Source Code Cross Referenced for RandomAccessInputStream.java in  » Database-DBMS » Quadcap-Embeddable-Database » com » quadcap » sql » file » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database DBMS » Quadcap Embeddable Database » com.quadcap.sql.file 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        package com.quadcap.sql.file;
002:
003:        /* Copyright 1997 - 2003 Quadcap Software.  All rights reserved.
004:         *
005:         * This software is distributed under the Quadcap Free Software License.
006:         * This software may be used or modified for any purpose, personal or
007:         * commercial.  Open Source redistributions are permitted.  Commercial
008:         * redistribution of larger works derived from, or works which bundle
009:         * this software requires a "Commercial Redistribution License"; see
010:         * http://www.quadcap.com/purchase.
011:         *
012:         * Redistributions qualify as "Open Source" under  one of the following terms:
013:         *   
014:         *    Redistributions are made at no charge beyond the reasonable cost of
015:         *    materials and delivery.
016:         *
017:         *    Redistributions are accompanied by a copy of the Source Code or by an
018:         *    irrevocable offer to provide a copy of the Source Code for up to three
019:         *    years at the cost of materials and delivery.  Such redistributions
020:         *    must allow further use, modification, and redistribution of the Source
021:         *    Code under substantially the same terms as this license.
022:         *
023:         * Redistributions of source code must retain the copyright notices as they
024:         * appear in each source code file, these license terms, and the
025:         * disclaimer/limitation of liability set forth as paragraph 6 below.
026:         *
027:         * Redistributions in binary form must reproduce this Copyright Notice,
028:         * these license terms, and the disclaimer/limitation of liability set
029:         * forth as paragraph 6 below, in the documentation and/or other materials
030:         * provided with the distribution.
031:         *
032:         * The Software is provided on an "AS IS" basis.  No warranty is
033:         * provided that the Software is free of defects, or fit for a
034:         * particular purpose.  
035:         *
036:         * Limitation of Liability. Quadcap Software shall not be liable
037:         * for any damages suffered by the Licensee or any third party resulting
038:         * from use of the Software.
039:         */
040:
041:        import java.io.InputStream;
042:        import java.io.IOException;
043:
044:        import com.quadcap.util.Debug;
045:
046:        /**
047:         * An input stream attached to a <code>RandomAccess</code> object.
048:         *
049:         * @author Stan Bailes
050:         */
051:        public class RandomAccessInputStream extends InputStream {
052:            RandomAccess ra;
053:            int position;
054:            byte[] buf1 = new byte[1];
055:
056:            public RandomAccessInputStream(RandomAccess ra) {
057:                this .ra = ra;
058:                this .position = 0;
059:            }
060:
061:            public int getPosition() {
062:                return position;
063:            }
064:
065:            public void setPosition(int p) {
066:                position = p;
067:            }
068:
069:            /**
070:             * Reads the next byte of data from this input stream. The value 
071:             * byte is returned as an <code>int</code> in the range 
072:             * <code>0</code> to <code>255</code>. If no byte is available 
073:             * because the end of the stream has been reached, the value 
074:             * <code>-1</code> is returned.
075:             *
076:             * @return     the next byte of data, or <code>-1</code> if the end of the
077:             *             stream is reached.
078:             * @exception  IOException  if an I/O error occurs.
079:             */
080:            public int read() throws IOException {
081:                if (position >= ra.size())
082:                    return -1;
083:
084:                ra.read(position, buf1, 0, 1);
085:                position++;
086:                return buf1[0] & 0xff;
087:            }
088:
089:            /**
090:             * Reads up to <code>len</code> bytes of data from this input stream 
091:             * into an array of bytes. This method blocks until some input is 
092:             * available. If the first argument is <code>null,</code> up to 
093:             * <code>len</code> bytes are read and discarded. 
094:             *
095:             * @param      b     the buffer into which the data is read.
096:             * @param      off   the start offset of the data.
097:             * @param      len   the maximum number of bytes read.
098:             * @return     the total number of bytes read into the buffer, or
099:             *             <code>-1</code> if there is no more data because the end of
100:             *             the stream has been reached.
101:             * @exception  IOException  if an I/O error occurs.
102:             */
103:            public int read(byte b[], int off, int len) throws IOException {
104:                if (position >= ra.size())
105:                    return -1;
106:                if (ra.size() - position < len)
107:                    len = (int) (ra.size() - position);
108:
109:                if (b != null)
110:                    ra.read(position, b, off, len);
111:                position += len;
112:                return len;
113:            }
114:
115:            /**
116:             * Skips over and discards <code>n</code> bytes of data from this 
117:             * input stream. The <code>skip</code> method may, for a variety of 
118:             * reasons, end up skipping over some smaller number of bytes, 
119:             * possibly <code>0</code>. The actual number of bytes skipped is 
120:             * returned. 
121:             * <p>
122:             * The <code>skip</code> method of <code>InputStream</code> creates 
123:             * a byte array of length <code>n</code> and then reads into it until 
124:             * <code>n</code> bytes have been read or the end of the stream has 
125:             * been reached. Subclasses are encouraged to provide a more 
126:             * efficient implementation of this method. 
127:             *
128:             * @param      n   the number of bytes to be skipped.
129:             * @return     the actual number of bytes skipped.
130:             * @exception  IOException  if an I/O error occurs.
131:             * @since      JDK1.0
132:             */
133:            public long skip(long n) throws IOException {
134:                return read(null, 0, (int) n);
135:            }
136:
137:            /**
138:             * Returns the number of bytes that can be read from this input 
139:             * stream without blocking. The available method of 
140:             * <code>InputStream</code> returns <code>0</code>. This method 
141:             * <B>should</B> be overridden by subclasses. 
142:             *
143:             * @return     the number of bytes that can be read from this input stream
144:             *             without blocking.
145:             * @exception  IOException  if an I/O error occurs.
146:             */
147:            public int available() throws IOException {
148:                return (int) (ra.size() - position);
149:            }
150:
151:            /**
152:             * Closes this input stream and releases any system resources 
153:             * associated with the stream. 
154:             *
155:             * @exception  IOException  if an I/O error occurs.
156:             */
157:            public void close() throws IOException {
158:                ra.close();
159:            }
160:
161:        }
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