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Common Base for Implementations of the ShrinkWrap Project
/*
* JBoss, Home of Professional Open Source
* Copyright 2009, 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.base;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import java.util.UUID;
import org.jboss.shrinkwrap.api.Archive;
import org.jboss.shrinkwrap.api.ArchiveEvent;
import org.jboss.shrinkwrap.api.ArchiveEventHandler;
import org.jboss.shrinkwrap.api.ArchivePath;
import org.jboss.shrinkwrap.api.ArchivePaths;
import org.jboss.shrinkwrap.api.Configuration;
import org.jboss.shrinkwrap.api.Filter;
import org.jboss.shrinkwrap.api.IllegalArchivePathException;
import org.jboss.shrinkwrap.api.IllegalOverwriteException;
import org.jboss.shrinkwrap.api.Node;
import org.jboss.shrinkwrap.api.asset.ArchiveAsset;
import org.jboss.shrinkwrap.api.asset.Asset;
import org.jboss.shrinkwrap.api.exporter.StreamExporter;
import org.jboss.shrinkwrap.impl.base.path.BasicPath;
import org.jboss.shrinkwrap.impl.base.path.PathUtil;
/**
* MemoryMapArchiveBase
*
* A base implementation for all MemoryMap archives. Thread-safe.
*
* @author John Bailey
* @author Aslak Knutsen
* @version $Revision: $
* @param
*/
public abstract class MemoryMapArchiveBase> extends ArchiveBase implements Archive {
// -------------------------------------------------------------------------------------||
// Instance Members -------------------------------------------------------------------||
// -------------------------------------------------------------------------------------||
/**
* Storage for the {@link Node}s.
*/
private final Map content = Collections.synchronizedMap(new LinkedHashMap());
/**
* Storage for the {@link ArchiveAsset}s. Used to help get access to nested archive content.
*/
private final Map nestedArchives = Collections.synchronizedMap(new LinkedHashMap());
private final List handlers = new ArrayList();
// -------------------------------------------------------------------------------------||
// Constructor ------------------------------------------------------------------------||
// -------------------------------------------------------------------------------------||
/**
* Constructor
*
* This constructor will generate a unique {@link Archive#getName()} per instance.
*
* @param configuration
* The configuration for this archive
* @throws IllegalArgumentException
* If the configuration is not specified
*/
public MemoryMapArchiveBase(final Configuration configuration) throws IllegalArgumentException {
this("Archive-" + UUID.randomUUID().toString() + ".jar", configuration);
}
/**
* Constructor
*
* This constructor will generate an {@link Archive} with the provided name.
*
* @param archiveName
* @param configuration
* The configuration for this archive
* @throws IllegalArgumentException
* If the name or configuration is not specified
*/
public MemoryMapArchiveBase(final String archiveName, final Configuration configuration)
throws IllegalArgumentException {
super(archiveName, configuration);
// Add the root node to the content
final ArchivePath rootPath = new BasicPath("/");
content.put(rootPath, new NodeImpl(rootPath));
}
// -------------------------------------------------------------------------------------||
// Required Implementations - Archive -------------------------------------------------||
// -------------------------------------------------------------------------------------||
/**
* {@inheritDoc}
*
* @see org.jboss.shrinkwrap.api.Archive#add(org.jboss.shrinkwrap.api.asset.Asset,
* org.jboss.shrinkwrap.api.ArchivePath)
*/
@Override
public T add(Asset asset, ArchivePath path) {
Validate.notNull(asset, "No asset was specified");
Validate.notNull(path, "No path was specified");
return addAsset(path, asset);
}
/**
* {@inheritDoc}
*
* @see org.jboss.shrinkwrap.api.Archive#add(org.jboss.shrinkwrap.api.Archive, java.lang.String, java.lang.Class)
*/
@Override
public T add(final Archive archive, final String path, final Class exporter) {
Validate.notNull(archive, "Archive must be specified");
Validate.notNullOrEmpty(path, "Archive Path must be specified");
Validate.notNull(exporter, "exporter must be specified");
return this.add(archive, ArchivePaths.create(path), exporter);
}
/**
* {@inheritDoc}
*
* @see org.jboss.shrinkwrap.impl.base.ArchiveBase#add(org.jboss.shrinkwrap.api.Archive,
* org.jboss.shrinkwrap.api.ArchivePath, java.lang.Class)
*/
@Override
public T add(final Archive archive, final ArchivePath path, final Class exporter) {
// Add archive asset
super.add(archive, path, exporter);
// Expected Archive Path
final ArchivePath archivePath = new BasicPath(path, archive.getName());
// Get the Asset that was just added
final Node node = get(archivePath);
// Make sure it is an ArchiveAsset
if (node.getAsset() != null && node.getAsset() instanceof ArchiveAsset) {
final ArchiveAsset archiveAsset = ArchiveAsset.class.cast(node.getAsset());
// Add asset to ArchiveAsset Map
nestedArchives.put(archivePath, archiveAsset);
}
return covariantReturn();
}
/**
* {@inheritDoc}
*
* @see org.jboss.shrinkwrap.api.Archive#addAsDirectory(org.jboss.shrinkwrap.api.ArchivePath)
*/
@Override
public T addAsDirectory(final ArchivePath path) throws IllegalArgumentException {
// Precondition check
Validate.notNull(path, "path must be specified");
// Adjust the path to remove any trailing slash
ArchivePath adjustedPath = new BasicPath(PathUtil.optionallyRemoveFollowingSlash(path.get()));
return addAsset(adjustedPath, null);
}
private T addAsset(ArchivePath path, Asset asset) {
final Asset handledAsset = invokeHandlers(path, asset);
// Disallow if we're dealing with a non-empty dir
if (contains(path)) {
if (asset != null) {
// we're adding a file
final Node node = this.get(path);
if (node.getAsset() == null) {
// Path exists as a dir, throw an exception
throw new IllegalOverwriteException("Cannot add requested asset " + asset + " to path "
+ path.get() + " to archive " + this.getName() + "; path already exists as directory");
} else {
// path exists as a file, overwrite
addNewNode(path, handledAsset);
}
}
// we're adding dir, it exists, do nothing
} else {
// Path does not exists, add new node
addNewNode(path, handledAsset);
}
return covariantReturn();
}
private void addNewNode(ArchivePath path, Asset handledAsset) {
// Add the node to the content of the archive
final NodeImpl newNode = new NodeImpl(path, handledAsset);
content.put(path, newNode);
// Add the new node to the parent as a child
final NodeImpl parentNode = obtainParent(path.getParent());
if (parentNode != null) {
parentNode.addChild(newNode);
}
}
/**
* {@inheritDoc}
* @see org.jboss.shrinkwrap.api.Archive#addListener(org.jboss.shrinkwrap.api.Filter, org.jboss.shrinkwrap.api.ArchiveEventHandler)
*/
@Override
public T addHandlers(ArchiveEventHandler... handlers) {
for (ArchiveEventHandler handler : handlers) {
this.handlers.add(handler);
}
return covariantReturn();
}
private Asset invokeHandlers(ArchivePath path, Asset asset) {
final ArchiveEvent event = new ArchiveEvent(path, asset);
for (ArchiveEventHandler handler : handlers) {
handler.handle(event);
}
return event.getHandledAsset();
}
/**
* {@inheritDoc}
*
* @see org.jboss.shrinkwrap.api.Archive#contains(org.jboss.shrinkwrap.api.ArchivePath)
*/
@Override
public boolean contains(ArchivePath path) {
Validate.notNull(path, "No path was specified");
boolean found = content.containsKey(path);
if (!found) {
found = nestedContains(path);
}
return found;
}
/**
* {@inheritDoc}
*
* @see org.jboss.shrinkwrap.api.Archive#contains(java.lang.String)
*/
@Override
public boolean contains(final String path) throws IllegalArgumentException {
Validate.notNull(path, "Path must be specified");
final ArchivePath archivePath = ArchivePaths.create(path);
return this.contains(archivePath);
}
/**
* {@inheritDoc}
*
* @see org.jboss.shrinkwrap.api.Archive#delete(org.jboss.declarchive.api.ArchivePath)
*/
@Override
public Node delete(ArchivePath path) {
Validate.notNull(path, "No path was specified");
ArchivePath safePath = path;
NodeImpl node = content.get(safePath);
if (node == null) {
if (path.get().endsWith("/")) {
safePath = ArchivePaths.create(path.get().substring(0, path.get().length() - 1));
node = content.get(safePath);
}
if (node == null) {
return null;
}
}
return removeNodeRecursively(node, safePath);
}
/**
* Removes the specified node and its associated children from the contents
* of this archive.
*
* @param node the node to remove recursively
* @param path the path denoting the specified node
* @return the removed node itself
*/
private Node removeNodeRecursively(final NodeImpl node, final ArchivePath path) {
final NodeImpl parentNode = content.get(path.getParent());
if (parentNode != null) {
parentNode.removeChild(node);
}
// Remove from nested archives if present
nestedArchives.remove(path);
// Recursively delete children if present
if (node.getChildren() != null) {
final Set children = node.getChildren();
// can't remove from collection inside of the iteration
final Set childrenCopy = new HashSet(children);
for (Node child : childrenCopy) {
node.removeChild(child);
content.remove(child.getPath());
}
}
return content.remove(path);
}
/**
* {@inheritDoc}
*
* @see org.jboss.shrinkwrap.api.Archive#delete(java.lang.String)
*/
@Override
public Node delete(String archivePath) {
Validate.notNull(archivePath, "No path was specified");
return delete(ArchivePaths.create(archivePath));
}
/**
* {@inheritDoc}
*
* @see org.jboss.shrinkwrap.api.Archive#get(org.jboss.shrinkwrap.api.ArchivePath)
*/
@Override
public Node get(ArchivePath path) {
Validate.notNull(path, "No path was specified");
Node node = content.get(path);
if (node == null && contains(path)) {
node = getNestedNode(path);
}
return node;
}
/**
* {@inheritDoc}
*
* @see org.jboss.shrinkwrap.api.Archive#getContent()
*/
@Override
public Map getContent() {
Map ret = new LinkedHashMap();
for (Map.Entry item : content.entrySet()) {
if (!item.getKey().equals(new BasicPath("/"))) {
ret.put(item.getKey(), item.getValue());
}
}
return Collections.unmodifiableMap(ret);
}
/**
* {@inheritDoc}
*
* @see org.jboss.shrinkwrap.api.Archive#getContent(org.jboss.shrinkwrap.api.Filter)
*/
@Override
public Map getContent(Filter filter) {
Validate.notNull(filter, "Filter must be specified");
Map filteredContent = new LinkedHashMap();
for (Map.Entry contentEntry : content.entrySet()) {
if (filter.include(contentEntry.getKey())) {
if (!contentEntry.getKey().equals(new BasicPath("/"))) {
filteredContent.put(contentEntry.getKey(), contentEntry.getValue());
}
}
}
return filteredContent;
}
// -------------------------------------------------------------------------------------||
// Internal Helper Methods ------------------------------------------------------------||
// -------------------------------------------------------------------------------------||
/**
* Check to see if a path is found in a nested archive
*/
private boolean nestedContains(ArchivePath path) {
// Iterate through nested archives
for (Entry nestedArchiveEntry : nestedArchives.entrySet()) {
ArchivePath archivePath = nestedArchiveEntry.getKey();
ArchiveAsset archiveAsset = nestedArchiveEntry.getValue();
// Check to see if the requested path starts with the nested archive path
if (startsWith(path, archivePath)) {
Archive nestedArchive = archiveAsset.getArchive();
// Get the asset path from within the nested archive
ArchivePath nestedAssetPath = getNestedPath(path, archivePath);
// Recurse the call to the nested archive
return nestedArchive.contains(nestedAssetPath);
}
}
return false;
}
/**
* Attempt to get the asset from a nested archive.
*
* @param path
* @return
*/
private Node getNestedNode(ArchivePath path) {
// Iterate through nested archives
for (Entry nestedArchiveEntry : nestedArchives.entrySet()) {
ArchivePath archivePath = nestedArchiveEntry.getKey();
ArchiveAsset archiveAsset = nestedArchiveEntry.getValue();
// Check to see if the requested path starts with the nested archive path
if (startsWith(path, archivePath)) {
Archive nestedArchive = archiveAsset.getArchive();
// Get the asset path from within the nested archive
ArchivePath nestedAssetPath = getNestedPath(path, archivePath);
// Recurse the call to the nested archive
return nestedArchive.get(nestedAssetPath);
}
}
return null;
}
/**
* Check to see if one path starts with another
*
* @param fullPath
* @param startingPath
* @return
*/
private boolean startsWith(ArchivePath fullPath, ArchivePath startingPath) {
final String context = fullPath.get();
final String startingContext = startingPath.get();
return context.startsWith(startingContext);
}
/**
* Given a full path and a base path return a new path containing the full path with the base path removed from the
* beginning.
*
* @param fullPath
* @param basePath
* @return
*/
private ArchivePath getNestedPath(ArchivePath fullPath, ArchivePath basePath) {
final String context = fullPath.get();
final String baseContent = basePath.get();
// Remove the base path from the full path
String nestedArchiveContext = context.substring(baseContent.length());
return new BasicPath(nestedArchiveContext);
}
/**
* Used to retrieve a {@link Node} from the content of the {@link Archive}. If the {@link Node} doesn�t exists in
* the specified location, it is created and added to the {@link Archive}. The same happens to all its non-existing
* parents. However, if the {@link Node} is an asset, an IllegalArchivePathException is thrown.
*
* @param path
* The {@link ArchivePath} from which we are obtaining the {@link Node}
* @return The {@link Node} in the specified path
* @throws IllegalArchivePathException
* if the node is an {@link Asset}
*/
private NodeImpl obtainParent(ArchivePath path) {
if (path == null) {
return null;
}
NodeImpl node = content.get(path);
// If the node exists, just return it
if (node != null) {
// if the node is an asset, throw an exception
if (node.getAsset() != null) {
throw new IllegalArchivePathException("Could not create node under " + path.getParent()
+ ". It points to an asset.");
}
return node;
}
// If the node doesn't exists, create it. Also create all possible non-existing
// parents
node = new NodeImpl(path);
NodeImpl parentNode = obtainParent(path.getParent());
if (parentNode != null) {
parentNode.addChild(node);
}
// Add the node to the contents of the archive
content.put(path, node);
return node;
}
}
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