Source Code Cross Referenced for KeywordMap.java in  » Web-Services » soapui-1.7.5 » org » syntax » jedit » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Web Services » soapui 1.7.5 » org.syntax.jedit 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * KeywordMap.java - Fast keyword->id map
003:         * Copyright (C) 1998, 1999 Slava Pestov
004:         * Copyright (C) 1999 Mike Dillon
005:         *
006:         * You may use and modify this package for any purpose. Redistribution is
007:         * permitted, in both source and binary form, provided that this notice
008:         * remains intact in all source distributions of this package.
009:         */
010:
011:        package org.syntax.jedit;
012:
013:        import javax.swing.text.Segment;
014:
015:        import org.syntax.jedit.tokenmarker.Token;
016:
017:        /**
018:         * A <code>KeywordMap</code> is similar to a hashtable in that it maps keys
019:         * to values. However, the `keys' are Swing segments. This allows lookups of
020:         * text substrings without the overhead of creating a new string object.
021:         * <p>
022:         * This class is used by <code>CTokenMarker</code> to map keywords to ids.
023:         *
024:         * @author Slava Pestov, Mike Dillon
025:         * @version $Id$
026:         */
027:        public class KeywordMap {
028:            /**
029:             * Creates a new <code>KeywordMap</code>.
030:             * @param ignoreCase True if keys are case insensitive
031:             */
032:            public KeywordMap(boolean ignoreCase) {
033:                this (ignoreCase, 52);
034:                this .ignoreCase = ignoreCase;
035:            }
036:
037:            /**
038:             * Creates a new <code>KeywordMap</code>.
039:             * @param ignoreCase True if the keys are case insensitive
040:             * @param mapLength The number of `buckets' to create.
041:             * A value of 52 will give good performance for most maps.
042:             */
043:            public KeywordMap(boolean ignoreCase, int mapLength) {
044:                this .mapLength = mapLength;
045:                this .ignoreCase = ignoreCase;
046:                map = new Keyword[mapLength];
047:            }
048:
049:            /**
050:             * Looks up a key.
051:             * @param text The text segment
052:             * @param offset The offset of the substring within the text segment
053:             * @param length The length of the substring
054:             */
055:            public byte lookup(Segment text, int offset, int length) {
056:                if (length == 0)
057:                    return Token.NULL;
058:                Keyword k = map[getSegmentMapKey(text, offset, length)];
059:                while (k != null) {
060:                    if (length != k.keyword.length) {
061:                        k = k.next;
062:                        continue;
063:                    }
064:                    if (SyntaxUtilities.regionMatches(ignoreCase, text, offset,
065:                            k.keyword))
066:                        return k.id;
067:                    k = k.next;
068:                }
069:                return Token.NULL;
070:            }
071:
072:            /**
073:             * Adds a key-value mapping.
074:             * @param keyword The key
075:             * @Param id The value
076:             */
077:            public void add(String keyword, byte id) {
078:                int key = getStringMapKey(keyword);
079:                map[key] = new Keyword(keyword.toCharArray(), id, map[key]);
080:            }
081:
082:            /**
083:             * Returns true if the keyword map is set to be case insensitive,
084:             * false otherwise.
085:             */
086:            public boolean getIgnoreCase() {
087:                return ignoreCase;
088:            }
089:
090:            /**
091:             * Sets if the keyword map should be case insensitive.
092:             * @param ignoreCase True if the keyword map should be case
093:             * insensitive, false otherwise
094:             */
095:            public void setIgnoreCase(boolean ignoreCase) {
096:                this .ignoreCase = ignoreCase;
097:            }
098:
099:            // protected members
100:            protected int mapLength;
101:
102:            protected int getStringMapKey(String s) {
103:                return (Character.toUpperCase(s.charAt(0)) + Character
104:                        .toUpperCase(s.charAt(s.length() - 1)))
105:                        % mapLength;
106:            }
107:
108:            protected int getSegmentMapKey(Segment s, int off, int len) {
109:                return (Character.toUpperCase(s.array[off]) + Character
110:                        .toUpperCase(s.array[off + len - 1]))
111:                        % mapLength;
112:            }
113:
114:            // private members
115:            class Keyword {
116:                public Keyword(char[] keyword, byte id, Keyword next) {
117:                    this .keyword = keyword;
118:                    this .id = id;
119:                    this .next = next;
120:                }
121:
122:                public char[] keyword;
123:                public byte id;
124:                public Keyword next;
125:            }
126:
127:            private Keyword[] map;
128:            private boolean ignoreCase;
129:        }
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