01: /*
02: * $Id: HasNode.java,v 1.5 2002/09/16 08:05:04 jkl Exp $
03: *
04: * Copyright (c) 2002 Njet Communications Ltd. All Rights Reserved.
05: *
06: * Use is subject to license terms, as defined in
07: * Anvil Sofware License, Version 1.1. See LICENSE
08: * file, or http://njet.org/license-1.1.txt
09: */
10: package anvil.script.expression;
11:
12: import anvil.core.Any;
13: import anvil.codec.Code;
14: import anvil.script.compiler.ByteCompiler;
15: import anvil.script.Context;
16: import java.io.IOException;
17:
18: /**
19: * class HasNode
20: *
21: * @author: Jani Lehtimäki
22: */
23: public class HasNode extends UnaryParent {
24:
25: private String _symbol;
26:
27: public HasNode(Node child, String symbol) {
28: super (child);
29: _symbol = symbol;
30: }
31:
32: public int typeOf() {
33: return Node.EXPR_HAS;
34: }
35:
36: public Any eval() {
37: return _child.eval().has(_symbol) ? Any.TRUE : Any.FALSE;
38: }
39:
40: public void compile(ByteCompiler context, int operation) {
41: _child.compile(context, GET);
42: Code code = context.getCode();
43: code.astring(_symbol);
44: code.invokevirtual(code.getPool().addMethodRef(
45: context.TYPE_ANY, "has", "(Ljava/lang/String;)Z"));
46: if (operation != GET_BOOLEAN) {
47: context.boolean2any();
48: }
49: }
50:
51: }
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