public static boolean compare()

in xalan/src/main/java/org/apache/xalan/xsltc/runtime/BasisLibrary.java [696:823]
108 lines of code
38 McCabe index (conditional complexity)

    public static boolean compare(Object left, Object right,
				  int op, DOM dom) 
    { 
	boolean result = false;
	boolean hasSimpleArgs = hasSimpleType(left) && hasSimpleType(right);

    if (op != Operators.EQ && op != Operators.NE) {
	    // If node-boolean comparison -> convert node to boolean
	    if (left instanceof Node || right instanceof Node) {
		if (left instanceof Boolean) {
		    right = new Boolean(booleanF(right));
		    hasSimpleArgs = true;
		}
		if (right instanceof Boolean) {
		    left = new Boolean(booleanF(left));
		    hasSimpleArgs = true;
		}
	    }

	    if (hasSimpleArgs) {
		switch (op) {
        case Operators.GT:
		    return numberF(left, dom) > numberF(right, dom);
		    
        case Operators.LT:
		    return numberF(left, dom) < numberF(right, dom);
		    
        case Operators.GE:
		    return numberF(left, dom) >= numberF(right, dom);
		    
        case Operators.LE:
		    return numberF(left, dom) <= numberF(right, dom);
		    
        default:
		    runTimeError(RUN_TIME_INTERNAL_ERR, "compare()");
		}
	    }
	    // falls through
	}

	if (hasSimpleArgs) {
	    if (left instanceof Boolean || right instanceof Boolean) {
		result = booleanF(left) == booleanF(right);
	    }
	    else if (left instanceof Double || right instanceof Double ||
		     left instanceof Integer || right instanceof Integer) {
		result = numberF(left, dom) == numberF(right, dom);
	    }
	    else { // compare them as strings
		result = stringF(left, dom).equals(stringF(right, dom));
	    }

	    if (op == Operators.NE) {
		result = !result;
	    }
	}
	else {
	    if (left instanceof Node) {
		left = new SingletonIterator(((Node)left).node);
	    }
	    if (right instanceof Node) {
		right = new SingletonIterator(((Node)right).node);
	    }

	    if (hasSimpleType(left) ||
		left instanceof DOM && right instanceof DTMAxisIterator) {
		// swap operands and operator
		final Object temp = right; right = left; left = temp;
                op = Operators.swapOp(op);
	    }

	    if (left instanceof DOM) {
		if (right instanceof Boolean) {
		    result = ((Boolean)right).booleanValue();
		    return result == (op == Operators.EQ);
		}

		final String sleft = ((DOM)left).getStringValue();

		if (right instanceof Number) {
		    result = ((Number)right).doubleValue() ==
			stringToReal(sleft);
		}
		else if (right instanceof String) {
		    result = sleft.equals((String)right);
		}
		else if (right instanceof DOM) {
		    result = sleft.equals(((DOM)right).getStringValue());
		}

		if (op == Operators.NE) {
		    result = !result;
		}
		return result;
	    }

	    // Next, node-set/t for t in {real, string, node-set, result-tree}

	    DTMAxisIterator iter = ((DTMAxisIterator)left).reset();

	    if (right instanceof DTMAxisIterator) {
		result = compare(iter, (DTMAxisIterator)right, op, dom);
	    }
	    else if (right instanceof String) {
		result = compare(iter, (String)right, op, dom);
	    }	
	    else if (right instanceof Number) {
		final double temp = ((Number)right).doubleValue();
		result = compare(iter, temp, op, dom);
	    }
	    else if (right instanceof Boolean) {
		boolean temp = ((Boolean)right).booleanValue();
		result = (iter.reset().next() != DTMAxisIterator.END) == temp;
	    }
	    else if (right instanceof DOM) {
		result = compare(iter, ((DOM)right).getStringValue(),
				 op, dom);
	    }
	    else if (right == null) {
		return(false);
	    }
	    else {
		final String className = right.getClass().getName();
		runTimeError(INVALID_ARGUMENT_ERR, className, "compare()");
	    }
	}
	return result;
    }