001// *************************************************************************************************************************** 002// * Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file * 003// * distributed with this work for additional information regarding copyright ownership. The ASF licenses this file * 004// * to you under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance * 005// * with the License. You may obtain a copy of the License at * 006// * * 007// * http://www.apache.org/licenses/LICENSE-2.0 * 008// * * 009// * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an * 010// * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the * 011// * specific language governing permissions and limitations under the License. * 012// *************************************************************************************************************************** 013package org.apache.juneau; 014 015import java.lang.reflect.*; 016import java.util.*; 017 018/** 019 * Subclass of {@link ObjectMap} that avoids adding common default values. 020 */ 021public class DefaultFilteringObjectMap extends ObjectMap { 022 023 private static final long serialVersionUID = 1L; 024 025 /** 026 * Constructor. 027 * 028 * @param m 029 * The object map to copy from. 030 * <br>Can be <jk>null</jk>. 031 */ 032 public DefaultFilteringObjectMap(ObjectMap m) { 033 super(); 034 appendAll(m); 035 } 036 037 /** 038 * Constructor. 039 */ 040 public DefaultFilteringObjectMap() { 041 super(); 042 } 043 044 @Override /* ObjectMap */ 045 public ObjectMap append(String key, Object value) { 046 if (! shouldSkip(value)) 047 super.append(key, value); 048 return this; 049 } 050 051 /** 052 * Returns <jk>true</jk> if the specified value should be skipped. 053 * 054 * @param value The value to check. 055 * @return <jk>true</jk> if the specified value should be skipped. 056 */ 057 protected boolean shouldSkip(Object value) { 058 return 059 value == null 060 || (value instanceof Boolean && value.equals(false)) 061 || (value instanceof Number && ((Number)value).intValue() == -1) 062 || (value.getClass().isArray() && Array.getLength(value) == 0) 063 || (value instanceof Map && ((Map<?,?>)value).isEmpty()) 064 || (value instanceof Collection && ((Collection<?>)value).isEmpty()); 065 066 } 067}