content: /*****************************************************************
   *   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
   *
   *    https://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.cayenne.util;
  
  import java.util.Collection;
  import java.util.Map;
  
  /**
   * A utility class to simplify implementation of Object toString methods. This
   * implementation is a trimmed version of commons-lang ToStringBuilder.
   * 
   * @since 3.0
   */
  public class ToStringBuilder {
  
      protected StringBuilder buffer;
      protected Object object;
      protected int fieldCount;
  
      public ToStringBuilder(Object object) {
          this.object = object;
          this.buffer = new StringBuilder(128);
  
          appendClassName();
          appendIdentityHashCode();
          buffer.append('[');
      }
  
      public ToStringBuilder append(String fieldName, Object value) {
  
          if (fieldCount++ > 0) {
              buffer.append(',');
          }
  
          buffer.append(fieldName).append('=');
  
          if (value == null) {
              buffer.append("<null>");
          }
          else {
              appendDetail(value);
          }
  
          return this;
      }
  
      protected void appendDetail(Object value) {
  
          if (value instanceof Collection) {
              buffer.append(value);
          }
          else if (value instanceof Map) {
              buffer.append(value);
          }
          else if (value instanceof long[]) {
              appendArray((long[]) value);
          }
          else if (value instanceof int[]) {
              appendArray((int[]) value);
          }
          else if (value instanceof short[]) {
              appendArray((short[]) value);
          }
          else if (value instanceof byte[]) {
              appendArray((byte[]) value);
          }
          else if (value instanceof char[]) {
              appendArray((char[]) value);
          }
          else if (value instanceof double[]) {
              appendArray((double[]) value);
          }
          else if (value instanceof float[]) {
              appendArray((float[]) value);
          }
          else if (value instanceof boolean[]) {
              appendArray((boolean[]) value);
          }
          else if (value.getClass().isArray()) {
              appendArray((Object[]) value);
          }
          else {
              buffer.append(value);
          }
      }
  
      protected void appendArray(short[] array) {
          buffer.append('{');
          for (int i = 0; i < array.length; i++) {
              if (i > 0) {
                  buffer.append(',');
              }
              buffer.append(array[i]);
          }
          buffer.append('}');
      }
  
      protected void appendArray(int[] array) {
          buffer.append('{');
          for (int i = 0; i < array.length; i++) {
              if (i > 0) {
                  buffer.append(',');
              }
              buffer.append(array[i]);
          }
          buffer.append('}');
      }
  
      protected void appendArray(float[] array) {
          buffer.append('{');
          for (int i = 0; i < array.length; i++) {
              if (i > 0) {
                  buffer.append(',');
              }
              buffer.append(array[i]);
          }
          buffer.append('}');
      }
  
      protected void appendArray(long[] array) {
          buffer.append('{');
          for (int i = 0; i < array.length; i++) {
              if (i > 0) {
                  buffer.append(',');
              }
              buffer.append(array[i]);
          }
          buffer.append('}');
      }
  
      protected void appendArray(byte[] array) {
          buffer.append('{');
          for (int i = 0; i < array.length; i++) {
              if (i > 0) {
                  buffer.append(',');
              }
              buffer.append(array[i]);
          }
          buffer.append('}');
      }
  
      protected void appendArray(double[] array) {
          buffer.append('{');
          for (int i = 0; i < array.length; i++) {
              if (i > 0) {
                  buffer.append(',');
              }
              buffer.append(array[i]);
          }
          buffer.append('}');
      }
  
      protected void appendArray(char[] array) {
          buffer.append('{');
          for (int i = 0; i < array.length; i++) {
              if (i > 0) {
                  buffer.append(',');
              }
              buffer.append(array[i]);
          }
          buffer.append('}');
      }
  
      protected void appendArray(boolean[] array) {
          buffer.append('{');
          for (int i = 0; i < array.length; i++) {
              if (i > 0) {
                  buffer.append(',');
              }
              buffer.append(array[i]);
          }
          buffer.append('}');
      }
  
      protected void appendArray(Object[] array) {
          buffer.append('{');
          for (int i = 0; i < array.length; i++) {
              if (i > 0) {
                  buffer.append(',');
              }
              appendDetail(array[i]);
          }
          buffer.append('}');
      }
  
      protected void appendClassName() {
          if (object != null) {
              buffer.append(object.getClass().getName());
          }
      }
  
      protected void appendIdentityHashCode() {
          if (object != null) {
              buffer.append('@');
              buffer.append(Integer.toHexString(System.identityHashCode(object)));
          }
      }
  
      /**
       * Returns a String built by the earlier invocations.
       */
      @Override
      public String toString() {
          buffer.append(']');
          return buffer.toString();
      }
  }
  