/*
 * 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.ozone.lib.wsrs;

import java.text.MessageFormat;
import java.util.regex.Pattern;
import org.apache.hadoop.hdds.annotation.InterfaceAudience;

/**
 * Strinf parameter.
 */
@InterfaceAudience.Private
public abstract class StringParam extends Param<String> {
  private Pattern pattern;

  public StringParam(String name, String defaultValue) {
    this(name, defaultValue, null);
  }

  public StringParam(String name, String defaultValue, Pattern pattern) {
    super(name, defaultValue);
    this.pattern = pattern;
    parseParam(defaultValue);
  }

  @Override
  public String parseParam(String str) {
    try {
      if (str != null) {
        str = str.trim();
        if (!str.isEmpty()) {
          value = parse(str);
        }
      }
    } catch (Exception ex) {
      throw new IllegalArgumentException(
        MessageFormat.format("Parameter [{0}], invalid value [{1}], " +
                "value must be [{2}]", getName(), str, getDomain()));
    }
    return value;
  }

  @Override
  protected String parse(String str) throws Exception {
    if (pattern != null) {
      if (!pattern.matcher(str).matches()) {
        throw new IllegalArgumentException("Invalid value");
      }
    }
    return str;
  }

  @Override
  protected String getDomain() {
    return (pattern == null) ? "a string" : pattern.pattern();
  }
}
