/*
* JBoss, Home of Professional Open Source
* Copyright 2012, Red Hat Middleware LLC, and individual contributors
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* 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 org.jboss.shrinkwrap.impl.nio.file;
import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.nio.file.FileStore;
import java.nio.file.attribute.BasicFileAttributeView;
import java.nio.file.attribute.FileAttributeView;
import java.nio.file.attribute.FileStoreAttributeView;
import java.util.Collection;
import java.util.Map;
import org.jboss.shrinkwrap.api.Archive;
import org.jboss.shrinkwrap.api.ArchivePath;
import org.jboss.shrinkwrap.api.Node;
import org.jboss.shrinkwrap.api.asset.Asset;
/**
* {@link FileStore} implementation for ShrinkWrap {@link Archive}s; immutable and thread-safe.
*
* @author <a href="mailto:alr@jboss.org">Andrew Lee Rubinger</a>
*/
public class ShrinkWrapFileStore extends FileStore {
/**
* {@link FileStore} type
*/
private static final String TYPE = "shrinkwrap";
/**
* Underlying archive
*/
private final Archive<?> archive;
public ShrinkWrapFileStore(final Archive<?> archive) {
if (archive == null) {
throw new IllegalArgumentException("Underlying archive must be specified");
}
this.archive = archive;
}
/**
* {@inheritDoc}
*
* @see java.nio.file.FileStore#name()
*/
@Override
public String name() {
return archive.getName();
}
/**
* {@inheritDoc}
*
* @see java.nio.file.FileStore#type()
*/
@Override
public String type() {
return TYPE;
}
/**
* {@inheritDoc}
*
* @see java.nio.file.FileStore#isReadOnly()
*/
@Override
public boolean isReadOnly() {
return false;
}
/**
* {@inheritDoc}
*
* @see java.nio.file.FileStore#getTotalSpace()
*/
@Override
public long getTotalSpace() throws IOException {
return this.getUsableSpace() + this.getUsedSpace();
}
/**
* Iterates through the underlying archive, counting the size of each {@link Asset}, returning the fully-tallied
* count in bytes.
*
* @return
*/
public long getUsedSpace() {
long count = 0L;
final int bufferSize = 1024 * 8;// Relatively big buffer (8MB); we're just reading
final Map<ArchivePath, Node> contents = archive.getContent();
final Collection<Node> nodes = contents.values();
for (final Node node : nodes) {
final Asset asset = node.getAsset();
if (asset == null) {
continue; // Directory
}
final InputStream in = new BufferedInputStream(asset.openStream(), bufferSize);
final byte[] buffer = new byte[bufferSize];
int read = 0;
try {
while ((read = in.read(buffer)) != -1) {
// Just count
count += read;
}
} catch (final IOException ioe) {
throw new RuntimeException("Could not count size of archive " + this.archive.getName() + " at "
+ asset.toString(), ioe);
}
}
return count;
}
/**
* {@inheritDoc}
*
* @see java.nio.file.FileStore#getUsableSpace()
*/
@Override
public long getUsableSpace() throws IOException {
return Runtime.getRuntime().freeMemory();
}
/**
* {@inheritDoc}
*
* @see java.nio.file.FileStore#getUnallocatedSpace()
*/
@Override
public long getUnallocatedSpace() throws IOException {
return this.getUsableSpace();
}
/**
* {@inheritDoc}
*
* @see java.nio.file.FileStore#supportsFileAttributeView(java.lang.Class)
*/
@Override
public boolean supportsFileAttributeView(final Class<? extends FileAttributeView> type) {
return BasicFileAttributeView.class.equals(type);
}
/**
* {@inheritDoc}
*
* @see java.nio.file.FileStore#supportsFileAttributeView(java.lang.String)
*/
@Override
public boolean supportsFileAttributeView(final String name) {
// Only support "basic"
return ShrinkWrapFileSystem.FILE_ATTR_VIEW_BASIC.equals(name);
}
/**
* {@inheritDoc}
*
* @see java.nio.file.FileStore#getFileStoreAttributeView(java.lang.Class)
*/
@Override
public <V extends FileStoreAttributeView> V getFileStoreAttributeView(final Class<V> type) {
return null;
}
/**
* {@inheritDoc}
*
* @see java.nio.file.FileStore#getAttribute(java.lang.String)
*/
@Override
public Object getAttribute(final String attribute) throws IOException {
throw new UnsupportedOperationException(this.getClass().getSimpleName() + " does not support attributes.");
}
/**
* {@inheritDoc}
*
* @see java.lang.Object#toString()
*/
@Override
public String toString() {
return this.getClass().getSimpleName() + " for: " + archive.toString();
}
}