/**
* Creates an excerpt for the given <code>hit</code>.
*
* @param hit the current hit.
* @param excerptPropNames the names of the properties to use for the excerpt.
* @param maxLength the maximum length of the excerpt.
* @return the excerpt.
* @throws RepositoryException if an error occurs while reading from the repository.
*/
public static Excerpt create(final HitImpl hit, final Set excerptPropNames, final int maxLength)
throws RepositoryException {
Node node = hit.getResource().adaptTo(Node.class);
if (node == null) {
// use repository built in mechanism
return new Excerpt(hit.getExcerpts().get("."));
}
Node content =
node.hasNode(JcrConstants.JCR_CONTENT) ? node.getNode(JcrConstants.JCR_CONTENT) : node;
if (content.isNodeType(JcrConstants.NT_RESOURCE)) {
// use repository built in mechanism
return new Excerpt(hit.getExcerpts().get("."));
}
final List<Excerpt> excerpt = new ArrayList<Excerpt>();
final int prefixLength = node.getPath().length() + 1;
// build excerpt built on a given set of property names
try {
content.accept(
new TraversingItemVisitor.Default(true) {
protected void entering(Property property, int level) throws RepositoryException {
if (!excerptPropNames.contains(property.getName())) {
// ignore
return;
}
String relPath = property.getPath().substring(prefixLength);
Excerpt e = createExcerpt(property, relPath, hit.getRow(), maxLength);
if (e == null) {
return;
}
if (e.hasHighlights) {
excerpt.clear();
excerpt.add(e);
throw new RepositoryException();
} else if (excerpt.size() == 0) {
excerpt.add(e);
}
}
});
} catch (RepositoryException e) {
if (excerpt.size() == 0) {
throw e;
}
// otherwise the exception was thrown to
// terminate the traversal
}
if (excerpt.size() == 0) {
// no suitable excerpt found
return new Excerpt("");
} else {
return excerpt.get(0);
}
}
