diff --git a/include/utils/BasicHashtable.h b/include/utils/BasicHashtable.h
index fdf9738..7a6c96c 100644
--- a/include/utils/BasicHashtable.h
+++ b/include/utils/BasicHashtable.h
@@ -328,6 +328,14 @@
         BasicHashtableImpl::rehash(minimumCapacity, loadFactor);
     }
 
+    /* Determines whether there is room to add another entry without rehashing.
+     * When this returns true, a subsequent add() operation is guaranteed to
+     * complete without performing a rehash.
+     */
+    inline bool hasMoreRoom() const {
+        return mCapacity > mFilledBuckets;
+    }
+
 protected:
     static inline const TEntry& entryFor(const Bucket& bucket) {
         return reinterpret_cast<const TEntry&>(bucket.entry);
diff --git a/include/utils/JenkinsHash.h b/include/utils/JenkinsHash.h
new file mode 100644
index 0000000..e964e6f
--- /dev/null
+++ b/include/utils/JenkinsHash.h
@@ -0,0 +1,44 @@
+/*
+ * Copyright (C) 2012 The Android Open Source Project
+ *
+ * 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.
+ */
+
+/* Implementation of Jenkins one-at-a-time hash function. These choices are
+ * optimized for code size and portability, rather than raw speed. But speed
+ * should still be quite good.
+ **/
+
+#include <utils/TypeHelpers.h>
+
+namespace android {
+
+/* The Jenkins hash of a sequence of 32 bit words A, B, C is:
+ * Whiten(Mix(Mix(Mix(0, A), B), C)) */
+
+inline uint32_t JenkinsHashMix(uint32_t hash, uint32_t data) {
+    hash += data;
+    hash += (hash << 10);
+    hash ^= (hash >> 6);
+    return hash;
+}
+
+hash_t JenkinsHashWhiten(uint32_t hash);
+
+/* Helpful utility functions for hashing data in 32 bit chunks */
+uint32_t JenkinsHashMixBytes(uint32_t hash, const uint8_t* bytes, size_t size);
+
+uint32_t JenkinsHashMixShorts(uint32_t hash, const uint16_t* shorts, size_t size);
+
+}
+
diff --git a/include/utils/LruCache.h b/include/utils/LruCache.h
new file mode 100644
index 0000000..af39315
--- /dev/null
+++ b/include/utils/LruCache.h
@@ -0,0 +1,199 @@
+/*
+ * Copyright (C) 2012 The Android Open Source Project
+ *
+ * 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.
+ */
+
+#include <utils/BasicHashtable.h>
+#include <utils/GenerationCache.h>
+#include <utils/UniquePtr.h>
+
+namespace android {
+
+// OnEntryRemoved is defined in GenerationCache.h, but maybe should move here.
+
+template <typename TKey, typename TValue>
+class LruCache {
+public:
+    explicit LruCache(uint32_t maxCapacity);
+
+    enum Capacity {
+        kUnlimitedCapacity,
+    };
+
+    void setOnEntryRemovedListener(OnEntryRemoved<TKey, TValue>* listener);
+    size_t size() const;
+    const TValue& get(const TKey& key);
+    bool put(const TKey& key, const TValue& value);
+    bool remove(const TKey& key);
+    bool removeOldest();
+    void clear();
+
+private:
+    LruCache(const LruCache& that);  // disallow copy constructor
+
+    struct Entry {
+        TKey key;
+        TValue value;
+        Entry* parent;
+        Entry* child;
+
+        Entry(TKey key_, TValue value_) : key(key_), value(value_), parent(NULL), child(NULL) {
+        }
+        const TKey& getKey() const { return key; }
+    };
+
+    void attachToCache(Entry& entry);
+    void detachFromCache(Entry& entry);
+    void rehash(size_t newCapacity);
+
+    UniquePtr<BasicHashtable<TKey, Entry> > mTable;
+    OnEntryRemoved<TKey, TValue>* mListener;
+    Entry* mOldest;
+    Entry* mYoungest;
+    uint32_t mMaxCapacity;
+    TValue mNullValue;
+};
+
+// Implementation is here, because it's fully templated
+template <typename TKey, typename TValue>
+LruCache<TKey, TValue>::LruCache(uint32_t maxCapacity): mMaxCapacity(maxCapacity),
+    mNullValue(NULL), mTable(new BasicHashtable<TKey, Entry>), mYoungest(NULL), mOldest(NULL),
+    mListener(NULL) {
+};
+
+template<typename K, typename V>
+void LruCache<K, V>::setOnEntryRemovedListener(OnEntryRemoved<K, V>* listener) {
+    mListener = listener;
+}
+
+template <typename TKey, typename TValue>
+size_t LruCache<TKey, TValue>::size() const {
+    return mTable->size();
+}
+
+template <typename TKey, typename TValue>
+const TValue& LruCache<TKey, TValue>::get(const TKey& key) {
+    hash_t hash = hash_type(key);
+    ssize_t index = mTable->find(-1, hash, key);
+    if (index == -1) {
+        return mNullValue;
+    }
+    Entry& entry = mTable->editEntryAt(index);
+    detachFromCache(entry);
+    attachToCache(entry);
+    return entry.value;
+}
+
+template <typename TKey, typename TValue>
+bool LruCache<TKey, TValue>::put(const TKey& key, const TValue& value) {
+    if (mMaxCapacity != kUnlimitedCapacity && size() >= mMaxCapacity) {
+        removeOldest();
+    }
+
+    hash_t hash = hash_type(key);
+    ssize_t index = mTable->find(-1, hash, key);
+    if (index >= 0) {
+        return false;
+    }
+    if (!mTable->hasMoreRoom()) {
+        rehash(mTable->capacity() * 2);
+    }
+
+    // Would it be better to initialize a blank entry and assign key, value?
+    Entry initEntry(key, value);
+    index = mTable->add(hash, initEntry);
+    Entry& entry = mTable->editEntryAt(index);
+    attachToCache(entry);
+    return true;
+}
+
+template <typename TKey, typename TValue>
+bool LruCache<TKey, TValue>::remove(const TKey& key) {
+    hash_t hash = hash_type(key);
+    ssize_t index = mTable->find(-1, hash, key);
+    if (index < 0) {
+        return false;
+    }
+    Entry& entry = mTable->editEntryAt(index);
+    if (mListener) {
+        (*mListener)(entry.key, entry.value);
+    }
+    detachFromCache(entry);
+    mTable->removeAt(index);
+    return true;
+}
+
+template <typename TKey, typename TValue>
+bool LruCache<TKey, TValue>::removeOldest() {
+    if (mOldest != NULL) {
+        return remove(mOldest->key);
+        // TODO: should probably abort if false
+    }
+    return false;
+}
+
+template <typename TKey, typename TValue>
+void LruCache<TKey, TValue>::clear() {
+    if (mListener) {
+        for (Entry* p = mOldest; p != NULL; p = p->child) {
+            (*mListener)(p->key, p->value);
+        }
+    }
+    mYoungest = NULL;
+    mOldest = NULL;
+    mTable->clear();
+}
+
+template <typename TKey, typename TValue>
+void LruCache<TKey, TValue>::attachToCache(Entry& entry) {
+    if (mYoungest == NULL) {
+        mYoungest = mOldest = &entry;
+    } else {
+        entry.parent = mYoungest;
+        mYoungest->child = &entry;
+        mYoungest = &entry;
+    }
+}
+
+template <typename TKey, typename TValue>
+void LruCache<TKey, TValue>::detachFromCache(Entry& entry) {
+    if (entry.parent != NULL) {
+        entry.parent->child = entry.child;
+    } else {
+        mOldest = entry.child;
+    }
+    if (entry.child != NULL) {
+        entry.child->parent = entry.parent;
+    } else {
+        mYoungest = entry.parent;
+    }
+
+    entry.parent = NULL;
+    entry.child = NULL;
+}
+
+template <typename TKey, typename TValue>
+void LruCache<TKey, TValue>::rehash(size_t newCapacity) {
+    UniquePtr<BasicHashtable<TKey, Entry> > oldTable(mTable.release());
+    Entry* oldest = mOldest;
+
+    mOldest = NULL;
+    mYoungest = NULL;
+    mTable.reset(new BasicHashtable<TKey, Entry>(newCapacity));
+    for (Entry* p = oldest; p != NULL; p = p->child) {
+        put(p->key, p->value);
+    }
+}
+
+}
diff --git a/include/utils/TypeHelpers.h b/include/utils/TypeHelpers.h
index 2bf33c3..13c9081 100644
--- a/include/utils/TypeHelpers.h
+++ b/include/utils/TypeHelpers.h
@@ -291,7 +291,7 @@
 ANDROID_REINTERPRET_HASH(float, uint32_t)
 ANDROID_REINTERPRET_HASH(double, uint64_t)
 
-template <typename T> inline hash_t hash_type(const T*& value) {
+template <typename T> inline hash_t hash_type(T* const & value) {
     return hash_type(uintptr_t(value));
 }