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/*
* Literal.java 1.0
*
* Jun 20, 1997
* Sep 29, 1997
* Oct 10, 1997
*
* @see io.devnulllabs.openjava.ptree.ParseTree
* @version 1.0 last updated: Oct 10, 1997
* @author Michiaki Tatsubori
*/
package io.devnulllabs.openjava.ptree;
import io.devnulllabs.openjava.mop.Environment;
import io.devnulllabs.openjava.mop.OJClass;
import io.devnulllabs.openjava.mop.OJSystem;
import io.devnulllabs.openjava.ptree.util.ParseTreeVisitor;
/**
* The <code>Literal class</code> represents
* a literal.
*
* @see io.devnulllabs.openjava.ptree.Leaf
* @see io.devnulllabs.openjava.ptree.Expression
*/
public class Literal extends Leaf implements Expression {
/**
* @see io.devnulllabs.openjava.ptree.Literal#getLiteralType()
*/
public static final int BOOLEAN = 0;
public static final int INTEGER = 1;
public static final int LONG = 2;
public static final int FLOAT = 3;
public static final int DOUBLE = 4;
public static final int CHARACTER = 5;
public static final int STRING = 6;
public static final int NULL = 7;
protected int id = -1;
private static Literal constantTrue_ = null;
private static Literal constantFalse_ = null;
private static Literal constantNull_ = null;
private static Literal constantEmptyString_ = null;
private static Literal constantZero_ = null;
private static Literal constantOne_ = null;
/**
* Allocates a new object.
* If you want to make <code>String</code> literal like
* <code>"test"</code>,
* call this constructor in the form :
* <br><blockquote><pre>
* new Literal( Literal.STRING, "\"test\"" )
* </pre></blockquote><br>
* or use makeLiteral() static method.
*
* @param id the id number of the literal.
* @param str the literal as a String.
* @see io.devnulllabs.openjava.ptree.Literal#makeLiteral(String)
*/
public Literal(int id, String str) {
super(str);
this.id = id;
}
/**
* Makes a new object of <code>Literal</code> class
* from the string.
*
* @param str the string.
*/
public static Literal makeLiteral(String str) {
if ("".equals(str)) {
return constantEmptyString();
} else {
return new Literal(Literal.STRING, "\"" + str + "\"");
}
}
/**
* Makes a new object of <code>Literal</code> class
* from the boolean.
*
* @param b the boolean.
*/
public static Literal makeLiteral(boolean b) {
return (b ? constantTrue() : constantFalse());
}
public static Literal makeLiteral(Boolean b) {
return makeLiteral(b.booleanValue());
}
/**
* Makes a new object of <code>Literal</code> class
* from the character.
*
* @param c the character.
*/
public static Literal makeLiteral(char c) {
return new Literal(Literal.CHARACTER, "'" + c + "'");
}
public static Literal makeLiteral(Character c) {
return makeLiteral(c.charValue());
}
/**
* Makes a new object of <code>Literal</code> class
* from the number.
*
* @param num the number.
*/
public static Literal makeLiteral(int num) {
if (num == 0) {
return constantZero();
} else if (num == 1) {
return constantOne();
}
return new Literal(Literal.INTEGER, String.valueOf(num));
}
public static Literal makeLiteral(Integer n) {
return makeLiteral(n.intValue());
}
/**
* Makes a new object of <code>Literal</code> class
* from the number.
*
* @param num the number.
*/
public static Literal makeLiteral(long num) {
return new Literal(Literal.LONG, String.valueOf(num) + "l");
}
public static Literal makeLiteral(Long n) {
return makeLiteral(n.longValue());
}
/**
* Makes a new object of <code>Literal</code> class
* from the number.
*
* @param num the number.
*/
public static Literal makeLiteral(float num) {
return new Literal(Literal.FLOAT, String.valueOf(num) + "f");
}
public static Literal makeLiteral(Float f) {
return makeLiteral(f.floatValue());
}
/**
* Makes a new object of <code>Literal</code> class
* from the number.
*
* @param num the number.
*/
public static Literal makeLiteral(double num) {
return new Literal(Literal.DOUBLE, String.valueOf(num) + "d");
}
public static Literal makeLiteral(Double d) {
return makeLiteral(d.doubleValue());
}
public int getLiteralType() {
return this.id;
}
public static Literal constantTrue() {
if (constantTrue_ == null) {
constantTrue_ = new Literal(Literal.BOOLEAN, "true");
}
return constantTrue_;
}
public static Literal constantFalse() {
if (constantFalse_ == null) {
constantFalse_ = new Literal(Literal.BOOLEAN, "false");
}
return constantFalse_;
}
public static Literal constantNull() {
if (constantNull_ == null) {
constantNull_ = new Literal(Literal.NULL, "null");
}
return constantNull_;
}
public static Literal constantEmptyString() {
if (constantEmptyString_ == null) {
constantEmptyString_ = new Literal(Literal.STRING, "\"\"");
}
return constantEmptyString_;
}
public static Literal constantZero() {
if (constantZero_ == null) {
constantZero_ = new Literal(Literal.INTEGER, "0");
}
return constantZero_;
}
public static Literal constantOne() {
if (constantOne_ == null) {
constantOne_ = new Literal(Literal.INTEGER, "1");
}
return constantOne_;
}
public OJClass getType(Environment env) throws Exception {
switch (getLiteralType()) {
case BOOLEAN :
return OJClass.forClass(boolean.class);
case INTEGER :
return OJClass.forClass(int.class);
case LONG :
return OJClass.forClass(long.class);
case FLOAT :
return OJClass.forClass(float.class);
case DOUBLE :
return OJClass.forClass(double.class);
case CHARACTER :
return OJClass.forClass(char.class);
case STRING :
return OJClass.forClass(String.class);
case NULL :
return OJClass.forName(OJSystem.NULLTYPE_NAME);
}
System.err.println("unknown literal : " + toString());
return null;
}
public void accept(ParseTreeVisitor v) throws ParseTreeException {
v.visit(this);
}
}
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