1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one or more 3 * contributor license agreements. See the NOTICE file distributed with 4 * this work for additional information regarding copyright ownership. 5 * The ASF licenses this file to You under the Apache License, Version 2.0 6 * (the "License"); you may not use this file except in compliance with 7 * the License. You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 */ 17 package org.apache.commons.pool2; 18 19 /** 20 * A base class for common functionality. 21 * 22 * @since 2.4.3 23 */ 24 public abstract class BaseObject { 25 26 @Override 27 public String toString() { 28 final StringBuilder builder = new StringBuilder(); 29 builder.append(getClass().getSimpleName()); 30 builder.append(" ["); 31 toStringAppendFields(builder); 32 builder.append("]"); 33 return builder.toString(); 34 } 35 36 /** 37 * Used by sub-classes to include the fields defined by the sub-class in the 38 * {@link #toString()} output. 39 * 40 * @param builder Field names and values are appended to this object 41 */ 42 protected void toStringAppendFields(final StringBuilder builder) { 43 // do nothing by default, needed for b/w compatibility. 44 } 45 }