panda.net.ftp.FTPFile Maven / Gradle / Ivy
package panda.net.ftp;
import java.io.Serializable;
import java.util.Calendar;
import java.util.Date;
import java.util.Formatter;
import java.util.TimeZone;
/***
* The FTPFile class is used to represent information about files stored on an FTP server.
*
* @see FTPFileEntryParser
* @see FTPClient#listFiles
***/
public class FTPFile implements Serializable {
private static final long serialVersionUID = 9010790363003271996L;
/** A constant indicating an FTPFile is a file. ***/
public static final int FILE_TYPE = 0;
/** A constant indicating an FTPFile is a directory. ***/
public static final int DIRECTORY_TYPE = 1;
/** A constant indicating an FTPFile is a symbolic link. ***/
public static final int SYMBOLIC_LINK_TYPE = 2;
/** A constant indicating an FTPFile is of unknown type. ***/
public static final int UNKNOWN_TYPE = 3;
/** A constant indicating user access permissions. ***/
public static final int USER_ACCESS = 0;
/** A constant indicating group access permissions. ***/
public static final int GROUP_ACCESS = 1;
/** A constant indicating world access permissions. ***/
public static final int WORLD_ACCESS = 2;
/** A constant indicating file/directory read permission. ***/
public static final int READ_PERMISSION = 0;
/** A constant indicating file/directory write permission. ***/
public static final int WRITE_PERMISSION = 1;
/**
* A constant indicating file execute permission or directory listing permission.
***/
public static final int EXECUTE_PERMISSION = 2;
private int _type, _hardLinkCount;
private long _size;
private String _rawListing, _user, _group, _name, _link;
private Calendar _date;
// If this is null, then list entry parsing failed
private final boolean[] _permissions[]; // e.g. _permissions[USER_ACCESS][READ_PERMISSION]
/*** Creates an empty FTPFile. ***/
public FTPFile() {
_permissions = new boolean[3][3];
_type = UNKNOWN_TYPE;
// init these to values that do not occur in listings
// so can distinguish which fields are unset
_hardLinkCount = 0; // 0 is invalid as a link count
_size = -1; // 0 is valid, so use -1
_user = "";
_group = "";
_date = null;
_name = null;
}
/**
* Constructor for use by {@link FTPListParseEngine} only. Used to create FTPFile entries for
* failed parses
*
* @param rawListing line that could not be parsed.
*/
FTPFile(String rawListing) {
_permissions = null; // flag that entry is invalid
_rawListing = rawListing;
_type = UNKNOWN_TYPE;
// init these to values that do not occur in listings
// so can distinguish which fields are unset
_hardLinkCount = 0; // 0 is invalid as a link count
_size = -1; // 0 is valid, so use -1
_user = "";
_group = "";
_date = null;
_name = null;
}
/***
* Set the original FTP server raw listing from which the FTPFile was created.
*
* @param rawListing The raw FTP server listing.
***/
public void setRawListing(String rawListing) {
_rawListing = rawListing;
}
/***
* Get the original FTP server raw listing used to initialize the FTPFile.
*
* @return The original FTP server raw listing used to initialize the FTPFile.
***/
public String getRawListing() {
return _rawListing;
}
/***
* Determine if the file is a directory.
*
* @return True if the file is of type DIRECTORY_TYPE, false if not.
***/
public boolean isDirectory() {
return (_type == DIRECTORY_TYPE);
}
/***
* Determine if the file is a regular file.
*
* @return True if the file is of type FILE_TYPE, false if not.
***/
public boolean isFile() {
return (_type == FILE_TYPE);
}
/***
* Determine if the file is a symbolic link.
*
* @return True if the file is of type UNKNOWN_TYPE, false if not.
***/
public boolean isSymbolicLink() {
return (_type == SYMBOLIC_LINK_TYPE);
}
/***
* Determine if the type of the file is unknown.
*
* @return True if the file is of type UNKNOWN_TYPE, false if not.
***/
public boolean isUnknown() {
return (_type == UNKNOWN_TYPE);
}
/**
* Used to indicate whether an entry is valid or not. If the entry is invalid, only the
* {@link #getRawListing()} method will be useful. Other methods may fail. Used in conjunction
* with list parsing that preseverves entries that failed to parse.
*
* @see FTPClientConfig#setUnparseableEntries(boolean)
* @return true if the entry is valid
*/
public boolean isValid() {
return (_permissions != null);
}
/***
* Set the type of the file (DIRECTORY_TYPE, FILE_TYPE, etc.).
*
* @param type The integer code representing the type of the file.
***/
public void setType(int type) {
_type = type;
}
/***
* Return the type of the file (one of the _TYPE constants), e.g., if it is a
* directory, a regular file, or a symbolic link.
*
* @return The type of the file.
***/
public int getType() {
return _type;
}
/***
* Set the name of the file.
*
* @param name The name of the file.
***/
public void setName(String name) {
_name = name;
}
/***
* Return the name of the file.
*
* @return The name of the file.
***/
public String getName() {
return _name;
}
/**
* Set the file size in bytes.
*
* @param size The file size in bytes.
*/
public void setSize(long size) {
_size = size;
}
/***
* Return the file size in bytes.
*
* @return The file size in bytes.
***/
public long getSize() {
return _size;
}
/***
* Set the number of hard links to this file. This is not to be confused with symbolic links.
*
* @param links The number of hard links to this file.
***/
public void setHardLinkCount(int links) {
_hardLinkCount = links;
}
/***
* Return the number of hard links to this file. This is not to be confused with symbolic links.
*
* @return The number of hard links to this file.
***/
public int getHardLinkCount() {
return _hardLinkCount;
}
/***
* Set the name of the group owning the file. This may be a string representation of the group
* number.
*
* @param group The name of the group owning the file.
***/
public void setGroup(String group) {
_group = group;
}
/***
* Returns the name of the group owning the file. Sometimes this will be a string representation
* of the group number.
*
* @return The name of the group owning the file.
***/
public String getGroup() {
return _group;
}
/***
* Set the name of the user owning the file. This may be a string representation of the user
* number;
*
* @param user The name of the user owning the file.
***/
public void setUser(String user) {
_user = user;
}
/***
* Returns the name of the user owning the file. Sometimes this will be a string representation
* of the user number.
*
* @return The name of the user owning the file.
***/
public String getUser() {
return _user;
}
/***
* If the FTPFile is a symbolic link, use this method to set the name of the file being pointed
* to by the symbolic link.
*
* @param link The file pointed to by the symbolic link.
***/
public void setLink(String link) {
_link = link;
}
/***
* If the FTPFile is a symbolic link, this method returns the name of the file being pointed to
* by the symbolic link. Otherwise it returns null.
*
* @return The file pointed to by the symbolic link (null if the FTPFile is not a symbolic
* link).
***/
public String getLink() {
return _link;
}
/***
* Set the file timestamp. This usually the last modification time. The parameter is not cloned,
* so do not alter its value after calling this method.
*
* @param date A Calendar instance representing the file timestamp.
***/
public void setTimestamp(Calendar date) {
_date = date;
}
/***
* Returns the file timestamp. This usually the last modification time.
*
* @return A Calendar instance representing the file timestamp.
***/
public Calendar getTimestamp() {
return _date;
}
/***
* Set if the given access group (one of the _ACCESS constants) has the given
* access permission (one of the _PERMISSION constants) to the file.
*
* @param access The access group (one of the _ACCESS constants)
* @param permission The access permission (one of the _PERMISSION constants)
* @param value True if permission is allowed, false if not.
* @throws ArrayIndexOutOfBoundsException if either of the parameters is out of range
***/
public void setPermission(int access, int permission, boolean value) {
_permissions[access][permission] = value;
}
/***
* Determines if the given access group (one of the _ACCESS constants) has the
* given access permission (one of the _PERMISSION constants) to the file.
*
* @param access The access group (one of the _ACCESS constants)
* @param permission The access permission (one of the _PERMISSION constants)
* @throws ArrayIndexOutOfBoundsException if either of the parameters is out of range
* @return true if {@link #isValid()} is {@code true &&} the associated permission is set;
* {@code false} otherwise.
***/
public boolean hasPermission(int access, int permission) {
if (_permissions == null) {
return false;
}
return _permissions[access][permission];
}
/***
* Returns a string representation of the FTPFile information.
*
* @return A string representation of the FTPFile information.
*/
@Override
public String toString() {
return getRawListing();
}
/***
* Returns a string representation of the FTPFile information. This currently mimics the Unix
* listing format. This method uses the timezone of the Calendar entry, which is the server time
* zone (if one was provided) otherwise it is the local time zone.
*
* Note: if the instance is not valid {@link #isValid()}, no useful information can be returned.
* In this case, use {@link #getRawListing()} instead.
*
* @return A string representation of the FTPFile information.
*/
public String toFormattedString() {
return toFormattedString(null);
}
/**
* Returns a string representation of the FTPFile information. This currently mimics the Unix
* listing format. This method allows the Calendar time zone to be overridden.
*
* Note: if the instance is not valid {@link #isValid()}, no useful information can be returned.
* In this case, use {@link #getRawListing()} instead.
*
* @param timezone the timezone to use for displaying the time stamp If {@code null}, then use
* the Calendar entry timezone
* @return A string representation of the FTPFile information.
*/
public String toFormattedString(final String timezone) {
if (!isValid()) {
return "[Invalid: could not parse file entry]";
}
StringBuilder sb = new StringBuilder();
Formatter fmt = new Formatter(sb);
sb.append(formatType());
sb.append(permissionToString(USER_ACCESS));
sb.append(permissionToString(GROUP_ACCESS));
sb.append(permissionToString(WORLD_ACCESS));
fmt.format(" %4d", Integer.valueOf(getHardLinkCount()));
fmt.format(" %-8s %-8s", getUser(), getGroup());
fmt.format(" %8d", Long.valueOf(getSize()));
Calendar timestamp = getTimestamp();
if (timestamp != null) {
if (timezone != null) {
TimeZone newZone = TimeZone.getTimeZone(timezone);
if (!newZone.equals(timestamp.getTimeZone())) {
Date original = timestamp.getTime();
Calendar newStamp = Calendar.getInstance(newZone);
newStamp.setTime(original);
timestamp = newStamp;
}
}
fmt.format(" %1$tY-%1$tm-%1$td", timestamp);
// Only display time units if they are present
if (timestamp.isSet(Calendar.HOUR_OF_DAY)) {
fmt.format(" %1$tH", timestamp);
if (timestamp.isSet(Calendar.MINUTE)) {
fmt.format(":%1$tM", timestamp);
if (timestamp.isSet(Calendar.SECOND)) {
fmt.format(":%1$tS", timestamp);
if (timestamp.isSet(Calendar.MILLISECOND)) {
fmt.format(".%1$tL", timestamp);
}
}
}
fmt.format(" %1$tZ", timestamp);
}
}
sb.append(' ');
sb.append(getName());
fmt.close();
return sb.toString();
}
private char formatType() {
switch (_type) {
case FILE_TYPE:
return '-';
case DIRECTORY_TYPE:
return 'd';
case SYMBOLIC_LINK_TYPE:
return 'l';
default:
return '?';
}
}
private String permissionToString(int access) {
StringBuilder sb = new StringBuilder();
if (hasPermission(access, READ_PERMISSION)) {
sb.append('r');
}
else {
sb.append('-');
}
if (hasPermission(access, WRITE_PERMISSION)) {
sb.append('w');
}
else {
sb.append('-');
}
if (hasPermission(access, EXECUTE_PERMISSION)) {
sb.append('x');
}
else {
sb.append('-');
}
return sb.toString();
}
}