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CalcSizeStream.java
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CalcSizeStream.java
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/*
* Copyright 2015 Odnoklassniki Ltd, Mail.Ru Group
*
* 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 one.nio.serial;
import one.nio.util.Utf8;
import java.io.IOException;
import java.io.ObjectOutput;
public class CalcSizeStream extends SerializationContext implements ObjectOutput {
protected int count;
protected boolean hasCycles;
public CalcSizeStream() {
}
public CalcSizeStream(int capacity) {
super(capacity);
}
public int count() {
return count;
}
public boolean hasCycles() {
return hasCycles;
}
public void add(int constant) {
count += constant;
}
@Override
public void write(int b) {
count++;
}
@Override
public void write(byte[] b) {
count += b.length;
}
@Override
public void write(byte[] b, int off, int len) {
count += len;
}
@Override
public void writeBoolean(boolean v) {
count++;
}
@Override
public void writeByte(int v) {
count++;
}
@Override
public void writeShort(int v) {
count += 2;
}
@Override
public void writeChar(int v) {
count += 2;
}
@Override
public void writeInt(int v) {
count += 4;
}
@Override
public void writeLong(long v) {
count += 8;
}
@Override
public void writeFloat(float v) {
count += 4;
}
@Override
public void writeDouble(double v) {
count += 8;
}
@Override
public void writeBytes(String s) {
count += s.length();
}
@Override
public void writeChars(String s) {
count += s.length() * 2;
}
@Override
public void writeUTF(String s) {
int length = Utf8.length(s);
count += length + (length <= 0x7fff ? 2 : 4);
}
@Override
@SuppressWarnings("unchecked")
public void writeObject(Object obj) throws IOException {
if (obj == null) {
count++; // null reference is encoded with 1 byte (REF_NULL)
} else {
int index = super.put(obj);
if (index < 0) {
// 1-byte header for built-in serializers, 8-bytes header for all other serializers
Serializer serializer = Repository.get(obj.getClass());
count += serializer.uid < 0 ? 1 : 8;
serializer.calcSize(obj, this);
} else {
// Duplicate reference is encoded with (REF_RECURSIVE + short index) or (REF_RECURSIVE2 + int index)
count += index <= 0xffff ? 3 : 5;
hasCycles = true;
}
}
}
@Override
public void flush() {
// Nothing to do
}
@Override
public void close() {
// Nothing to do
}
}