/*
    * 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.Writer;
  
  import org.apache.logging.log4j.core.Appender;
  import org.apache.logging.log4j.core.Filter;
  import org.apache.logging.log4j.core.StringLayout;
  import org.apache.logging.log4j.core.config.plugins.Plugin;
  import org.apache.logging.log4j.core.config.plugins.PluginBuilderFactory;
  import org.apache.logging.log4j.core.config.plugins.PluginFactory;
  import org.apache.logging.log4j.core.layout.PatternLayout;
  import org.apache.logging.log4j.core.util.CloseShieldWriter;
  
  /**
   * Appends log events to a {@link Writer}.
   */
  @Plugin(name = "Writer", category = "Core", elementType = Appender.ELEMENT_TYPE, printObject = true)
  public final class WriterAppender extends AbstractWriterAppender<WriterManager> {
  
      /**
       * Builds WriterAppender instances.
       */
      public static class Builder implements org.apache.logging.log4j.core.util.Builder<WriterAppender> {
  
          private Filter filter;
  
          private boolean follow = false;
  
          private boolean ignoreExceptions = true;
  
          private StringLayout layout = PatternLayout.createDefaultLayout();
  
          private String name;
  
          private Writer target;
  
          @Override
          public WriterAppender build() {
              return new WriterAppender(name, layout, filter, getManager(target, follow, layout), ignoreExceptions);
          }
  
          public Builder setFilter(final Filter aFilter) {
              this.filter = aFilter;
              return this;
          }
  
          public Builder setFollow(final boolean shouldFollow) {
              this.follow = shouldFollow;
              return this;
          }
  
          public Builder setIgnoreExceptions(final boolean shouldIgnoreExceptions) {
              this.ignoreExceptions = shouldIgnoreExceptions;
              return this;
          }
  
          public Builder setLayout(final StringLayout aLayout) {
              this.layout = aLayout;
              return this;
          }
  
          public Builder setName(final String aName) {
              this.name = aName;
              return this;
          }
  
          public Builder setTarget(final Writer aTarget) {
              this.target = aTarget;
              return this;
          }
      }
      /**
       * Holds data to pass to factory method.
       */
      private static class FactoryData {
          private final StringLayout layout;
          private final String name;
          private final Writer writer;
  
          /**
           * Builds instances.
           * 
           * @param writer
          *            The OutputStream.
          * @param type
          *            The name of the target.
          * @param layout
          *            A String layout
          */
         public FactoryData(final Writer writer, final String type, final StringLayout layout) {
             this.writer = writer;
             this.name = type;
             this.layout = layout;
         }
     }
 
     private static class WriterManagerFactory implements ManagerFactory<WriterManager, FactoryData> {
 
         /**
          * Creates a WriterManager.
          * 
          * @param name
          *            The name of the entity to manage.
          * @param data
          *            The data required to create the entity.
          * @return The WriterManager
          */
         @Override
         public WriterManager createManager(final String name, final FactoryData data) {
             return new WriterManager(data.writer, data.name, data.layout, true);
         }
     }
 
     private static WriterManagerFactory factory = new WriterManagerFactory();
 
     /**
      * Creates a WriterAppender.
      * 
      * @param layout
      *            The layout to use or null to get the default layout.
      * @param filter
      *            The Filter or null.
      * @param target
      *            The target Writer
      * @param follow
      *            If true will follow changes to the underlying output stream.
      *            Use false as the default.
      * @param name
      *            The name of the Appender (required).
      * @param ignore
      *            If {@code "true"} (default) exceptions encountered when
      *            appending events are logged; otherwise they are propagated to
      *            the caller. Use true as the default.
      * @return The ConsoleAppender.
      */
     @PluginFactory
     public static WriterAppender createAppender(StringLayout layout, final Filter filter, final Writer target,
             final String name, final boolean follow, final boolean ignore) {
         if (name == null) {
             LOGGER.error("No name provided for WriterAppender");
             return null;
         }
         if (layout == null) {
             layout = PatternLayout.createDefaultLayout();
         }
         return new WriterAppender(name, layout, filter, getManager(target, follow, layout), ignore);
     }
 
     private static WriterManager getManager(final Writer target, final boolean follow, final StringLayout layout) {
         final Writer writer = new CloseShieldWriter(target);
         final String managerName = target.getClass().getName() + "@" + Integer.toHexString(target.hashCode()) + '.'
                 + follow;
         return WriterManager.getManager(managerName, new FactoryData(writer, managerName, layout), factory);
     }
 
     @PluginBuilderFactory
     public static Builder newBuilder() {
         return new Builder();
     }
 
     private WriterAppender(final String name, final StringLayout layout, final Filter filter,
             final WriterManager manager, final boolean ignoreExceptions) {
         super(name, layout, filter, ignoreExceptions, true, manager);
     }
 
 }