org.apache.fop.afp.fonts.IntegerKeyStore Maven / Gradle / Ivy
/*
* 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.
*/
/* $Id: IntegerKeyStore.java 1564017 2014-02-03 19:29:24Z vhennebert $ */
package org.apache.fop.afp.fonts;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
/**
* A simple compact data structure to model a sparse array
*/
class IntegerKeyStore {
private static final int RANGE_BIT_SIZE = 8;
private static final int RANGE_SIZE = 1 << RANGE_BIT_SIZE;
private final Map> arrays = new HashMap>();
/**
*
* @param index a positive integer
* @param value value to store
*/
public void put(Integer index, T value) {
if (index < 0) {
throw new IndexOutOfBoundsException();
}
int rangeKey = index >> RANGE_BIT_SIZE;
int rangeIndex = index % RANGE_SIZE;
ArrayList range = arrays.get(rangeKey);
if (range == null) {
range = new ArrayList(Collections.nCopies(RANGE_SIZE, null));
arrays.put(rangeKey, range);
}
range.set(rangeIndex, value);
}
/**
*
* @param index a positive integer
* @return value the value associated with the index or null
*/
public T get(Integer index) {
if (index < 0) {
throw new IndexOutOfBoundsException();
}
int rangeKey = index >> RANGE_BIT_SIZE;
int rangeIndex = index % RANGE_SIZE;
ArrayList range = arrays.get(rangeKey);
return range == null ? null : range.get(rangeIndex);
}
}