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package bjc.pratt.tokens;
/**
* Simple token implementation for strings.
*
* @author EVE
*
*/
public class StringToken implements Token<String, String> {
private final String key;
private final String val;
/**
* Create a new string token.
*
* @param ky
* The key for the token.
*
* @param vl
* The value for the token.
*/
public StringToken(final String ky, final String vl) {
key = ky;
val = vl;
}
@Override
public String getKey() {
return key;
}
@Override
public String getValue() {
return val;
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + (key == null ? 0 : key.hashCode());
result = prime * result + (val == null ? 0 : val.hashCode());
return result;
}
@Override
public boolean equals(final Object obj) {
if(this == obj) return true;
if(obj == null) return false;
if(!(obj instanceof StringToken)) return false;
final StringToken other = (StringToken) obj;
if(key == null) {
if(other.key != null) return false;
} else if(!key.equals(other.key)) return false;
if(val == null) {
if(other.val != null) return false;
} else if(!val.equals(other.val)) return false;
return true;
}
@Override
public String toString() {
return String.format("StringToken [key='%s', val='%s']", key, val);
}
/**
* Create a new literal token (has same key/value).
*
* @param val
* The value for the literal token.
*
* @return A literal token with that key.
*/
public static StringToken litToken(final String val) {
return new StringToken(val, val);
}
}
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