org.jboss.weld.util.Defaults Maven / Gradle / Ivy
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* JBoss, Home of Professional Open Source
* Copyright 2014, Red Hat, Inc., and individual contributors
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* 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.jboss.weld.util;
import java.util.HashMap;
import java.util.Map;
import org.jboss.weld.util.collections.ImmutableMap;
/**
*
* @author Martin Kouba
*/
public final class Defaults {
private static final Map, Object> JLS_PRIMITIVE_DEFAULT_VALUES;
private Defaults() {
}
static {
Map, Object> values = new HashMap<>();
put(values, boolean.class, false);
put(values, char.class, '\u0000');
put(values, byte.class, (byte) 0);
put(values, short.class, (short) 0);
put(values, int.class, 0);
put(values, long.class, 0L);
put(values, float.class, 0f);
put(values, double.class, 0d);
JLS_PRIMITIVE_DEFAULT_VALUES = ImmutableMap., Object> builder().putAll(values).build();
}
private static void put(Map, Object> map, Class type, T value) {
map.put(type, value);
}
/**
* See also JLS8, 4.12.5 Initial Values of Variables.
*
* @param type
* @return the default value for the given type as defined by JLS
*/
@SuppressWarnings("unchecked")
public static T getJlsDefaultValue(Class type) {
if(!type.isPrimitive()) {
return null;
}
return (T) JLS_PRIMITIVE_DEFAULT_VALUES.get(type);
}
}