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// Protocol Buffers - Google's data interchange format
// Copyright 2013 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.nano;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;
/**
* Utility class for maps support.
*/
public final class MapUtil {
public static interface MapFactory {
<K, V> Map<K, V> forMap(Map<K, V> oldMap);
}
public static void setMapFactory(MapFactory newMapFactory) {
mapFactory = newMapFactory;
}
private static class DefaultMapFactory implements MapFactory {
public <K, V> Map<K, V> forMap(Map<K, V> oldMap) {
if (oldMap == null) {
return new HashMap<K, V>();
}
return oldMap;
}
}
private static volatile MapFactory mapFactory = new DefaultMapFactory();
/**
* Internal utilities to implement maps for generated messages.
* Do NOT use it explicitly.
*/
public static class Internal {
private static final byte[] emptyBytes = new byte[0];
private static Object primitiveDefaultValue(int type) {
switch (type) {
case InternalNano.TYPE_BOOL:
return Boolean.FALSE;
case InternalNano.TYPE_BYTES:
return emptyBytes;
case InternalNano.TYPE_STRING:
return "";
case InternalNano.TYPE_FLOAT:
return Float.valueOf(0);
case InternalNano.TYPE_DOUBLE:
return Double.valueOf(0);
case InternalNano.TYPE_ENUM:
case InternalNano.TYPE_FIXED32:
case InternalNano.TYPE_INT32:
case InternalNano.TYPE_UINT32:
case InternalNano.TYPE_SINT32:
case InternalNano.TYPE_SFIXED32:
return Integer.valueOf(0);
case InternalNano.TYPE_INT64:
case InternalNano.TYPE_UINT64:
case InternalNano.TYPE_SINT64:
case InternalNano.TYPE_FIXED64:
case InternalNano.TYPE_SFIXED64:
return Long.valueOf(0L);
case InternalNano.TYPE_MESSAGE:
case InternalNano.TYPE_GROUP:
default:
throw new IllegalArgumentException(
"Type: " + type + " is not a primitive type.");
}
}
/**
* Merges the map entry into the map field. Note this is only supposed to
* be called by generated messages.
*
* @param map the map field; may be null, in which case a map will be
* instantiated using the {@link MapUtil.MapFactory}
* @param input the input byte buffer
* @param keyType key type, as defined in InternalNano.TYPE_*
* @param valueType value type, as defined in InternalNano.TYPE_*
* @param valueClazz class of the value field if the valueType is
* TYPE_MESSAGE; otherwise the parameter is ignored and can be null.
* @param keyTag wire tag for the key
* @param valueTag wire tag for the value
* @return the map field
* @throws IOException
*/
@SuppressWarnings("unchecked")
public static final <K, V> Map<K, V> mergeEntry(
CodedInputByteBufferNano input,
Map<K, V> map,
int keyType,
int valueType,
Class<V> valueClazz,
int keyTag,
int valueTag) throws IOException {
map = mapFactory.forMap(map);
final int length = input.readRawVarint32();
final int oldLimit = input.pushLimit(length);
byte[] payload = null;
K key = null;
V value = null;
while (true) {
int tag = input.readTag();
if (tag == 0) {
break;
}
if (tag == keyTag) {
key = (K) input.readData(keyType);
} else if (tag == valueTag) {
if (valueType == InternalNano.TYPE_MESSAGE) {
payload = input.readBytes();
} else {
value = (V) input.readData(valueType);
}
} else {
if (!input.skipField(tag)) {
break;
}
}
}
input.checkLastTagWas(0);
input.popLimit(oldLimit);
if (key == null) {
key = (K) primitiveDefaultValue(keyType);
}
// Special case: merge the value when the value is a message.
if (valueType == InternalNano.TYPE_MESSAGE) {
MessageNano oldMessageValue = (MessageNano) map.get(key);
if (oldMessageValue != null) {
if (payload != null) {
MessageNano.mergeFrom(oldMessageValue, payload);
}
return map;
}
// Otherwise, create a new value message.
try {
value = valueClazz.newInstance();
} catch (InstantiationException e) {
throw new IOException(
"Unable to create value message " + valueClazz.getName()
+ " in maps.");
} catch (IllegalAccessException e) {
throw new IOException(
"Unable to create value message " + valueClazz.getName()
+ " in maps.");
}
if (payload != null) {
MessageNano.mergeFrom((MessageNano) value, payload);
}
}
if (value == null) {
value = (V) primitiveDefaultValue(valueType);
}
map.put(key, value);
return map;
}
public static <K, V> void serializeMapField(
CodedOutputByteBufferNano output,
Map<K, V> map, int number, int keyType, int valueType)
throws IOException {
for (Entry<K, V> entry: map.entrySet()) {
K key = entry.getKey();
V value = entry.getValue();
if (key == null || value == null) {
throw new IllegalStateException(
"keys and values in maps cannot be null");
}
int entrySize =
CodedOutputByteBufferNano.computeFieldSize(1, keyType, key) +
CodedOutputByteBufferNano.computeFieldSize(2, valueType, value);
output.writeTag(number, WireFormatNano.WIRETYPE_LENGTH_DELIMITED);
output.writeRawVarint32(entrySize);
output.writeField(1, keyType, key);
output.writeField(2, valueType, value);
}
}
public static <K, V> int computeMapFieldSize(
Map<K, V> map, int number, int keyType, int valueType) {
int size = 0;
int tagSize = CodedOutputByteBufferNano.computeTagSize(number);
for (Entry<K, V> entry: map.entrySet()) {
K key = entry.getKey();
V value = entry.getValue();
if (key == null || value == null) {
throw new IllegalStateException(
"keys and values in maps cannot be null");
}
int entrySize =
CodedOutputByteBufferNano.computeFieldSize(1, keyType, key) +
CodedOutputByteBufferNano.computeFieldSize(2, valueType, value);
size += tagSize + entrySize
+ CodedOutputByteBufferNano.computeRawVarint32Size(entrySize);
}
return size;
}
private Internal() {}
}
private MapUtil() {}
}
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