/**
 * 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.kerby.has.server.web.rest.param;

import java.util.regex.Pattern;

/**
 * String parameter.
 */
abstract class StringParam extends Param<String, StringParam.Domain> {
  StringParam(final Domain domain, String str) {
    super(domain, domain.parse(str));
  }

  /**
   * @return the parameter value as a string
   */
  @Override
  public String getValueString() {
    return value;
  }

  /**
   * The domain of the parameter.
   */
  static final class Domain extends Param.Domain<String> {
    /**
     * The pattern defining the domain; null .
     */
    private final Pattern pattern;

    Domain(final String paramName, final Pattern pattern) {
      super(paramName);
      this.pattern = pattern;
    }

    @Override
    public String getDomain() {
      return pattern == null ? "<String>" : pattern.pattern();
    }

    @Override
    String parse(String str) {
      if (str != null && pattern != null && !pattern.matcher(str).matches()) {
        throw new IllegalArgumentException("Invalid value: \"" + str
            + "\" does not belong to the domain " + getDomain());
      }
      return str;
    }
  }
}
