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/*******************************************************************************
* Copyright (c) 2002-2005 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM - Initial API and implementation
*******************************************************************************/
package org.eclipse.wst.wsi.internal.core.wsdl.xsd;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
/**
* This class allows InputStreams to be created and returned to xerces without
* actually opening file handles or network connections until it is absolutely
* neccessary.
*/
public class LazyURLInputStream extends InputStream
{
private static int debugTotalOpenStreamCount = 0;
protected InputStream inner;
protected String url;
protected boolean error;
boolean hasMarks;
boolean pretendFileIsStillOpen;
public LazyURLInputStream(String url)
{
this.url = url;
inner = null;
pretendFileIsStillOpen = false;
}
private void createInnerStreamIfRequired() throws IOException
{
if (inner == null && !error)
{
debugTotalOpenStreamCount++;
//System.out.println("Creating stream (" + debugTotalOpenStreamCount + ")-- " + url);
try
{
inner = new URL(url).openStream();
pretendFileIsStillOpen = false;
hasMarks = false;
}
finally
{
if (inner == null)
{
error = true;
}
}
}
}
protected void closeStream() throws IOException {
if (inner != null && !pretendFileIsStillOpen) {
inner.close();
pretendFileIsStillOpen = true;
}
}
public int available() throws IOException
{
if (pretendFileIsStillOpen) return 0;
createInnerStreamIfRequired();
if (inner == null) throw new IOException("Stream not available");
return inner.available();
}
public void close() throws IOException
{
if (pretendFileIsStillOpen) {
// Stop behaving as if the stream were still open.
pretendFileIsStillOpen = false;
} else {
if (inner != null) {
debugTotalOpenStreamCount--;
//System.out.println("Closing stream (" + debugTotalOpenStreamCount + ") -- " + url);
inner.close();
}
}
}
public void mark(int readlimit)
{
if (pretendFileIsStillOpen) return;
hasMarks = true;
try {
createInnerStreamIfRequired();
inner.mark(readlimit);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public boolean markSupported()
{
if (pretendFileIsStillOpen) return false;
try {
createInnerStreamIfRequired();
if (inner == null) return false;
return inner.markSupported();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return false;
}
public int read() throws IOException
{
if (pretendFileIsStillOpen) return -1;
createInnerStreamIfRequired();
if (inner == null) throw new IOException("Stream not available");
int bytesRead = inner.read();
if (bytesRead == -1 && !hasMarks) closeStream();
return bytesRead;
}
public int read(byte[] b) throws IOException {
if (pretendFileIsStillOpen) return -1;
createInnerStreamIfRequired();
if (inner == null) throw new IOException("Stream not available");
int bytesRead = inner.read(b);
if (bytesRead == -1 && !hasMarks) closeStream();
return bytesRead;
}
public int read(byte[] b, int off, int len) throws IOException
{
if (pretendFileIsStillOpen) return -1;
createInnerStreamIfRequired();
if (inner == null) throw new IOException("Stream not available");
int bytesRead = inner.read(b, off, len);
if (bytesRead == -1 && !hasMarks) closeStream();
return bytesRead;
}
public void reset() throws IOException
{
if (pretendFileIsStillOpen) return;
createInnerStreamIfRequired();
if (inner == null) throw new IOException("Stream not available");
inner.reset();
}
public long skip(long n) throws IOException
{
if (pretendFileIsStillOpen) return 0;
createInnerStreamIfRequired();
if (inner == null) throw new IOException("Stream not available");
return inner.skip(n);
}
}
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