Remove two implementation classes that weren't generally useful:

- The cache interface has only one implementation. Drop the interface; we can add it back later if necessary.
 - The DefaultTypeAdapters class contains one member class. Just make that a top-level class.

gson/src/main/java/com/google/gson/Cache.java

@@ -1,43 +0,0 @@
-/*
- * Copyright (C) 2010 Google 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.google.gson;
-
-/**
- * Defines generic cache interface.
- *
- * @author Inderjeet Singh
- * @author Joel Leitch
- */
-interface Cache<K, V> {
-
-  /**
-   * Adds the new value object into the cache for the given key.  If the key already
-   * exists, then this method will override the value for the key.
-   *
-   * @param key the key identifier for the {@code value} object
-   * @param value the value object to store in the cache
-   */
-  void addElement(K key, V value);
-
-  /**
-   * Retrieve the cached value for the given {@code key}.
-   *
-   * @param key the key identifying the value
-   * @return the cached value for the given {@code key}
-   */
-  V getElement(K key);
-}

gson/src/main/java/com/google/gson/DefaultDateTypeAdapter.java

@@ -0,0 +1,119 @@
+/*
+ * Copyright (C) 2008 Google 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.google.gson;
+
+import java.lang.reflect.Type;
+import java.sql.Timestamp;
+import java.text.DateFormat;
+import java.text.ParseException;
+import java.text.SimpleDateFormat;
+import java.util.Date;
+import java.util.Locale;
+import java.util.TimeZone;
+
+/**
+ * This type adapter supports three subclasses of date: Date, Timestamp, and
+ * java.sql.Date.
+ *
+ * @author Inderjeet Singh
+ * @author Joel Leitch
+ */
+final class DefaultDateTypeAdapter implements JsonSerializer<Date>, JsonDeserializer<Date> {
+
+  // TODO: migrate to streaming adapter
+
+  private final DateFormat enUsFormat;
+  private final DateFormat localFormat;
+  private final DateFormat iso8601Format;
+
+  DefaultDateTypeAdapter() {
+    this(DateFormat.getDateTimeInstance(DateFormat.DEFAULT, DateFormat.DEFAULT, Locale.US),
+        DateFormat.getDateTimeInstance(DateFormat.DEFAULT, DateFormat.DEFAULT));
+  }
+
+  DefaultDateTypeAdapter(String datePattern) {
+    this(new SimpleDateFormat(datePattern, Locale.US), new SimpleDateFormat(datePattern));
+  }
+
+  DefaultDateTypeAdapter(int style) {
+    this(DateFormat.getDateInstance(style, Locale.US), DateFormat.getDateInstance(style));
+  }
+
+  public DefaultDateTypeAdapter(int dateStyle, int timeStyle) {
+    this(DateFormat.getDateTimeInstance(dateStyle, timeStyle, Locale.US),
+        DateFormat.getDateTimeInstance(dateStyle, timeStyle));
+  }
+
+  DefaultDateTypeAdapter(DateFormat enUsFormat, DateFormat localFormat) {
+    this.enUsFormat = enUsFormat;
+    this.localFormat = localFormat;
+    this.iso8601Format = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'", Locale.US);
+    this.iso8601Format.setTimeZone(TimeZone.getTimeZone("UTC"));
+  }
+
+  // These methods need to be synchronized since JDK DateFormat classes are not thread-safe
+  // See issue 162
+  public JsonElement serialize(Date src, Type typeOfSrc, JsonSerializationContext context) {
+    synchronized (localFormat) {
+      String dateFormatAsString = enUsFormat.format(src);
+      return new JsonPrimitive(dateFormatAsString);
+    }
+  }
+
+  public Date deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context)
+      throws JsonParseException {
+    if (!(json instanceof JsonPrimitive)) {
+      throw new JsonParseException("The date should be a string value");
+    }
+    Date date = deserializeToDate(json);
+    if (typeOfT == Date.class) {
+      return date;
+    } else if (typeOfT == Timestamp.class) {
+      return new Timestamp(date.getTime());
+    } else if (typeOfT == java.sql.Date.class) {
+      return new java.sql.Date(date.getTime());
+    } else {
+      throw new IllegalArgumentException(getClass() + " cannot deserialize to " + typeOfT);
+    }
+  }
+
+  private Date deserializeToDate(JsonElement json) {
+    synchronized (localFormat) {
+      try {
+        return localFormat.parse(json.getAsString());
+      } catch (ParseException ignored) {
+      }
+      try {
+        return enUsFormat.parse(json.getAsString());
+      } catch (ParseException ignored) {
+      }
+      try {
+        return iso8601Format.parse(json.getAsString());
+      } catch (ParseException e) {
+        throw new JsonSyntaxException(json.getAsString(), e);
+      }
+    }
+  }
+
+  @Override
+  public String toString() {
+    StringBuilder sb = new StringBuilder();
+    sb.append(DefaultDateTypeAdapter.class.getSimpleName());
+    sb.append('(').append(localFormat.getClass().getSimpleName()).append(')');
+    return sb.toString();
+  }
+}

gson/src/main/java/com/google/gson/DefaultTypeAdapters.java

@@ -1,122 +0,0 @@
-/*
- * Copyright (C) 2008 Google 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.google.gson;
-
-import java.lang.reflect.Type;
-import java.sql.Timestamp;
-import java.text.DateFormat;
-import java.text.ParseException;
-import java.text.SimpleDateFormat;
-import java.util.Date;
-import java.util.Locale;
-import java.util.TimeZone;
-
-/**
- * List of all the default type adapters ({@link JsonSerializer}s, {@link JsonDeserializer}s,
- * and {@link InstanceCreator}s.
- *
- * @author Inderjeet Singh
- * @author Joel Leitch
- */
-final class DefaultTypeAdapters {
-  /**
-   * This type adapter supports three subclasses of date: Date, Timestamp, and
-   * java.sql.Date.
-   */
-  static final class DefaultDateTypeAdapter implements JsonSerializer<Date>, JsonDeserializer<Date> {
-    private final DateFormat enUsFormat;
-    private final DateFormat localFormat;
-    private final DateFormat iso8601Format;
-
-    DefaultDateTypeAdapter() {
-      this(DateFormat.getDateTimeInstance(DateFormat.DEFAULT, DateFormat.DEFAULT, Locale.US),
-          DateFormat.getDateTimeInstance(DateFormat.DEFAULT, DateFormat.DEFAULT));
-    }
-
-    DefaultDateTypeAdapter(String datePattern) {
-      this(new SimpleDateFormat(datePattern, Locale.US), new SimpleDateFormat(datePattern));
-    }
-
-    DefaultDateTypeAdapter(int style) {
-      this(DateFormat.getDateInstance(style, Locale.US), DateFormat.getDateInstance(style));
-    }
-
-    public DefaultDateTypeAdapter(int dateStyle, int timeStyle) {
-      this(DateFormat.getDateTimeInstance(dateStyle, timeStyle, Locale.US),
-          DateFormat.getDateTimeInstance(dateStyle, timeStyle));
-    }
-
-    DefaultDateTypeAdapter(DateFormat enUsFormat, DateFormat localFormat) {
-      this.enUsFormat = enUsFormat;
-      this.localFormat = localFormat;
-      this.iso8601Format = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'", Locale.US);
-      this.iso8601Format.setTimeZone(TimeZone.getTimeZone("UTC"));
-    }
-
-    // These methods need to be synchronized since JDK DateFormat classes are not thread-safe
-    // See issue 162
-    public JsonElement serialize(Date src, Type typeOfSrc, JsonSerializationContext context) {
-      synchronized (localFormat) {
-        String dateFormatAsString = enUsFormat.format(src);
-        return new JsonPrimitive(dateFormatAsString);
-      }
-    }
-
-    public Date deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context)
-        throws JsonParseException {
-      if (!(json instanceof JsonPrimitive)) {
-        throw new JsonParseException("The date should be a string value");
-      }
-      Date date = deserializeToDate(json);
-      if (typeOfT == Date.class) {
-        return date;
-      } else if (typeOfT == Timestamp.class) {
-        return new Timestamp(date.getTime());
-      } else if (typeOfT == java.sql.Date.class) {
-        return new java.sql.Date(date.getTime());
-      } else {
-        throw new IllegalArgumentException(getClass() + " cannot deserialize to " + typeOfT);
-      }
-    }
-
-    private Date deserializeToDate(JsonElement json) {
-      synchronized (localFormat) {
-        try {
-          return localFormat.parse(json.getAsString());
-        } catch (ParseException ignored) {
-        }
-        try {
-          return enUsFormat.parse(json.getAsString());
-        } catch (ParseException ignored) {
-        }
-        try {
-          return iso8601Format.parse(json.getAsString());
-        } catch (ParseException e) {
-          throw new JsonSyntaxException(json.getAsString(), e);
-        }
-      }
-    }
-
-    @Override
-    public String toString() {
-      StringBuilder sb = new StringBuilder();
-      sb.append(DefaultDateTypeAdapter.class.getSimpleName());
-      sb.append('(').append(localFormat.getClass().getSimpleName()).append(')');
-      return sb.toString();
-    }
-  }
-}

gson/src/main/java/com/google/gson/FieldAttributes.java

@@ -16,7 +16,6 @@
 
 package com.google.gson;
 
-import com.google.gson.internal.$Gson$Preconditions;
 import com.google.gson.internal.Pair;
 import java.lang.annotation.Annotation;
 import java.lang.reflect.Field;
@@ -39,8 +38,8 @@ public final class FieldAttributes {
   private static final String MAX_CACHE_PROPERTY_NAME =
       "com.google.gson.annotation_cache_size_hint";
 
-  private static final Cache<Pair<Class<?>, String>, Collection<Annotation>> ANNOTATION_CACHE =
-      new LruCache<Pair<Class<?>,String>, Collection<Annotation>>(getMaxCacheSize());
+  private static final LruCache<Pair<Class<?>, String>, Collection<Annotation>> ANNOTATION_CACHE
+      = new LruCache<Pair<Class<?>,String>, Collection<Annotation>>(getMaxCacheSize());
 
   private final Class<?> declaringClazz;
   private final Field field;
@@ -155,11 +154,11 @@ public final class FieldAttributes {
   public Collection<Annotation> getAnnotations() {
     if (annotations == null) {
       Pair<Class<?>, String> key = new Pair<Class<?>, String>(declaringClazz, name);
-      Collection<Annotation> cachedValue = ANNOTATION_CACHE.getElement(key);
+      Collection<Annotation> cachedValue = ANNOTATION_CACHE.get(key);
       if (cachedValue == null) {
         cachedValue = Collections.unmodifiableCollection(
             Arrays.asList(field.getAnnotations()));
-        ANNOTATION_CACHE.addElement(key, cachedValue);
+        ANNOTATION_CACHE.put(key, cachedValue);
       }
       annotations = cachedValue;
     }

gson/src/main/java/com/google/gson/GsonBuilder.java

@@ -16,7 +16,6 @@
 
 package com.google.gson;
 
-import com.google.gson.DefaultTypeAdapters.DefaultDateTypeAdapter;
 import com.google.gson.annotations.Expose;
 import com.google.gson.internal.$Gson$Preconditions;
 import com.google.gson.internal.Primitives;

gson/src/main/java/com/google/gson/LruCache.java

@@ -21,16 +21,14 @@ import java.util.LinkedHashMap;
 import java.util.Map;
 
 /**
- * An implementation of the {@link Cache} interface that evict objects from the cache using an
- * LRU (least recently used) algorithm.  Object start getting evicted from the cache once the
- * {@code maxCapacity} is reached.
+ * A cache that evict objects from the cache using an LRU (least recently used)
+ * policy.  Object start getting evicted from the cache once the {@code maxCapacity}
+ * is reached.
  *
  * @author Inderjeet Singh
  * @author Joel Leitch
  */
-final class LruCache<K, V> extends LinkedHashMap<K, V> implements Cache<K, V> {
-  private static final long serialVersionUID = 1L;
-
+final class LruCache<K, V> extends LinkedHashMap<K, V> {
   private final int maxCapacity;
 
   public LruCache(int maxCapacity) {
@@ -38,16 +36,7 @@ final class LruCache<K, V> extends LinkedHashMap<K, V> implements Cache<K, V> {
     this.maxCapacity = maxCapacity;
   }
 
-  public synchronized void addElement(K key, V value) {
-    put(key, value);
-  }
-
-  public synchronized V getElement(K key) {
-    return get(key);
-  }
-
-  @Override
-  protected boolean removeEldestEntry(Map.Entry<K, V> entry) {
+  @Override protected boolean removeEldestEntry(Map.Entry<K, V> entry) {
     return size() > maxCapacity;
   }
 }

gson/src/test/java/com/google/gson/DefaultDateTypeAdapterTest.java

@@ -16,7 +16,6 @@
 
 package com.google.gson;
 
-import com.google.gson.DefaultTypeAdapters.DefaultDateTypeAdapter;
 import java.text.DateFormat;
 import java.text.SimpleDateFormat;
 import java.util.Date;

gson/src/test/java/com/google/gson/JsonDeserializerExceptionWrapperTest.java

@@ -16,8 +16,6 @@
 
 package com.google.gson;
 
-import com.google.gson.DefaultTypeAdapters.DefaultDateTypeAdapter;
-
 import junit.framework.TestCase;
 
 import java.lang.reflect.Type;