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/*
* Copyright (C) 2013 Square, Inc.
*
* 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.squareup.picasso;
import android.graphics.Bitmap;
/**
* A memory cache for storing the most recently used images.
* <p/>
* <em>Note:</em> The {@link Cache} is accessed by multiple threads. You must ensure
* your {@link Cache} implementation is thread safe when {@link Cache#get(String)} or {@link
* Cache#set(String, android.graphics.Bitmap)} is called.
*/
public interface Cache {
/** Retrieve an image for the specified {@code key} or {@code null}. */
Bitmap get(String key);
/** Store an image in the cache for the specified {@code key}. */
void set(String key, Bitmap bitmap);
/** Returns the current size of the cache in bytes. */
int size();
/** Returns the maximum size in bytes that the cache can hold. */
int maxSize();
/** Clears the cache. */
void clear();
/** A cache which does not store any values. */
Cache NONE = new Cache() {
@Override public Bitmap get(String key) {
return null;
}
@Override public void set(String key, Bitmap bitmap) {
// Ignore.
}
@Override public int size() {
return 0;
}
@Override public int maxSize() {
return 0;
}
@Override public void clear() {
}
};
}
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