Source Code Cross Referenced for REFilterInputStream.java in  » IDE » J » gnu » regexp » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » IDE » J » gnu.regexp 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         *  gnu/regexp/REFilterInputStream.java
003:         *  Copyright (C) 1998-2001 Wes Biggs
004:         *
005:         *  This library is free software; you can redistribute it and/or modify
006:         *  it under the terms of the GNU Lesser General Public License as published
007:         *  by the Free Software Foundation; either version 2.1 of the License, or
008:         *  (at your option) any later version.
009:         *
010:         *  This library is distributed in the hope that it will be useful,
011:         *  but WITHOUT ANY WARRANTY; without even the implied warranty of
012:         *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
013:         *  GNU Lesser General Public License for more details.
014:         *
015:         *  You should have received a copy of the GNU Lesser General Public License
016:         *  along with this program; if not, write to the Free Software
017:         *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
018:         */
019:
020:        package gnu.regexp;
021:
022:        import java.io.FilterInputStream;
023:        import java.io.InputStream;
024:
025:        /**
026:         * Replaces instances of a given RE found within an InputStream
027:         * with replacement text.   The replacements are interpolated into the
028:         * stream when a match is found.
029:         *
030:         * @author <A HREF="mailto:wes@cacas.org">Wes Biggs</A>
031:         * @deprecated This class cannot properly handle all character
032:         *             encodings.  For proper handling, use the REFilterReader
033:         *             class instead.
034:         */
035:
036:        public class REFilterInputStream extends FilterInputStream {
037:
038:            private RE expr;
039:            private String replace;
040:            private String buffer;
041:            private int bufpos;
042:            private int offset;
043:            private CharIndexedInputStream stream;
044:
045:            /**
046:             * Creates an REFilterInputStream.  When reading from this stream,
047:             * occurrences of patterns matching the supplied regular expression
048:             * will be replaced with the supplied replacement text (the
049:             * metacharacters $0 through $9 may be used to refer to the full
050:             * match or subexpression matches).
051:             *
052:             * @param stream The InputStream to be filtered.
053:             * @param expr The regular expression to search for.
054:             * @param replace The text pattern to replace matches with.  
055:             */
056:            public REFilterInputStream(InputStream stream, RE expr,
057:                    String replace) {
058:                super (stream);
059:                this .stream = new CharIndexedInputStream(stream, 0);
060:                this .expr = expr;
061:                this .replace = replace;
062:            }
063:
064:            /**
065:             * Reads the next byte from the stream per the general contract of
066:             * InputStream.read().  Returns -1 on error or end of stream.
067:             */
068:            public int read() {
069:                // If we have buffered replace data, use it.
070:                if ((buffer != null) && (bufpos < buffer.length())) {
071:                    return (int) buffer.charAt(bufpos++);
072:                }
073:
074:                // check if input is at a valid position
075:                if (!stream.isValid())
076:                    return -1;
077:
078:                REMatch mymatch = new REMatch(expr.getNumSubs(), offset, 0);
079:                if (expr.match(stream, mymatch)) {
080:                    mymatch.end[0] = mymatch.index;
081:                    mymatch.finish(stream);
082:                    stream.move(mymatch.toString().length());
083:                    offset += mymatch.toString().length();
084:                    buffer = mymatch.substituteInto(replace);
085:                    bufpos = 1;
086:
087:                    // This is prone to infinite loops if replace string turns out empty.
088:                    if (buffer.length() > 0) {
089:                        return buffer.charAt(0);
090:                    }
091:                }
092:                char ch = stream.charAt(0);
093:                if (ch == CharIndexed.OUT_OF_BOUNDS)
094:                    return -1;
095:                stream.move(1);
096:                offset++;
097:                return ch;
098:            }
099:
100:            /** 
101:             * Returns false.  REFilterInputStream does not support mark() and
102:             * reset() methods. 
103:             */
104:            public boolean markSupported() {
105:                return false;
106:            }
107:
108:            /** Reads from the stream into the provided array. */
109:            public int read(byte[] b, int off, int len) {
110:                int i;
111:                int ok = 0;
112:                while (len-- > 0) {
113:                    i = read();
114:                    if (i == -1)
115:                        return (ok == 0) ? -1 : ok;
116:                    b[off++] = (byte) i;
117:                    ok++;
118:                }
119:                return ok;
120:            }
121:
122:            /** Reads from the stream into the provided array. */
123:            public int read(byte[] b) {
124:                return read(b, 0, b.length);
125:            }
126:        }
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