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A lightweight,high performance expression evaluator for java
There is a newer version: 5.4.3
/**
 * Copyright (C) 2010 dennis zhuang ([email protected])
 *
 * This library is free software; you can redistribute it and/or modify it under the terms of the
 * GNU Lesser General Public License as published by the Free Software Foundation; either version
 * 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
 * even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License along with this program;
 * if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 **/
package com.googlecode.aviator;

import java.util.List;
import java.util.Map;
import com.googlecode.aviator.exception.ExpressionNotFoundException;
import com.googlecode.aviator.exception.ExpressionRuntimeException;
import com.googlecode.aviator.lexer.SymbolTable;
import com.googlecode.aviator.runtime.LambdaFunctionBootstrap;
import com.googlecode.aviator.runtime.RuntimeUtils;
import com.googlecode.aviator.runtime.function.LambdaFunction;
import com.googlecode.aviator.utils.Env;
import com.googlecode.aviator.utils.Reflector;


/**
 * Compiled expression,all generated class inherit this class
 *
 * @author dennis
 *
 */
public abstract class ClassExpression extends BaseExpression {

  protected Map lambdaBootstraps;


  public Map getLambdaBootstraps() {
    return this.lambdaBootstraps;
  }

  public void setLambdaBootstraps(final Map lambdaBootstraps) {
    this.lambdaBootstraps = lambdaBootstraps;
  }

  public ClassExpression(final AviatorEvaluatorInstance instance, final List varNames,
      final SymbolTable symbolTable) {
    super(instance, varNames, symbolTable);
  }

  public LambdaFunction newLambda(final Env env, final String name) {
    LambdaFunctionBootstrap bootstrap = this.lambdaBootstraps.get(name);
    if (bootstrap == null) {
      throw new ExpressionNotFoundException("Lambda " + name + " not found");
    }
    return bootstrap.newInstance(env);
  }

  @Override
  public Object executeDirectly(final Map env) {
    try {
      Object result = execute0((Env) env);
      if (RuntimeUtils.isTracedEval(env)) {
        RuntimeUtils.printlnTrace(env, "Result : " + result);
      }
      return result;
    } catch (ExpressionRuntimeException e) {
      throw e;
    } catch (Throwable t) {
      throw Reflector.sneakyThrow(t);
    }
  }


  public abstract Object execute0(Env env);


  /**
   * Get generated java class
   *
   * @return
   */
  public Class getJavaClass() {
    return this.getClass();
  }
}