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 018import org.apache.juneau.collections.*; 019 020/** 021 * Subclass of {@link OMap} that avoids adding common default values. 022 */ 023public class DefaultFilteringOMap extends OMap { 024 025 private static final long serialVersionUID = 1L; 026 027 /** 028 * Constructor. 029 * 030 * @param m 031 * The object map to copy from. 032 * <br>Can be <jk>null</jk>. 033 */ 034 public DefaultFilteringOMap(OMap m) { 035 super(); 036 appendAll(m); 037 } 038 039 /** 040 * Constructor. 041 */ 042 public DefaultFilteringOMap() { 043 super(); 044 } 045 046 @Override /* OMap */ 047 public OMap append(String key, Object value) { 048 if (! shouldSkip(value)) 049 super.append(key, value); 050 return this; 051 } 052 053 @Override /* OMap */ 054 public OMap a(String key, Object value) { 055 if (! shouldSkip(value)) 056 super.a(key, value); 057 return this; 058 } 059 060 /** 061 * Returns <jk>true</jk> if the specified value should be skipped. 062 * 063 * @param value The value to check. 064 * @return <jk>true</jk> if the specified value should be skipped. 065 */ 066 protected boolean shouldSkip(Object value) { 067 return 068 value == null 069 || (value instanceof Boolean && value.equals(false)) 070 || (value instanceof Number && ((Number)value).intValue() == -1) 071 || (value.getClass().isArray() && Array.getLength(value) == 0) 072 || (value instanceof Map && ((Map<?,?>)value).isEmpty()) 073 || (value instanceof Collection && ((Collection<?>)value).isEmpty()); 074 075 } 076}