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/*
 * Copyright 2017, OnGres.
 *
 * Redistribution and use in source and binary forms, with or without modification, are permitted provided that the
 * following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following
 * disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the
 * following disclaimer in the documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */


package com.impossibl.postgres.protocol.sasl.scram;


import com.impossibl.postgres.protocol.sasl.scram.exception.ScramParseException;
import com.impossibl.postgres.protocol.sasl.scram.util.AbstractCharAttributeValue;

import static com.impossibl.postgres.protocol.sasl.scram.util.Preconditions.checkNotNull;


/**
 * Parse and write SCRAM Attribute-Value pairs.
 */
public class ScramAttributeValue extends AbstractCharAttributeValue {
  public ScramAttributeValue(ScramAttributes attribute, String value) {
    super(attribute, checkNotNull(value, "value"));
  }

  public static StringBuffer writeTo(StringBuffer sb, ScramAttributes attribute, String value) {
    return new ScramAttributeValue(attribute, value).writeTo(sb);
  }

  /**
   * Parses a potential ScramAttributeValue String.
   * @param value The string that contains the Attribute-Value pair.
   * @return The parsed class
   * @throws ScramParseException If the argument is empty or an invalid Attribute-Value
   */
  public static ScramAttributeValue parse(String value) throws ScramParseException {
    if (null == value || value.length() < 3 || value.charAt(1) != '=') {
      throw new ScramParseException("Invalid ScramAttributeValue '" + value + "'");
    }

    return new ScramAttributeValue(ScramAttributes.byChar(value.charAt(0)), value.substring(2));
  }
}