length(seg) == 0 || start == length(seg)
? empty
: realSubSequence(seg, start);
}
public SEG realSubSequence(SEG seg, int start) {
return realSubSequence(seg, start, length(seg));
}
@Override
public final SEG createEmptySeg() {
return empty;
}
@Override
public Optional joinStyle(S currentStyle, S nextStyle) {
return Optional.empty();
}
}