/*
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.apache.flex.compiler.internal.filespecs;
import static org.apache.flex.compiler.filespecs.CombinedFile.getBOM;
import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import org.apache.flex.compiler.filespecs.IBinaryFileSpecification;
import org.apache.flex.compiler.filespecs.CombinedFile.BOM;
import org.apache.flex.swc.ISWCFileEntry;
/**
* A SWCFileSpecification allows us to attach read a file from a SWC. This allows us to treat the SWC as one FileSpec
*/
public class SWCFileSpecification implements IBinaryFileSpecification
{
/**
* @param path Filename contained within the manifest.
* @param fileEntry ISWCFileEntry within the SWC. May be null if
* the file does not exist within the SWC. FileNotFound exception
* will be thrown if this IFileSpecification is read
*/
public SWCFileSpecification(String path, ISWCFileEntry fileEntry)
{
assert (fileEntry == null || fileEntry.getPath().equals(path)) : "fileEntry path must equal specified path";
this.path = path;
this.fileEntry = fileEntry;
}
private final String path;
private final ISWCFileEntry fileEntry;
@Override
public String getPath()
{
return path;
}
@Override
public Reader createReader() throws FileNotFoundException
{
if (fileEntry == null)
throw new FileNotFoundException(path);
try
{
return createNIOReader();
}
catch (FileNotFoundException e)
{
throw e;
}
catch (final IOException e)
{
// could not open the file, but the file seems to exist.
// we can either return null, or maybe a reader that pretends
// the file is empty or throws an IOException as soon as you try to read
// from it.
// We'll return a Reader that just throws the above IOException when
// someone tries to read some characters.
return new Reader()
{
@Override
public int read(char[] cbuf, int off, int len) throws IOException
{
throw e;
}
@Override
public void close() throws IOException
{
}
};
}
}
@Override
public long getLastModified()
{
if (fileEntry == null)
return Long.MAX_VALUE - 1;
return fileEntry.getLastModified();
}
@Override
public boolean isOpenDocument()
{
return false;
}
@Override
public InputStream createInputStream() throws IOException
{
if (fileEntry == null)
throw new FileNotFoundException(path);
return fileEntry.createInputStream();
}
private Reader createNIOReader() throws IOException
{
InputStream strm = createInputStream();
BufferedInputStream bufferedStrm;
if (strm instanceof BufferedInputStream)
bufferedStrm = (BufferedInputStream)strm;
else
bufferedStrm = new BufferedInputStream(strm);
// Skip BOM header.
final BOM bom = getBOM(bufferedStrm);
bufferedStrm.skip(bom.pattern.length);
return new BufferedReader(new InputStreamReader(bufferedStrm, bom.charset));
}
}