import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

mobile/android/thirdparty/com/squareup/picasso/Cache.java

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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() {
+    }
+  };
+}