Adding boost factors at runtime

solr_boost_snippet.java

		for (String assetType : assetTypes) {
			BooleanQuery assetTypeQuery = BooleanQueryFactoryUtil.create(context);
			assetTypesQuery.add(assetTypeQuery, BooleanClauseOccur.SHOULD);

			if( (assetBoostFactors != null)
				 && (index <= assetBoostFactors.length)) {
				int boost = assetBoostFactors[index];
				Class clazz = assetTypesQuery.getClass();
				//Note: can't do instanceOf since BQI is in portal-impl
				if ("com.liferay.portal.search.lucene.BooleanQueryImpl".equals(clazz.getName())) {
					try {
						java.lang.reflect.Field field = clazz.getDeclaredField("_booleanQuery");
						field.setAccessible(true);
						Object bq = field.get(assetTypeQuery);

						java.lang.reflect.Field field2  = bq.getClass().getSuperclass().getDeclaredField("boost");
						field2.setAccessible(true);
						field2.setFloat(bq, boost);
					}
					catch (Exception e) {
						_log.debug("Unable to set boost: ", e);
					}
				}
				else {
					_log.debug("Wrong implementation, cannot set boost: " + clazz.getName());
				}
			}