| /* |
| * Copyright (c) 2008, Michael Hunger. All Rights Reserved. |
| * |
| * Licensed 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.zest.api.property; |
| |
| import java.lang.reflect.ParameterizedType; |
| import java.lang.reflect.Type; |
| import java.util.ArrayList; |
| import java.util.Collection; |
| import java.util.HashMap; |
| import java.util.HashSet; |
| import java.util.LinkedHashMap; |
| import java.util.Map; |
| import java.util.Set; |
| |
| /** |
| * Default values for various property types |
| */ |
| public final class DefaultValues |
| { |
| private static final Map<Type, Object> DEFAULT_VALUES = new HashMap<Type, Object>(); |
| |
| static |
| { |
| DEFAULT_VALUES.put( Byte.class, 0 ); |
| DEFAULT_VALUES.put( Short.class, 0 ); |
| DEFAULT_VALUES.put( Character.class, 0 ); |
| DEFAULT_VALUES.put( Integer.class, 0 ); |
| DEFAULT_VALUES.put( Long.class, 0L ); |
| DEFAULT_VALUES.put( Double.class, 0D ); |
| DEFAULT_VALUES.put( Float.class, 0F ); |
| DEFAULT_VALUES.put( Boolean.class, false ); |
| DEFAULT_VALUES.put( String.class, "" ); |
| } |
| |
| public static Object getDefaultValueOf( Type type ) |
| { |
| Object value = DEFAULT_VALUES.get( type ); |
| if( value != null ) |
| { |
| return value; |
| } |
| if( type instanceof ParameterizedType ) |
| { |
| // List<Foo> -> List |
| type = ( (ParameterizedType) type ).getRawType(); |
| } |
| |
| if( type instanceof Class ) |
| { |
| Class typeAsClass = (Class) type; |
| if( Set.class.isAssignableFrom( typeAsClass ) ) |
| { |
| return new HashSet(); |
| } |
| else if( Map.class.isAssignableFrom( typeAsClass ) ) |
| { |
| return new LinkedHashMap(); |
| } |
| else if( Collection.class.isAssignableFrom( typeAsClass ) ) |
| { |
| return new ArrayList(); |
| } |
| else if( typeAsClass.isEnum() ) |
| { |
| return ( (Class) type ).getEnumConstants()[ 0 ]; |
| } |
| } |
| throw new IllegalArgumentException( "Cannot use @UseDefaults with type " + type.toString() ); |
| } |
| } |