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/*
Copyright 2011 WebDriver committers
Copyright 2011 Software Freedom Conservancy

Licensed 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 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 occurences of -name
   * 
   * @param name
   * @return
   */
  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;
  }

}