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Copy pathOutputBuffer.java
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159 lines (134 loc) · 4.38 KB
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// OutputBuffer.java
/**
* Copyright (C) 2008 10gen 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 org.bson.io;
import java.io.*;
import java.security.*;
public abstract class OutputBuffer extends OutputStream {
public abstract void write(byte[] b);
public abstract void write(byte[] b, int off, int len);
public abstract void write(int b);
public abstract int getPosition();
public abstract void setPosition( int position );
public abstract void seekEnd();
public abstract void seekStart();
/**
* @return size of data so far
*/
public abstract int size();
/**
* @return bytes written
*/
public abstract int pipe( OutputStream out )
throws IOException;
/**
* mostly for testing
*/
public byte [] toByteArray(){
try {
final ByteArrayOutputStream bout = new ByteArrayOutputStream( size() );
pipe( bout );
return bout.toByteArray();
}
catch ( IOException ioe ){
throw new RuntimeException( "should be impossible" , ioe );
}
}
public String asString(){
return new String( toByteArray() );
}
public String asString( String encoding )
throws UnsupportedEncodingException {
return new String( toByteArray() , encoding );
}
public String hex(){
final StringBuilder buf = new StringBuilder();
try {
pipe( new OutputStream(){
public void write( int b ){
String s = Integer.toHexString(0xff & b);
if (s.length() < 2)
buf.append("0");
buf.append(s);
}
}
);
}
catch ( IOException ioe ){
throw new RuntimeException( "impossible" );
}
return buf.toString();
}
public String md5(){
final MessageDigest md5 ;
try {
md5 = MessageDigest.getInstance("MD5");
}
catch (NoSuchAlgorithmException e) {
throw new RuntimeException("Error - this implementation of Java doesn't support MD5.");
}
md5.reset();
try {
pipe( new OutputStream(){
public void write( byte[] b , int off , int len ){
md5.update( b , off , len );
}
public void write( int b ){
md5.update( (byte)(b&0xFF) );
}
}
);
}
catch ( IOException ioe ){
throw new RuntimeException( "impossible" );
}
return com.mongodb.util.Util.toHex( md5.digest() );
}
public void writeInt( int x ){
write( x >> 0 );
write( x >> 8 );
write( x >> 16 );
write( x >> 24 );
}
public void writeIntBE( int x ){
write( x >> 24 );
write( x >> 16 );
write( x >> 8 );
write( x );
}
public void writeInt( int pos , int x ){
final int save = getPosition();
setPosition( pos );
writeInt( x );
setPosition( save );
}
public void writeLong( long x ){
write( (byte)(0xFFL & ( x >> 0 ) ) );
write( (byte)(0xFFL & ( x >> 8 ) ) );
write( (byte)(0xFFL & ( x >> 16 ) ) );
write( (byte)(0xFFL & ( x >> 24 ) ) );
write( (byte)(0xFFL & ( x >> 32 ) ) );
write( (byte)(0xFFL & ( x >> 40 ) ) );
write( (byte)(0xFFL & ( x >> 48 ) ) );
write( (byte)(0xFFL & ( x >> 56 ) ) );
}
public void writeDouble( double x ){
writeLong( Double.doubleToRawLongBits( x ) );
}
public String toString(){
return getClass().getName() + " size: " + size() + " pos: " + getPosition() ;
}
}