JDK14/Java14源码在线阅读
/*
* Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
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* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
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* 2 along with this work; if not, write to the Free Software Foundation,
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*
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package javax.naming.ldap;
import javax.naming.Name;
import javax.naming.InvalidNameException;
import java.util.Enumeration;
import java.util.Collection;
import java.util.ArrayList;
import java.util.List;
import java.util.Iterator;
import java.util.ListIterator;
import java.util.Collections;
import java.io.ObjectOutputStream;
import java.io.ObjectInputStream;
import java.io.IOException;
/**
* This class represents a distinguished name as specified by
* <a href="http://www.ietf.org/rfc/rfc2253.txt">RFC 2253</a>.
* A distinguished name, or DN, is composed of an ordered list of
* components called <em>relative distinguished name</em>s, or RDNs.
* Details of a DN's syntax are described in RFC 2253.
*<p>
* This class resolves a few ambiguities found in RFC 2253
* as follows:
* <ul>
* <li> RFC 2253 leaves the term "whitespace" undefined. The
* ASCII space character 0x20 (" ") is used in its place.
* <li> Whitespace is allowed on either side of ',', ';', '=', and '+'.
* Such whitespace is accepted but not generated by this code,
* and is ignored when comparing names.
* <li> AttributeValue strings containing '=' or non-leading '#'
* characters (unescaped) are accepted.
* </ul>
*<p>
* String names passed to {@code LdapName} or returned by it
* use the full Unicode character set. They may also contain
* characters encoded into UTF-8 with each octet represented by a
* three-character substring such as "\\B4".
* They may not, however, contain characters encoded into UTF-8 with
* each octet represented by a single character in the string: the
* meaning would be ambiguous.
*<p>
* {@code LdapName} will properly parse all valid names, but
* does not attempt to detect all possible violations when parsing
* invalid names. It is "generous" in accepting invalid names.
* The "validity" of a name is determined ultimately when it
* is supplied to an LDAP server, which may accept or
* reject the name based on factors such as its schema information
* and interoperability considerations.
*<p>
* When names are tested for equality, attribute types, both binary
* and string values, are case-insensitive.
* String values with different but equivalent usage of quoting,
* escaping, or UTF8-hex-encoding are considered equal. The order of
* components in multi-valued RDNs (such as "ou=Sales+cn=Bob") is not
* significant.
* <p>
* The components of a LDAP name, that is, RDNs, are numbered. The
* indexes of a LDAP name with n RDNs range from 0 to n-1.
* This range may be written as [0,n).
* The right most RDN is at index 0, and the left most RDN is at
* index n-1. For example, the distinguished name:
* "CN=Steve Kille, O=Isode Limited, C=GB" is numbered in the following
* sequence ranging from 0 to 2: {C=GB, O=Isode Limited, CN=Steve Kille}. An
* empty LDAP name is represented by an empty RDN list.
*<p>
* Concurrent multithreaded read-only access of an instance of
* {@code LdapName} need not be synchronized.
*<p>
* Unless otherwise noted, the behavior of passing a null argument
* to a constructor or method in this class will cause a
* NullPointerException to be thrown.
*
* @author Scott Seligman
* @since 1.5
*/
public class LdapName implements Name {
private transient List<Rdn> rdns; // parsed name components
private transient String unparsed; // if non-null, the DN in unparsed form
private static final long serialVersionUID = -1595520034788997356L;
/**
* Constructs an LDAP name from the given distinguished name.
*
* @param name This is a non-null distinguished name formatted
* according to the rules defined in
* <a href="http://www.ietf.org/rfc/rfc2253.txt">RFC 2253</a>.
*
* @throws InvalidNameException if a syntax violation is detected.
* @see Rdn#escapeValue(Object value)
*/
public LdapName(String name) throws InvalidNameException {
unparsed = name;
parse();
}
/**
* Constructs an LDAP name given its parsed RDN components.
* <p>
* The indexing of RDNs in the list follows the numbering of
* RDNs described in the class description.
*
* @param rdns The non-null list of {@code Rdn}s forming this LDAP name.
*/
public LdapName(List<Rdn> rdns) {
// if (rdns instanceof ArrayList<Rdn>) {
// this.rdns = rdns.clone();
// } else if (rdns instanceof List<Rdn>) {
// this.rdns = new ArrayList<Rdn>(rdns);
// } else {
// throw IllegalArgumentException(
// "Invalid entries, list entries must be of type Rdn");
// }
this.rdns = new ArrayList<>(rdns.size());
for (int i = 0; i < rdns.size(); i++) {
Object obj = rdns.get(i);
if (!(obj instanceof Rdn)) {
throw new IllegalArgumentException("Entry:" + obj +
" not a valid type;list entries must be of type Rdn");
}
this.rdns.add((Rdn)obj);
}
}
/*
* Constructs an LDAP name given its parsed components (the elements
* of "rdns" in the range [beg,end)) and, optionally
* (if "name" is not null), the unparsed DN.
*
*/
private LdapName(String name, List<Rdn> rdns, int beg, int end) {
unparsed = name;
// this.rdns = rdns.subList(beg, end);
List<Rdn> sList = rdns.subList(beg, end);
this.rdns = new ArrayList<>(sList);
}
/**
* Retrieves the number of components in this LDAP name.
* @return The non-negative number of components in this LDAP name.
*/
public int size() {
return rdns.size();
}
/**
* Determines whether this LDAP name is empty.
* An empty name is one with zero components.
* @return true if this LDAP name is empty, false otherwise.
*/
public boolean isEmpty() {
return rdns.isEmpty();
}
/**
* Retrieves the components of this name as an enumeration
* of strings. The effect of updates to this name on this enumeration
* is undefined. If the name has zero components, an empty (non-null)
* enumeration is returned.
* The order of the components returned by the enumeration is same as
* the order in which the components are numbered as described in the
* class description.
*
* @return A non-null enumeration of the components of this LDAP name.
* Each element of the enumeration is of class String.
*/
public Enumeration<String> getAll() {
final Iterator<Rdn> iter = rdns.iterator();
return new Enumeration<String>() {
public boolean hasMoreElements() {
return iter.hasNext();
}
public String nextElement() {
return iter.next().toString();
}
};
}
/**
* Retrieves a component of this LDAP name as a string.
* @param posn The 0-based index of the component to retrieve.
* Must be in the range [0,size()).
* @return The non-null component at index posn.
* @exception IndexOutOfBoundsException if posn is outside the
* specified range.
*/
public String get(int posn) {
return rdns.get(posn).toString();
}
/**
* Retrieves an RDN of this LDAP name as an Rdn.
* @param posn The 0-based index of the RDN to retrieve.
* Must be in the range [0,size()).
* @return The non-null RDN at index posn.
* @exception IndexOutOfBoundsException if posn is outside the
* specified range.
*/
public Rdn getRdn(int posn) {
return rdns.get(posn);
}
/**
* Creates a name whose components consist of a prefix of the
* components of this LDAP name.
* Subsequent changes to this name will not affect the name
* that is returned and vice versa.
* @param posn The 0-based index of the component at which to stop.
* Must be in the range [0,size()].
* @return An instance of {@code LdapName} consisting of the
* components at indexes in the range [0,posn).
* If posn is zero, an empty LDAP name is returned.
* @exception IndexOutOfBoundsException
* If posn is outside the specified range.
*/
public Name getPrefix(int posn) {
try {
return new LdapName(null, rdns, 0, posn);
} catch (IllegalArgumentException e) {
throw new IndexOutOfBoundsException(
"Posn: " + posn + ", Size: "+ rdns.size());
}
}
/**
* Creates a name whose components consist of a suffix of the
* components in this LDAP name.
* Subsequent changes to this name do not affect the name that is
* returned and vice versa.
*
* @param posn The 0-based index of the component at which to start.
* Must be in the range [0,size()].
* @return An instance of {@code LdapName} consisting of the
* components at indexes in the range [posn,size()).
* If posn is equal to size(), an empty LDAP name is
* returned.
* @exception IndexOutOfBoundsException
* If posn is outside the specified range.
*/
public Name getSuffix(int posn) {
try {
return new LdapName(null, rdns, posn, rdns.size());
} catch (IllegalArgumentException e) {
throw new IndexOutOfBoundsException(
"Posn: " + posn + ", Size: "+ rdns.size());
}
}
/**
* Determines whether this LDAP name starts with a specified LDAP name
* prefix.
* A name {@code n} is a prefix if it is equal to
* {@code getPrefix(n.size())}--in other words this LDAP
* name starts with 'n'. If n is null or not a RFC2253 formatted name
* as described in the class description, false is returned.
*
* @param n The LDAP name to check.
* @return true if {@code n} is a prefix of this LDAP name,
* false otherwise.
* @see #getPrefix(int posn)
*/
public boolean startsWith(Name n) {
if (n == null) {
return false;
}
int len1 = rdns.size();
int len2 = n.size();
return (len1 >= len2 &&
matches(0, len2, n));
}
/**
* Determines whether the specified RDN sequence forms a prefix of this
* LDAP name. Returns true if this LdapName is at least as long as rdns,
* and for every position p in the range [0, rdns.size()) the component
* getRdn(p) matches rdns.get(p). Returns false otherwise. If rdns is
* null, false is returned.
*
* @param rdns The sequence of {@code Rdn}s to check.
* @return true if {@code rdns} form a prefix of this LDAP name,
* false otherwise.
*/
public boolean startsWith(List<Rdn> rdns) {
if (rdns == null) {
return false;
}
int len1 = this.rdns.size();
int len2 = rdns.size();
return (len1 >= len2 &&
doesListMatch(0, len2, rdns));
}
/**
* Determines whether this LDAP name ends with a specified
* LDAP name suffix.
* A name {@code n} is a suffix if it is equal to
* {@code getSuffix(size()-n.size())}--in other words this LDAP
* name ends with 'n'. If n is null or not a RFC2253 formatted name
* as described in the class description, false is returned.
*
* @param n The LDAP name to check.
* @return true if {@code n} is a suffix of this name, false otherwise.
* @see #getSuffix(int posn)
*/
public boolean endsWith(Name n) {
if (n == null) {
return false;
}
int len1 = rdns.size();
int len2 = n.size();
return (len1 >= len2 &&
matches(len1 - len2, len1, n));
}
/**
* Determines whether the specified RDN sequence forms a suffix of this
* LDAP name. Returns true if this LdapName is at least as long as rdns,
* and for every position p in the range [size() - rdns.size(), size())
* the component getRdn(p) matches rdns.get(p). Returns false otherwise.
* If rdns is null, false is returned.
*
* @param rdns The sequence of {@code Rdn}s to check.
* @return true if {@code rdns} form a suffix of this LDAP name,
* false otherwise.
*/
public boolean endsWith(List<Rdn> rdns) {
if (rdns == null) {
return false;
}
int len1 = this.rdns.size();
int len2 = rdns.size();
return (len1 >= len2 &&
doesListMatch(len1 - len2, len1, rdns));
}
private boolean doesListMatch(int beg, int end, List<Rdn> rdns) {
for (int i = beg; i < end; i++) {
if (!this.rdns.get(i).equals(rdns.get(i - beg))) {
return false;
}
}
return true;
}
/*
* Helper method for startsWith() and endsWith().
* Returns true if components [beg,end) match the components of "n".
* If "n" is not an LdapName, each of its components is parsed as
* the string form of an RDN.
* The following must hold: end - beg == n.size().
*/
private boolean matches(int beg, int end, Name n) {
if (n instanceof LdapName) {
LdapName ln = (LdapName) n;
return doesListMatch(beg, end, ln.rdns);
} else {
for (int i = beg; i < end; i++) {
Rdn rdn;
String rdnString = n.get(i - beg);
try {
rdn = (new Rfc2253Parser(rdnString)).parseRdn();
} catch (InvalidNameException e) {
return false;
}
if (!rdn.equals(rdns.get(i))) {
return false;
}
}
}
return true;
}
/**
* Adds the components of a name -- in order -- to the end of this name.
*
* @param suffix The non-null components to add.
* @return The updated name (not a new instance).
*
* @throws InvalidNameException if {@code suffix} is not a valid LDAP
* name, or if the addition of the components would violate the
* syntax rules of this LDAP name.
*/
public Name addAll(Name suffix) throws InvalidNameException {
return addAll(size(), suffix);
}
/**
* Adds the RDNs of a name -- in order -- to the end of this name.
*
* @param suffixRdns The non-null suffix {@code Rdn}s to add.
* @return The updated name (not a new instance).
*/
public Name addAll(List<Rdn> suffixRdns) {
return addAll(size(), suffixRdns);
}
/**
* Adds the components of a name -- in order -- at a specified position
* within this name. Components of this LDAP name at or after the
* index (if any) of the first new component are shifted up
* (away from index 0) to accommodate the new components.
*
* @param suffix The non-null components to add.
* @param posn The index at which to add the new component.
* Must be in the range [0,size()].
*
* @return The updated name (not a new instance).
*
* @throws InvalidNameException if {@code suffix} is not a valid LDAP
* name, or if the addition of the components would violate the
* syntax rules of this LDAP name.
* @throws IndexOutOfBoundsException
* If posn is outside the specified range.
*/
public Name addAll(int posn, Name suffix)
throws InvalidNameException {
unparsed = null; // no longer valid
if (suffix instanceof LdapName) {
LdapName s = (LdapName) suffix;
rdns.addAll(posn, s.rdns);
} else {
Enumeration<String> comps = suffix.getAll();
while (comps.hasMoreElements()) {
rdns.add(posn++,
(new Rfc2253Parser(comps.nextElement()).
parseRdn()));
}
}
return this;
}
/**
* Adds the RDNs of a name -- in order -- at a specified position
* within this name. RDNs of this LDAP name at or after the
* index (if any) of the first new RDN are shifted up (away from index 0) to
* accommodate the new RDNs.
*
* @param suffixRdns The non-null suffix {@code Rdn}s to add.
* @param posn The index at which to add the suffix RDNs.
* Must be in the range [0,size()].
*
* @return The updated name (not a new instance).
* @throws IndexOutOfBoundsException
* If posn is outside the specified range.
*/
public Name addAll(int posn, List<Rdn> suffixRdns) {
unparsed = null;
for (int i = 0; i < suffixRdns.size(); i++) {
Object obj = suffixRdns.get(i);
if (!(obj instanceof Rdn)) {
throw new IllegalArgumentException("Entry:" + obj +
" not a valid type;suffix list entries must be of type Rdn");
}
rdns.add(i + posn, (Rdn)obj);
}
return this;
}
/**
* Adds a single component to the end of this LDAP name.
*
* @param comp The non-null component to add.
* @return The updated LdapName, not a new instance.
* Cannot be null.
* @exception InvalidNameException If adding comp at end of the name
* would violate the name's syntax.
*/
public Name add(String comp) throws InvalidNameException {
return add(size(), comp);
}
/**
* Adds a single RDN to the end of this LDAP name.
*
* @param comp The non-null RDN to add.
*
* @return The updated LdapName, not a new instance.
* Cannot be null.
*/
public Name add(Rdn comp) {
return add(size(), comp);
}
/**
* Adds a single component at a specified position within this
* LDAP name.
* Components of this LDAP name at or after the index (if any) of the new
* component are shifted up by one (away from index 0) to accommodate
* the new component.
*
* @param comp The non-null component to add.
* @param posn The index at which to add the new component.
* Must be in the range [0,size()].
* @return The updated LdapName, not a new instance.
* Cannot be null.
* @exception IndexOutOfBoundsException
* If posn is outside the specified range.
* @exception InvalidNameException If adding comp at the
* specified position would violate the name's syntax.
*/
public Name add(int posn, String comp) throws InvalidNameException {
Rdn rdn = (new Rfc2253Parser(comp)).parseRdn();
rdns.add(posn, rdn);
unparsed = null; // no longer valid
return this;
}
/**
* Adds a single RDN at a specified position within this
* LDAP name.
* RDNs of this LDAP name at or after the index (if any) of the new
* RDN are shifted up by one (away from index 0) to accommodate
* the new RDN.
*
* @param comp The non-null RDN to add.
* @param posn The index at which to add the new RDN.
* Must be in the range [0,size()].
* @return The updated LdapName, not a new instance.
* Cannot be null.
* @exception IndexOutOfBoundsException
* If posn is outside the specified range.
*/
public Name add(int posn, Rdn comp) {
if (comp == null) {
throw new NullPointerException("Cannot set comp to null");
}
rdns.add(posn, comp);
unparsed = null; // no longer valid
return this;
}
/**
* Removes a component from this LDAP name.
* The component of this name at the specified position is removed.
* Components with indexes greater than this position (if any)
* are shifted down (toward index 0) by one.
*
* @param posn The index of the component to remove.
* Must be in the range [0,size()).
* @return The component removed (a String).
*
* @throws IndexOutOfBoundsException
* if posn is outside the specified range.
* @throws InvalidNameException if deleting the component
* would violate the syntax rules of the name.
*/
public Object remove(int posn) throws InvalidNameException {
unparsed = null; // no longer valid
return rdns.remove(posn).toString();
}
/**
* Retrieves the list of relative distinguished names.
* The contents of the list are unmodifiable.
* The indexing of RDNs in the returned list follows the numbering of
* RDNs as described in the class description.
* If the name has zero components, an empty list is returned.
*
* @return The name as a list of RDNs which are instances of
* the class {@link Rdn Rdn}.
*/
public List<Rdn> getRdns() {
return Collections.unmodifiableList(rdns);
}
/**
* Generates a new copy of this name.
* Subsequent changes to the components of this name will not
* affect the new copy, and vice versa.
*
* @return A copy of the this LDAP name.
*/
public Object clone() {
return new LdapName(unparsed, rdns, 0, rdns.size());
}
/**
* Returns a string representation of this LDAP name in a format
* defined by <a href="http://www.ietf.org/rfc/rfc2253.txt">RFC 2253</a>
* and described in the class description. If the name has zero
* components an empty string is returned.
*
* @return The string representation of the LdapName.
*/
public String toString() {
if (unparsed != null) {
return unparsed;
}
StringBuilder builder = new StringBuilder();
int size = rdns.size();
if ((size - 1) >= 0) {
builder.append(rdns.get(size - 1));
}
for (int next = size - 2; next >= 0; next--) {
builder.append(',');
builder.append(rdns.get(next));
}
unparsed = builder.toString();
return unparsed;
}
/**
* Determines whether two LDAP names are equal.
* If obj is null or not an LDAP name, false is returned.
* <p>
* Two LDAP names are equal if each RDN in one is equal
* to the corresponding RDN in the other. This implies
* both have the same number of RDNs, and each RDN's
* equals() test against the corresponding RDN in the other
* name returns true. See {@link Rdn#equals(Object obj)}
* for a definition of RDN equality.
*
* @param obj The possibly null object to compare against.
* @return true if obj is equal to this LDAP name,
* false otherwise.
* @see #hashCode
*/
public boolean equals(Object obj) {
// check possible shortcuts
if (obj == this) {
return true;
}
if (!(obj instanceof LdapName)) {
return false;
}
LdapName that = (LdapName) obj;
if (rdns.size() != that.rdns.size()) {
return false;
}
if (unparsed != null && unparsed.equalsIgnoreCase(
that.unparsed)) {
return true;
}
// Compare RDNs one by one for equality
for (int i = 0; i < rdns.size(); i++) {
// Compare a single pair of RDNs.
Rdn rdn1 = rdns.get(i);
Rdn rdn2 = that.rdns.get(i);
if (!rdn1.equals(rdn2)) {
return false;
}
}
return true;
}
/**
* Compares this LdapName with the specified Object for order.
* Returns a negative integer, zero, or a positive integer as this
* Name is less than, equal to, or greater than the given Object.
* <p>
* If obj is null or not an instance of LdapName, ClassCastException
* is thrown.
* <p>
* Ordering of LDAP names follows the lexicographical rules for
* string comparison, with the extension that this applies to all
* the RDNs in the LDAP name. All the RDNs are lined up in their
* specified order and compared lexicographically.
* See {@link Rdn#compareTo(Object obj) Rdn.compareTo(Object obj)}
* for RDN comparison rules.
* <p>
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