/*
* 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);
}
}