001: /*
002: * Condition.java
003: *
004: *
005: * Copyright (c) 2003 Rimfaxe ApS (www.rimfaxe.com).
006: * All rights reserved.
007: *
008: * This package is written by Lars Andersen <lars@rimfaxe.com>
009: * and licensed by Rimfaxe ApS.
010: *
011: * Redistribution and use in source and binary forms, with or without
012: * modification, are permitted provided that the following conditions
013: * are met:
014: *
015: * 1. Redistributions of source code must retain the above copyright
016: * notice, this list of conditions and the following disclaimer.
017: *
018: * 2. Redistributions in binary form must reproduce the above copyright
019: * notice, this list of conditions and the following disclaimer in
020: * the documentation and/or other materials provided with the
021: * distribution.
022: *
023: * 3. The end-user documentation included with the redistribution, if
024: * any, must include the following acknowlegement:
025: * "This product includes software developed by Rimfaxe ApS
026: (www.rimfaxe.com)"
027: * Alternately, this acknowlegement may appear in the software itself,
028: * if and wherever such third-party acknowlegements normally appear.
029: *
030: * 4. The names "Rimfaxe", "Rimfaxe Software", "Lars Andersen" and
031: * "Rimfaxe WebServer" must not be used to endorse or promote products
032: * derived from this software without prior written permission. For written
033: * permission, please contact info@rimfaxe.com
034: *
035: * 5. Products derived from this software may not be called "Rimfaxe"
036: * nor may "Rimfaxe" appear in their names without prior written
037: * permission of the Rimfaxe ApS.
038: *
039: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
040: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
041: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
042: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
043: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
044: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
045: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
046: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
047: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
048: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
049: * SUCH DAMAGE.
050: *
051: */
052:
053: package com.rimfaxe.xml.extractor;
054:
055: import com.rimfaxe.util.*;
056: import java.util.*;
057:
058: /**
059: *
060: * @author Lars Andersen
061: */
062: public class Condition extends Object {
063: RimfaxeVector rulevec;
064:
065: /** Creates new Condition */
066: public Condition(RimfaxeVector rulevec) {
067: this .rulevec = rulevec;
068: }
069:
070: public boolean check(String condition) {
071: return evaluate(condition);
072: }
073:
074: protected boolean evaluate(String exp) {
075: boolean and = true;
076: String token = "";
077: com.rimfaxe.util.RimfaxeStringTokenizer tkz = new com.rimfaxe.util.RimfaxeStringTokenizer(
078: exp, "!()", true);
079: token = tkz.nextToken();
080: if (token.equalsIgnoreCase("(")) {
081: String rightStr = "";
082: String leftStr = "";
083:
084: String str = "";
085: int p = 1;
086: while (p != 0) {
087: str = tkz.nextToken();
088:
089: if (str.equalsIgnoreCase(")")) {
090: p--;
091: if (p != 0)
092: leftStr = leftStr.concat(str);
093: } else {
094: if (str.equalsIgnoreCase("("))
095: p++;
096: leftStr = leftStr.concat(str);
097: }
098:
099: }
100: if (tkz.hasMoreTokens()) {
101: str = tkz.nextToken();
102: if (str.equalsIgnoreCase("and"))
103: and = true;
104: else
105: and = false;
106: while (tkz.hasMoreTokens()) {
107: rightStr = rightStr.concat(tkz.nextToken());
108: }
109: if (and)
110: return (evaluate(leftStr) && evaluate(rightStr));
111: else
112: return (evaluate(leftStr) || evaluate(rightStr));
113: }
114: return evaluate(leftStr);
115: }
116:
117: if (token.equalsIgnoreCase("true"))
118: return true;
119: if (token.equalsIgnoreCase("false"))
120: return false;
121: if (token.equalsIgnoreCase("!"))
122: return !evaluate(tkz.nextToken());
123:
124: if (token.equalsIgnoreCase("interval")) {
125: tkz.nextToken(); // (
126: String intexp = tkz.nextToken();
127: tkz.nextToken(); // )
128:
129: return interval(intexp);
130: }
131:
132: return rulevec.contains(exp);
133: }
134:
135: protected boolean interval(String exp) {
136: boolean res = false;
137: com.rimfaxe.util.RimfaxeStringTokenizer tkz = new com.rimfaxe.util.RimfaxeStringTokenizer(
138: exp, ",", false);
139: String field = tkz.nextToken();
140: Integer from = new Integer(tkz.nextToken());
141: Integer to = new Integer(tkz.nextToken());
142:
143: String p = rulevec.getPostStr(field, "=");
144:
145: if (p.equalsIgnoreCase(""))
146: return false;
147: if (!onlyNumbers(p))
148: return false;
149:
150: Integer actual = new Integer(p);
151: if ((from.intValue() <= actual.intValue())
152: && (actual.intValue() <= to.intValue()))
153: return true;
154:
155: return false;
156: }
157:
158: protected String whitespace(String str) {
159: StringBuffer buf = new StringBuffer();
160: com.rimfaxe.util.RimfaxeStringTokenizer tkz = new com.rimfaxe.util.RimfaxeStringTokenizer(
161: str, " \n\t", false);
162: while (tkz.hasMoreTokens()) {
163: buf.append(tkz.nextToken());
164: }
165: return buf.toString();
166: }
167:
168: protected boolean onlyNumbers(String str) {
169: boolean only = true;
170: com.rimfaxe.util.RimfaxeStringTokenizer tkz = new com.rimfaxe.util.RimfaxeStringTokenizer(
171: str, "0123456789", false);
172: while (tkz.hasMoreTokens()) {
173: String tmp = tkz.nextToken();
174: only = false;
175: }
176: return only;
177: }
178: }
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