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/*
* -----------------------------------------------------------------------------
*
* License and Copyright: The contents of this file are subject to 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.fedora-commons.org/licenses.
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for
* the specific language governing rights and limitations under the License.
*
* The entire file consists of original code.
* Copyright © 2008 Fedora Commons, Inc.
*
Copyright © 2002-2007 The Rector and Visitors of the University of
* Virginia and Cornell University
* All rights reserved.
*
* -----------------------------------------------------------------------------
*/
package fedora.client;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.InputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
/**
*
* Title: DataStream.java
* Description:
* The model of a datastream as it exists inside the editor.
*
* This class has getters and setters for the fields and bytes
* of a datastream while it is being edited.
*
* @author [email protected]
* @version $Id: DataStream.java 3965 2005-04-21 12:52:40Z rlw $
*/
public abstract class DataStream {
/** Empty stream */
public final static ByteArrayInputStream
EMPTY=new ByteArrayInputStream(new byte[0]);
/** Identifier for INLINE datastreams */
public final static int INLINE = 0;
/** Identifier for BASIS datastreams */
public final static int BASIS = 1;
/** The file where the bytes are temporarily stored during editing */
private File m_dataFile;
/** The mime type of the datastream */
private String m_mimeType;
/** The identified for the datastream */
private String m_id;
/** The size of the datastream, in bytes */
private long m_size;
/** Whether this datastream is dirty */
protected boolean m_dirty=true;
/**
* Constructs a datastream with a given temporary directory to
* write itself to, and an identifier.
*/
public DataStream(File tempDir, String id) {
m_id=id;
File m_dataFile=new File(tempDir, id);
clearData();
}
/**
* Returns INLINE or BASIS.
*/
public abstract int getType();
/**
* Gets the id of the datastream inside the object.
*/
public String getId() {
return m_id;
}
/**
* Gets the mime type.
*/
public String getMimeType() {
return m_mimeType;
}
/**
* Sets the mime type.
*/
public void setMimeType(String mimeType) {
m_dirty=true;
m_mimeType=mimeType;
}
/**
* Gets the size, in bytes.
*/
public long getSize() {
return m_size;
}
/**
* Gets an InputStream to the local copy of the datastream.
*/
public InputStream getData()
throws IOException {
if (m_size==0) { return EMPTY; }
return new FileInputStream(m_dataFile);
}
/**
* Reads the bytes from the given InputStream as the data
* for this digital object. When finished, the InputStream
* is closed.
*/
public void setData(InputStream in)
throws IOException {
m_dirty=true;
FileOutputStream out=new FileOutputStream(m_dataFile);
byte[] buf=new byte[4096];
int i=0;
m_size=0;
while((i=in.read(buf))!=-1) {
m_size+=i;
out.write(buf, 0, i);
}
in.close();
out.close();
}
public boolean isDirty() {
return m_dirty;
}
public void setClean() {
m_dirty=false;
}
public void clearData() {
m_size=0;
m_dirty=true;
m_dataFile.delete();
}
}