Source Code Cross Referenced for SerialBlob.java in  » Apache-Harmony-Java-SE » javax-package » javax » sql » rowset » serial » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Apache Harmony Java SE » javax package » javax.sql.rowset.serial 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         *  Licensed to the Apache Software Foundation (ASF) under one or more
003:         *  contributor license agreements.  See the NOTICE file distributed with
004:         *  this work for additional information regarding copyright ownership.
005:         *  The ASF licenses this file to You under the Apache License, Version 2.0
006:         *  (the "License"); you may not use this file except in compliance with
007:         *  the License.  You may obtain a copy of the License at
008:         *
009:         *     http://www.apache.org/licenses/LICENSE-2.0
010:         *
011:         *  Unless required by applicable law or agreed to in writing, software
012:         *  distributed under the License is distributed on an "AS IS" BASIS,
013:         *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014:         *  See the License for the specific language governing permissions and
015:         *  limitations under the License.
016:         */
017:
018:        package javax.sql.rowset.serial;
019:
020:        import java.io.ByteArrayInputStream;
021:        import java.io.InputStream;
022:        import java.io.OutputStream;
023:        import java.io.Serializable;
024:        import java.sql.Blob;
025:        import java.sql.SQLException;
026:
027:        import org.apache.harmony.sql.internal.nls.Messages;
028:
029:        public class SerialBlob implements  Blob, Serializable, Cloneable {
030:
031:            private static final long serialVersionUID = -8144641928112860441L;
032:
033:            // required by serialized form
034:            private byte[] buf;
035:
036:            // required by serialized form
037:            @SuppressWarnings("unused")
038:            private Blob blob;
039:
040:            // required by serialized form
041:            private long len;
042:
043:            // required by serialized form
044:            @SuppressWarnings("unused")
045:            private long origLen;
046:
047:            /**
048:             * Constructs an instance by the given <code>blob</code>
049:             * 
050:             * @param blob
051:             *            the given blob
052:             * @throws SerialException
053:             *             if an error is encountered during serialization
054:             * @throws SQLException
055:             *             if <code>blob</code> is null
056:             */
057:            public SerialBlob(Blob blob) throws SerialException, SQLException {
058:                if (blob == null) {
059:                    throw new SQLException(Messages.getString("sql.13")); //$NON-NLS-1$
060:                }
061:                this .blob = blob;
062:                buf = blob.getBytes(1, (int) blob.length());
063:                len = buf.length;
064:                origLen = len;
065:            }
066:
067:            /**
068:             * Constructs an instance by the given <code>buf</code>
069:             * 
070:             * @param buf
071:             *            the given buffer
072:             * @throws SerialException
073:             *             if an error is encountered during serialization
074:             * @throws SQLException
075:             *             if a SQL error is encountered
076:             */
077:            public SerialBlob(byte[] buf) throws SerialException, SQLException {
078:                this .buf = new byte[buf.length];
079:                len = buf.length;
080:                origLen = len;
081:                System.arraycopy(buf, 0, this .buf, 0, (int) len);
082:            }
083:
084:            /**
085:             * Returns an input stream of this SerialObject.
086:             * 
087:             * @throws SerialException
088:             *             if an error is encountered
089:             */
090:            public InputStream getBinaryStream() throws SerialException {
091:                return new ByteArrayInputStream(buf);
092:            }
093:
094:            /**
095:             * Returns a copied array of this SerialObject, starting at the
096:             * <code> pos </code> with the given <code> length</code> number. If
097:             * <code> pos </code> + <code> length </code> - 1 is larger than the length
098:             * of this SerialObject array, the <code> length </code> will be shortened
099:             * to the length of array - <code>pos</code> + 1.
100:             * 
101:             * @param pos
102:             *            the starting position of the array to be copied.
103:             * @param length
104:             *            the total length of bytes to be copied
105:             * @throws SerialException
106:             *             if an error is encountered
107:             */
108:            public byte[] getBytes(long pos, int length) throws SerialException {
109:                if (pos < 1 || pos > len || length < 0) {
110:                    throw new SerialException(Messages.getString("sql.14")); //$NON-NLS-1$
111:                }
112:                if (length > len - pos + 1) {
113:                    length = (int) (len - pos + 1);
114:                }
115:                byte[] copiedArray = new byte[length];
116:                System.arraycopy(buf, (int) pos - 1, copiedArray, 0, length);
117:                return copiedArray;
118:            }
119:
120:            /**
121:             * Gets the number of bytes in this SerialBlob object.
122:             * 
123:             * @return an long value with the length of the SerialBlob in bytes
124:             * @throws SerialException
125:             *             if an error is encoutnered
126:             */
127:            public long length() throws SerialException {
128:                return len;
129:            }
130:
131:            /**
132:             * Search for the position in this Blob at which a specified pattern begins,
133:             * starting at a specified position within the Blob.
134:             * 
135:             * @param pattern
136:             *            a Blob containing the pattern of data to search for in this
137:             *            Blob
138:             * @param start
139:             *            the position within this Blob to start the search, where the
140:             *            first position in the Blob is 1
141:             * @return a long value with the position at which the pattern begins. -1 if
142:             *         the pattern is not found in this Blob.
143:             * @throws SQLException
144:             *             if an error occurs accessing the Blob
145:             * @throws SerialException
146:             *             if an error is encountered
147:             */
148:            public long position(Blob pattern, long start)
149:                    throws SerialException, SQLException {
150:                byte[] patternBytes = pattern.getBytes(1, (int) pattern
151:                        .length());
152:                return position(patternBytes, start);
153:            }
154:
155:            /**
156:             * Search for the position in this Blob at which the specified pattern
157:             * begins, starting at a specified position within the Blob.
158:             * 
159:             * @param pattern
160:             *            a byte array containing the pattern of data to search for in
161:             *            this Blob
162:             * @param start
163:             *            the position within this Blob to start the search, where the
164:             *            first position in the Blob is 1
165:             * @return a long value with the position at which the pattern begins. -1 if
166:             *         the pattern is not found in this Blob.
167:             * @throws SerialException
168:             *             if an error is encountered
169:             * @throws SQLException
170:             *             if an error occurs accessing the Blob
171:             */
172:            public long position(byte[] pattern, long start)
173:                    throws SerialException, SQLException {
174:                if (start < 1 || len - (start - 1) < pattern.length) {
175:                    return -1;
176:                }
177:
178:                for (int i = (int) (start - 1); i <= (len - pattern.length); ++i) {
179:                    if (match(buf, i, pattern)) {
180:                        return i + 1;
181:                    }
182:                }
183:                return -1;
184:            }
185:
186:            /*
187:             * Returns true if the bytes array contains exactly the same elements from
188:             * start position to start + subBytes.length as subBytes. Otherwise returns
189:             * false.
190:             */
191:            private boolean match(byte[] bytes, int start, byte[] subBytes) {
192:                for (int i = 0; i < subBytes.length;) {
193:                    if (bytes[start++] != subBytes[i++]) {
194:                        return false;
195:                    }
196:                }
197:                return true;
198:            }
199:
200:            public OutputStream setBinaryStream(long pos)
201:                    throws SerialException, SQLException {
202:                if (blob == null) {
203:                    throw new SerialException(Messages.getString("sql.18")); //$NON-NLS-1$
204:                }
205:                OutputStream os = blob.setBinaryStream(pos);
206:                if (os == null) {
207:                    throw new SerialException(Messages.getString("sql.18")); //$NON-NLS-1$
208:                }
209:                return os;
210:            }
211:
212:            public int setBytes(long pos, byte[] theBytes)
213:                    throws SerialException, SQLException {
214:                return setBytes(pos, theBytes, 0, theBytes.length);
215:            }
216:
217:            public int setBytes(long pos, byte[] theBytes, int offset,
218:                    int length) throws SQLException {
219:                if (pos < 1 || length < 0 || pos > (len - length + 1)) {
220:                    throw new SerialException(Messages.getString("sql.15")); // $NON-NLS-1$
221:                }
222:                if (offset < 0 || length < 0
223:                        || offset > (theBytes.length - length)) {
224:                    throw new SerialException(Messages.getString("sql.16")); // $NON-NLS-1$
225:                }
226:                System.arraycopy(theBytes, offset, buf, (int) pos - 1, length);
227:                return length;
228:            }
229:
230:            public void truncate(long length) throws SerialException {
231:                if (length > this .len) {
232:                    throw new SerialException(Messages.getString("sql.17")); //$NON-NLS-1$
233:                }
234:                buf = getBytes(1, (int) length);
235:                len = length;
236:            }
237:
238:        }
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