/*
* 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.Map;
import org.jboss.weld.util.collections.ImmutableMap;
/**
*
* @author Martin Kouba
*/
public final class Defaults {
private static final Map<Class<?>, Object> JLS_PRIMITIVE_DEFAULT_VALUES;
private Defaults() {
}
static {
ImmutableMap.Builder<Class<?>, Object> builder = ImmutableMap.builder();
builder.put(boolean.class, false);
builder.put(char.class, '\u0000');
builder.put(byte.class, (byte) 0);
builder.put(short.class, (short) 0);
builder.put(int.class, 0);
builder.put(long.class, 0L);
builder.put(float.class, 0f);
builder.put(double.class, 0d);
JLS_PRIMITIVE_DEFAULT_VALUES = builder.build();
}
/**
* 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> T getJlsDefaultValue(Class<T> type) {
if(!type.isPrimitive()) {
return null;
}
return (T) JLS_PRIMITIVE_DEFAULT_VALUES.get(type);
}
}