~slub.team/goobi-indexserver/3.x

* Takes optional multivalued, comma separated param string as: size[<traversal size>],highlight[<int>],maxFrags[<int>],mergeContiguous[<boolean>],fields[name1;name2;...]

* <ul>

* <li>traversal size - The number of hits to traverse, otherwise all will be traversed</li>

* <li>highlight - The number of the hits to highlight. Will always be less than or equal to traversal size. Default is Integer.MAX_VALUE (i.e. hits.length())</li>

* <li>maxFrags - The maximum number of fragments to score by the highlighter</li>

* <li>fragSize - The length of fragments</li>

* <li>fields - The fields to highlight. If not specified all fields will be highlighted (or at least attempted)</li>

* </ul>

* Example:

* <pre>"SearchVecHlgtSameRdr" SearchTravRetVectorHighlight(size[10],highlight[10],maxFrags[3],fields[body]) > : 1000

* </pre>

* Fields must be stored and term vector offsets and positions in order must be true for this task to work.

* Other side effects: counts additional 1 (record) for each traversed hit,

* and 1 more for each retrieved (non null) document and 1 for each fragment returned.

public class SearchTravRetVectorHighlightTask extends SearchTravTask {

protected int numToHighlight = Integer.MAX_VALUE;

protected int maxFrags = 2;

protected int fragSize = 100;

protected Set<String> paramFields = Collections.emptySet();

protected FastVectorHighlighter highlighter;

public SearchTravRetVectorHighlightTask(PerfRunData runData) {

super(runData);

}

@Override

public void setup() throws Exception {

super.setup();

//check to make sure either the doc is being stored

PerfRunData data = getRunData();

if (data.getConfig().get("doc.stored", false) == false){

throw new Exception("doc.stored must be set to true");

}

if (data.getConfig().get("doc.term.vector.offsets", false) == false){

throw new Exception("doc.term.vector.offsets must be set to true");

}

if (data.getConfig().get("doc.term.vector.positions", false) == false){

throw new Exception("doc.term.vector.positions must be set to true");

}

@Override

public boolean withRetrieve() {

return true;

}

@Override

public int numToHighlight() {

return numToHighlight;

}

@Override

protected BenchmarkHighlighter getBenchmarkHighlighter(Query q){

highlighter = new FastVectorHighlighter( false, false );

final Query myq = q;

return new BenchmarkHighlighter(){

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@Override

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public int doHighlight(IndexReader reader, int doc, String field,

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Document document, Analyzer analyzer, String text) throws Exception {

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final FieldQuery fq = highlighter.getFieldQuery( myq, reader);

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String[] fragments = highlighter.getBestFragments(fq, reader, doc, field, fragSize, maxFrags);

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return fragments != null ? fragments.length : 0;

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}

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};

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}

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@Override

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protected Collection<String> getFieldsToHighlight(Document document) {

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Collection<String> result = super.getFieldsToHighlight(document);

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//if stored is false, then result will be empty, in which case just get all the param fields

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if (paramFields.isEmpty() == false && result.isEmpty() == false) {

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result.retainAll(paramFields);

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} else {

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result = paramFields;

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}

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return result;

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}

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@Override

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public void setParams(String params) {

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super.setParams(params);

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String [] splits = params.split(",");

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for (int i = 0; i < splits.length; i++) {

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if (splits[i].startsWith("size[") == true){

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traversalSize = (int)Float.parseFloat(splits[i].substring("size[".length(),splits[i].length() - 1));

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} else if (splits[i].startsWith("highlight[") == true){

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numToHighlight = (int)Float.parseFloat(splits[i].substring("highlight[".length(),splits[i].length() - 1));

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} else if (splits[i].startsWith("maxFrags[") == true){

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maxFrags = (int)Float.parseFloat(splits[i].substring("maxFrags[".length(),splits[i].length() - 1));

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} else if (splits[i].startsWith("fragSize[") == true){

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fragSize = (int)Float.parseFloat(splits[i].substring("fragSize[".length(),splits[i].length() - 1));

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} else if (splits[i].startsWith("fields[") == true){

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paramFields = new HashSet<String>();

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String fieldNames = splits[i].substring("fields[".length(), splits[i].length() - 1);

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String [] fieldSplits = fieldNames.split(";");

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for (int j = 0; j < fieldSplits.length; j++) {

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paramFields.add(fieldSplits[j]);

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}

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}

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}

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}

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}

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