import com.orientechnologies.orient.core.sql.OSQLEngine; //导入依赖的package包/类
private void registerCustomFunctions(final Iterable<OSQLFunctionAbstract> functions) {
  log.debug("Registering custom OrientDB functions");
  for (OSQLFunctionAbstract function : functions) {
    log.debug("Registering OrientDB function " + function.getName());
    OSQLEngine.getInstance().registerFunction(function.getName(), function);
  }
}
 

import com.orientechnologies.orient.core.sql.OSQLEngine; //导入依赖的package包/类
@Override
public Object evaluateRecord(OIdentifiable iRecord, ODocument iCurrentResult, OSQLFilterCondition iCondition, Object iLeft,
    Object iRight, OCommandContext iContext) {

  OSQLFunction function = OSQLEngine.getInstance().getFunction(keyword);
  return function.execute(this, iRecord, iCurrentResult, new Object[] { iLeft, iCondition.getRight() }, iContext);
}
 

import com.orientechnologies.orient.core.sql.OSQLEngine; //导入依赖的package包/类
private static void registerGraphFunctions() {
	OGraphFunctionFactory graphFunctions = new OGraphFunctionFactory();
	Set<String> names = graphFunctions.getFunctionNames();
	
	for (String name : names) {
		System.out.println("Enabling ODB graph function: [" + name + "]");
		OSQLEngine.getInstance().registerFunction(name, graphFunctions.createFunction(name)); 
		OSQLFunction function = OSQLEngine.getInstance().getFunction(name);
		if (function != null) {
			// Dummy call, just to ensure that the class is loaded
			function.getSyntax();
		}
	}
}
 

import com.orientechnologies.orient.core.sql.OSQLEngine; //导入依赖的package包/类
@Override
public void startup() {
  super.startup();
  Orient.instance().addDbLifecycleListener(this);

  OIndexes.registerFactory(new OLuceneIndexFactory(true));
  OSQLEngine.registerOperator(new OLuceneTextOperator());
  OSQLEngine.registerOperator(new OLuceneWithinOperator());
  OSQLEngine.registerOperator(new OLuceneNearOperator());
  OLogManager.instance().info(this, "Lucene index plugin installed and active. Lucene version: %s",
      OLuceneIndexManagerAbstract.LUCENE_VERSION);
}
 

import com.orientechnologies.orient.core.sql.OSQLEngine; //导入依赖的package包/类
protected void registerOperators() {

    for (OQueryOperator operator : OLuceneSpatialOperatorFactory.OPERATORS) {
      OSQLEngine.registerOperator(operator);
    }

  }
 

import com.orientechnologies.orient.core.sql.OSQLEngine; //导入依赖的package包/类
protected void registerFunctions() {

    for (String s : OSpatialFunctionsFactory.FUNCTIONS.keySet()) {
      OSQLEngine.getInstance().registerFunction(s, (OSQLFunction) OSpatialFunctionsFactory.FUNCTIONS.get(s));
    }

  }