org.apache.naming.resources.FileDirContext Maven / Gradle / Ivy
/*
* 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.naming.resources;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Date;
import java.util.Hashtable;
import java.util.List;
import javax.naming.NameAlreadyBoundException;
import javax.naming.NameNotFoundException;
import javax.naming.NamingEnumeration;
import javax.naming.NamingException;
import javax.naming.OperationNotSupportedException;
import javax.naming.directory.Attributes;
import javax.naming.directory.DirContext;
import javax.naming.directory.ModificationItem;
import javax.naming.directory.SearchControls;
import javax.naming.directory.SearchResult;
import org.apache.naming.NamingEntry;
import org.apache.tomcat.util.http.RequestUtil;
/**
* Filesystem Directory Context implementation helper class.
*
* @author Remy Maucherat
*/
public class FileDirContext extends BaseDirContext {
private static final org.apache.juli.logging.Log log=
org.apache.juli.logging.LogFactory.getLog( FileDirContext.class );
// -------------------------------------------------------------- Constants
/**
* The descriptive information string for this implementation.
*/
protected static final int BUFFER_SIZE = 2048;
// ----------------------------------------------------------- Constructors
/**
* Builds a file directory context using the given environment.
*/
public FileDirContext() {
super();
}
/**
* Builds a file directory context using the given environment.
*
* @param env The environment with which to build the context
*/
public FileDirContext(Hashtable env) {
super(env);
}
// ----------------------------------------------------- Instance Variables
/**
* The document base directory.
*/
protected File base = null;
/**
* Absolute normalized filename of the base.
*/
protected String absoluteBase = null;
private String canonicalBase = null;
/**
* Allow linking.
*/
protected boolean allowLinking = false;
// ------------------------------------------------------------- Properties
/**
* Set the document root.
*
* @param docBase The new document root
*
* @exception IllegalArgumentException if the specified value is not
* supported by this implementation
* @exception IllegalArgumentException if this would create a
* malformed URL
*/
@Override
public void setDocBase(String docBase) {
// Validate the format of the proposed document root
if (docBase == null) {
throw new IllegalArgumentException(sm.getString("resources.null"));
}
// Calculate a File object referencing this document base directory
base = new File(docBase);
try {
base = base.getCanonicalFile();
} catch (IOException e) {
// Ignore
}
// Validate that the document base is an existing directory
if (!base.exists() || !base.isDirectory() || !base.canRead()) {
throw new IllegalArgumentException(sm.getString("fileResources.base", docBase));
}
this.absoluteBase = normalize(base.getAbsolutePath());
// absoluteBase also needs to be normalized. Using the canonical path is
// the simplest way of doing this.
try {
this.canonicalBase = base.getCanonicalPath();
} catch (IOException e) {
throw new IllegalArgumentException(e);
}
super.setDocBase(docBase);
}
/**
* Set allow linking.
*
* @param allowLinking The new value for the attribute
*/
public void setAllowLinking(boolean allowLinking) {
this.allowLinking = allowLinking;
}
/**
* Is linking allowed.
*
* @return {@code true} is linking is allowed, otherwise {@code false}
*/
public boolean getAllowLinking() {
return allowLinking;
}
// --------------------------------------------------------- Public Methods
/**
* Release any resources allocated for this directory context.
*/
@Override
public void release() {
super.release();
}
/**
* Return the real path for a given virtual path, if possible; otherwise
* return null.
*
* @param path The path to the desired resource
*/
@Override
protected String doGetRealPath(String path) {
File file = new File(getDocBase(), path);
return file.getAbsolutePath();
}
// -------------------------------------------------------- Context Methods
/**
* Retrieves the named object.
*
* @param name the name of the object to look up
* @return the object bound to name
*/
@Override
protected Object doLookup(String name) {
Object result = null;
File file = file(name, true);
if (file == null)
return null;
if (file.isDirectory()) {
FileDirContext tempContext = new FileDirContext(env);
tempContext.setDocBase(file.getPath());
tempContext.setAllowLinking(getAllowLinking());
result = tempContext;
} else {
result = new FileResource(file);
}
return result;
}
/**
* Unbinds the named object. Removes the terminal atomic name in name
* from the target context--that named by all but the terminal atomic
* part of name.
*
* This method is idempotent. It succeeds even if the terminal atomic
* name is not bound in the target context, but throws
* NameNotFoundException if any of the intermediate contexts do not exist.
*
* @param name the name to bind; may not be empty
* @exception NameNotFoundException if an intermediate context does not
* exist
* @exception NamingException if a naming exception is encountered
*/
@Override
public void unbind(String name)
throws NamingException {
File file = file(name, true);
if (file == null)
throw new NameNotFoundException(
sm.getString("resources.notFound", name));
if (!file.delete())
throw new NamingException
(sm.getString("resources.unbindFailed", name));
}
/**
* Binds a new name to the object bound to an old name, and unbinds the
* old name. Both names are relative to this context. Any attributes
* associated with the old name become associated with the new name.
* Intermediate contexts of the old name are not changed.
*
* @param oldName the name of the existing binding; may not be empty
* @param newName the name of the new binding; may not be empty
* @exception NameAlreadyBoundException if newName is already bound
* @exception NamingException if a naming exception is encountered
*/
@Override
public void rename(String oldName, String newName) throws NamingException {
File file = file(oldName, true);
if (file == null) {
throw new NameNotFoundException(sm.getString("resources.notFound", oldName));
}
File newFile = file(newName, false);
if (newFile == null) {
throw new NamingException(sm.getString("resources.renameFail", oldName, newName));
}
if (!file.renameTo(newFile)) {
throw new NamingException(sm.getString("resources.renameFail", oldName, newName));
}
}
/**
* Enumerates the names bound in the named context, along with the
* objects bound to them. The contents of any subcontexts are not
* included.
*
* If a binding is added to or removed from this context, its effect on
* an enumeration previously returned is undefined.
*
* @param name the name of the context to list
* @return an enumeration of the bindings in this context.
* Each element of the enumeration is of type Binding.
* @exception NamingException if a naming exception is encountered
*/
@Override
protected List doListBindings(String name)
throws NamingException {
File file = file(name, true);
if (file == null)
return null;
return list(file);
}
/**
* Destroys the named context and removes it from the namespace. Any
* attributes associated with the name are also removed. Intermediate
* contexts are not destroyed.
*
* This method is idempotent. It succeeds even if the terminal atomic
* name is not bound in the target context, but throws
* NameNotFoundException if any of the intermediate contexts do not exist.
*
* In a federated naming system, a context from one naming system may be
* bound to a name in another. One can subsequently look up and perform
* operations on the foreign context using a composite name. However, an
* attempt destroy the context using this composite name will fail with
* NotContextException, because the foreign context is not a "subcontext"
* of the context in which it is bound. Instead, use unbind() to remove
* the binding of the foreign context. Destroying the foreign context
* requires that the destroySubcontext() be performed on a context from
* the foreign context's "native" naming system.
*
* @param name the name of the context to be destroyed; may not be empty
* @exception NameNotFoundException if an intermediate context does not
* exist
* @exception javax.naming.NotContextException if the name is bound but does
* not name a context, or does not name a context of the appropriate type
*/
@Override
public void destroySubcontext(String name)
throws NamingException {
unbind(name);
}
/**
* Retrieves the named object, following links except for the terminal
* atomic component of the name. If the object bound to name is not a
* link, returns the object itself.
*
* @param name the name of the object to look up
* @return the object bound to name, not following the terminal link
* (if any).
* @exception NamingException if a naming exception is encountered
*/
@Override
public Object lookupLink(String name)
throws NamingException {
// Note : Links are not supported
return lookup(name);
}
/**
* Retrieves the full name of this context within its own namespace.
*
* Many naming services have a notion of a "full name" for objects in
* their respective namespaces. For example, an LDAP entry has a
* distinguished name, and a DNS record has a fully qualified name. This
* method allows the client application to retrieve this name. The string
* returned by this method is not a JNDI composite name and should not be
* passed directly to context methods. In naming systems for which the
* notion of full name does not make sense,
* OperationNotSupportedException is thrown.
*
* @return this context's name in its own namespace; never null
* @exception OperationNotSupportedException if the naming system does
* not have the notion of a full name
* @exception NamingException if a naming exception is encountered
*/
@Override
public String getNameInNamespace()
throws NamingException {
return docBase;
}
// ----------------------------------------------------- DirContext Methods
/**
* Retrieves selected attributes associated with a named object.
* See the class description regarding attribute models, attribute type
* names, and operational attributes.
*
* @return the requested attributes; never null
* @param name the name of the object from which to retrieve attributes
* @param attrIds the identifiers of the attributes to retrieve. null
* indicates that all attributes should be retrieved; an empty array
* indicates that none should be retrieved
* @exception NamingException if a naming exception is encountered
*/
@Override
protected Attributes doGetAttributes(String name, String[] attrIds)
throws NamingException {
// Building attribute list
File file = file(name, true);
if (file == null)
return null;
return new FileResourceAttributes(file);
}
/**
* Modifies the attributes associated with a named object. The order of
* the modifications is not specified. Where possible, the modifications
* are performed atomically.
*
* @param name the name of the object whose attributes will be updated
* @param mod_op the modification operation, one of: ADD_ATTRIBUTE,
* REPLACE_ATTRIBUTE, REMOVE_ATTRIBUTE
* @param attrs the attributes to be used for the modification; may not
* be null
* @exception javax.naming.directory.AttributeModificationException if the
* modification cannot be completed successfully
* @exception NamingException if a naming exception is encountered
*/
@Override
public void modifyAttributes(String name, int mod_op, Attributes attrs)
throws NamingException {
throw new OperationNotSupportedException();
}
/**
* Modifies the attributes associated with a named object using an an
* ordered list of modifications. The modifications are performed in the
* order specified. Each modification specifies a modification operation
* code and an attribute on which to operate. Where possible, the
* modifications are performed atomically.
*
* @param name the name of the object whose attributes will be updated
* @param mods an ordered sequence of modifications to be performed; may
* not be null
* @exception javax.naming.directory.AttributeModificationException if the
* modification cannot be completed successfully
* @exception NamingException if a naming exception is encountered
*/
@Override
public void modifyAttributes(String name, ModificationItem[] mods)
throws NamingException {
throw new OperationNotSupportedException();
}
/**
* Binds a name to an object, along with associated attributes. If attrs
* is null, the resulting binding will have the attributes associated
* with obj if obj is a DirContext, and no attributes otherwise. If attrs
* is non-null, the resulting binding will have attrs as its attributes;
* any attributes associated with obj are ignored.
*
* @param name the name to bind; may not be empty
* @param obj the object to bind; possibly null
* @param attrs the attributes to associate with the binding
* @exception NameAlreadyBoundException if name is already bound
* @exception javax.naming.directory.InvalidAttributesException if some
* "mandatory" attributes of the binding are not supplied
* @exception NamingException if a naming exception is encountered
*/
@Override
public void bind(String name, Object obj, Attributes attrs) throws NamingException {
// Note: No custom attributes allowed
// bind() is meant to create a file so ensure that the path doesn't end
// in '/'
if (name.endsWith("/")) {
throw new NamingException(sm.getString("resources.bindFailed", name));
}
File file = file(name, false);
if (file == null) {
throw new NamingException(sm.getString("resources.bindFailed", name));
}
if (file.exists())
throw new NameAlreadyBoundException
(sm.getString("resources.alreadyBound", name));
rebind(name, obj, attrs);
}
/**
* Binds a name to an object, along with associated attributes,
* overwriting any existing binding. If attrs is null and obj is a
* DirContext, the attributes from obj are used. If attrs is null and obj
* is not a DirContext, any existing attributes associated with the object
* already bound in the directory remain unchanged. If attrs is non-null,
* any existing attributes associated with the object already bound in
* the directory are removed and attrs is associated with the named
* object. If obj is a DirContext and attrs is non-null, the attributes
* of obj are ignored.
*
* @param name the name to bind; may not be empty
* @param obj the object to bind; possibly null
* @param attrs the attributes to associate with the binding
* @exception javax.naming.directory.InvalidAttributesException if some
* "mandatory" attributes of the binding are not supplied
* @exception NamingException if a naming exception is encountered
*/
@Override
public void rebind(String name, Object obj, Attributes attrs)
throws NamingException {
// Note: No custom attributes allowed
// Check obj type
File file = file(name, false);
if (file == null) {
throw new NamingException(sm.getString("resources.bindFailed", name));
}
InputStream is = null;
if (obj instanceof Resource) {
try {
is = ((Resource) obj).streamContent();
} catch (IOException e) {
// Ignore
}
} else if (obj instanceof InputStream) {
is = (InputStream) obj;
} else if (obj instanceof DirContext) {
if (file.exists()) {
if (!file.delete())
throw new NamingException
(sm.getString("resources.bindFailed", name));
}
if (!file.mkdir())
throw new NamingException
(sm.getString("resources.bindFailed", name));
}
if (is == null)
throw new NamingException
(sm.getString("resources.bindFailed", name));
// Open os
FileOutputStream os = null;
byte buffer[] = new byte[BUFFER_SIZE];
int len = -1;
try {
os = new FileOutputStream(file);
while (true) {
len = is.read(buffer);
if (len == -1)
break;
os.write(buffer, 0, len);
}
} catch (IOException e) {
NamingException ne = new NamingException
(sm.getString("resources.bindFailed", e));
ne.initCause(e);
throw ne;
} finally {
if (os != null) {
try {
os.close();
} catch (IOException e) {
}
}
try {
is.close();
} catch (IOException e) {
}
}
}
/**
* Creates and binds a new context, along with associated attributes.
* This method creates a new subcontext with the given name, binds it in
* the target context (that named by all but terminal atomic component of
* the name), and associates the supplied attributes with the newly
* created object. All intermediate and target contexts must already
* exist. If attrs is null, this method is equivalent to
* Context.createSubcontext().
*
* @param name the name of the context to create; may not be empty
* @param attrs the attributes to associate with the newly created context
* @return the newly created context
* @exception NameAlreadyBoundException if the name is already bound
* @exception javax.naming.directory.InvalidAttributesException if attrs
* does not contain all the mandatory attributes required for creation
* @exception NamingException if a naming exception is encountered
*/
@Override
public DirContext createSubcontext(String name, Attributes attrs)
throws NamingException {
File file = file(name, false);
if (file == null) {
throw new NamingException(sm.getString("resources.bindFailed", name));
}
if (file.exists())
throw new NameAlreadyBoundException(sm.getString("resources.alreadyBound", name));
if (!file.mkdir())
throw new NamingException(sm.getString("resources.bindFailed", name));
return (DirContext) lookup(name);
}
/**
* Retrieves the schema associated with the named object. The schema
* describes rules regarding the structure of the namespace and the
* attributes stored within it. The schema specifies what types of
* objects can be added to the directory and where they can be added;
* what mandatory and optional attributes an object can have. The range
* of support for schemas is directory-specific.
*
* @param name the name of the object whose schema is to be retrieved
* @return the schema associated with the context; never null
* @exception OperationNotSupportedException if schema not supported
* @exception NamingException if a naming exception is encountered
*/
@Override
public DirContext getSchema(String name)
throws NamingException {
throw new OperationNotSupportedException();
}
/**
* Retrieves a context containing the schema objects of the named
* object's class definitions.
*
* @param name the name of the object whose object class definition is to
* be retrieved
* @return the DirContext containing the named object's class
* definitions; never null
* @exception OperationNotSupportedException if schema not supported
* @exception NamingException if a naming exception is encountered
*/
@Override
public DirContext getSchemaClassDefinition(String name)
throws NamingException {
throw new OperationNotSupportedException();
}
/**
* Searches in a single context for objects that contain a specified set
* of attributes, and retrieves selected attributes. The search is
* performed using the default SearchControls settings.
*
* @param name the name of the context to search
* @param matchingAttributes the attributes to search for. If empty or
* null, all objects in the target context are returned.
* @param attributesToReturn the attributes to return. null indicates
* that all attributes are to be returned; an empty array indicates that
* none are to be returned.
* @return a non-null enumeration of SearchResult objects. Each
* SearchResult contains the attributes identified by attributesToReturn
* and the name of the corresponding object, named relative to the
* context named by name.
* @exception NamingException if a naming exception is encountered
*/
@Override
public NamingEnumeration search(String name,
Attributes matchingAttributes, String[] attributesToReturn)
throws NamingException {
return null;
}
/**
* Searches in a single context for objects that contain a specified set
* of attributes. This method returns all the attributes of such objects.
* It is equivalent to supplying null as the atributesToReturn parameter
* to the method search(Name, Attributes, String[]).
*
* @param name the name of the context to search
* @param matchingAttributes the attributes to search for. If empty or
* null, all objects in the target context are returned.
* @return a non-null enumeration of SearchResult objects. Each
* SearchResult contains the attributes identified by attributesToReturn
* and the name of the corresponding object, named relative to the
* context named by name.
* @exception NamingException if a naming exception is encountered
*/
@Override
public NamingEnumeration search(String name,
Attributes matchingAttributes) throws NamingException {
return null;
}
/**
* Searches in the named context or object for entries that satisfy the
* given search filter. Performs the search as specified by the search
* controls.
*
* @param name the name of the context or object to search
* @param filter the filter expression to use for the search; may not be
* null
* @param cons the search controls that control the search. If null,
* the default search controls are used (equivalent to
* (new SearchControls())).
* @return an enumeration of SearchResults of the objects that satisfy
* the filter; never null
* @exception javax.naming.directory.InvalidSearchFilterException if the
* search filter specified is not supported or understood by the underlying
* directory
* @exception javax.naming.directory.InvalidSearchControlsException if the
* search controls contain invalid settings
* @exception NamingException if a naming exception is encountered
*/
@Override
public NamingEnumeration search(String name, String filter,
SearchControls cons)
throws NamingException {
return null;
}
/**
* Searches in the named context or object for entries that satisfy the
* given search filter. Performs the search as specified by the search
* controls.
*
* @param name the name of the context or object to search
* @param filterExpr the filter expression to use for the search.
* The expression may contain variables of the form "{i}" where i is a
* nonnegative integer. May not be null.
* @param filterArgs the array of arguments to substitute for the
* variables in filterExpr. The value of filterArgs[i] will replace each
* occurrence of "{i}". If null, equivalent to an empty array.
* @param cons the search controls that control the search. If null, the
* default search controls are used (equivalent to (new SearchControls())).
* @return an enumeration of SearchResults of the objects that satisfy the
* filter; never null
* @exception ArrayIndexOutOfBoundsException if filterExpr contains {i}
* expressions where i is outside the bounds of the array filterArgs
* @exception javax.naming.directory.InvalidSearchControlsException if cons
* contains invalid settings
* @exception javax.naming.directory.InvalidSearchFilterException if
* filterExpr with filterArgs represents an invalid search filter
* @exception NamingException if a naming exception is encountered
*/
@Override
public NamingEnumeration search(String name,
String filterExpr, Object[] filterArgs, SearchControls cons)
throws NamingException {
return null;
}
// ------------------------------------------------------ Protected Methods
/**
* Return a context-relative path, beginning with a "/", that represents
* the canonical version of the specified path after ".." and "." elements
* are resolved out. If the specified path attempts to go outside the
* boundaries of the current context (i.e. too many ".." path elements
* are present), return null instead.
*
* @param path Path to be normalized
*/
protected String normalize(String path) {
return RequestUtil.normalize(path, File.separatorChar == '\\');
}
/**
* Return a File object representing the specified normalized
* context-relative path if it exists and is readable. Otherwise,
* return null.
*
* @param name Normalized context-relative path (with leading '/')
*/
protected File file(String name) {
return file(name, true);
}
/**
* Return a File object representing the specified normalized
* context-relative path if it exists and is readable. Otherwise,
* return null.
*
* @param name Normalized context-relative path (with leading '/')
* @param mustExist Must the specified resource exist?
*/
protected File file(String name, boolean mustExist) {
if (name.equals("/")) {
name = "";
}
File file = new File(base, name);
return validate(file, name, mustExist, absoluteBase, canonicalBase);
}
protected File validate(File file, String name, boolean mustExist, String absoluteBase,
String canonicalBase) {
// If the requested names ends in '/', the Java File API will return a
// matching file if one exists. This isn't what we want as it is not
// consistent with the Servlet spec rules for request mapping.
if (name.endsWith("/") && file.isFile()) {
return null;
}
// If the file/dir must exist but the identified file/dir can't be read
// then signal that the resource was not found
if (mustExist && !file.canRead()) {
return null;
}
// If allow linking is enabled, files are not limited to being located
// under the fileBase so all further checks are disabled.
if (allowLinking) {
return file;
}
// Additional Windows specific checks to handle known problems with
// File.getCanonicalPath()
if (JrePlatform.IS_WINDOWS && isInvalidWindowsFilename(name)) {
return null;
}
// Check that this file is located under the web application root
String canPath = null;
try {
canPath = file.getCanonicalPath();
} catch (IOException e) {
// Ignore
}
if (canPath == null || !canPath.startsWith(canonicalBase)) {
return null;
}
// Ensure that the file is not outside the fileBase. This should not be
// possible for standard requests (the request is normalized early in
// the request processing) but might be possible for some access via the
// Servlet API (RequestDispatcher etc.) therefore these checks are
// retained as an additional safety measure. absoluteBase has been
// normalized so absPath needs to be normalized as well.
String absPath = normalize(file.getAbsolutePath());
if ((absoluteBase.length() > absPath.length())) {
return null;
}
// Remove the fileBase location from the start of the paths since that
// was not part of the requested path and the remaining check only
// applies to the request path
absPath = absPath.substring(absoluteBase.length());
canPath = canPath.substring(canonicalBase.length());
// Case sensitivity check
// The normalized requested path should be an exact match the equivalent
// canonical path. If it is not, possible reasons include:
// - case differences on case insensitive file systems
// - Windows removing a trailing ' ' or '.' from the file name
//
// In all cases, a mis-match here results in the resource not being
// found
//
// absPath is normalized so canPath needs to be normalized as well
// Can't normalize canPath earlier as canonicalBase is not normalized
if (canPath.length() > 0) {
canPath = normalize(canPath);
}
if (!canPath.equals(absPath)) {
return null;
}
return file;
}
private boolean isInvalidWindowsFilename(String name) {
final int len = name.length();
if (len == 0) {
return false;
}
// This consistently ~10 times faster than the equivalent regular
// expression irrespective of input length.
for (int i = 0; i < len; i++) {
char c = name.charAt(i);
if (c == '\"' || c == '<' || c == '>') {
// These characters are disallowed in Windows file names and
// there are known problems for file names with these characters
// when using File#getCanonicalPath().
// Note: There are additional characters that are disallowed in
// Windows file names but these are not known to cause
// problems when using File#getCanonicalPath().
return true;
}
}
// Windows does not allow file names to end in ' ' unless specific low
// level APIs are used to create the files that bypass various checks.
// File names that end in ' ' are known to cause problems when using
// File#getCanonicalPath().
if (name.charAt(len -1) == ' ') {
return true;
}
return false;
}
/**
* List the resources which are members of a collection.
*
* @param file Collection
* @return Vector containing NamingEntry objects
*/
protected List list(File file) {
List entries = new ArrayList();
if (!file.isDirectory())
return entries;
String[] names = file.list();
if (names==null) {
/* Some IO error occurred such as bad file permissions.
Prevent a NPE with Arrays.sort(names) */
log.warn(sm.getString("fileResources.listingNull",
file.getAbsolutePath()));
return entries;
}
Arrays.sort(names); // Sort alphabetically
NamingEntry entry = null;
for (int i = 0; i < names.length; i++) {
File currentFile = new File(file, names[i]);
Object object = null;
if (currentFile.isDirectory()) {
FileDirContext tempContext = new FileDirContext(env);
tempContext.setDocBase(currentFile.getPath());
tempContext.setAllowLinking(getAllowLinking());
object = tempContext;
} else {
object = new FileResource(currentFile);
}
entry = new NamingEntry(names[i], object, NamingEntry.ENTRY);
entries.add(entry);
}
return entries;
}
// ----------------------------------------------- FileResource Inner Class
/**
* This specialized resource implementation avoids opening the InputStream
* to the file right away (which would put a lock on the file).
*/
protected static class FileResource extends Resource {
// -------------------------------------------------------- Constructor
public FileResource(File file) {
this.file = file;
}
// --------------------------------------------------- Member Variables
/**
* Associated file object.
*/
protected File file;
// --------------------------------------------------- Resource Methods
/**
* Content accessor.
*
* @return InputStream
*/
@Override
public InputStream streamContent()
throws IOException {
if (binaryContent == null) {
FileInputStream fis = new FileInputStream(file);
inputStream = fis;
return fis;
}
return super.streamContent();
}
}
// ------------------------------------- FileResourceAttributes Inner Class
/**
* This specialized resource attribute implementation does some lazy
* reading (to speed up simple checks, like checking the last modified
* date).
*/
protected static class FileResourceAttributes extends ResourceAttributes {
private static final long serialVersionUID = 1L;
// -------------------------------------------------------- Constructor
public FileResourceAttributes(File file) {
this.file = file;
getCreation();
getLastModified();
}
// --------------------------------------------------- Member Variables
protected File file;
protected boolean accessed = false;
protected String canonicalPath = null;
// ----------------------------------------- ResourceAttributes Methods
/**
* Is collection.
*/
@Override
public boolean isCollection() {
if (!accessed) {
collection = file.isDirectory();
accessed = true;
}
return super.isCollection();
}
/**
* Get content length.
*
* @return content length value
*/
@Override
public long getContentLength() {
if (contentLength != -1L)
return contentLength;
contentLength = file.length();
return contentLength;
}
/**
* Get creation time.
*
* @return creation time value
*/
@Override
public long getCreation() {
if (creation != -1L)
return creation;
creation = getLastModified();
return creation;
}
/**
* Get creation date.
*
* @return Creation date value
*/
@Override
public Date getCreationDate() {
if (creation == -1L) {
creation = getCreation();
}
return super.getCreationDate();
}
/**
* Get last modified time.
*
* @return lastModified time value
*/
@Override
public long getLastModified() {
if (lastModified != -1L)
return lastModified;
lastModified = file.lastModified();
return lastModified;
}
/**
* Get lastModified date.
*
* @return LastModified date value
*/
@Override
public Date getLastModifiedDate() {
if (lastModified == -1L) {
lastModified = getLastModified();
}
return super.getLastModifiedDate();
}
/**
* Get name.
*
* @return Name value
*/
@Override
public String getName() {
if (name == null)
name = file.getName();
return name;
}
/**
* Get resource type.
*
* @return String resource type
*/
@Override
public String getResourceType() {
if (!accessed) {
collection = file.isDirectory();
accessed = true;
}
return super.getResourceType();
}
/**
* Get canonical path.
*
* @return String the file's canonical path
*/
@Override
public String getCanonicalPath() {
if (canonicalPath == null) {
try {
canonicalPath = file.getCanonicalPath();
} catch (IOException e) {
// Ignore
}
}
return canonicalPath;
}
}
}