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/* ====================================================================
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.poi.openxml4j.opc.internal;
import org.apache.logging.log4j.Logger;
import org.apache.poi.logging.PoiLogManager;
import org.apache.poi.openxml4j.exceptions.InvalidFormatException;
import org.apache.poi.openxml4j.exceptions.OpenXML4JException;
import org.apache.poi.openxml4j.opc.OPCPackage;
import org.apache.poi.openxml4j.opc.PackagePart;
import org.apache.poi.openxml4j.opc.PackagePartName;
import org.apache.poi.openxml4j.opc.internal.marshallers.ZipPartMarshaller;
import org.apache.poi.util.Beta;
import org.apache.poi.util.IOUtils;
import org.apache.poi.util.TempFile;
import java.io.*;
import java.nio.file.Files;
/**
* (Experimental) Temp File version of a package part.
*
* @since POI 5.1.0
*/
@Beta
public final class TempFilePackagePart extends PackagePart {
private static final Logger LOG = PoiLogManager.getLogger(TempFilePackagePart.class);
/**
* Storage for the part data.
*/
private File tempFile;
/**
* Constructor.
*
* @param pack
* The owner package.
* @param partName
* The part name.
* @param contentType
* The content type.
* @throws InvalidFormatException
* If the specified URI is not OPC compliant.
* @throws IOException
* If temp file cannot be created.
*/
public TempFilePackagePart(OPCPackage pack, PackagePartName partName,
String contentType) throws InvalidFormatException, IOException {
this(pack, partName, contentType, true);
}
/**
* Constructor.
*
* @param pack
* The owner package.
* @param partName
* The part name.
* @param contentType
* The content type.
* @param loadRelationships
* Specify if the relationships will be loaded.
* @throws InvalidFormatException
* If the specified URI is not OPC compliant.
* @throws IOException
* If temp file cannot be created.
*/
public TempFilePackagePart(OPCPackage pack, PackagePartName partName,
String contentType, boolean loadRelationships)
throws InvalidFormatException, IOException {
super(pack, partName, new ContentType(contentType), loadRelationships);
tempFile = TempFile.createTempFile("poi-package-part", ".tmp");
}
@Override
protected InputStream getInputStreamImpl() throws IOException {
return Files.newInputStream(tempFile.toPath());
}
@Override
protected OutputStream getOutputStreamImpl() throws IOException {
return Files.newOutputStream(tempFile.toPath());
}
@Override
public long getSize() {
return tempFile.length();
}
@Override
public void clear() {
try(OutputStream os = getOutputStreamImpl()) {
os.write(new byte[0]);
} catch (IOException e) {
LOG.atWarn().log("Failed to clear data in temp file", e);
}
}
@Override
public boolean save(OutputStream os) throws OpenXML4JException {
return new ZipPartMarshaller().marshall(this, os);
}
@Override
public boolean load(InputStream is) throws InvalidFormatException {
try (OutputStream os = getOutputStreamImpl()) {
IOUtils.copy(is, os);
} catch(IOException e) {
throw new InvalidFormatException(e.getMessage(), e);
}
// All done
return true;
}
@Override
public void close() {
if (!tempFile.delete()) {
LOG.atInfo().log("Failed to delete temp file; may already have been closed and deleted");
}
}
@Override
public void flush() {
// Do nothing
}
}
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