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package com.sun.xml.bind.v2.runtime.unmarshaller;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import javax.activation.DataHandler;
import javax.activation.DataSource;
import com.sun.xml.bind.DatatypeConverterImpl;
import com.sun.xml.bind.v2.runtime.XMLSerializer;
import com.sun.xml.bind.v2.runtime.output.Pcdata;
import com.sun.xml.bind.v2.runtime.output.UTF8XmlOutput;
import com.sun.xml.bind.v2.util.ByteArrayOutputStreamEx;
import com.sun.istack.Nullable;
/**
* Fed to unmarshaller when the 'text' data is actually
* a virtual image of base64 encoding of the binary data
* transferred on the wire.
*
* Used for the MTOM support.
*
* This object is mutable and the owner of this object can
* reuse it with new data.
*
* Also used by the marshaller to write out the binary data
* that could be possibly attached.
*
* @see XmlVisitor#text(CharSequence)
* @see XMLSerializer#text(Pcdata,String)
*
* @author Kohsuke Kawaguchi
*/
public final class Base64Data extends Pcdata {
// either dataHandler or (data,dataLen,mimeType?) must be present
private DataHandler dataHandler;
private byte[] data;
/**
* Length of the valid data in {@link #data}.
*/
private int dataLen;
/**
* Optional MIME type of {@link #data}.
*
* Unused when {@link #dataHandler} is set.
* Use {@link DataHandler#getContentType()} in that case.
*/
private @Nullable String mimeType;
/**
* Fills in the data object by a portion of the byte[].
*
* @param len
* data[0] to data[len-1] are treated as the data.
*/
public void set(byte[] data, int len, @Nullable String mimeType) {
this.data = data;
this.dataLen = len;
this.dataHandler = null;
this.mimeType = mimeType;
}
/**
* Fills in the data object by the byte[] of the exact length.
*
* @param data
* this buffer may be owned directly by the unmarshaleld JAXB object.
*/
public void set(byte[] data,@Nullable String mimeType) {
set(data,data.length,mimeType);
}
/**
* Fills in the data object by a {@link DataHandler}.
*/
public void set(DataHandler data) {
assert data!=null;
this.dataHandler = data;
this.data = null;
}
/**
* Gets the raw data.
*/
public DataHandler getDataHandler() {
if(dataHandler==null) {
dataHandler = new DataHandler(new DataSource() {
public String getContentType() {
return getMimeType();
}
public InputStream getInputStream() {
return new ByteArrayInputStream(data,0,dataLen);
}
public String getName() {
return null;
}
public OutputStream getOutputStream() {
throw new UnsupportedOperationException();
}
});
}
return dataHandler;
}
/**
* Gets the byte[] of the exact length.
*/
public byte[] getExact() {
get();
if(dataLen!=data.length) {
byte[] buf = new byte[dataLen];
System.arraycopy(data,0,buf,0,dataLen);
data = buf;
}
return data;
}
/**
* Gets the data as an {@link InputStream}.
*/
public InputStream getInputStream() throws IOException {
if(dataHandler!=null)
return dataHandler.getInputStream();
else
return new ByteArrayInputStream(data,0,dataLen);
}
/**
* Returns false if this object only has {@link DataHandler} and therefore
* {@link #get()} operation is likely going to be expensive.
*/
public boolean hasData() {
return data!=null;
}
/**
* Gets the raw data. The size of the byte array maybe larger than the actual length.
*/
public byte[] get() {
if(data==null) {
try {
ByteArrayOutputStreamEx baos = new ByteArrayOutputStreamEx(1024);
InputStream is = dataHandler.getDataSource().getInputStream();
baos.readFrom(is);
is.close();
data = baos.getBuffer();
dataLen = baos.size();
} catch (IOException e) {
// TODO: report the error to the unmarshaller
dataLen = 0; // recover by assuming length-0 data
}
}
return data;
}
public int getDataLen() {
return dataLen;
}
public String getMimeType() {
if(mimeType==null)
return "application/octet-stream";
return mimeType;
}
/**
* Gets the number of characters needed to represent
* this binary data in the base64 encoding.
*/
public int length() {
// for each 3 bytes you use 4 chars
// if the remainder is 1 or 2 there will be 4 more
get(); // fill in the buffer if necessary
return ((dataLen+2)/3)*4;
}
/**
* Encode this binary data in the base64 encoding
* and returns the character at the specified position.
*/
public char charAt(int index) {
// we assume that the length() method is called before this method
// (otherwise how would the caller know that the index is valid?)
// so we assume that the byte[] is already populated
int offset = index%4;
int base = (index/4)*3;
byte b1,b2;
switch(offset) {
case 0:
return DatatypeConverterImpl.encode(data[base]>>2);
case 1:
if(base+1<dataLen)
b1 = data[base+1];
else
b1 = 0;
return DatatypeConverterImpl.encode(
((data[base]&0x3)<<4) |
((b1>>4)&0xF));
case 2:
if(base+1<dataLen) {
b1 = data[base+1];
if(base+2<dataLen)
b2 = data[base+2];
else
b2 = 0;
return DatatypeConverterImpl.encode(
((b1&0xF)<<2)|
((b2>>6)&0x3));
} else
return '=';
case 3:
if(base+2<dataLen)
return DatatypeConverterImpl.encode(data[base+2]&0x3F);
else
return '=';
}
throw new IllegalStateException();
}
/**
* Internally this is only used to split a text to a list,
* which doesn't happen that much for base64.
* So this method should be smaller than faster.
*/
public CharSequence subSequence(int start, int end) {
StringBuilder buf = new StringBuilder();
get(); // fill in the buffer if we haven't done so
for( int i=start; i<end; i++ )
buf.append(charAt(i));
return buf;
}
/**
* Returns the base64 encoded string of this data.
*/
public String toString() {
get(); // fill in the buffer
return DatatypeConverterImpl._printBase64Binary(data, 0, dataLen);
}
public void writeTo(char[] buf, int start) {
get();
DatatypeConverterImpl._printBase64Binary(data, 0, dataLen, buf, start);
}
public void writeTo(UTF8XmlOutput output) throws IOException {
// TODO: this is inefficient if the data source is note byte[] but DataHandler
get();
output.text(data,dataLen);
}
}