Source Code Cross Referenced for CharTokenizer.java in  » Net » lucene-connector » org » apache » lucene » analysis » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Net » lucene connector » org.apache.lucene.analysis 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        package org.apache.lucene.analysis;
02:
03:        /**
04:         * Licensed to the Apache Software Foundation (ASF) under one or more
05:         * contributor license agreements.  See the NOTICE file distributed with
06:         * this work for additional information regarding copyright ownership.
07:         * The ASF licenses this file to You under the Apache License, Version 2.0
08:         * (the "License"); you may not use this file except in compliance with
09:         * the License.  You may obtain a copy of the License at
10:         *
11:         *     http://www.apache.org/licenses/LICENSE-2.0
12:         *
13:         * Unless required by applicable law or agreed to in writing, software
14:         * distributed under the License is distributed on an "AS IS" BASIS,
15:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16:         * See the License for the specific language governing permissions and
17:         * limitations under the License.
18:         */
19:
20:        import java.io.IOException;
21:        import java.io.Reader;
22:
23:        /** An abstract base class for simple, character-oriented tokenizers.*/
24:        public abstract class CharTokenizer extends Tokenizer {
25:            public CharTokenizer(Reader input) {
26:                super (input);
27:            }
28:
29:            private int offset = 0, bufferIndex = 0, dataLen = 0;
30:            private static final int MAX_WORD_LEN = 255;
31:            private static final int IO_BUFFER_SIZE = 4096;
32:            private final char[] ioBuffer = new char[IO_BUFFER_SIZE];
33:
34:            /** Returns true iff a character should be included in a token.  This
35:             * tokenizer generates as tokens adjacent sequences of characters which
36:             * satisfy this predicate.  Characters for which this is false are used to
37:             * define token boundaries and are not included in tokens. */
38:            protected abstract boolean isTokenChar(char c);
39:
40:            /** Called on each token character to normalize it before it is added to the
41:             * token.  The default implementation does nothing.  Subclasses may use this
42:             * to, e.g., lowercase tokens. */
43:            protected char normalize(char c) {
44:                return c;
45:            }
46:
47:            public final Token next(Token token) throws IOException {
48:                token.clear();
49:                int length = 0;
50:                int start = bufferIndex;
51:                char[] buffer = token.termBuffer();
52:                while (true) {
53:
54:                    if (bufferIndex >= dataLen) {
55:                        offset += dataLen;
56:                        dataLen = input.read(ioBuffer);
57:                        if (dataLen == -1) {
58:                            if (length > 0)
59:                                break;
60:                            else
61:                                return null;
62:                        }
63:                        bufferIndex = 0;
64:                    }
65:
66:                    final char c = ioBuffer[bufferIndex++];
67:
68:                    if (isTokenChar(c)) { // if it's a token char
69:
70:                        if (length == 0) // start of token
71:                            start = offset + bufferIndex - 1;
72:                        else if (length == buffer.length)
73:                            buffer = token.resizeTermBuffer(1 + length);
74:
75:                        buffer[length++] = normalize(c); // buffer it, normalized
76:
77:                        if (length == MAX_WORD_LEN) // buffer overflow!
78:                            break;
79:
80:                    } else if (length > 0) // at non-Letter w/ chars
81:                        break; // return 'em
82:                }
83:
84:                token.termLength = length;
85:                token.startOffset = start;
86:                token.endOffset = start + length;
87:                return token;
88:            }
89:
90:            public void reset(Reader input) throws IOException {
91:                super .reset(input);
92:                bufferIndex = 0;
93:                offset = 0;
94:                dataLen = 0;
95:            }
96:        }
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