/*
    * 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.logging.log4j.core.appender;
  
  import java.io.Serializable;
  import java.util.HashMap;
  import java.util.Map;
  import java.util.concurrent.TimeUnit;
  
  import org.apache.logging.log4j.core.Appender;
  import org.apache.logging.log4j.core.Core;
  import org.apache.logging.log4j.core.Filter;
  import org.apache.logging.log4j.core.Layout;
  import org.apache.logging.log4j.core.config.Configuration;
  import org.apache.logging.log4j.core.config.plugins.Plugin;
  import org.apache.logging.log4j.core.config.plugins.PluginBuilderAttribute;
  import org.apache.logging.log4j.core.config.plugins.PluginBuilderFactory;
  import org.apache.logging.log4j.core.config.plugins.validation.constraints.Required;
  import org.apache.logging.log4j.core.net.Advertiser;
  import org.apache.logging.log4j.core.util.Booleans;
  import org.apache.logging.log4j.core.util.Integers;
  
  /**
   * File Appender.
   */
  @Plugin(name = FileAppender.PLUGIN_NAME, category = Core.CATEGORY_NAME, elementType = Appender.ELEMENT_TYPE, printObject = true)
  public final class FileAppender extends AbstractOutputStreamAppender<FileManager> {
  
      public static final String PLUGIN_NAME = "File";
  
      /**
       * Builds FileAppender instances.
       * 
       * @param <B>
       *            The type to build
       */
      public static class Builder<B extends Builder<B>> extends AbstractOutputStreamAppender.Builder<B>
              implements org.apache.logging.log4j.core.util.Builder<FileAppender> {
  
          @PluginBuilderAttribute
          @Required
          private String fileName;
  
          @PluginBuilderAttribute
          private boolean append = true;
  
          @PluginBuilderAttribute
          private boolean locking;
  
          @PluginBuilderAttribute
          private boolean advertise;
  
          @PluginBuilderAttribute
          private String advertiseUri;
  
          @PluginBuilderAttribute
          private boolean createOnDemand;
  
          @PluginBuilderAttribute
          private String filePermissions;
  
          @PluginBuilderAttribute
          private String fileOwner;
  
          @PluginBuilderAttribute
          private String fileGroup;
  
          @Override
          public FileAppender build() {
              boolean bufferedIo = isBufferedIo();
              final int bufferSize = getBufferSize();
              if (locking && bufferedIo) {
                  LOGGER.warn("Locking and buffering are mutually exclusive. No buffering will occur for {}", fileName);
                  bufferedIo = false;
              }
              if (!bufferedIo && bufferSize > 0) {
                  LOGGER.warn("The bufferSize is set to {} but bufferedIo is false: {}", bufferSize, bufferedIo);
              }
              final Layout<? extends Serializable> layout = getOrCreateLayout();
  
              final FileManager manager = FileManager.getFileManager(fileName, append, locking, bufferedIo, createOnDemand,
                      advertiseUri, layout, bufferSize, filePermissions, fileOwner, fileGroup, getConfiguration());
              if (manager == null) {
                  return null;
              }
 
             return new FileAppender(getName(), layout, getFilter(), manager, fileName, isIgnoreExceptions(),
                     !bufferedIo || isImmediateFlush(), advertise ? getConfiguration().getAdvertiser() : null);
         }
 
         public String getAdvertiseUri() {
             return advertiseUri;
         }
 
         public String getFileName() {
             return fileName;
         }
 
         public boolean isAdvertise() {
             return advertise;
         }
 
         public boolean isAppend() {
             return append;
         }
 
         public boolean isCreateOnDemand() {
             return createOnDemand;
         }
 
         public boolean isLocking() {
             return locking;
         }
 
         public String getFilePermissions() {
             return filePermissions;
         }
 
         public String getFileOwner() {
             return fileOwner;
         }
 
         public String getFileGroup() {
             return fileGroup;
         }
 
         public B withAdvertise(final boolean advertise) {
             this.advertise = advertise;
             return asBuilder();
         }
 
         public B withAdvertiseUri(final String advertiseUri) {
             this.advertiseUri = advertiseUri;
             return asBuilder();
         }
 
         public B withAppend(final boolean append) {
             this.append = append;
             return asBuilder();
         }
 
         public B withFileName(final String fileName) {
             this.fileName = fileName;
             return asBuilder();
         }
 
         public B withCreateOnDemand(final boolean createOnDemand) {
             this.createOnDemand = createOnDemand;
             return asBuilder();
         }
 
         public B withLocking(final boolean locking) {
             this.locking = locking;
             return asBuilder();
         }
 
         public B withFilePermissions(final String filePermissions) {
             this.filePermissions = filePermissions;
             return asBuilder();
         }
 
         public B withFileOwner(final String fileOwner) {
             this.fileOwner = fileOwner;
             return asBuilder();
         }
 
         public B withFileGroup(final String fileGroup) {
             this.fileGroup = fileGroup;
             return asBuilder();
         }
 
     }
     
     private static final int DEFAULT_BUFFER_SIZE = 8192;
     
     /**
      * Create a File Appender.
      * @param fileName The name and path of the file.
      * @param append "True" if the file should be appended to, "false" if it should be overwritten.
      * The default is "true".
      * @param locking "True" if the file should be locked. The default is "false".
      * @param name The name of the Appender.
      * @param immediateFlush "true" if the contents should be flushed on every write, "false" otherwise. The default
      * is "true".
      * @param ignoreExceptions If {@code "true"} (default) exceptions encountered when appending events are logged; otherwise
      *               they are propagated to the caller.
      * @param bufferedIo "true" if I/O should be buffered, "false" otherwise. The default is "true".
      * @param bufferSizeStr buffer size for buffered IO (default is 8192).
      * @param layout The layout to use to format the event. If no layout is provided the default PatternLayout
      * will be used.
      * @param filter The filter, if any, to use.
      * @param advertise "true" if the appender configuration should be advertised, "false" otherwise.
      * @param advertiseUri The advertised URI which can be used to retrieve the file contents.
      * @param config The Configuration
      * @return The FileAppender.
      * @deprecated Use {@link #newBuilder()}
      */
     @Deprecated
     public static <B extends Builder<B>> FileAppender createAppender(
             // @formatter:off
             final String fileName,
             final String append,
             final String locking,
             final String name,
             final String immediateFlush,
             final String ignoreExceptions,
             final String bufferedIo,
             final String bufferSizeStr,
             final Layout<? extends Serializable> layout,
             final Filter filter,
             final String advertise,
             final String advertiseUri,
             final Configuration config) {
         return FileAppender.<B>newBuilder()
             .withAdvertise(Boolean.parseBoolean(advertise))
             .withAdvertiseUri(advertiseUri)
             .withAppend(Booleans.parseBoolean(append, true))
             .withBufferedIo(Booleans.parseBoolean(bufferedIo, true))
             .withBufferSize(Integers.parseInt(bufferSizeStr, DEFAULT_BUFFER_SIZE))
             .setConfiguration(config)
             .withFileName(fileName)
             .withFilter(filter)
             .withIgnoreExceptions(Booleans.parseBoolean(ignoreExceptions, true))
             .withImmediateFlush(Booleans.parseBoolean(immediateFlush, true))
             .withLayout(layout)
             .withLocking(Boolean.parseBoolean(locking))
             .withName(name)
             .build();
         // @formatter:on
     }
     
     @PluginBuilderFactory
     public static <B extends Builder<B>> B newBuilder() {
         return new Builder<B>().asBuilder();
     }
     
     private final String fileName;
 
     private final Advertiser advertiser;
 
     private final Object advertisement;
 
     private FileAppender(final String name, final Layout<? extends Serializable> layout, final Filter filter,
             final FileManager manager, final String filename, final boolean ignoreExceptions,
             final boolean immediateFlush, final Advertiser advertiser) {
 
         super(name, layout, filter, ignoreExceptions, immediateFlush, manager);
         if (advertiser != null) {
             final Map<String, String> configuration = new HashMap<>(layout.getContentFormat());
             configuration.putAll(manager.getContentFormat());
             configuration.put("contentType", layout.getContentType());
             configuration.put("name", name);
             advertisement = advertiser.advertise(configuration);
         } else {
             advertisement = null;
         }
         this.fileName = filename;
         this.advertiser = advertiser;
     }
 
     /**
      * Returns the file name this appender is associated with.
      * @return The File name.
      */
     public String getFileName() {
         return this.fileName;
     }
 
     @Override
     public boolean stop(final long timeout, final TimeUnit timeUnit) {
         setStopping();
         super.stop(timeout, timeUnit, false);
         if (advertiser != null) {
             advertiser.unadvertise(advertisement);
         }
         setStopped();
         return true;
     }
 }