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package com.sun.codemodel;
/**
* JClass for generating expressions containing operators
*/
abstract public class JOp {
private JOp() {
}
/**
* Determine whether the top level of an expression involves an
* operator.
*/
static boolean hasTopOp(JExpression e) {
return (e instanceof UnaryOp) || (e instanceof BinaryOp);
}
/* -- Unary operators -- */
static private class UnaryOp extends JExpressionImpl {
protected String op;
protected JExpression e;
protected boolean opFirst = true;
UnaryOp(String op, JExpression e) {
this.op = op;
this.e = e;
}
UnaryOp(JExpression e, String op) {
this.op = op;
this.e = e;
opFirst = false;
}
public void generate(JFormatter f) {
if (opFirst)
f.p('(').p(op).g(e).p(')');
else
f.p('(').g(e).p(op).p(')');
}
}
public static JExpression minus(JExpression e) {
return new UnaryOp("-", e);
}
/**
* Logical not {@code '!x'}.
*/
public static JExpression not(JExpression e) {
if (e == JExpr.TRUE) return JExpr.FALSE;
if (e == JExpr.FALSE) return JExpr.TRUE;
return new UnaryOp("!", e);
}
public static JExpression complement(JExpression e) {
return new UnaryOp("~", e);
}
static private class TightUnaryOp extends UnaryOp {
TightUnaryOp(JExpression e, String op) {
super(e, op);
}
public void generate(JFormatter f) {
if (opFirst)
f.p(op).g(e);
else
f.g(e).p(op);
}
}
public static JExpression incr(JExpression e) {
return new TightUnaryOp(e, "++");
}
public static JExpression decr(JExpression e) {
return new TightUnaryOp(e, "--");
}
/* -- Binary operators -- */
static private class BinaryOp extends JExpressionImpl {
String op;
JExpression left;
JGenerable right;
BinaryOp(String op, JExpression left, JGenerable right) {
this.left = left;
this.op = op;
this.right = right;
}
public void generate(JFormatter f) {
f.p('(').g(left).p(op).g(right).p(')');
}
}
public static JExpression plus(JExpression left, JExpression right) {
return new BinaryOp("+", left, right);
}
public static JExpression minus(JExpression left, JExpression right) {
return new BinaryOp("-", left, right);
}
public static JExpression mul(JExpression left, JExpression right) {
return new BinaryOp("*", left, right);
}
public static JExpression div(JExpression left, JExpression right) {
return new BinaryOp("/", left, right);
}
public static JExpression mod(JExpression left, JExpression right) {
return new BinaryOp("%", left, right);
}
public static JExpression shl(JExpression left, JExpression right) {
return new BinaryOp("<<", left, right);
}
public static JExpression shr(JExpression left, JExpression right) {
return new BinaryOp(">>", left, right);
}
public static JExpression shrz(JExpression left, JExpression right) {
return new BinaryOp(">>>", left, right);
}
public static JExpression band(JExpression left, JExpression right) {
return new BinaryOp("&", left, right);
}
public static JExpression bor(JExpression left, JExpression right) {
return new BinaryOp("|", left, right);
}
public static JExpression cand(JExpression left, JExpression right) {
if (left == JExpr.TRUE) return right;
if (right == JExpr.TRUE) return left;
if (left == JExpr.FALSE) return left; // JExpr.FALSE
if (right == JExpr.FALSE) return right; // JExpr.FALSE
return new BinaryOp("&&", left, right);
}
public static JExpression cor(JExpression left, JExpression right) {
if (left == JExpr.TRUE) return left; // JExpr.TRUE
if (right == JExpr.TRUE) return right; // JExpr.FALSE
if (left == JExpr.FALSE) return right;
if (right == JExpr.FALSE) return left;
return new BinaryOp("||", left, right);
}
public static JExpression xor(JExpression left, JExpression right) {
return new BinaryOp("^", left, right);
}
public static JExpression lt(JExpression left, JExpression right) {
return new BinaryOp("<", left, right);
}
public static JExpression lte(JExpression left, JExpression right) {
return new BinaryOp("<=", left, right);
}
public static JExpression gt(JExpression left, JExpression right) {
return new BinaryOp(">", left, right);
}
public static JExpression gte(JExpression left, JExpression right) {
return new BinaryOp(">=", left, right);
}
public static JExpression eq(JExpression left, JExpression right) {
return new BinaryOp("==", left, right);
}
public static JExpression ne(JExpression left, JExpression right) {
return new BinaryOp("!=", left, right);
}
public static JExpression _instanceof(JExpression left, JType right) {
return new BinaryOp("instanceof", left, right);
}
/* -- Ternary operators -- */
static private class TernaryOp extends JExpressionImpl {
String op1;
String op2;
JExpression e1;
JExpression e2;
JExpression e3;
TernaryOp(String op1, String op2,
JExpression e1, JExpression e2, JExpression e3) {
this.e1 = e1;
this.op1 = op1;
this.e2 = e2;
this.op2 = op2;
this.e3 = e3;
}
public void generate(JFormatter f) {
f.p('(').g(e1).p(op1).g(e2).p(op2).g(e3).p(')');
}
}
public static JExpression cond(JExpression cond,
JExpression ifTrue, JExpression ifFalse) {
return new TernaryOp("?", ":", cond, ifTrue, ifFalse);
}
}