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/*
 * Copyright 2016 Objectos, Fábrica de Software LTDA.
 *
 * 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 br.com.objectos.http;

import java.io.IOException;

/**
 * @author [email protected] (Marcio Endo)
 */
public abstract class Header implements SocketWritable {

  private final String name;

  private Header(String name) {
    this.name = name;
  }

  public static Header contentLength(long size) {
    return new LongHeader("Content-length", size);
  }

  public static Header contentType(ContentType type) {
    return new SocketWritableHeader("Content-type", type);
  }

  @Override
  public void writeTo(SocketWriter writer) throws IOException {
    writer.writeString(name);
    writer.writeString(": ");
    writeValue(writer);
  }

  abstract void writeValue(SocketWriter writer) throws IOException;

  private static class LongHeader extends Header {

    private final long value;

    public LongHeader(String name, long value) {
      super(name);
      this.value = value;
    }

    @Override
    void writeValue(SocketWriter writer) throws IOException {
      writer.writeString(Long.toString(value));
    }

  }

  private static class SocketWritableHeader extends Header {

    private final SocketWritable value;

    public SocketWritableHeader(String name, SocketWritable value) {
      super(name);
      this.value = value;
    }

    @Override
    void writeValue(SocketWriter writer) throws IOException {
      value.writeTo(writer);
    }

  }

}