private void prefetch() {
// reset prefetched element
this.nextElement = null;
while (this.tagEnum.hasNext() && this.nextElement == null) {
ST tag = this.tagEnum.next();
// can tag be used?
if (!tag.hidden()) {
this.nextElement = tag;
}
}
}
protected void add(ST tag) throws SharkKBException {
// only add if not yet in storage
ST st = this.getSemanticTag(tag.getSI());
if (st != null) return; // do nothing
if (tag instanceof InMemoSemanticTag) {
((InMemoSemanticTag) tag).setStorage(this);
}
this.put(tag);
}
protected void removeSemanticTag(ST tag) {
this.tags.remove(tag);
// tag is removed - remove reference in si2tag list
String[] sis = tag.getSI();
if (sis == null | sis.length == 0) {
return;
}
for (int i = 0; i < sis.length; i++) {
this.si2tag.remove(sis[i]);
}
}
protected final void put(ST tag) {
this.tags.add(tag);
// recreate si list - not a very performant implementation have to confess...
// this.initSi();
String[] sis = tag.getSI();
if (sis == null) {
return;
}
for (int i = 0; i < sis.length; i++) {
this.si2tag.put(sis[i], tag);
}
}
ST merge(ST source) throws SharkKBException {
SemanticTag copyTag = null;
if (source == null) {
return null;
}
// try to find tag
copyTag = this.getSemanticTag(source.getSI());
if (copyTag == null) {
if (source instanceof PeerTXSemanticTag) {
copyTag = InMemoSharkKB.createInMemoCopy((PeerTXSemanticTag) source);
} else if (source instanceof PeerSNSemanticTag) {
copyTag = InMemoSharkKB.createInMemoCopy((PeerTXSemanticTag) source);
} else if (source instanceof TimeSemanticTag) {
copyTag = InMemoSharkKB.createInMemoCopy((TimeSemanticTag) source);
} else if (source instanceof SpatialSemanticTag) {
copyTag = InMemoSharkKB.createInMemoCopy((SpatialSemanticTag) source);
} else if (source instanceof TXSemanticTag) {
copyTag = InMemoSharkKB.createInMemoCopy((TXSemanticTag) source);
} else if (source instanceof PeerSemanticTag) {
copyTag = InMemoSharkKB.createInMemoCopy((PeerSemanticTag) source);
} else if (source instanceof SNSemanticTag) {
copyTag = InMemoSharkKB.createInMemoCopy((SNSemanticTag) source);
} else if (source instanceof SemanticTag) {
copyTag = InMemoSharkKB.createInMemoCopy((SemanticTag) source);
}
this.add((ST) copyTag);
} else {
SharkCSAlgebra.merge(copyTag, source);
}
// this.initSi();
return (ST) copyTag;
}