/*
* Copyright (c) 1999, 2008, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*
*
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*/
package javax.management;
/**
* This class is used by the query-building mechanism to represent binary
* relations.
* @serial include
*
* @since 1.5
*/
class
MatchQueryExp extends
QueryEval implements
QueryExp {
/* Serial version */
private static final long
serialVersionUID = -7156603696948215014L;
/**
* @serial The attribute value to be matched
*/
private
AttributeValueExp exp;
/**
* @serial The pattern to be matched
*/
private
String pattern;
/**
* Basic Constructor.
*/
public
MatchQueryExp() {
}
/**
* Creates a new MatchQueryExp where the specified AttributeValueExp matches
* the specified pattern StringValueExp.
*/
public
MatchQueryExp(
AttributeValueExp a,
StringValueExp s) {
exp =
a;
pattern =
s.
getValue();
}
/**
* Returns the attribute of the query.
*/
public
AttributeValueExp getAttribute() {
return
exp;
}
/**
* Returns the pattern of the query.
*/
public
String getPattern() {
return
pattern;
}
/**
* Applies the MatchQueryExp on a MBean.
*
* @param name The name of the MBean on which the MatchQueryExp will be applied.
*
* @return True if the query was successfully applied to the MBean, false otherwise.
*
* @exception BadStringOperationException
* @exception BadBinaryOpValueExpException
* @exception BadAttributeValueExpException
* @exception InvalidApplicationException
*/
public boolean
apply(
ObjectName name) throws
BadStringOperationException,
BadBinaryOpValueExpException,
BadAttributeValueExpException,
InvalidApplicationException {
ValueExp val =
exp.
apply(
name);
if (!(
val instanceof
StringValueExp)) {
return false;
}
return
wildmatch(((
StringValueExp)
val).
getValue(),
pattern);
}
/**
* Returns the string representing the object
*/
public
String toString() {
return
exp + " like " + new
StringValueExp(
pattern);
}
/*
* Tests whether string s is matched by pattern p.
* Supports "?", "*", "[", each of which may be escaped with "\";
* character classes may use "!" for negation and "-" for range.
* Not yet supported: internationalization; "\" inside brackets.<P>
* Wildcard matching routine by Karl Heuer. Public Domain.<P>
*/
private static boolean
wildmatch(
String s,
String p) {
char
c;
int
si = 0,
pi = 0;
int
slen =
s.
length();
int
plen =
p.
length();
while (
pi <
plen) { // While still string
c =
p.
charAt(
pi++);
if (
c == '?') {
if (++
si >
slen)
return false;
} else if (
c == '[') { // Start of choice
if (
si >=
slen)
return false;
boolean
wantit = true;
boolean
seenit = false;
if (
p.
charAt(
pi) == '!') {
wantit = false;
++
pi;
}
while ((
c =
p.
charAt(
pi)) != ']' && ++
pi <
plen) {
if (
p.
charAt(
pi) == '-' &&
pi+1 <
plen &&
p.
charAt(
pi+1) != ']') {
if (
s.
charAt(
si) >=
p.
charAt(
pi-1) &&
s.
charAt(
si) <=
p.
charAt(
pi+1)) {
seenit = true;
}
++
pi;
} else {
if (
c ==
s.
charAt(
si)) {
seenit = true;
}
}
}
if ((
pi >=
plen) || (
wantit !=
seenit)) {
return false;
}
++
pi;
++
si;
} else if (
c == '*') { // Wildcard
if (
pi >=
plen)
return true;
do {
if (
wildmatch(
s.
substring(
si),
p.
substring(
pi)))
return true;
} while (++
si <
slen);
return false;
} else if (
c == '\\') {
if (
pi >=
plen ||
si >=
slen ||
p.
charAt(
pi++) !=
s.
charAt(
si++))
return false;
} else {
if (
si >=
slen ||
c !=
s.
charAt(
si++)) {
return false;
}
}
}
return (
si ==
slen);
}
}