JDK14/Java14源码在线阅读
/*
* Copyright (c) 1999, 2011, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* 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).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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*/
package javax.naming;
import java.util.Locale;
import java.util.Vector;
import java.util.Enumeration;
import java.util.Properties;
import java.util.NoSuchElementException;
/**
* The implementation class for CompoundName and CompositeName.
* This class is package private.
*
* @author Rosanna Lee
* @author Scott Seligman
* @author Aravindan Ranganathan
* @since 1.3
*/
class NameImpl {
private static final byte LEFT_TO_RIGHT = 1;
private static final byte RIGHT_TO_LEFT = 2;
private static final byte FLAT = 0;
private Vector<String> components;
private byte syntaxDirection = LEFT_TO_RIGHT;
private String syntaxSeparator = "/";
private String syntaxSeparator2 = null;
private boolean syntaxCaseInsensitive = false;
private boolean syntaxTrimBlanks = false;
private String syntaxEscape = "\\";
private String syntaxBeginQuote1 = "\"";
private String syntaxEndQuote1 = "\"";
private String syntaxBeginQuote2 = "'";
private String syntaxEndQuote2 = "'";
private String syntaxAvaSeparator = null;
private String syntaxTypevalSeparator = null;
// escapingStyle gives the method used at creation time for
// quoting or escaping characters in the name. It is set to the
// first style of quote or escape encountered if and when the name
// is parsed.
private static final int STYLE_NONE = 0;
private static final int STYLE_QUOTE1 = 1;
private static final int STYLE_QUOTE2 = 2;
private static final int STYLE_ESCAPE = 3;
private int escapingStyle = STYLE_NONE;
// Returns true if "match" is not null, and n contains "match" at
// position i.
private final boolean isA(String n, int i, String match) {
return (match != null && n.startsWith(match, i));
}
private final boolean isMeta(String n, int i) {
return (isA(n, i, syntaxEscape) ||
isA(n, i, syntaxBeginQuote1) ||
isA(n, i, syntaxBeginQuote2) ||
isSeparator(n, i));
}
private final boolean isSeparator(String n, int i) {
return (isA(n, i, syntaxSeparator) ||
isA(n, i, syntaxSeparator2));
}
private final int skipSeparator(String name, int i) {
if (isA(name, i, syntaxSeparator)) {
i += syntaxSeparator.length();
} else if (isA(name, i, syntaxSeparator2)) {
i += syntaxSeparator2.length();
}
return (i);
}
private final int extractComp(String name, int i, int len, Vector<String> comps)
throws InvalidNameException {
String beginQuote;
String endQuote;
boolean start = true;
boolean one = false;
StringBuilder answer = new StringBuilder(len);
while (i < len) {
// handle quoted strings
if (start && ((one = isA(name, i, syntaxBeginQuote1)) ||
isA(name, i, syntaxBeginQuote2))) {
// record choice of quote chars being used
beginQuote = one ? syntaxBeginQuote1 : syntaxBeginQuote2;
endQuote = one ? syntaxEndQuote1 : syntaxEndQuote2;
if (escapingStyle == STYLE_NONE) {
escapingStyle = one ? STYLE_QUOTE1 : STYLE_QUOTE2;
}
// consume string until matching quote
for (i += beginQuote.length();
((i < len) && !name.startsWith(endQuote, i));
i++) {
// skip escape character if it is escaping ending quote
// otherwise leave as is.
if (isA(name, i, syntaxEscape) &&
isA(name, i + syntaxEscape.length(), endQuote)) {
i += syntaxEscape.length();
}
answer.append(name.charAt(i)); // copy char
}
// no ending quote found
if (i >= len)
throw
new InvalidNameException(name + ": no close quote");
// new Exception("no close quote");
i += endQuote.length();
// verify that end-quote occurs at separator or end of string
if (i == len || isSeparator(name, i)) {
break;
}
// throw (new Exception(
throw (new InvalidNameException(name +
": close quote appears before end of component"));
} else if (isSeparator(name, i)) {
break;
} else if (isA(name, i, syntaxEscape)) {
if (isMeta(name, i + syntaxEscape.length())) {
// if escape precedes meta, consume escape and let
// meta through
i += syntaxEscape.length();
if (escapingStyle == STYLE_NONE) {
escapingStyle = STYLE_ESCAPE;
}
} else if (i + syntaxEscape.length() >= len) {
throw (new InvalidNameException(name +
": unescaped " + syntaxEscape + " at end of component"));
}
} else if (isA(name, i, syntaxTypevalSeparator) &&
((one = isA(name, i+syntaxTypevalSeparator.length(), syntaxBeginQuote1)) ||
isA(name, i+syntaxTypevalSeparator.length(), syntaxBeginQuote2))) {
// Handle quote occurring after typeval separator
beginQuote = one ? syntaxBeginQuote1 : syntaxBeginQuote2;
endQuote = one ? syntaxEndQuote1 : syntaxEndQuote2;
i += syntaxTypevalSeparator.length();
answer.append(syntaxTypevalSeparator).append(beginQuote); // add back
// consume string until matching quote
for (i += beginQuote.length();
((i < len) && !name.startsWith(endQuote, i));
i++) {
// skip escape character if it is escaping ending quote
// otherwise leave as is.
if (isA(name, i, syntaxEscape) &&
isA(name, i + syntaxEscape.length(), endQuote)) {
i += syntaxEscape.length();
}
answer.append(name.charAt(i)); // copy char
}
// no ending quote found
if (i >= len)
throw
new InvalidNameException(name + ": typeval no close quote");
i += endQuote.length();
answer.append(endQuote); // add back
// verify that end-quote occurs at separator or end of string
if (i == len || isSeparator(name, i)) {
break;
}
throw (new InvalidNameException(name.substring(i) +
": typeval close quote appears before end of component"));
}
answer.append(name.charAt(i++));
start = false;
}
if (syntaxDirection == RIGHT_TO_LEFT)
comps.insertElementAt(answer.toString(), 0);
else
comps.addElement(answer.toString());
return i;
}
private static boolean getBoolean(Properties p, String name) {
return toBoolean(p.getProperty(name));
}
private static boolean toBoolean(String name) {
return ((name != null) &&
name.toLowerCase(Locale.ENGLISH).equals("true"));
}
private final void recordNamingConvention(Properties p) {
String syntaxDirectionStr =
p.getProperty("jndi.syntax.direction", "flat");
if (syntaxDirectionStr.equals("left_to_right")) {
syntaxDirection = LEFT_TO_RIGHT;
} else if (syntaxDirectionStr.equals("right_to_left")) {
syntaxDirection = RIGHT_TO_LEFT;
} else if (syntaxDirectionStr.equals("flat")) {
syntaxDirection = FLAT;
} else {
throw new IllegalArgumentException(syntaxDirectionStr +
" is not a valid value for the jndi.syntax.direction property");
}
if (syntaxDirection != FLAT) {
syntaxSeparator = p.getProperty("jndi.syntax.separator");
syntaxSeparator2 = p.getProperty("jndi.syntax.separator2");
if (syntaxSeparator == null) {
throw new IllegalArgumentException(
"jndi.syntax.separator property required for non-flat syntax");
}
} else {
syntaxSeparator = null;
}
syntaxEscape = p.getProperty("jndi.syntax.escape");
syntaxCaseInsensitive = getBoolean(p, "jndi.syntax.ignorecase");
syntaxTrimBlanks = getBoolean(p, "jndi.syntax.trimblanks");
syntaxBeginQuote1 = p.getProperty("jndi.syntax.beginquote");
syntaxEndQuote1 = p.getProperty("jndi.syntax.endquote");
if (syntaxEndQuote1 == null && syntaxBeginQuote1 != null)
syntaxEndQuote1 = syntaxBeginQuote1;
else if (syntaxBeginQuote1 == null && syntaxEndQuote1 != null)
syntaxBeginQuote1 = syntaxEndQuote1;
syntaxBeginQuote2 = p.getProperty("jndi.syntax.beginquote2");
syntaxEndQuote2 = p.getProperty("jndi.syntax.endquote2");
if (syntaxEndQuote2 == null && syntaxBeginQuote2 != null)
syntaxEndQuote2 = syntaxBeginQuote2;
else if (syntaxBeginQuote2 == null && syntaxEndQuote2 != null)
syntaxBeginQuote2 = syntaxEndQuote2;
syntaxAvaSeparator = p.getProperty("jndi.syntax.separator.ava");
syntaxTypevalSeparator =
p.getProperty("jndi.syntax.separator.typeval");
}
NameImpl(Properties syntax) {
if (syntax != null) {
recordNamingConvention(syntax);
}
components = new Vector<>();
}
NameImpl(Properties syntax, String n) throws InvalidNameException {
this(syntax);
boolean rToL = (syntaxDirection == RIGHT_TO_LEFT);
boolean compsAllEmpty = true;
int len = n.length();
for (int i = 0; i < len; ) {
i = extractComp(n, i, len, components);
String comp = rToL
? components.firstElement()
: components.lastElement();
if (comp.length() >= 1) {
compsAllEmpty = false;
}
if (i < len) {
i = skipSeparator(n, i);
if ((i == len) && !compsAllEmpty) {
// Trailing separator found. Add an empty component.
if (rToL) {
components.insertElementAt("", 0);
} else {
components.addElement("");
}
}
}
}
}
NameImpl(Properties syntax, Enumeration<String> comps) {
this(syntax);
// %% comps could shrink in the middle.
while (comps.hasMoreElements())
components.addElement(comps.nextElement());
}
/*
// Determines whether this component needs any escaping.
private final boolean escapingNeeded(String comp) {
int len = comp.length();
for (int i = 0; i < len; i++) {
if (i == 0) {
if (isA(comp, 0, syntaxBeginQuote1) ||
isA(comp, 0, syntaxBeginQuote2)) {
return (true);
}
}
if (isSeparator(comp, i)) {
return (true);
}
if (isA(comp, i, syntaxEscape)) {
i += syntaxEscape.length();
if (i >= len || isMeta(comp, i)) {
return (true);
}
}
}
return (false);
}
*/
private final String stringifyComp(String comp) {
int len = comp.length();
boolean escapeSeparator = false, escapeSeparator2 = false;
String beginQuote = null, endQuote = null;
StringBuffer strbuf = new StringBuffer(len);
// determine whether there are any separators; if so escape
// or quote them
if (syntaxSeparator != null &&
comp.indexOf(syntaxSeparator) >= 0) {
if (syntaxBeginQuote1 != null) {
beginQuote = syntaxBeginQuote1;
endQuote = syntaxEndQuote1;
} else if (syntaxBeginQuote2 != null) {
beginQuote = syntaxBeginQuote2;
endQuote = syntaxEndQuote2;
} else if (syntaxEscape != null)
escapeSeparator = true;
}
if (syntaxSeparator2 != null &&
comp.indexOf(syntaxSeparator2) >= 0) {
if (syntaxBeginQuote1 != null) {
if (beginQuote == null) {
beginQuote = syntaxBeginQuote1;
endQuote = syntaxEndQuote1;
}
} else if (syntaxBeginQuote2 != null) {
if (beginQuote == null) {
beginQuote = syntaxBeginQuote2;
endQuote = syntaxEndQuote2;
}
} else if (syntaxEscape != null)
escapeSeparator2 = true;
}
// if quoting component,
if (beginQuote != null) {
// start string off with opening quote
strbuf = strbuf.append(beginQuote);
// component is being quoted, so we only need to worry about
// escaping end quotes that occur in component
for (int i = 0; i < len; ) {
if (comp.startsWith(endQuote, i)) {
// end-quotes must be escaped when inside a quoted string
strbuf.append(syntaxEscape).append(endQuote);
i += endQuote.length();
} else {
// no special treatment required
strbuf.append(comp.charAt(i++));
}
}
// end with closing quote
strbuf.append(endQuote);
} else {
// When component is not quoted, add escape for:
// 1. leading quote
// 2. an escape preceding any meta char
// 3. an escape at the end of a component
// 4. separator
// go through characters in component and escape where necessary
boolean start = true;
for (int i = 0; i < len; ) {
// leading quote must be escaped
if (start && isA(comp, i, syntaxBeginQuote1)) {
strbuf.append(syntaxEscape).append(syntaxBeginQuote1);
i += syntaxBeginQuote1.length();
} else if (start && isA(comp, i, syntaxBeginQuote2)) {
strbuf.append(syntaxEscape).append(syntaxBeginQuote2);
i += syntaxBeginQuote2.length();
} else
// Escape an escape preceding meta characters, or at end.
// Other escapes pass through.
if (isA(comp, i, syntaxEscape)) {
if (i + syntaxEscape.length() >= len) {
// escape an ending escape
strbuf.append(syntaxEscape);
} else if (isMeta(comp, i + syntaxEscape.length())) {
// escape meta strings
strbuf.append(syntaxEscape);
}
strbuf.append(syntaxEscape);
i += syntaxEscape.length();
} else
// escape unescaped separator
if (escapeSeparator && comp.startsWith(syntaxSeparator, i)) {
// escape separator
strbuf.append(syntaxEscape).append(syntaxSeparator);
i += syntaxSeparator.length();
} else if (escapeSeparator2 &&
comp.startsWith(syntaxSeparator2, i)) {
// escape separator2
strbuf.append(syntaxEscape).append(syntaxSeparator2);
i += syntaxSeparator2.length();
} else {
// no special treatment required
strbuf.append(comp.charAt(i++));
}
start = false;
}
}
return (strbuf.toString());
}
public String toString() {
StringBuffer answer = new StringBuffer();
String comp;
boolean compsAllEmpty = true;
int size = components.size();
for (int i = 0; i < size; i++) {
if (syntaxDirection == RIGHT_TO_LEFT) {
comp =
stringifyComp(components.elementAt(size - 1 - i));
} else {
comp = stringifyComp(components.elementAt(i));
}
if ((i != 0) && (syntaxSeparator != null))
answer.append(syntaxSeparator);
if (comp.length() >= 1)
compsAllEmpty = false;
answer = answer.append(comp);
}
if (compsAllEmpty && (size >= 1) && (syntaxSeparator != null))
answer = answer.append(syntaxSeparator);
return (answer.toString());
}
public boolean equals(Object obj) {
if ((obj != null) && (obj instanceof NameImpl)) {
NameImpl target = (NameImpl)obj;
if (target.size() == this.size()) {
Enumeration<String> mycomps = getAll();
Enumeration<String> comps = target.getAll();
while (mycomps.hasMoreElements()) {
// %% comps could shrink in the middle.
String my = mycomps.nextElement();
String his = comps.nextElement();
if (syntaxTrimBlanks) {
my = my.trim();
his = his.trim();
}
if (syntaxCaseInsensitive) {
if (!(my.equalsIgnoreCase(his)))
return false;
} else {
if (!(my.equals(his)))
return false;
}
}
return true;
}
}
return false;
}
/**
* Compares obj to this NameImpl to determine ordering.
* Takes into account syntactic properties such as
* elimination of blanks, case-ignore, etc, if relevant.
*
* Note: using syntax of this NameImpl and ignoring
* that of comparison target.
*/
public int compareTo(NameImpl obj) {
if (this == obj) {
return 0;
}
int len1 = size();
int len2 = obj.size();
int n = Math.min(len1, len2);
int index1 = 0, index2 = 0;
while (n-- != 0) {
String comp1 = get(index1++);
String comp2 = obj.get(index2++);
// normalize according to syntax
if (syntaxTrimBlanks) {
comp1 = comp1.trim();
comp2 = comp2.trim();
}
int local;
if (syntaxCaseInsensitive) {
local = comp1.compareToIgnoreCase(comp2);
} else {
local = comp1.compareTo(comp2);
}
if (local != 0) {
return local;
}
}
return len1 - len2;
}
public int size() {
return (components.size());
}
public Enumeration<String> getAll() {
return components.elements();
}
public String get(int posn) {
return components.elementAt(posn);
}
public Enumeration<String> getPrefix(int posn) {
if (posn < 0 || posn > size()) {
throw new ArrayIndexOutOfBoundsException(posn);
}
return new NameImplEnumerator(components, 0, posn);
}
public Enumeration<String> getSuffix(int posn) {
int cnt = size();
if (posn < 0 || posn > cnt) {
throw new ArrayIndexOutOfBoundsException(posn);
}
return new NameImplEnumerator(components, posn, cnt);
}
public boolean isEmpty() {
return (components.isEmpty());
}
public boolean startsWith(int posn, Enumeration<String> prefix) {
if (posn < 0 || posn > size()) {
return false;
}
try {
Enumeration<String> mycomps = getPrefix(posn);
while (mycomps.hasMoreElements()) {
String my = mycomps.nextElement();
String his = prefix.nextElement();
if (syntaxTrimBlanks) {
my = my.trim();
his = his.trim();
}
if (syntaxCaseInsensitive) {
if (!(my.equalsIgnoreCase(his)))
return false;
} else {
if (!(my.equals(his)))
return false;
}
}
} catch (NoSuchElementException e) {
return false;
}
return true;
}
public boolean endsWith(int posn, Enumeration<String> suffix) {
// posn is number of elements in suffix
// startIndex is the starting position in this name
// at which to start the comparison. It is calculated by
// subtracting 'posn' from size()
int startIndex = size() - posn;
if (startIndex < 0 || startIndex > size()) {
return false;
}
try {
Enumeration<String> mycomps = getSuffix(startIndex);
while (mycomps.hasMoreElements()) {
String my = mycomps.nextElement();
String his = suffix.nextElement();
if (syntaxTrimBlanks) {
my = my.trim();
his = his.trim();
}
if (syntaxCaseInsensitive) {
if (!(my.equalsIgnoreCase(his)))
return false;
} else {
if (!(my.equals(his)))
return false;
}
}
} catch (NoSuchElementException e) {
return false;
}
return true;
}
public boolean addAll(Enumeration<String> comps) throws InvalidNameException {
boolean added = false;
while (comps.hasMoreElements()) {
try {
String comp = comps.nextElement();
if (size() > 0 && syntaxDirection == FLAT) {
throw new InvalidNameException(
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