01: //--------------------------------------------------------------------------
02: // Copyright (c) 1998-2004, Drew Davidson and Luke Blanshard
03: // All rights reserved.
04: //
05: // Redistribution and use in source and binary forms, with or without
06: // modification, are permitted provided that the following conditions are
07: // met:
08: //
09: // Redistributions of source code must retain the above copyright notice,
10: // this list of conditions and the following disclaimer.
11: // Redistributions in binary form must reproduce the above copyright
12: // notice, this list of conditions and the following disclaimer in the
13: // documentation and/or other materials provided with the distribution.
14: // Neither the name of the Drew Davidson nor the names of its contributors
15: // may be used to endorse or promote products derived from this software
16: // without specific prior written permission.
17: //
18: // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19: // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20: // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
21: // FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
22: // COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
23: // INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
24: // BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
25: // OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
26: // AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
27: // OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
28: // THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
29: // DAMAGE.
30: //--------------------------------------------------------------------------
31: package ognl;
32:
33: /**
34: * @author Luke Blanshard (blanshlu@netscape.net)
35: * @author Drew Davidson (drew@ognl.org)
36: */
37: public abstract class ExpressionNode extends SimpleNode {
38: public ExpressionNode(int i) {
39: super (i);
40: }
41:
42: public ExpressionNode(OgnlParser p, int i) {
43: super (p, i);
44: }
45:
46: /**
47: Returns true iff this node is constant without respect to the children.
48: */
49: public boolean isNodeConstant(OgnlContext context)
50: throws OgnlException {
51: return false;
52: }
53:
54: public boolean isConstant(OgnlContext context) throws OgnlException {
55: boolean result = isNodeConstant(context);
56:
57: if ((children != null) && (children.length > 0)) {
58: result = true;
59: for (int i = 0; result && (i < children.length); ++i) {
60: if (children[i] instanceof SimpleNode) {
61: result = ((SimpleNode) children[i])
62: .isConstant(context);
63: } else {
64: result = false;
65: }
66: }
67: }
68: return result;
69: }
70:
71: public String getExpressionOperator(int index) {
72: throw new RuntimeException("unknown operator for "
73: + OgnlParserTreeConstants.jjtNodeName[id]);
74: }
75:
76: public String toString() {
77: String result;
78:
79: result = (parent == null) ? "" : "(";
80: if ((children != null) && (children.length > 0)) {
81: for (int i = 0; i < children.length; ++i) {
82: if (i > 0) {
83: result += " " + getExpressionOperator(i) + " ";
84: }
85: result += children[i].toString();
86: }
87: }
88: if (parent != null) {
89: result = result + ")";
90: }
91: return result;
92: }
93: }
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