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/*
* Copyright 2007 - 2018 ETH Zuerich, CISD and SIS.
*
* Licensed 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 ch.systemsx.cisd.hdf5.h5ar;
import java.io.File;
import java.io.IOException;
import hdf.hdf5lib.exceptions.HDF5Exception;
import ch.systemsx.cisd.base.exceptions.IErrorStrategy;
import ch.systemsx.cisd.hdf5.IHDF5Reader;
/**
* A traverser for <code>h5ar</code> archives.
*
* @author Bernd Rinn
*/
class HDF5ArchiveTraverser
{
interface IDirectoryChecker
{
boolean isDirectoryFollowSymlinks(ArchiveEntry entry);
}
private final IHDF5Reader hdf5Reader;
private final IDirectoryIndexProvider indexProvider;
private final IErrorStrategy errorStrategy;
private final IdCache idCache;
private final IDirectoryChecker directoryChecker;
public HDF5ArchiveTraverser(IDirectoryChecker directoryChecker, IHDF5Reader hdf5Reader,
IDirectoryIndexProvider indexProvider, IdCache idCache)
{
this.directoryChecker = directoryChecker;
this.hdf5Reader = hdf5Reader;
this.indexProvider = indexProvider;
this.errorStrategy = indexProvider.getErrorStrategy();
this.idCache = idCache;
}
public void process(String fileOrDir, boolean recursive, boolean readLinkTargets,
boolean followSymlinks, IArchiveEntryProcessor processor)
{
final String normalizedPath = Utils.normalizePath(fileOrDir);
final boolean isDirectory = hdf5Reader.object().isGroup(normalizedPath, followSymlinks);
final boolean effectiveReadLinkTargets = readLinkTargets | followSymlinks;
final String parentPath = Utils.getParentPath(normalizedPath);
LinkRecord link = null;
if (parentPath.length() > 0)
{
link =
indexProvider.get(parentPath, effectiveReadLinkTargets).tryGetLink(
getNameFromPath(normalizedPath, parentPath));
if (link == null)
{
errorStrategy.dealWithError(processor.createException(normalizedPath,
"Object not found in archive."));
return;
}
try
{
if (processor.process(parentPath, normalizedPath, link, hdf5Reader, idCache,
errorStrategy) == false)
{
return;
}
} catch (IOException ex)
{
final File f = new File(normalizedPath);
errorStrategy.dealWithError(processor.createException(f, ex));
} catch (HDF5Exception ex)
{
errorStrategy.dealWithError(processor.createException(normalizedPath, ex));
}
}
if (isDirectory)
{
processDirectory(normalizedPath, recursive, effectiveReadLinkTargets, followSymlinks,
processor);
postProcessDirectory(parentPath, normalizedPath, link, processor);
}
}
private String getNameFromPath(final String normalizedPath, final String parentPath)
{
return normalizedPath.substring(parentPath.length() == 1 ? 1 : parentPath.length() + 1);
}
private void postProcessDirectory(final String parentPath, final String normalizedPath,
LinkRecord linkOrNull, IArchiveEntryProcessor processor)
{
if (linkOrNull != null)
{
try
{
processor.postProcessDirectory(parentPath, normalizedPath, linkOrNull, hdf5Reader,
idCache, errorStrategy);
} catch (IOException ex)
{
final File f = new File(normalizedPath);
errorStrategy.dealWithError(processor.createException(f, ex));
} catch (HDF5Exception ex)
{
errorStrategy.dealWithError(processor.createException(normalizedPath, ex));
}
}
}
/**
* Provide the entries of <var>normalizedDir</var> to <var>processor</var>.
*/
private void processDirectory(String normalizedDir, boolean recursive, boolean readLinkTargets,
boolean followSymlinks, IArchiveEntryProcessor processor)
{
if (hdf5Reader.object().exists(normalizedDir, followSymlinks) == false)
{
if (hdf5Reader.object().exists(normalizedDir, false) == false)
{
errorStrategy.dealWithError(processor.createException(normalizedDir,
"Directory not found in archive."));
}
return;
}
for (LinkRecord link : indexProvider.get(normalizedDir, readLinkTargets))
{
final String path = Utils.concatLink(normalizedDir, link.getLinkName());
try
{
if (processor
.process(normalizedDir, path, link, hdf5Reader, idCache, errorStrategy) == false)
{
continue;
}
if (recursive && isDirectory(path, link, followSymlinks))
{
processDirectory(path, recursive, readLinkTargets, followSymlinks, processor);
postProcessDirectory(normalizedDir, path, link, processor);
}
} catch (IOException ex)
{
final File f = new File(path);
errorStrategy.dealWithError(processor.createException(f, ex));
} catch (HDF5Exception ex)
{
errorStrategy.dealWithError(processor.createException(path, ex));
}
}
}
private boolean isDirectory(String path, LinkRecord link, boolean followSymlinks)
{
if (link.isDirectory() == false && followSymlinks)
{
return directoryChecker.isDirectoryFollowSymlinks(toArchiveEntry(path, link));
} else
{
return link.isDirectory();
}
}
private ArchiveEntry toArchiveEntry(String path, LinkRecord linkRecord)
{
final String normalizedPath = Utils.normalizePath(path);
final String parentPath = Utils.getParentPath(normalizedPath);
return Utils.tryToArchiveEntry(parentPath, normalizedPath, linkRecord, idCache);
}
}
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