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// Licensed to the Software Freedom Conservancy (SFC) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The SFC 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.openqa.grid.common;

import org.openqa.grid.common.exception.GridConfigurationException;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

public class CommandLineOptionHelper {

  private String[] args;

  @SuppressWarnings("unused")
  private CommandLineOptionHelper() {

  }

  public CommandLineOptionHelper(String[] args) {
    this.args = args;
  }

  public boolean isParamPresent(String name) {
    for (String arg : args) {
      if (name.equalsIgnoreCase(arg)) {
        return true;
      }
    }
    return false;
  }

  public boolean hasParamValue(String name) {
    int index = -1;
    for (int i = 0; i < args.length; i++) {
      if (name.equals(args[i])) {
        index = i;
        break;
      }
    }
    if (index == -1) {
      throw new GridConfigurationException("The parameter " + name + " isn't specified.");
    }

    if (args.length == index) {
      return false;
    }

    if (((index + 1) < args.length) && !args[index + 1].startsWith("-")) {
      return true;
    } else {
      return false;
    }
  }

  public String getParamValue(String name) {
    int index = -1;
    for (int i = 0; i < args.length; i++) {
      if (name.equals(args[i])) {
        index = i;
        break;
      }
    }
    if (index == -1) {
      throw new GridConfigurationException("The parameter " + name + " isn't specified.");
    }
    if (args.length == index) {
      throw new GridConfigurationException("The parameter " + name +
          " doesn't have a value specified.");
    }

    if (((index + 1) < args.length) && !args[index + 1].startsWith("-")) {
      return args[index + 1];
    } else {
      return "";
    }
  }

  public List getParamValues(String name) {
    if (isParamPresent(name)) {
      String value = getParamValue(name);
      return Arrays.asList(value.split(","));
    } else {
      return new ArrayList<>();
    }

  }

  /**
   * get all occurrences of -name
   *
   * @param name
   * @return A List of Strings that have the passed name argument in them.
   */
  public List getAll(String name) {
    List res = new ArrayList<>();
    for (int i = 0; i < args.length; i++) {
      if (name.equals(args[i])) {
        res.add(args[i + 1]);
      }
    }
    return res;
  }

  public List getKeys() {
    List keys = new ArrayList<>();
    for (String arg : args) {
      if (arg.startsWith("-")) {
        keys.add(arg);
      }
    }
    return keys;
  }

}