001: /*
002:
003: ============================================================================
004: The Apache Software License, Version 1.1
005: ============================================================================
006:
007: Copyright (C) 1999-2003 The Apache Software Foundation. All rights reserved.
008:
009: Redistribution and use in source and binary forms, with or without modifica-
010: tion, are permitted provided that the following conditions are met:
011:
012: 1. Redistributions of source code must retain the above copyright notice,
013: this list of conditions and the following disclaimer.
014:
015: 2. Redistributions in binary form must reproduce the above copyright notice,
016: this list of conditions and the following disclaimer in the documentation
017: and/or other materials provided with the distribution.
018:
019: 3. The end-user documentation included with the redistribution, if any, must
020: include the following acknowledgment: "This product includes software
021: developed by the Apache Software Foundation (http://www.apache.org/)."
022: Alternately, this acknowledgment may appear in the software itself, if
023: and wherever such third-party acknowledgments normally appear.
024:
025: 4. The names "Batik" and "Apache Software Foundation" must not be
026: used to endorse or promote products derived from this software without
027: prior written permission. For written permission, please contact
028: apache@apache.org.
029:
030: 5. Products derived from this software may not be called "Apache", nor may
031: "Apache" appear in their name, without prior written permission of the
032: Apache Software Foundation.
033:
034: THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
035: INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
036: FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
037: APACHE SOFTWARE FOUNDATION OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
038: INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLU-
039: DING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
040: OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
041: ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
042: (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
043: THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
044:
045: This software consists of voluntary contributions made by many individuals
046: on behalf of the Apache Software Foundation. For more information on the
047: Apache Software Foundation, please see <http://www.apache.org/>.
048:
049: */
050:
051: package org.apache.batik.util.io;
052:
053: import java.io.IOException;
054: import java.io.Reader;
055:
056: /**
057: * This class represents a reader which normalizes the line break: \n,
058: * \r, \r\n are replaced by \n. The methods of this reader are not
059: * synchronized. The input is buffered.
060: *
061: * @author <a href="mailto:stephane@hillion.org">Stephane Hillion</a>
062: * @version $Id$
063: */
064: public abstract class NormalizingReader extends Reader {
065:
066: /**
067: * Read characters into a portion of an array.
068: * @param cbuf Destination buffer
069: * @param off Offset at which to start writing characters
070: * @param len Maximum number of characters to read
071: * @return The number of characters read, or -1 if the end of the
072: * stream has been reached
073: */
074: public int read(char cbuf[], int off, int len) throws IOException {
075: if (len == 0) {
076: return 0;
077: }
078:
079: int c = read();
080: if (c == -1) {
081: return -1;
082: }
083: int result = 0;
084: do {
085: cbuf[result + off] = (char) c;
086: result++;
087: c = read();
088: } while (c != -1 && result < len);
089: return result;
090: }
091:
092: /**
093: * Returns the current line in the stream.
094: */
095: public abstract int getLine();
096:
097: /**
098: * Returns the current column in the stream.
099: */
100: public abstract int getColumn();
101:
102: }
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