Source Code Cross Referenced for Terminal.java in  » ERP-CRM-Financial » SourceTap-CRM » org » ofbiz » rules » parse » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » ERP CRM Financial » SourceTap CRM » org.ofbiz.rules.parse 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        package org.ofbiz.rules.parse;
002:
003:        import java.util.*;
004:
005:        /**
006:         * <p><b>Title:</b> Terminal
007:         * <p><b>Description:</b> None
008:         * <p>Copyright (c) 1999 Steven J. Metsker.
009:         * <p>Copyright (c) 2001 The Open For Business Project - www.ofbiz.org
010:         *
011:         * <p>Permission is hereby granted, free of charge, to any person obtaining a
012:         *  copy of this software and associated documentation files (the "Software"),
013:         *  to deal in the Software without restriction, including without limitation
014:         *  the rights to use, copy, modify, merge, publish, distribute, sublicense,
015:         *  and/or sell copies of the Software, and to permit persons to whom the
016:         *  Software is furnished to do so, subject to the following conditions:
017:         *
018:         * <p>The above copyright notice and this permission notice shall be included
019:         *  in all copies or substantial portions of the Software.
020:         *
021:         * <p>THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
022:         *  OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
023:         *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
024:         *  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
025:         *  CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT
026:         *  OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR
027:         *  THE USE OR OTHER DEALINGS IN THE SOFTWARE.
028:         *
029:         * <br>
030:         * <p>A <code>Terminal</code> is a parser that is not a
031:         * composition of other parsers. Terminals are "terminal"
032:         * because they do not pass matching work on to other
033:         * parsers. The criterion that terminals use to check a
034:         * match is something other than another parser. Terminals
035:         * are also the only parsers that advance an assembly.
036:         *
037:         * @author Steven J. Metsker
038:         * @version 1.0
039:         */
040:        public class Terminal extends Parser {
041:
042:            /**
043:             * whether or not this terminal should push itself upon an
044:             * assembly's stack after a successful match
045:             */
046:            protected boolean discard = false;
047:
048:            /**
049:             * Constructs an unnamed terminal.
050:             */
051:            public Terminal() {
052:            }
053:
054:            /**
055:             * Constructs a terminal with the given name.
056:             *
057:             * @param    String    A name to be known by.
058:             */
059:            public Terminal(String name) {
060:                super (name);
061:            }
062:
063:            /**
064:             * Accept a "visitor" and a collection of previously visited
065:             * parsers.
066:             *
067:             * @param   pv   the visitor to accept
068:             *
069:             * @param   visited   a collection of previously visited parsers
070:             */
071:            public void accept(ParserVisitor pv, List visited) {
072:                pv.visitTerminal(this , visited);
073:            }
074:
075:            /**
076:             * A convenience method that sets discarding to be true.
077:             *
078:             * @return   this
079:             */
080:            public Terminal discard() {
081:                return setDiscard(true);
082:            }
083:
084:            /**
085:             * Given a collection of assemblies, this method matches
086:             * this terminal against all of them, and returns a new
087:             * collection of the assemblies that result from the
088:             * matches.
089:             *
090:             * @return   a List of assemblies that result from
091:             *           matching against a beginning set of assemblies
092:             *
093:             * @param   in   a vector of assemblies to match against
094:             *
095:             */
096:            public List match(List in) {
097:                List out = new ArrayList();
098:                Enumeration e = Collections.enumeration(in);
099:
100:                while (e.hasMoreElements()) {
101:                    Assembly a = (Assembly) e.nextElement();
102:                    Assembly b = matchOneAssembly(a);
103:
104:                    if (b != null) {
105:                        out.add(b);
106:                    }
107:                }
108:                return out;
109:            }
110:
111:            /**
112:             * Returns an assembly equivalent to the supplied assembly,
113:             * except that this terminal will have been removed from the
114:             * front of the assembly. As with any parser, if the
115:             * match succeeds, this terminal's assembler will work on
116:             * the assembly. If the match fails, this method returns
117:             * null.
118:             *
119:             * @param   Assembly  the assembly to match against
120:             *
121:             * @return a copy of the incoming assembly, advanced by this
122:             *         terminal
123:             */
124:            protected Assembly matchOneAssembly(Assembly in) {
125:                if (!in.hasMoreElements()) {
126:                    return null;
127:                }
128:                if (qualifies(in.peek())) {
129:                    Assembly out = (Assembly) in.clone();
130:                    Object o = out.nextElement();
131:
132:                    if (!discard) {
133:                        out.push(o);
134:                    }
135:                    return out;
136:                }
137:                return null;
138:            }
139:
140:            /**
141:             * The mechanics of matching are the same for many terminals,
142:             * except for the check that the next element on the assembly
143:             * qualifies as the type of terminal this terminal looks for.
144:             * This method performs that check.
145:             *
146:             * @param   Object   an element from a assembly
147:             *
148:             * @return   true, if the object is the kind of terminal this
149:             *           parser seeks
150:             */
151:            protected boolean qualifies(Object o) {
152:                return true;
153:            }
154:
155:            /**
156:             * By default, create a collection with this terminal's
157:             * string representation of itself. (Most subclasses
158:             * override this.)
159:             */
160:            public List randomExpansion(int maxDepth, int depth) {
161:                List v = new ArrayList();
162:
163:                v.add(this .toString());
164:                return v;
165:            }
166:
167:            /**
168:             * By default, terminals push themselves upon a assembly's
169:             * stack, after a successful match. This routine will turn
170:             * off (or turn back on) that behavior.
171:             *
172:             * @param   boolean   true, if this terminal should push
173:             *                    itself on a assembly's stack
174:             *
175:             * @return   this
176:             */
177:            public Terminal setDiscard(boolean discard) {
178:                this .discard = discard;
179:                return this ;
180:            }
181:
182:            /**
183:             * Returns a textual description of this parser.
184:             */
185:            protected String unvisitedString(List visited) {
186:                return "any";
187:            }
188:        }
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