package org.pirkaengine.core.expression;
import java.lang.reflect.InvocationTargetException;
import java.util.Map;
import org.pirkaengine.core.script.Invoker;
import org.pirkaengine.core.script.InvokerFactory;
import org.pirkaengine.core.script.ScriptEngineException;
/**
* 関数エンジンインターフェイス．
* @author shuji.w6e
* @since 0.1.0
*/
public class FunctionEngine {
private final ExpressionEngine expressionEngine;
/**
* @param expressionEngine
*/
public FunctionEngine(ExpressionEngine expressionEngine) {
if (expressionEngine == null) throw new IllegalArgumentException("expressionEngine is null.");
this.expressionEngine = expressionEngine;
}
/**
* スクリプトを実行する．
* @param script スクリプト
* @param model
* @param functions 外部定義関数
* @return スクリプトの戻り値
* @throws ScriptEngineException
*/
public Object eval(String script, Map<String, Object> model, Map<String, Function> functions)
throws ScriptEngineException {
if (script == null) throw new IllegalArgumentException("script is null.");
if (model == null) throw new IllegalArgumentException("model == null");
if (functions == null) throw new IllegalArgumentException("functions == null");
String funcName = Functions.getName(script);
Function function = functions.get(funcName);
if (function == null) throw new EvalException("function is not found: " + funcName);
if (function.language == null) throw new EvalException("function.language is null: " + funcName);
try {
Invoker invoker = InvokerFactory.getInstance().getInvoker(function);
Object[] params = createParams(script, model, functions);
return invoker.invoke(function, params);
} catch (SecurityException e) {
throw new EvalException("function:" + function, e);
} catch (IllegalArgumentException e) {
throw new EvalException("function:" + function, e);
} catch (NoSuchMethodException e) {
throw new EvalException("function:" + function, e);
} catch (IllegalAccessException e) {
throw new EvalException("function:" + function, e);
} catch (InvocationTargetException e) {
throw new EvalException("function:" + function, e);
} catch (NoSuchFieldException e) {
throw new EvalException("function:" + function, e);
}
}
private Object[] createParams(String script, Map<String, Object> model,
Map<String, Function> functions) throws SecurityException, IllegalArgumentException, NoSuchMethodException,
IllegalAccessException, InvocationTargetException, NoSuchFieldException {
String[] paramsStr = Functions.getParams(script);
Object[] params = new Object[paramsStr.length];
for (int i = 0; i < paramsStr.length; i++) {
params[i] = expressionEngine.getValue(paramsStr[i], model, functions);
}
return params;
}
}