/*
    * 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.message;
  
  import java.util.ArrayList;
  import java.util.Iterator;
  import java.util.List;
  
  import org.apache.logging.log4j.util.StringBuilderFormattable;
  
  /**
   * A collection of StructuredDataMessages.
   */
  public class StructuredDataCollectionMessage implements StringBuilderFormattable,
          MessageCollectionMessage<StructuredDataMessage> {
      private static final long serialVersionUID = 5725337076388822924L;
  
      private final List<StructuredDataMessage> structuredDataMessageList;
  
      public StructuredDataCollectionMessage(final List<StructuredDataMessage> messages) {
          this.structuredDataMessageList = messages;
      }
  
      @Override
      public Iterator<StructuredDataMessage> iterator() {
          return structuredDataMessageList.iterator();
      }
  
      @Override
      public String getFormattedMessage() {
          final StringBuilder sb = new StringBuilder();
          formatTo(sb);
          return sb.toString();
      }
  
      @Override
      public String getFormat() {
          final StringBuilder sb = new StringBuilder();
          for (final StructuredDataMessage msg : structuredDataMessageList) {
              if (msg.getFormat() != null) {
                  if (sb.length() > 0) {
                      sb.append(", ");
                  }
                  sb.append(msg.getFormat());
              }
          }
          return sb.toString();
      }
  
      @Override
      public void formatTo(final StringBuilder buffer) {
          for (final StructuredDataMessage msg : structuredDataMessageList) {
              msg.formatTo(buffer);
          }
      }
  
      @Override
      public Object[] getParameters() {
          final List<Object[]> objectList = new ArrayList<>();
          int count = 0;
          for (final StructuredDataMessage msg : structuredDataMessageList) {
              final Object[] objects = msg.getParameters();
              if (objects != null) {
                  objectList.add(objects);
                  count += objects.length;
              }
          }
          final Object[] objects = new Object[count];
          int index = 0;
          for (final Object[] objs : objectList) {
             for (final Object obj : objs) {
                 objects[index++] = obj;
             }
          }
          return objects;
      }
  
      @Override
      public Throwable getThrowable() {
          for (final StructuredDataMessage msg : structuredDataMessageList) {
              final Throwable t = msg.getThrowable();
              if (t != null) {
                  return t;
              }
          }
         return null;
     }
 }