spork-master/src/org/apache/pig/builtin/Assert.java
/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.pig.builtin;

import java.io.IOException;

import org.apache.pig.EvalFunc;
import org.apache.pig.FilterFunc;
import org.apache.pig.data.Tuple;

/**
 * 
 *
 */
public class Assert extends EvalFunc<Boolean>
{
  @Override
  public Boolean exec(Tuple tuple)
      throws IOException
  {
    if (!(Boolean) tuple.get(0)) {
      if (tuple.size() > 1) {
        throw new IOException("Assertion violated: " + tuple.get(1).toString());
      }
      else {
        throw new IOException("Assertion violated. ");
      }
    }
    else {
      return true;
    }
  }

  @Override
  public boolean allowCompileTimeCalculation() {
      return true;
  }
}
