/*******************************************************************************
|
* Copyright 2011-2014 Sergey Tarasevich
|
*
|
* 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.nostra13.universalimageloader.cache.memory;
|
|
import android.graphics.Bitmap;
|
|
import java.lang.ref.Reference;
|
import java.util.*;
|
|
/**
|
* Base memory cache. Implements common functionality for memory cache. Provides object references (
|
* {@linkplain Reference not strong}) storing.
|
*
|
* @author Sergey Tarasevich (nostra13[at]gmail[dot]com)
|
* @since 1.0.0
|
*/
|
public abstract class BaseMemoryCache implements MemoryCache {
|
|
/** Stores not strong references to objects */
|
private final Map<String, Reference<Bitmap>> softMap = Collections.synchronizedMap(new HashMap<String, Reference<Bitmap>>());
|
|
@Override
|
public Bitmap get(String key) {
|
Bitmap result = null;
|
Reference<Bitmap> reference = softMap.get(key);
|
if (reference != null) {
|
result = reference.get();
|
}
|
return result;
|
}
|
|
@Override
|
public boolean put(String key, Bitmap value) {
|
softMap.put(key, createReference(value));
|
return true;
|
}
|
|
@Override
|
public Bitmap remove(String key) {
|
Reference<Bitmap> bmpRef = softMap.remove(key);
|
return bmpRef == null ? null : bmpRef.get();
|
}
|
|
@Override
|
public Collection<String> keys() {
|
synchronized (softMap) {
|
return new HashSet<String>(softMap.keySet());
|
}
|
}
|
|
@Override
|
public void clear() {
|
softMap.clear();
|
}
|
|
/** Creates {@linkplain Reference not strong} reference of value */
|
protected abstract Reference<Bitmap> createReference(Bitmap value);
|
}
|
