package org.apache.lucene.util;
/**
* 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.
*/
import java.util.IdentityHashMap;
import java.util.Map;
/**
* An average, best guess, MemoryModel that should work okay on most systems.
*
*/
public class AverageGuessMemoryModel extends MemoryModel {
// best guess primitive sizes
private final Map<Class,Integer> sizes = new IdentityHashMap<Class,Integer>() {
{
put(boolean.class, Integer.valueOf(1));
put(byte.class, Integer.valueOf(1));
put(char.class, Integer.valueOf(2));
put(short.class, Integer.valueOf(2));
put(int.class, Integer.valueOf(4));
put(float.class, Integer.valueOf(4));
put(double.class, Integer.valueOf(8));
put(long.class, Integer.valueOf(8));
}
};
/*
* (non-Javadoc)
*
* @see org.apache.lucene.util.MemoryModel#getArraySize()
*/
@Override
public int getArraySize() {
return 16;
}
/*
* (non-Javadoc)
*
* @see org.apache.lucene.util.MemoryModel#getClassSize()
*/
@Override
public int getClassSize() {
return 8;
}
/* (non-Javadoc)
* @see org.apache.lucene.util.MemoryModel#getPrimitiveSize(java.lang.Class)
*/
@Override
public int getPrimitiveSize(Class clazz) {
return sizes.get(clazz).intValue();
}
/* (non-Javadoc)
* @see org.apache.lucene.util.MemoryModel#getReferenceSize()
*/
@Override
public int getReferenceSize() {
return 4;
}
}