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/*
* @(#)SelectorToken.java 1.7 07/06/07
*/
package com.sun.messaging.jmq.util.selector;
/**
* Immutable class that represents a token. A token consists of two
* parts. And integer that defines the token, and an optional value
* that defines an associated value. For example a LONG token has
* an associated value that is the value of the long it represents.
*/
class SelectorToken {
// Pre-allocate TRUE, FALSE and UNKNOWN tokens since these are used
// constantly during evaluation.
static final SelectorToken trueToken =
new SelectorToken(Selector.TRUE, "true");
static final SelectorToken falseToken =
new SelectorToken(Selector.FALSE, "false");
static final SelectorToken unknownToken =
new SelectorToken(Selector.UNKNOWN, "unknown");
// Pre-allocate a couple other tokens that commonly appear in expressions.
// Note that LTE and GTE are used to evaluate BETWEEN so it's important
// to have them in here.
static final SelectorToken equalsToken =
new SelectorToken(Selector.EQUALS, "=");
static final SelectorToken notEqualsToken =
new SelectorToken(Selector.NOT_EQUALS, "<>");
static final SelectorToken gtToken =
new SelectorToken(Selector.GT, ">");
static final SelectorToken gteToken =
new SelectorToken(Selector.GTE, ">=");
static final SelectorToken ltToken =
new SelectorToken(Selector.LT, "<");
static final SelectorToken lteToken =
new SelectorToken(Selector.LTE, "<=");
// Pre-allocate marker tokens
static final SelectorToken andMarker =
new SelectorToken(Selector.AND_MARKER, "&");
static final SelectorToken orMarker =
new SelectorToken(Selector.OR_MARKER, "|");
// What this token is.
int token = Selector.UNKNOWN;
// Some tokens have an associated value. For example:
// ESCAPE has an escape character.
// IDENTIFIER has the identifier String
// STRING has the String value
// DOUBLE has the Float value
Object value = null;
public static SelectorToken getInstance(int token, Object value) {
switch (token) {
case Selector.TRUE:
return trueToken;
case Selector.FALSE:
return falseToken;
case Selector.UNKNOWN:
return unknownToken;
case Selector.EQUALS:
return equalsToken;
case Selector.GTE:
return gteToken;
case Selector.LTE:
return lteToken;
case Selector.GT:
return gtToken;
case Selector.LT:
return ltToken;
case Selector.NOT_EQUALS:
return notEqualsToken;
case Selector.AND_MARKER:
return andMarker;
case Selector.OR_MARKER:
return orMarker;
default:
return new SelectorToken(token, value);
}
}
public static SelectorToken getInstance(int token) {
return getInstance(token, null);
}
private SelectorToken(int token) {
this.token = token;
}
private SelectorToken(int token, Object value) {
this.token = token;
this.value = value;
}
public int getToken() {
return token;
}
public Object getValue() {
return value;
}
public boolean equals(Object o) {
if (this == o) return true;
if (!(o instanceof SelectorToken)) {
return false;
}
SelectorToken obj = (SelectorToken)o;
if (obj.token != token) {
return false;
}
return (value == null ? obj.value == null : value.equals(obj.value));
}
public int hashCode() {
if (value == null) {
return token;
} else {
return value.hashCode() * token;
}
}
public String toString() {
return ("[" + token + "," +
(value == null ? "null" : value.toString()) + "]");
}
}
