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From ottobackwards <...@git.apache.org>
Subject [GitHub] metron pull request #884: METRON-1382 Run Stellar in a Zeppelin Notebook
Date Fri, 05 Jan 2018 16:57:15 GMT
Github user ottobackwards commented on a diff in the pull request:

    https://github.com/apache/metron/pull/884#discussion_r159921114
  
    --- Diff: metron-stellar/stellar-common/src/main/java/org/apache/metron/stellar/common/shell/StellarResult.java
---
    @@ -0,0 +1,185 @@
    +/*
    + *
    + *  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.metron.stellar.common.shell;
    +
    +import java.util.Optional;
    +
    +/**
    + * The result of executing a Stellar expression within a StellarShellExecutor.
    + */
    +public class StellarResult {
    +
    +  /**
    +   * Indicates that a Stellar expression resulted in either
    +   * success or an error.
    +   */
    +  enum Status {
    +    SUCCESS,
    +    ERROR,
    +    TERMINATE
    +  }
    +
    +  /**
    +   * Indicates either success or failure of executing the expression.
    +   */
    +  private Status status;
    +
    +  /**
    +   * The result of executing the expression.  Only valid when execution is successful.
    +   */
    +  private Optional<Object> value;
    +
    +  /**
    +   * The error that occurred when executing the expression.  Only valid when execution
results in an error.
    +   */
    +  private Optional<Throwable> exception;
    +
    +  /**
    +   * Indicates if the value is null;
    +   *
    +   * A null is a valid result, but cannot be unwrapped from an Optional.  Because of
this
    +   * a boolean is used to indicate if the result is a success and the value is null.
    +   */
    +  private boolean isValueNull;
    +
    +  /**
    +   * Private constructor to construct a result indicate success. Use the static methods;
success.
    +   *
    +   * @param status Indicates success or failure.
    +   * @param value The value of executing the expression.
    +   */
    +  private StellarResult(Status status, Object value) {
    +    this.status = status;
    +    this.value = Optional.ofNullable(value);
    +    this.exception = Optional.empty();
    +    this.isValueNull = (value == null);
    --- End diff --
    
    && status == Status.SUCESS ?


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