Add a new method, LruCache.remove (56b6ad3e) · Commits · e / os / android_frameworks_base

api/current.xml

+14 −1

Original line number	Original line	Diff line number	Diff line
	@@ -206346,6 +206346,19 @@
	visibility="public"		visibility="public"
	>		>
	</method>		</method>
			<method name="remove"
			return="V"
			abstract="false"
			native="false"
			synchronized="true"
			static="false"
			final="true"
			deprecated="not deprecated"
			visibility="public"
			>
			<parameter name="key" type="K">
			</parameter>
			</method>
	<method name="size"		<method name="size"
	return="int"		return="int"
	abstract="false"		abstract="false"
	@@ -265592,7 +265605,7 @@
	deprecated="not deprecated"		deprecated="not deprecated"
	visibility="public"		visibility="public"
	>		>
	<parameter name="t" type="T">		<parameter name="arg0" type="T">
	</parameter>		</parameter>
	</method>		</method>
	</interface>		</interface>

core/java/android/util/LruCache.java

+25 −3

Original line number	Original line	Diff line number	Diff line
	@@ -51,6 +51,10 @@ import java.util.Map;
	* cache.put(key, value);		* cache.put(key, value);
	* }		* }
	* }}</pre>		* }}</pre>
			*
			* <p>This class does not allow null to be used as a key or value. A return
			* value of null from {@link #get}, {@link #put} or {@link #remove} is
			* unambiguous: the key was not in the cache.
	*/		*/
	public class LruCache<K, V> {		public class LruCache<K, V> {
	private final LinkedHashMap<K, V> map;		private final LinkedHashMap<K, V> map;
	@@ -86,7 +90,7 @@ public class LruCache<K, V> {
	*/		*/
	public synchronized final V get(K key) {		public synchronized final V get(K key) {
	if (key == null) {		if (key == null) {
	throw new NullPointerException();		throw new NullPointerException("key == null");
	}		}

	V result = map.get(key);		V result = map.get(key);
	@@ -118,7 +122,7 @@ public class LruCache<K, V> {
	*/		*/
	public synchronized final V put(K key, V value) {		public synchronized final V put(K key, V value) {
	if (key == null \|\| value == null) {		if (key == null \|\| value == null) {
	throw new NullPointerException();		throw new NullPointerException("key == null \|\| value == null");
	}		}

	putCount++;		putCount++;
	@@ -133,7 +137,7 @@ public class LruCache<K, V> {

	private void trimToSize(int maxSize) {		private void trimToSize(int maxSize) {
	while (size > maxSize) {		while (size > maxSize) {
	Map.Entry<K, V> toEvict = map.eldest();		Map.Entry<K, V> toEvict = map.eldest(); // equal to map.entrySet().iterator().next();
	if (toEvict == null) {		if (toEvict == null) {
	break; // map is empty; if size is not 0 then throw an error below		break; // map is empty; if size is not 0 then throw an error below
	}		}
	@@ -154,6 +158,24 @@ public class LruCache<K, V> {
	}		}
	}		}

			/**
			* Removes the entry for {@code key} if it exists.
			*
			* @return the previous value mapped by {@code key}. Although that entry is
			* no longer cached, it has not been passed to {@link #entryEvicted}.
			*/
			public synchronized final V remove(K key) {
			if (key == null) {
			throw new NullPointerException("key == null");
			}

			V previous = map.remove(key);
			if (previous != null) {
			size -= safeSizeOf(key, previous);
			}
			return previous;
			}

	/**		/**
	* Called for entries that have reached the tail of the least recently used		* Called for entries that have reached the tail of the least recently used
	* queue and are be removed. The default implementation does nothing.		* queue and are be removed. The default implementation does nothing.

core/tests/coretests/src/android/util/LruCacheTest.java

+39 −0

Original line number	Original line	Diff line number	Diff line
	@@ -337,6 +337,45 @@ public final class LruCacheTest extends TestCase {
	assertSnapshot(cache);		assertSnapshot(cache);
	}		}

			public void testRemoveDoesNotCallEntryEvicted() {
			LruCache<String, String> cache = new LruCache<String, String>(10) {
			@Override protected void entryEvicted(String key, String value) {
			fail();
			}
			};
			cache.put("a", "A");
			assertEquals("A", cache.remove("a"));
			}

			public void testRemoveWithCustomSizes() {
			LruCache<String, String> cache = new LruCache<String, String>(10) {
			@Override protected int sizeOf(String key, String value) {
			return value.length();
			}
			};
			cache.put("a", "123456");
			cache.put("b", "1234");
			cache.remove("a");
			assertEquals(4, cache.size());
			}

			public void testRemoveAbsentElement() {
			LruCache<String, String> cache = new LruCache<String, String>(10);
			cache.put("a", "A");
			cache.put("b", "B");
			assertEquals(null, cache.remove("c"));
			assertEquals(2, cache.size());
			}

			public void testRemoveNullThrows() {
			LruCache<String, String> cache = new LruCache<String, String>(10);
			try {
			cache.remove(null);
			fail();
			} catch (NullPointerException expected) {
			}
			}

	private LruCache<String, String> newCreatingCache() {		private LruCache<String, String> newCreatingCache() {
	return new LruCache<String, String>(3) {		return new LruCache<String, String>(3) {
	@Override protected String create(String key) {		@Override protected String create(String key) {