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/*
* Copyright 2000-2013 Vaadin Ltd.
*
* 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 com.vaadin.data.util.sqlcontainer;
import java.util.LinkedHashMap;
import java.util.Map;
/**
* CacheMap extends LinkedHashMap, adding the possibility to adjust maximum
* number of items. In SQLContainer this is used for RowItem -cache. Cache size
* will be two times the page length parameter of the container.
*/
class CacheMap<K, V> extends LinkedHashMap<K, V> {
private static final long serialVersionUID = 679999766473555231L;
private int cacheLimit = SQLContainer.CACHE_RATIO
* SQLContainer.DEFAULT_PAGE_LENGTH;
@Override
protected boolean removeEldestEntry(Map.Entry<K, V> eldest) {
return size() > cacheLimit;
}
void setCacheLimit(int limit) {
cacheLimit = limit > 0 ? limit : SQLContainer.DEFAULT_PAGE_LENGTH;
}
int getCacheLimit() {
return cacheLimit;
}
}
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