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am 9aaf5076: ProtoBuf update * Added IntMap that uses Hashtable for larger keys * Chagned to use IntMap to allow larger tags * Changed to use autoboxing for int/longs.

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Merge commit '9aaf507646c866ab131bf2bcd973882ff9f553cf'

* commit '9aaf507646c866ab131bf2bcd973882ff9f553cf':
  ProtoBuf update
This commit is contained in:
Mitsuru Oshima 2009-06-10 10:30:24 -07:00 committed by The Android Open Source Project
commit 53a2e9d2b0
4 changed files with 653 additions and 171 deletions
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383
src/com/google/common/io/protocol/IntMap.java Normal file
View File

@ -0,0 +1,383 @@
// Copyright 2009 Google Inc. All Rights Reserved.
package com.google.common.io.protocol;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.NoSuchElementException;
/**
* A Map from primitive integers to Object values. This stores values
* for smaller keys in an Object array, and uses {@link Hashtable}
* only for larger keys. This is specifically designed to be used by
* J2me protocol buffer runtime ({@link ProtoBuf}, {@link ProtoBufType})
* to support large tags that are commonly used in Extensions/MessageSet.
*
* This class is not thread safe, so the client has to provide
* appropriate locking mechanism if the map is to be used from
* multiple threads.
*/
public class IntMap {
private static final int MAX_LOWER_BUFFER_SIZE = 64;
private static final int INITIAL_LOWER_BUFFER_SIZE = 8;
/**
* An iterator that returns int keys of the IntMap. IntMap has its
* own Iterator instead of Enumeration to avoid autoboxing. This
* uses the same buffer of the IntMap, so you should not update the
* IntMap while the iterator is in use. Once the IntMap is changed,
* the behavior of preiously obtained iterator is undefined, and a new
* KeyIterator has to be used instead.
*/
public class KeyIterator {
private int oneAheadIndex = 0;
private int currentKey = Integer.MIN_VALUE;
private Enumeration higherKeyEnumerator = null;
/**
* @returns true if there is more keys.
*/
public boolean hasNext() {
if (currentKey != Integer.MIN_VALUE) {
return true;
}
if (oneAheadIndex <= maxLowerKey) {
for (; oneAheadIndex <= maxLowerKey; oneAheadIndex++) {
if (lower[oneAheadIndex] != null) {
// record the key, then increment the oneAheadIndex.
currentKey = oneAheadIndex++;
return true;
}
}
}
if (higher != null) {
if (higherKeyEnumerator == null) {
higherKeyEnumerator = higher.keys();
}
if (higherKeyEnumerator.hasMoreElements()) {
Integer key = (Integer) higherKeyEnumerator.nextElement();
currentKey = key.intValue();
return true;
}
}
return false;
}
/**
* @returns next key
* @throws NoSuchElementException if there is no more keys.
*/
public int next() {
if (currentKey == Integer.MIN_VALUE && !hasNext()) {
throw new NoSuchElementException();
}
int key = currentKey;
currentKey = Integer.MIN_VALUE;
return key;
}
}
/** Stores values for lower keys */
private Object[] lower;
/** Hashtable for higher tags */
private Hashtable higher;
/** A maximum key that has been ever added to the lower buffer.*/
private int maxLowerKey;
/** A maximum key that has been ever added to the map.*/
private int maxKey;
/** the number of elements in lower buffer */
private int lowerCount;
/**
* Constructs an {@link IntMap} with default lower buffer size.
*/
public IntMap() {
this(INITIAL_LOWER_BUFFER_SIZE); // can expand 3 times
}
/**
* Constructs an {@link IntMap} with the suggested initial lower buffer size.
* The argument is just a hint and may not be used. If its value is
* larger than {@link MAX_LOWER_BUFFER_SIZE} or negative, it will use the
* MAX_LOWER_BUFFER_SIZE instead.
*/
IntMap(int initialLowerBufferSize) {
int lowerBufferSize = INITIAL_LOWER_BUFFER_SIZE;
if (initialLowerBufferSize > 0) {
lowerBufferSize = Math.min(initialLowerBufferSize, MAX_LOWER_BUFFER_SIZE);
}
lower = new Object[lowerBufferSize];
lowerCount = 0;
maxKey = Integer.MIN_VALUE;
maxLowerKey = Integer.MIN_VALUE;
}
/**
* A factory method to constructs an {@link IntMap} with the same
* lower buffer size.
*
* @return a new IntMap whose lower buffer size is same as
* this instance.
*/
public IntMap newIntMapWithSameBufferSize() {
return new IntMap(maxLowerKey);
}
/**
* @return the {@link KeyIterator} of the map.
*/
public KeyIterator keys() {
return new KeyIterator();
}
/**
* Returns max key that ever added to the map. Note that this is not
* max for current state. Removing the max key will not update the
* max key value. If nothing is added, it will return {@link
* Integer.MIN_VALUE}, which means you cannot tell if an value is
* added with MIN_VALUE key.
*/
public int maxKey() {
return maxKey;
}
/**
* Returns the number of key-value pairs in the map.
*/
public int size() {
return higher == null ? lowerCount : lowerCount + higher.size();
}
/**
* @return true if the map is empty.
*/
public boolean isEmpty() {
return size() == 0;
}
/**
* Clears all key/value pairs. The map becomes empty after this
* operation, but does not release memory.
*/
public void clear() {
for (int i = 0; i < lower.length; i++) {
lower[i] = null;
}
if (higher != null) higher.clear();
maxKey = Integer.MIN_VALUE;
maxLowerKey = Integer.MIN_VALUE;
lowerCount = 0;
}
/**
* Returns the value associated with the given key.
*
* @param key a key
* @return the value associated with the given key. null if the map has
* no value for the key.
*/
public Object get(int key) {
if (key > maxKey) {
return null;
} else if (0 <= key && key <= maxLowerKey) {
return lower[key];
} else if (higher != null) {
return higher.get(key);
} else {
return null;
}
}
/**
* Maps the specified key to the given value in the {@link IntMap}.
* Caveat: Passing null value removes the value from the map. This is to
* keep the semantics used in {@link ProtoBuf}.
*
* @param key a key
* @param value the value to be added to the Map. If this is null,
* the key will be removed from the map. This method does nothing if
* the key does not exist and value is null.
*/
public void put(int key, Object value) {
if (value == null) {
remove(key);
return;
}
expandLowerIfNecessary(key);
maxKey = Math.max(key, maxKey);
if (0 <= key && key < lower.length) {
maxLowerKey = Math.max(key, maxLowerKey);
if (lower[key] == null) {
lowerCount++;
}
lower[key] = value;
} else {
if (higher == null) {
higher = new Hashtable();
}
higher.put(key, value);
}
}
/**
* Removes the key and corresponding value from the {@link IntMap}.
*
* @param key the key to remove. This method does nothing if the map does not
* have the value corresponding for the key.
* @return the removed value. null if the map does not have the value for
* the key.
*/
public Object remove(int key) {
Object deleted = null;
if (0 <= key && key < lower.length) {
deleted = lower[key];
if (deleted != null) {
lowerCount--;
}
lower[key] = null;
} else if (higher != null) {
return higher.remove(key);
}
return deleted;
}
/**
* Tests if given key has a corresponding value in this {@link IntMap}.
*
* @param key possible key.
* @return <code>true</code> if the given key has the correspoding
* value. <code>false</code> otherwise.
*/
public boolean containsKey(int key) {
if (0 <= key && key < lower.length) {
return lower[key] != null;
} else if (higher != null) {
return higher.containsKey(key);
}
return false;
}
/**
* Returns hashcode for {@link IntMap}.
*/
public int hashCode() {
int hashCode = 1;
for (int i = 0; i < lower.length ; i++) {
Object value = lower[i];
if (value != null) {
hashCode = 31 * hashCode + value.hashCode() + i;
}
}
// Hashtable in J2me does not implement hashCode(), so we simply
// use the size of hashtable.
return higher == null ? hashCode : hashCode + higher.size();
}
/**
* Compares the equality. Two IntMaps are considered equals iff
* both map have the same key-value pairs.
* Caveat: This assumes that the Class of each value object implements
* equals correctly. This may not be the case in J2me.
*
* @param object an object to be compared with
* @return true if the specified Object is equal to this IntMap
*/
public boolean equals(Object object) {
if (this == object) {
return true;
}
if (object == null || !(object instanceof IntMap)) {
return false;
}
IntMap peer = (IntMap) object;
if (size() != peer.size()) {
return false;
}
return compareLowerBuffer(lower, peer.lower) &&
compareHashtable(higher, peer.higher);
}
private boolean compareLowerBuffer(Object[] lower1, Object[] lower2) {
int min = Math.min(lower1.length, lower2.length);
for (int i = 0; i < min; i++) {
if ((lower1[i] == null && lower2[i] != null) ||
(lower1[i] != null && !lower1[i].equals(lower2[i]))) {
return false;
}
}
// make sure there are no values in remaining fields.
if (lower1.length > lower2.length) {
for (int i = min; i < lower1.length; i++) {
if (lower1[i] != null) return false;
}
} else if (lower1.length < lower2.length) {
for (int i = min; i < lower2.length; i++) {
if (lower2[i] != null) return false;
}
}
return true;
}
/**
* J2me's Hashtable does not implement equal, Bummer!
*/
private static boolean compareHashtable(Hashtable h1, Hashtable h2) {
if (h1 == h2) { // null == null is caught here
return true;
}
if (h1 == null || h2 == null) {
return false;
}
if (h1.size() != h2.size()) {
return false;
}
// Ensure the values are the same.
Enumeration h1Keys = h1.keys();
while (h1Keys.hasMoreElements()) {
Object key = h1Keys.nextElement();
Object h1Value = h1.get(key);
Object h2Value = h2.get(key);
if (!h1Value.equals(h2Value)) {
return false;
}
}
return true;
}
/**
* Expands lower buffer iff the key does not fit to current buffer size,
* but will fit in MAX buffer size.
*/
private void expandLowerIfNecessary(int key) {
if (key <= MAX_LOWER_BUFFER_SIZE && key >= lower.length && key > 0) {
int size = lower.length;
do {
size <<= 1;
} while (size <= key);
size = Math.min(size, MAX_LOWER_BUFFER_SIZE);
Object[] newLower = new Object[size];
System.arraycopy(lower, 0, newLower, 0, lower.length);
lower = newLower;
}
}
/* {@inheritDoc} */
public String toString() {
StringBuffer buffer = new StringBuffer("IntMap{lower:");
for (int i = 0; i < lower.length; i++) {
if (lower[i] != null) {
buffer.append(i);
buffer.append("=>");
buffer.append(lower[i]);
buffer.append(", ");
}
}
buffer.append(", higher:" + higher + "}");
return buffer.toString();
}
}

316
src/com/google/common/io/protocol/ProtoBuf.java
View File

@ -7,9 +7,7 @@ import java.io.*;
import java.util.*;
/**
* Protocol buffer message object. Currently, it is assumed that tags ids are
* not large. This could be improved by storing a start offset, reducing the
* assumption to a dense number space.
* Protocol buffer message object.
* <p>
* ProtoBuf instances may or may not reference a ProtoBufType instance,
* representing information from a corresponding .proto file, which defines tag
@ -33,7 +31,6 @@ import java.util.*;
* this behavior is that default values cannot be removed -- they would reappear
* after a serialization cycle. If a tag has repeated values, setXXX(tag, value)
* will overwrite all of them and getXXX(tag) will throw an exception.
*
*/
public class ProtoBuf {
@ -45,7 +42,9 @@ public class ProtoBuf {
private static final String MSG_MISMATCH = "Type mismatch";
private static final String MSG_UNSUPPORTED = "Unsupp.Type";
// names copied from //net/proto2/internal/wire_format.cc
// see
// http://code.google.com/apis/protocolbuffers/docs/overview.html
// for more details about wire format.
static final int WIRETYPE_END_GROUP = 4;
static final int WIRETYPE_FIXED32 = 5;
static final int WIRETYPE_FIXED64 = 1;
@ -56,20 +55,19 @@ public class ProtoBuf {
/** Maximum number of bytes for VARINT wire format (64 bit, 7 bit/byte) */
private static final int VARINT_MAX_BYTES = 10;
private static Long[] SMALL_NUMBERS = {
new Long(0), new Long(1), new Long(2), new Long(3), new Long(4),
new Long(5), new Long(6), new Long(7), new Long(8), new Long(9),
new Long(10), new Long(11), new Long(12), new Long(13), new Long(14),
new Long(15)};
private ProtoBufType msgType;
private final Vector values = new Vector();
private final IntMap values;
/**
* Wire types picked up on the wire or implied by setters (if no other
* type information is available.
*/
private final StringBuffer wireTypes = new StringBuffer();
private final IntMap wireTypes;
/**
* Saved by a call to #getCachedDataSize(false) and returned in #getCachedSize()
*/
private int cachedSize = Integer.MIN_VALUE;
/**
* Creates a protocol message according to the given description. The
@ -78,14 +76,22 @@ public class ProtoBuf {
*/
public ProtoBuf(ProtoBufType type) {
this.msgType = type;
if (type != null) {
// if the type is known, use the type to create IntMaps.
values = type.newIntMapForProtoBuf();
wireTypes = type.newIntMapForProtoBuf();
} else {
values = new IntMap();
wireTypes = new IntMap();
}
}
/**
/**
* Clears all data stored in this ProtoBuf.
*/
public void clear() {
values.setSize(0);
wireTypes.setLength(0);
values.clear();
wireTypes.clear();
}
/**
@ -210,7 +216,7 @@ public class ProtoBuf {
return (int) ((Long) getObject(tag, ProtoBufType.TYPE_INT32)).longValue();
}
/**
/**
* Returns the integer value for the given repeated tag at the given index.
*/
public int getInt(int tag, int index) {
@ -305,7 +311,8 @@ public class ProtoBuf {
* @param type the new type
*/
void setType(ProtoBufType type) {
if (values.size() != 0 ||
// reject if the type is already set, or value is alreay set.
if (!values.isEmpty() ||
(msgType != null && type != null && type != msgType)) {
throw new IllegalArgumentException();
}
@ -359,7 +366,8 @@ public class ProtoBuf {
* @return this
* @throws IOException raised if an IO exception occurs in the
* underlying stream or the end of the stream is reached at
* an unexpected position
* an unexpected position, or if we encounter bad data
* while reading.
*/
public int parse(InputStream is, int available) throws IOException {
@ -376,11 +384,7 @@ public class ProtoBuf {
break;
}
int tag = (int) (tagAndType >>> 3);
while (wireTypes.length() <= tag){
wireTypes.append((char) ProtoBufType.TYPE_UNDEFINED);
}
wireTypes.setCharAt(tag, (char) wireType);
wireTypes.put(tag, wireType);
// first step: decode tag value
Object value;
switch (wireType) {
@ -390,8 +394,7 @@ public class ProtoBuf {
if (isZigZagEncodedType(tag)) {
v = zigZagDecode(v);
}
value = (v >= 0 && v < SMALL_NUMBERS.length) ?
SMALL_NUMBERS[(int) v] : new Long(v);
value = v;
break;
// also used for fixed values
@ -408,9 +411,7 @@ public class ProtoBuf {
shift += 8;
}
value = (v >= 0 && v < SMALL_NUMBERS.length)
? SMALL_NUMBERS[(int) v]
: new Long(v);
value = v;
break;
case WIRETYPE_LENGTH_DELIMITED:
@ -445,7 +446,8 @@ public class ProtoBuf {
break;
default:
throw new RuntimeException(MSG_UNSUPPORTED + wireType);
throw new IOException("Unknown wire type " + wireType +
", reading garbage data?");
}
insertObject(tag, getCount(tag), value);
}
@ -466,9 +468,9 @@ public class ProtoBuf {
throw new ArrayIndexOutOfBoundsException();
}
if (count == 1){
values.setElementAt(null, tag);
values.remove(tag);
} else {
Vector v = (Vector) values.elementAt(tag);
Vector v = (Vector) values.get(tag);
v.removeElementAt(index);
}
}
@ -477,12 +479,15 @@ public class ProtoBuf {
* Returns the number of repeated and optional (0..1) values for a given tag.
* Note: Default values are not counted (and in general not considered in
* access methods for repeated tags), but considered for has(tag).
*
* @param tag the tag of the field
* @throws ArrayIndexOutOfBoundsException when tag is < 0
*/
public int getCount(int tag) {
if (tag >= values.size()){
return 0;
if (tag < 0) {
throw new ArrayIndexOutOfBoundsException(tag);
}
Object o = values.elementAt(tag);
Object o = values.get(tag);
if (o == null){
return 0;
}
@ -502,38 +507,69 @@ public class ProtoBuf {
tagType = msgType.getType(tag);
}
if (tagType == ProtoBufType.TYPE_UNDEFINED && tag < wireTypes.length()) {
tagType = wireTypes.charAt(tag);
if (tagType == ProtoBufType.TYPE_UNDEFINED) {
Integer tagTypeObj = (Integer) wireTypes.get(tag);
if (tagTypeObj != null) {
tagType = tagTypeObj.intValue();
}
}
if (tagType == ProtoBufType.TYPE_UNDEFINED && getCount(tag) > 0) {
Object o = getObject(tag, 0, ProtoBufType.TYPE_UNDEFINED);
tagType = (o instanceof Long) || (o instanceof Boolean)
tagType = (o instanceof Long) || (o instanceof Boolean)
? WIRETYPE_VARINT : WIRETYPE_LENGTH_DELIMITED;
}
return tagType;
}
/**
* Returns the number of bytes needed to store this protocol buffer
*/
public int getDataSize() {
int size = 0;
for (int tag = 0; tag <= maxTag(); tag++) {
for (int i = 0; i < getCount(tag); i++) {
size += getDataSize(tag, i);
}
}
return size;
return getCachedDataSize(false /* don't trust cache */);
}
/**
* Returns the size of the given value
/**
* Each Protobuf keeps track of a <code> cachedSize </code> that is
* used to short circuit evaluation of its children's sizes. This value
* should only be trusted if you are reasonably certain it cannot be
* corrupt. (A corrupt cache can happen if any child ProtoBuf of this
* ProtoBuf has had a value set. In general, it is best to only trust
* the cache if you have just finished cleansing it.)
*
* <P/>The cache can be cleansed by calling this method with
* trustCache = false.
*
* @param trustCache if the cached size should be trusted. Set false to
* recompuate the size.
*/
private int getDataSize(int tag, int i) {
private int getCachedDataSize(boolean trustCache) {
if (cachedSize != Integer.MIN_VALUE && trustCache) {
return cachedSize;
}
int size = 0;
IntMap.KeyIterator itr = values.keys();
while(itr.hasNext()) {
int tag = itr.next();
for (int i = 0; i < getCount(tag); i++) {
size += getCachedDataSize(tag, i, trustCache);
}
}
cachedSize = size;
return cachedSize;
}
/**
* Returns the size of the child.
*
* @param tag tag used to determine the type of this child
* @param i used to determine which count this child is
* @param trustSizeCache passed down to #getCachedDataSize()
*/
private int getCachedDataSize(int tag, int i, boolean trustSizeCache) {
int tagSize = getVarIntSize(tag << 3);
switch(getWireType(tag)){
@ -551,20 +587,20 @@ public class ProtoBuf {
// take end group into account....
return tagSize + getProtoBuf(tag, i).getDataSize() + tagSize;
}
// take the object as stored
Object o = getObject(tag, i, ProtoBufType.TYPE_UNDEFINED);
int contentSize;
if (o instanceof byte[]){
if (o instanceof byte[]) {
contentSize = ((byte[]) o).length;
} else if (o instanceof String) {
contentSize = encodeUtf8((String) o, null, 0);
} else {
contentSize = ((ProtoBuf) o).getDataSize();
contentSize = ((ProtoBuf) o).getCachedDataSize(trustSizeCache);
}
return tagSize + getVarIntSize(contentSize) + contentSize;
}
@ -584,67 +620,93 @@ public class ProtoBuf {
return size;
}
/**
/**
* Writes this and nested protocol buffers to the given output stream.
*
* @param os target output stream
* @throws IOException thrown if there is an IOException
* @throws IOException thrown if there is an IOException
*/
public void outputTo(OutputStream os) throws IOException {
for (int tag = 0; tag <= maxTag(); tag++) {
int size = getCount(tag);
int wireType = getWireType(tag);
// ignore default values
for (int i = 0; i < size; i++) {
writeVarInt(os, (tag << 3) | wireType);
// We can't know what changed since we last output, so refresh the children.
getDataSize();
outputToInternal(os);
}
switch (wireType) {
case WIRETYPE_FIXED32:
case WIRETYPE_FIXED64:
long v = ((Long) getObject(tag, i, ProtoBufType.TYPE_INT64))
.longValue();
int cnt = (wireType == WIRETYPE_FIXED32) ? 4 : 8;
for (int b = 0; b < cnt; b++) {
os.write((int) (v & 0x0ff));
v >>= 8;
}
break;
/**
* Recursive output method wrapped by #outputTo()
*
* @param os target output stream
* @throws IOException thrown if there is an IOException
*/
private void outputToInternal(OutputStream os) throws IOException {
IntMap.KeyIterator itr = values.keys();
while (itr.hasNext()) {
int tag = itr.next();
outputField(tag, os);
}
}
case WIRETYPE_VARINT:
v = ((Long) getObject(tag, i, ProtoBufType.TYPE_INT64)).longValue();
if (isZigZagEncodedType(tag)) {
v = zigZagEncode(v);
}
writeVarInt(os, v);
break;
/**
* Output a field indicated by the tag to given stream.
*
* @param tag the tag of the field to output.
* @param os target output stream
* @throws IOException thrown if there is an IOException
*/
private void outputField(int tag, OutputStream os) throws IOException {
int size = getCount(tag);
int wireType = getWireType(tag);
int wireTypeTag = (tag << 3) | wireType;
case WIRETYPE_LENGTH_DELIMITED:
Object o = getObject(tag, i,
getType(tag) == ProtoBufType.TYPE_MESSAGE
? ProtoBufType.TYPE_UNDEFINED
: ProtoBufType.TYPE_DATA);
if (o instanceof byte[]){
byte[] data = (byte[]) o;
writeVarInt(os, data.length);
os.write(data);
} else {
ProtoBuf msg = (ProtoBuf) o;
writeVarInt(os, msg.getDataSize());
msg.outputTo(os);
}
break;
// ignore default values
for (int i = 0; i < size; i++) {
writeVarInt(os, wireTypeTag);
switch (wireType) {
case WIRETYPE_FIXED32:
case WIRETYPE_FIXED64:
long v = ((Long) getObject(tag, i, ProtoBufType.TYPE_INT64))
.longValue();
int cnt = (wireType == WIRETYPE_FIXED32) ? 4 : 8;
for (int b = 0; b < cnt; b++) {
os.write((int) (v & 0x0ff));
v >>= 8;
}
break;
case WIRETYPE_START_GROUP:
((ProtoBuf) getObject(tag, i, ProtoBufType.TYPE_GROUP))
.outputTo(os);
writeVarInt(os, (tag << 3) | WIRETYPE_END_GROUP);
break;
default:
throw new IllegalArgumentException();
}
case WIRETYPE_VARINT:
v = ((Long) getObject(tag, i, ProtoBufType.TYPE_INT64)).longValue();
if (isZigZagEncodedType(tag)) {
v = zigZagEncode(v);
}
writeVarInt(os, v);
break;
case WIRETYPE_LENGTH_DELIMITED:
Object o = getObject(tag, i,
getType(tag) == ProtoBufType.TYPE_MESSAGE
? ProtoBufType.TYPE_UNDEFINED
: ProtoBufType.TYPE_DATA);
if (o instanceof byte[]) {
byte[] data = (byte[]) o;
writeVarInt(os, data.length);
os.write(data);
} else {
ProtoBuf msg = (ProtoBuf) o;
writeVarInt(os, msg.getCachedDataSize(true));
msg.outputToInternal(os);
}
break;
case WIRETYPE_START_GROUP:
((ProtoBuf) getObject(tag, i, ProtoBufType.TYPE_GROUP))
.outputToInternal(os);
writeVarInt(os, (tag << 3) | WIRETYPE_END_GROUP);
break;
default:
throw new IllegalArgumentException();
}
}
}
@ -693,12 +755,12 @@ public class ProtoBuf {
outputTo(baos);
return baos.toByteArray();
}
/**
* Returns the largest tag id used in this message (to simplify testing).
*/
public int maxTag() {
return values.size() - 1;
return values.maxKey();
}
/**
@ -726,8 +788,7 @@ public class ProtoBuf {
* Sets the given tag to the given long value.
*/
public void setLong(int tag, long value) {
setObject(tag, value >= 0 && value < SMALL_NUMBERS.length
? SMALL_NUMBERS[(int) value] : new Long(value));
setObject(tag, value);
}
/**
@ -795,8 +856,7 @@ public class ProtoBuf {
* Inserts the given long value for the given tag at the given index.
*/
public void insertLong(int tag, int index, long value) {
insertObject(tag, index, value >= 0 && value < SMALL_NUMBERS.length
? SMALL_NUMBERS[(int) value] : new Long(value));
insertObject(tag, index, value);
}
/**
@ -879,8 +939,8 @@ public class ProtoBuf {
case ProtoBufType.TYPE_GROUP:
case ProtoBufType.TYPE_MESSAGE:
if (msgType == null || msgType.getData(tag) == null ||
((ProtoBuf) object).msgType == null ||
((ProtoBuf) object).msgType == msgType.getData(tag)) {
((ProtoBuf) object).msgType == null ||
((ProtoBuf) object).msgType.equals(msgType.getData(tag))) {
return;
}
}
@ -944,7 +1004,7 @@ public class ProtoBuf {
throw new ArrayIndexOutOfBoundsException();
}
Object o = values.elementAt(tag);
Object o = values.get(tag);
Vector v = null;
if (o instanceof Vector) {
@ -1025,14 +1085,14 @@ public class ProtoBuf {
if (count == 0) {
setObject(tag, o);
} else {
Object curr = values.elementAt(tag);
Object curr = values.get(tag);
Vector v;
if (curr instanceof Vector) {
v = (Vector) curr;
} else {
v = new Vector();
v.addElement(curr);
values.setElementAt(v, tag);
values.put(tag, v);
}
v.insertElementAt(o, index);
}
@ -1042,7 +1102,7 @@ public class ProtoBuf {
* Converts the object if a better suited class exists for the given .proto
* type. If the formats are not compatible, an exception is thrown.
*/
private Object convert(Object obj, int tagType) {
private static Object convert(Object obj, int tagType) {
switch (tagType) {
case ProtoBufType.TYPE_UNDEFINED:
return obj;
@ -1068,7 +1128,7 @@ public class ProtoBuf {
case ProtoBufType.TYPE_SINT32:
case ProtoBufType.TYPE_SINT64:
if (obj instanceof Boolean) {
return SMALL_NUMBERS[((Boolean) obj).booleanValue() ? 1 : 0];
return ((Boolean) obj).booleanValue() ? 1 : 0;
}
return obj;
case ProtoBufType.TYPE_DATA:
@ -1153,13 +1213,13 @@ public class ProtoBuf {
* values.
*/
private void setObject(int tag, Object o) {
if (values.size() <= tag) {
values.setSize(tag + 1);
if (tag < 0) {
throw new ArrayIndexOutOfBoundsException();
}
if (o != null) {
assertTypeMatch(tag, o);
}
values.setElementAt(o, tag);
values.put(tag, o);
}
/**

106
src/com/google/common/io/protocol/ProtoBufType.java
View File

@ -6,9 +6,8 @@ package com.google.common.io.protocol;
import java.util.*;
/**
* This class can be used to create a memory model of a .proto file. Currently,
* it is assumed that tags ids are not large. This could be improved by storing
* a start offset, relaxing the assumption to a dense number space.
* This class can be used to create a memory model of a .proto file.
*
*/
public class ProtoBufType {
// Note: Values 0..15 are reserved for wire types!
@ -42,11 +41,46 @@ public class ProtoBufType {
public static final int REQUIRED = 0x100;
public static final int OPTIONAL = 0x200;
public static final int REPEATED = 0x400;
private final StringBuffer types = new StringBuffer();
private final Vector data = new Vector();
private final IntMap types = new IntMap();
/*
* A struct to store field type and default object.
* Two TypeInfo objects are equal iff both have the
* euqal type and object.
*/
static class TypeInfo {
private int type;
private Object data;
TypeInfo(int t, Object d) {
type = t;
data = d;
}
public int hashCode() {
return type;
}
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj == null || !(obj instanceof TypeInfo)) {
return false;
}
TypeInfo peerTypeInfo = (TypeInfo) obj;
return type == peerTypeInfo.type &&
(data == peerTypeInfo.data ||
(data != null && data.equals(peerTypeInfo.data)));
}
public String toString() {
return "TypeInfo{type=" + type + ", data=" + data + "}";
}
};
private final String typeName;
/**
* Empty constructor.
*/
@ -74,35 +108,36 @@ public class ProtoBufType {
* @return this is returned to permit cascading
*/
public ProtoBufType addElement(int optionsAndType, int tag, Object data) {
while (types.length() <= tag) {
types.append((char) TYPE_UNDEFINED);
this.data.addElement(null);
}
types.setCharAt(tag, (char) optionsAndType);
this.data.setElementAt(data, tag);
types.put(tag, new TypeInfo(optionsAndType, data));
return this;
}
/**
* Returns a IntMap that has the same lower buffer size as types.
* This is for ProtoBuf to create IntMap with pre-allocated
* internal buffer.
*/
/* package protected */ IntMap newIntMapForProtoBuf() {
return types.newIntMapWithSameBufferSize();
}
/**
* Returns the type for the given tag id (without modifiers such as OPTIONAL,
* REPEATED). For undefined tags, TYPE_UNDEFINED is returned.
*/
public int getType(int tag) {
return (tag < 0 || tag >= types.length())
? TYPE_UNDEFINED
: (types.charAt(tag) & MASK_TYPE);
TypeInfo typeInfo = (TypeInfo) types.get(tag);
return typeInfo == null ? TYPE_UNDEFINED : typeInfo.type & MASK_TYPE;
}
/**
/**
* Returns a bit combination of the modifiers for the given tag id
* (OPTIONAL, REPEATED, REQUIRED). For undefined tags, OPTIONAL|REPEATED
* is returned.
*/
*/
public int getModifiers(int tag) {
return (tag < 0 || tag >= types.length())
? (OPTIONAL | REPEATED)
: (types.charAt(tag) & MASK_MODIFIER);
TypeInfo typeInfo = (TypeInfo) types.get(tag);
return typeInfo == null ? (OPTIONAL | REPEATED) : typeInfo.type & MASK_MODIFIER;
}
/**
@ -111,14 +146,15 @@ public class ProtoBufType {
* tags, null is returned.
*/
public Object getData(int tag) {
return (tag < 0 || tag >= data.size()) ? null : data.elementAt(tag);
TypeInfo typeInfo = (TypeInfo) types.get(tag);
return typeInfo == null ? typeInfo : typeInfo.data;
}
/**
* Returns the type name set in the constructor for debugging purposes.
*/
public String toString() {
return typeName;
return "ProtoBufType Name: " + typeName;
}
/**
@ -138,9 +174,9 @@ public class ProtoBufType {
}
ProtoBufType other = (ProtoBufType) object;
return stringEquals(types, other.types);
return types.equals(other.types);
}
/**
* {@inheritDoc}
*/
@ -151,20 +187,4 @@ public class ProtoBufType {
return super.hashCode();
}
}
public static boolean stringEquals(CharSequence a, CharSequence b) {
if (a == b) return true;
int length;
if (a != null && b != null && (length = a.length()) == b.length()) {
if (a instanceof String && b instanceof String) {
return a.equals(b);
} else {
for (int i = 0; i < length; i++) {
if (a.charAt(i) != b.charAt(i)) return false;
}
return true;
}
}
return false;
}
}

19
src/com/google/common/io/protocol/ProtoBufUtil.java
View File

@ -22,6 +22,25 @@ public final class ProtoBufUtil {
}
}
/** Convenience method to return a string value from of a proto or null. */
public static String getProtoValueOrNull(ProtoBuf proto, int tag) {
try {
return (proto != null && proto.has(tag)) ? proto.getString(tag) : null;
} catch (ClassCastException e) {
return null;
}
}
/** Convenience method to return a string value from of a proto or null. */
public static String getProtoValueOrNull(ProtoBuf proto, int tag, int index) {
try {
return (proto != null && proto.has(tag) && proto.getCount(tag) > index) ?
proto.getString(tag, index) : null;
} catch (ClassCastException e) {
return null;
}
}
/** Convenience method to return a string value from of a sub-proto or "". */
public static String getSubProtoValueOrEmpty(
ProtoBuf proto, int sub, int tag) {