/*
* Licensed to the Apache Software Foundation (ASF) under one or more contributor license
* agreements. See the NOTICE file distributed with this work for additional information regarding
* copyright ownership. The ASF licenses this file to You 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.geode.internal.size;
/**
* An efficient sizer for some commonly used classes.
*
* This will return 0 if it does not know how to size the object
*
*/
public class WellKnownClassSizer {
private static final int BYTE_ARRAY_OVERHEAD;
private static final int STRING_OVERHEAD;
static {
try {
ReflectionSingleObjectSizer objSizer = new ReflectionSingleObjectSizer();
BYTE_ARRAY_OVERHEAD = (int) objSizer.sizeof(new byte[0], false);
STRING_OVERHEAD = (int) (ReflectionSingleObjectSizer.sizeof(String.class)
+ objSizer.sizeof(new char[0], false));
} catch (Exception e) {
throw new ExceptionInInitializerError(e);
}
}
public static int sizeof(Object o) {
int size = 0;
if (o instanceof byte[]) {
size = BYTE_ARRAY_OVERHEAD + ((byte[]) o).length;
} else if (o instanceof String) {
size = STRING_OVERHEAD + ((String) o).length() * 2;
} else {
return 0;
}
size = (int) ReflectionSingleObjectSizer.roundUpSize(size);
return size;
}
}