Source Code Cross Referenced for ByteArrayRandomAccess.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 1999 - 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 com.quadcap.util.Debug;
042:        import com.quadcap.util.Util;
043:
044:        /**
045:         * A <code>RandomAccess</code> implementation using a byte array.
046:         *
047:         * @author Stan Bailes
048:         */
049:        public class ByteArrayRandomAccess extends RandomAccess {
050:            byte[] buf;
051:            int size;
052:
053:            public ByteArrayRandomAccess() {
054:                this .size = 0;
055:                setCapacity(1024);
056:            }
057:
058:            public ByteArrayRandomAccess(int initialCap) {
059:                this .size = 0;
060:                setCapacity(initialCap);
061:            }
062:
063:            public ByteArrayRandomAccess(byte[] buf) {
064:                this .buf = buf;
065:                this .size = buf.length;
066:            }
067:
068:            public void reset(byte[] buf, int size) {
069:                this .buf = buf;
070:                this .size = size;
071:            }
072:
073:            public byte[] getBytes() {
074:                return buf;
075:            }
076:
077:            final void setCapacity(long cap) {
078:                if (buf == null || cap > buf.length) {
079:                    byte[] nbuf = new byte[(int) cap];
080:                    if (size > 0) {
081:                        System.arraycopy(buf, 0, nbuf, 0, size);
082:                    }
083:                    this .buf = nbuf;
084:                }
085:            }
086:
087:            public byte[] toByteArray() {
088:                byte[] ret = new byte[size];
089:                read(0, ret, 0, size);
090:                return ret;
091:            }
092:
093:            /**
094:             * Return the size of the managed region.
095:             */
096:            public long size() {
097:                return size;
098:            }
099:
100:            /**
101:             * Resize the managed region.
102:             */
103:            public void resize(long newSize) {
104:                if (newSize > buf.length) {
105:                    setCapacity(newSize + (newSize >> 1));
106:                }
107:                this .size = (int) newSize;
108:            }
109:
110:            /* Write <tt>len</tt> bytes from position <tt>offset</tt> in buffer
111:             * <tt>buf</tt> to position <tt>pos</tt> bytes into the managed
112:             * area.
113:             */
114:            public void write(long pos, byte[] b, int offset, int len) {
115:                //#ifdef DEBUG
116:                if (trace) {
117:                    Debug.println("BAR:write(" + pos + ", "
118:                            + Util.hexBytes(b, offset, len) + ")");
119:                }
120:                //#endif
121:                System.arraycopy(b, offset, buf, (int) pos, len);
122:            }
123:
124:            /**
125:             * Read <tt>len</tt> bytes from location <tt>pos</tt> of the region
126:             * into the buffer <tt>buf</tt>, starting at <tt>offset</tt>.
127:             */
128:            public void read(long pos, byte[] b, int offset, int len) {
129:                //#ifdef DEBUG
130:                if (trace) {
131:                    Debug.println("BAR:read(" + pos + ", "
132:                            + Util.hexBytes(b, offset, len) + ")");
133:                }
134:                //#endif
135:                System.arraycopy(buf, (int) pos, b, offset, len);
136:            }
137:
138:            //#ifdef DEBUG
139:            static final boolean trace = false;
140:
141:            //#endif
142:
143:            public final void writeByte(int pos, int val) {
144:                buf[pos] = (byte) (val & 0xff);
145:            }
146:
147:            public final int readByte(int pos) {
148:                return buf[pos] & 0xff;
149:            }
150:
151:            /**
152:             * Finalization...
153:             */
154:            public void close() {
155:            }
156:
157:            public void flush() {
158:            }
159:        }
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