content: package org.apache.cassandra.stress.settings;
  /*
   * 
   * 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.
   * 
   */
  
  
  import java.io.Serializable;
  import java.util.Collections;
  import java.util.List;
  import java.util.regex.Pattern;
  
  import com.google.common.base.Function;
  
  /**
   * For parsing a simple (sub)option for a command/major option
   */
  class OptionSimple extends Option implements Serializable
  {
  
      final String displayPrefix;
      private final Pattern matchPrefix;
      private final String defaultValue;
      private final Function<String, String> valueAdapter;
      private final String description;
      private final boolean required;
      private String value;
  
      private static final class ValueMatcher implements Function<String, String>, Serializable
      {
          final Pattern pattern;
          private ValueMatcher(Pattern pattern)
          {
              this.pattern = pattern;
          }
          public String apply(String s)
          {
              if (!pattern.matcher(s).matches())
                  throw new IllegalArgumentException("Invalid value " + s + "; must match pattern " + pattern);
              return s;
          }
      }
  
      public OptionSimple(String prefix, String valuePattern, String defaultValue, String description, boolean required)
      {
          this(prefix, Pattern.compile(Pattern.quote(prefix), Pattern.CASE_INSENSITIVE),
               Pattern.compile(valuePattern, Pattern.CASE_INSENSITIVE), defaultValue, description, required);
      }
  
      public OptionSimple(String prefix, Function<String, String> valueAdapter, String defaultValue, String description, boolean required)
      {
          this(prefix, Pattern.compile(Pattern.quote(prefix), Pattern.CASE_INSENSITIVE), valueAdapter, defaultValue, description, required);
      }
  
      public OptionSimple(String displayPrefix, Pattern matchPrefix, Pattern valuePattern, String defaultValue, String description, boolean required)
      {
          this(displayPrefix, matchPrefix, new ValueMatcher(valuePattern), defaultValue, description, required);
      }
  
      public OptionSimple(String displayPrefix, Pattern matchPrefix, Function<String, String> valueAdapter, String defaultValue, String description, boolean required)
      {
          this.displayPrefix = displayPrefix;
          this.matchPrefix = matchPrefix;
          this.valueAdapter = valueAdapter;
          this.defaultValue = defaultValue;
          this.description = description;
          this.required = required;
      }
  
      public boolean setByUser()
      {
          return value != null;
      }
  
      public boolean isRequired()
      {
          return required;
      }
  
      public boolean present()
      {
          return value != null || defaultValue != null;
      }
  
      public String value()
      {
          return value != null ? value : defaultValue;
      }
  
      public boolean accept(String param)
      {
          if (matchPrefix.matcher(param).lookingAt())
          {
              if (value != null)
                  throw new IllegalArgumentException("Suboption " + displayPrefix + " has been specified more than once");
              String v = param.substring(displayPrefix.length());
              value = valueAdapter.apply(v);
              assert value != null;
              return true;
          }
          return false;
      }
  
      @Override
      public boolean happy()
      {
          return !required || value != null;
      }
  
      public String shortDisplay()
      {
          StringBuilder sb = new StringBuilder();
          if (!required)
              sb.append("[");
          sb.append(displayPrefix);
          if (displayPrefix.endsWith("="))
              sb.append("?");
          if (displayPrefix.endsWith("<"))
              sb.append("?");
          if (displayPrefix.endsWith(">"))
              sb.append("?");
          if (!required)
              sb.append("]");
          return sb.toString();
      }
  
      public String longDisplay()
      {
          if (description.equals("") && defaultValue == null
              && (valueAdapter instanceof ValueMatcher && ((ValueMatcher) valueAdapter).pattern.pattern().equals("")))
              return null;
          StringBuilder sb = new StringBuilder();
          sb.append(displayPrefix);
          if (displayPrefix.endsWith("="))
              sb.append("?");
          if (displayPrefix.endsWith("<"))
              sb.append("?");
          if (displayPrefix.endsWith(">"))
              sb.append("?");
          if (defaultValue != null)
          {
              sb.append(" (default=");
              sb.append(defaultValue);
              sb.append(")");
          }
          return GroupedOptions.formatLong(sb.toString(), description);
      }
  
      public String getOptionAsString()
      {
          StringBuilder sb = new StringBuilder();
          sb.append(displayPrefix);
  
          if (!(displayPrefix.endsWith("=") || displayPrefix.endsWith("<") || displayPrefix.endsWith(">")))
          {
              sb.append(setByUser() ? ":*set*" : ":*not set*");
          }else{
              sb.append(value == null ? defaultValue : value);
          }
          return sb.toString();
      }
  
      public List<String> multiLineDisplay()
      {
          return Collections.emptyList();
      }
  
      public int hashCode()
      {
          return displayPrefix.hashCode();
      }
  
      @Override
      public boolean equals(Object that)
      {
          return that instanceof OptionSimple && ((OptionSimple) that).displayPrefix.equals(this.displayPrefix);
      }
  
  }
  