Pull new version of protobuf sources.

third_party/protobuf/java/src/main/java/com/google/protobuf/MapFieldLite.java

Index: third_party/protobuf/java/src/main/java/com/google/protobuf/MapFieldLite.java
diff --git a/third_party/protobuf/java/src/main/java/com/google/protobuf/MapFieldLite.java b/third_party/protobuf/java/src/main/java/com/google/protobuf/MapFieldLite.java
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index 0000000000000000000000000000000000000000..c17fa7b1dbf17ca0fd16922d2bda36187ade6d87
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+++ b/third_party/protobuf/java/src/main/java/com/google/protobuf/MapFieldLite.java
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+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+package com.google.protobuf;
+
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.Iterator;
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.Set;
+
+/**
+ * Internal representation of map fields in generated lite-runtime messages.
+ * 
+ * This class is a protobuf implementation detail. Users shouldn't use this
+ * class directly.
+ */
+public class MapFieldLite<K, V> implements MutabilityOracle {
+  private MutatabilityAwareMap<K, V> mapData;
+  private boolean isMutable;
+  
+  private MapFieldLite(Map<K, V> mapData) {
+    this.mapData = new MutatabilityAwareMap<K, V>(this, mapData);
+    this.isMutable = true;
+  }
+  
+  @SuppressWarnings({"rawtypes", "unchecked"})
+  private static final MapFieldLite EMPTY_MAP_FIELD =
+      new MapFieldLite(Collections.emptyMap());
+  static {
+    EMPTY_MAP_FIELD.makeImmutable();
+  }
+  
+  /** Returns an singleton immutable empty MapFieldLite instance. */
+  @SuppressWarnings({"unchecked", "cast"})
+  public static <K, V> MapFieldLite<K, V> emptyMapField() {
+    return (MapFieldLite<K, V>) EMPTY_MAP_FIELD;
+  }
+  
+  /** Creates a new MapFieldLite instance. */
+  public static <K, V> MapFieldLite<K, V> newMapField() {
+    return new MapFieldLite<K, V>(new LinkedHashMap<K, V>());
+  }
+  
+  /** Gets the content of this MapField as a read-only Map. */
+  public Map<K, V> getMap() {
+    return Collections.unmodifiableMap(mapData);
+  }
+  
+  /** Gets a mutable Map view of this MapField. */
+  public Map<K, V> getMutableMap() {
+    return mapData;
+  }
+  
+  public void mergeFrom(MapFieldLite<K, V> other) {
+    mapData.putAll(copy(other.mapData));
+  }
+  
+  public void clear() {
+    mapData.clear();
+  }
+  
+  private static boolean equals(Object a, Object b) {
+    if (a instanceof byte[] && b instanceof byte[]) {
+      return Arrays.equals((byte[]) a, (byte[]) b);
+    }
+    return a.equals(b);
+  }
+  
+  /**
+   * Checks whether two {@link Map}s are equal. We don't use the default equals
+   * method of {@link Map} because it compares by identity not by content for
+   * byte arrays.
+   */
+  static <K, V> boolean equals(Map<K, V> a, Map<K, V> b) {
+    if (a == b) {
+      return true;
+    }
+    if (a.size() != b.size()) {
+      return false;
+    }
+    for (Map.Entry<K, V> entry : a.entrySet()) {
+      if (!b.containsKey(entry.getKey())) {
+        return false;
+      }
+      if (!equals(entry.getValue(), b.get(entry.getKey()))) {
+        return false;
+      }
+    }
+    return true;
+  }
+  
+  /**
+   * Checks whether two map fields are equal.
+   */
+  @SuppressWarnings("unchecked")
+  @Override
+  public boolean equals(Object object) {
+    if (!(object instanceof MapFieldLite)) {
+      return false;
+    }
+    MapFieldLite<K, V> other = (MapFieldLite<K, V>) object;
+    return equals(mapData, other.mapData);
+  }
+  
+  private static int calculateHashCodeForObject(Object a) {
+    if (a instanceof byte[]) {
+      return LiteralByteString.hashCode((byte[]) a);
+    }
+    if (a instanceof Internal.EnumLite) {
+      return Internal.hashEnum((Internal.EnumLite) a);
+    }
+    return a.hashCode();
+  }
+
+  /**
+   * Calculates the hash code for a {@link Map}. We don't use the default hash
+   * code method of {@link Map} because for byte arrays and protobuf enums it
+   * use {@link Object#hashCode()}.
+   */
+  static <K, V> int calculateHashCodeForMap(Map<K, V> a) {
+    int result = 0;
+    for (Map.Entry<K, V> entry : a.entrySet()) {
+      result += calculateHashCodeForObject(entry.getKey())
+          ^ calculateHashCodeForObject(entry.getValue());
+    }
+    return result;    
+  }
+  
+  @Override
+  public int hashCode() {
+    return calculateHashCodeForMap(mapData);
+  }
+  
+  private static Object copy(Object object) {
+    if (object instanceof byte[]) {
+      byte[] data = (byte[]) object;
+      return Arrays.copyOf(data, data.length);
+    }
+    return object;
+  }
+  
+  /**
+   * Makes a deep copy of a {@link Map}. Immutable objects in the map will be
+   * shared (e.g., integers, strings, immutable messages) and mutable ones will
+   * have a copy (e.g., byte arrays, mutable messages).
+   */
+  @SuppressWarnings("unchecked")
+  static <K, V> Map<K, V> copy(Map<K, V> map) {
+    Map<K, V> result = new LinkedHashMap<K, V>();
+    for (Map.Entry<K, V> entry : map.entrySet()) {
+      result.put(entry.getKey(), (V) copy(entry.getValue()));
+    }
+    return result;
+  }
+  
+  /** Returns a deep copy of this map field. */
+  public MapFieldLite<K, V> copy() {
+    return new MapFieldLite<K, V>(copy(mapData));
+  }
+  
+  /**
+   * Makes this field immutable. All subsequent modifications will throw an
+   * {@link UnsupportedOperationException}.
+   */
+  public void makeImmutable() {
+    isMutable = false;
+  }
+  
+  /**
+   * Returns whether this field can be modified.
+   */
+  public boolean isMutable() {
+    return isMutable;
+  }
+  
+  @Override
+  public void ensureMutable() {
+    if (!isMutable()) {
+      throw new UnsupportedOperationException();
+    }
+  }
+
+  /**
+   * An internal map that checks for mutability before delegating.
+   */
+  static class MutatabilityAwareMap<K, V> implements Map<K, V> {    
+    private final MutabilityOracle mutabilityOracle;
+    private final Map<K, V> delegate;
+    
+    MutatabilityAwareMap(MutabilityOracle mutabilityOracle, Map<K, V> delegate) {
+      this.mutabilityOracle = mutabilityOracle;
+      this.delegate = delegate;
+    }
+
+    @Override
+    public int size() {
+      return delegate.size();
+    }
+
+    @Override
+    public boolean isEmpty() {
+      return delegate.isEmpty();
+    }
+
+    @Override
+    public boolean containsKey(Object key) {
+      return delegate.containsKey(key);
+    }
+
+    @Override
+    public boolean containsValue(Object value) {
+      return delegate.containsValue(value);
+    }
+
+    @Override
+    public V get(Object key) {
+      return delegate.get(key);
+    }
+
+    @Override
+    public V put(K key, V value) {
+      mutabilityOracle.ensureMutable();
+      return delegate.put(key, value);
+    }
+
+    @Override
+    public V remove(Object key) {
+      mutabilityOracle.ensureMutable();
+      return delegate.remove(key);
+    }
+
+    @Override
+    public void putAll(Map<? extends K, ? extends V> m) {
+      mutabilityOracle.ensureMutable();
+      delegate.putAll(m);
+    }
+
+    @Override
+    public void clear() {
+      mutabilityOracle.ensureMutable();
+      delegate.clear();
+    }
+
+    @Override
+    public Set<K> keySet() {
+      return new MutatabilityAwareSet<K>(mutabilityOracle, delegate.keySet());
+    }
+
+    @Override
+    public Collection<V> values() {
+      return new MutatabilityAwareCollection<V>(mutabilityOracle, delegate.values());
+    }
+
+    @Override
+    public Set<java.util.Map.Entry<K, V>> entrySet() {
+      return new MutatabilityAwareSet<Entry<K, V>>(mutabilityOracle, delegate.entrySet());
+    }
+
+    @Override
+    public boolean equals(Object o) {
+      return delegate.equals(o);
+    }
+
+    @Override
+    public int hashCode() {
+      return delegate.hashCode();
+    }
+
+    @Override
+    public String toString() {
+      return delegate.toString();
+    }
+  }
+
+  /**
+   * An internal collection that checks for mutability before delegating.
+   */
+  private static class MutatabilityAwareCollection<E> implements Collection<E> {
+    private final MutabilityOracle mutabilityOracle;
+    private final Collection<E> delegate;
+    
+    MutatabilityAwareCollection(MutabilityOracle mutabilityOracle, Collection<E> delegate) {
+      this.mutabilityOracle = mutabilityOracle;
+      this.delegate = delegate;
+    }
+
+    @Override
+    public int size() {
+      return delegate.size();
+    }
+
+    @Override
+    public boolean isEmpty() {
+      return delegate.isEmpty();
+    }
+
+    @Override
+    public boolean contains(Object o) {
+      return delegate.contains(o);
+    }
+
+    @Override
+    public Iterator<E> iterator() {
+      return new MutatabilityAwareIterator<E>(mutabilityOracle, delegate.iterator());
+    }
+
+    @Override
+    public Object[] toArray() {
+      return delegate.toArray();
+    }
+
+    @Override
+    public <T> T[] toArray(T[] a) {
+      return delegate.toArray(a);
+    }
+
+    @Override
+    public boolean add(E e) {
+      // Unsupported operation in the delegate.
+      throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public boolean remove(Object o) {
+      mutabilityOracle.ensureMutable();
+      return delegate.remove(o);
+    }
+
+    @Override
+    public boolean containsAll(Collection<?> c) {
+      return delegate.containsAll(c);
+    }
+
+    @Override
+    public boolean addAll(Collection<? extends E> c) {
+      // Unsupported operation in the delegate.
+      throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public boolean removeAll(Collection<?> c) {
+      mutabilityOracle.ensureMutable();
+      return delegate.removeAll(c);
+    }
+
+    @Override
+    public boolean retainAll(Collection<?> c) {
+      mutabilityOracle.ensureMutable();
+      return delegate.retainAll(c);
+    }
+
+    @Override
+    public void clear() {
+      mutabilityOracle.ensureMutable();
+      delegate.clear();
+    }
+
+    @Override
+    public boolean equals(Object o) {
+      return delegate.equals(o);
+    }
+
+    @Override
+    public int hashCode() {
+      return delegate.hashCode();
+    }
+    
+    @Override
+    public String toString() {
+      return delegate.toString();
+    }
+  }
+
+  /**
+   * An internal set that checks for mutability before delegating.
+   */
+  private static class MutatabilityAwareSet<E> implements Set<E> {
+    private final MutabilityOracle mutabilityOracle;
+    private final Set<E> delegate;
+    
+    MutatabilityAwareSet(MutabilityOracle mutabilityOracle, Set<E> delegate) {
+      this.mutabilityOracle = mutabilityOracle;
+      this.delegate = delegate;
+    }
+
+    @Override
+    public int size() {
+      return delegate.size();
+    }
+
+    @Override
+    public boolean isEmpty() {
+      return delegate.isEmpty();
+    }
+
+    @Override
+    public boolean contains(Object o) {
+      return delegate.contains(o);
+    }
+
+    @Override
+    public Iterator<E> iterator() {
+      return new MutatabilityAwareIterator<E>(mutabilityOracle, delegate.iterator());
+    }
+
+    @Override
+    public Object[] toArray() {
+      return delegate.toArray();
+    }
+
+    @Override
+    public <T> T[] toArray(T[] a) {
+      return delegate.toArray(a);
+    }
+
+    @Override
+    public boolean add(E e) {
+      mutabilityOracle.ensureMutable();
+      return delegate.add(e);
+    }
+
+    @Override
+    public boolean remove(Object o) {
+      mutabilityOracle.ensureMutable();
+      return delegate.remove(o);
+    }
+
+    @Override
+    public boolean containsAll(Collection<?> c) {
+      return delegate.containsAll(c);
+    }
+
+    @Override
+    public boolean addAll(Collection<? extends E> c) {
+      mutabilityOracle.ensureMutable();
+      return delegate.addAll(c);
+    }
+
+    @Override
+    public boolean retainAll(Collection<?> c) {
+      mutabilityOracle.ensureMutable();
+      return delegate.retainAll(c);
+    }
+
+    @Override
+    public boolean removeAll(Collection<?> c) {
+      mutabilityOracle.ensureMutable();
+      return delegate.removeAll(c);
+    }
+
+    @Override
+    public void clear() {
+      mutabilityOracle.ensureMutable();
+      delegate.clear();
+    }
+
+    @Override
+    public boolean equals(Object o) {
+      return delegate.equals(o);
+    }
+
+    @Override
+    public int hashCode() {
+      return delegate.hashCode();
+    }
+
+    @Override
+    public String toString() {
+      return delegate.toString();
+    }
+  }
+  
+  /**
+   * An internal iterator that checks for mutability before delegating.
+   */
+  private static class MutatabilityAwareIterator<E> implements Iterator<E> {
+    private final MutabilityOracle mutabilityOracle;
+    private final Iterator<E> delegate;
+    
+    MutatabilityAwareIterator(MutabilityOracle mutabilityOracle, Iterator<E> delegate) {
+      this.mutabilityOracle = mutabilityOracle;
+      this.delegate = delegate;
+    }
+
+    @Override
+    public boolean hasNext() {
+      return delegate.hasNext();
+    }
+
+    @Override
+    public E next() {
+      return delegate.next();
+    }
+
+    @Override
+    public void remove() {
+      mutabilityOracle.ensureMutable();
+      delegate.remove();
+    }
+    
+    @Override
+    public boolean equals(Object obj) {
+      return delegate.equals(obj);
+    }
+    
+    @Override
+    public int hashCode() {
+      return delegate.hashCode();
+    }
+
+    @Override
+    public String toString() {
+      return delegate.toString();
+    }
+  }
+}