Source Code Cross Referenced for BlobColumn.java in  » EJB-Server-resin-3.1.5 » resin » com » caucho » db » table » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » EJB Server resin 3.1.5 » resin » com.caucho.db.table 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright (c) 1998-2008 Caucho Technology -- all rights reserved
003:         *
004:         * This file is part of Resin(R) Open Source
005:         *
006:         * Each copy or derived work must preserve the copyright notice and this
007:         * notice unmodified.
008:         *
009:         * Resin Open Source is free software; you can redistribute it and/or modify
010:         * it under the terms of the GNU General Public License as published by
011:         * the Free Software Foundation; either version 2 of the License, or
012:         * (at your option) any later version.
013:         *
014:         * Resin Open Source is distributed in the hope that it will be useful,
015:         * but WITHOUT ANY WARRANTY; without even the implied warranty of
016:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
017:         * of NON-INFRINGEMENT.  See the GNU General Public License for more
018:         * details.
019:         *
020:         * You should have received a copy of the GNU General Public License
021:         * along with Resin Open Source; if not, write to the
022:         *
023:         *   Free Software Foundation, Inc.
024:         *   59 Temple Place, Suite 330
025:         *   Boston, MA 02111-1307  USA
026:         *
027:         * @author Scott Ferguson
028:         */
029:
030:        package com.caucho.db.table;
031:
032:        import com.caucho.db.sql.Expr;
033:        import com.caucho.db.sql.QueryContext;
034:        import com.caucho.db.sql.SelectResult;
035:        import com.caucho.db.store.BlobInputStream;
036:        import com.caucho.db.store.BlobOutputStream;
037:        import com.caucho.db.store.Inode;
038:        import com.caucho.db.store.Transaction;
039:
040:        import java.io.IOException;
041:        import java.io.InputStream;
042:        import java.sql.SQLException;
043:        import java.util.logging.Level;
044:
045:        class BlobColumn extends Column {
046:            /**
047:             * Creates an inode column.
048:             *
049:             * @param columnOffset the offset within the row
050:             * @param maxLength the maximum length of the string
051:             */
052:            BlobColumn(Row row, String name) {
053:                super (row, name);
054:            }
055:
056:            /**
057:             * Returns the type code for the column.
058:             */
059:            public int getTypeCode() {
060:                return BLOB;
061:            }
062:
063:            /**
064:             * Returns the java type.
065:             */
066:            public Class getJavaType() {
067:                return java.sql.Blob.class;
068:            }
069:
070:            /**
071:             * Returns the declaration size
072:             */
073:            public int getDeclarationSize() {
074:                return 128;
075:            }
076:
077:            /**
078:             * Returns the column's size.
079:             */
080:            public int getLength() {
081:                return 128;
082:            }
083:
084:            /**
085:             * Sets the string value.
086:             *
087:             * @param block the buffer to store the row
088:             * @param rowOffset the offset into the row
089:             * @param str the string value
090:             */
091:            void setString(Transaction xa, byte[] block, int rowOffset,
092:                    String str) {
093:                if (!isNull(block, rowOffset)) {
094:                    long length = Inode.readLong(block, rowOffset
095:                            + _columnOffset);
096:
097:                    if (Table.INLINE_BLOB_SIZE <= length) {
098:                        Inode inode = new Inode();
099:                        inode.init(getTable(), xa, block, rowOffset
100:                                + _columnOffset);
101:                        xa.addDeleteInode(inode);
102:                    }
103:                }
104:
105:                if (str == null) {
106:                    setNull(block, rowOffset);
107:                    return;
108:                }
109:
110:                setNonNull(block, rowOffset);
111:
112:                try {
113:                    BlobOutputStream os;
114:                    os = new BlobOutputStream(xa, getTable(), block, rowOffset
115:                            + _columnOffset);
116:
117:                    int length = str.length();
118:                    for (int i = 0; i < length; i++) {
119:                        int ch = str.charAt(i);
120:
121:                        if (ch < 0x80)
122:                            os.write(ch);
123:                        else if (ch < 0x800) {
124:                            os.write(0xc0 + (ch >> 6));
125:                            os.write(0x80 + (ch & 0x3f));
126:                        } else {
127:                            os.write(0xe0 + (ch >> 12));
128:                            os.write(0x80 + ((ch >> 6) & 0x3f));
129:                            os.write(0x80 + (ch & 0x3f));
130:                        }
131:                    }
132:
133:                    os.close();
134:                } catch (IOException e) {
135:                    log.log(Level.WARNING, e.toString(), e);
136:                }
137:            }
138:
139:            /**
140:             * Sets the string value.
141:             *
142:             * @param block the buffer to store the row
143:             * @param rowOffset the offset into the row
144:             * @param str the string value
145:             */
146:            private void setStream(Transaction xa, byte[] block, int rowOffset,
147:                    InputStream value) {
148:                if (!isNull(block, rowOffset)) {
149:                    long length = Inode.readLong(block, rowOffset
150:                            + _columnOffset);
151:
152:                    if (Table.INLINE_BLOB_SIZE <= length) {
153:                        Inode inode = new Inode();
154:                        inode.init(getTable(), xa, block, rowOffset
155:                                + _columnOffset);
156:                        xa.addDeleteInode(inode);
157:                    }
158:                }
159:
160:                if (value == null) {
161:                    setNull(block, rowOffset);
162:                    return;
163:                }
164:
165:                setNonNull(block, rowOffset);
166:
167:                try {
168:                    BlobOutputStream os;
169:                    os = new BlobOutputStream(xa, getTable(), block, rowOffset
170:                            + _columnOffset);
171:
172:                    int data;
173:                    while ((data = value.read()) >= 0) {
174:                        os.write(data);
175:                    }
176:
177:                    os.close();
178:                    value.close();
179:                } catch (IOException e) {
180:                    log.log(Level.WARNING, e.toString(), e);
181:                }
182:            }
183:
184:            /**
185:             * Deleting the row, based on the column.
186:             *
187:             * @param block the block's buffer
188:             * @param rowOffset the offset of the row in the block
189:             * @param expr the expression to store
190:             */
191:            @Override
192:            void delete(Transaction xa, byte[] block, int rowOffset)
193:                    throws SQLException {
194:                if (!isNull(block, rowOffset)) {
195:                    long length = Inode.readLong(block, rowOffset
196:                            + _columnOffset);
197:
198:                    if (length < Table.INLINE_BLOB_SIZE)
199:                        return;
200:
201:                    Inode inode = new Inode();
202:                    inode
203:                            .init(getTable(), xa, block, rowOffset
204:                                    + _columnOffset);
205:                    xa.addDeleteInode(inode);
206:                }
207:            }
208:
209:            @Override
210:            public String getString(byte[] block, int rowOffset) {
211:                if (isNull(block, rowOffset))
212:                    return null;
213:
214:                try {
215:                    BlobInputStream is;
216:                    is = new BlobInputStream(getTable(), block, rowOffset
217:                            + _columnOffset);
218:
219:                    int ch;
220:                    StringBuilder cb = new StringBuilder();
221:
222:                    while ((ch = is.read()) >= 0) {
223:                        if (ch < 0x80)
224:                            cb.append((char) ch);
225:                        else if ((ch & 0xe0) == 0xc0) {
226:                            int ch1 = is.read();
227:
228:                            cb
229:                                    .append((char) (((ch & 0x3f) << 6) + (ch1 & 0x3f)));
230:                        } else {
231:                            int ch1 = is.read();
232:                            int ch2 = is.read();
233:
234:                            cb.append((char) (((ch & 0xf) << 12)
235:                                    + ((ch1 & 0x3f) << 6) + ((ch2 & 0x3f))));
236:                        }
237:                    }
238:
239:                    is.close();
240:
241:                    return cb.toString();
242:                } catch (IOException e) {
243:                    log.log(Level.WARNING, e.toString(), e);
244:                }
245:
246:                return null;
247:            }
248:
249:            /**
250:             * Sets based on an iterator.
251:             */
252:            public void set(Transaction xa, TableIterator iter, Expr expr,
253:                    QueryContext context) throws SQLException {
254:                byte[] block = iter.getBuffer();
255:                int rowOffset = iter.getRowOffset();
256:
257:                if (expr.isNull(null))
258:                    setNull(block, rowOffset);
259:                else if (expr.isBinaryStream())
260:                    setStream(xa, block, rowOffset, expr.evalStream(context));
261:                else
262:                    setString(xa, block, rowOffset, expr.evalString(context));
263:
264:                iter.setDirty();
265:            }
266:
267:            /**
268:             * Sets the column based on an expression.
269:             *
270:             * @param block the block's buffer
271:             * @param rowOffset the offset of the row in the block
272:             * @param expr the expression to store
273:             */
274:            void setExpr(Transaction xa, byte[] block, int rowOffset,
275:                    Expr expr, QueryContext context) throws SQLException {
276:                if (expr.isNull(null)) {
277:                    setNull(block, rowOffset);
278:                } else if (expr.isBinaryStream()) {
279:                    setStream(xa, block, rowOffset, expr.evalStream(context));
280:                } else {
281:                    setString(xa, block, rowOffset, expr.evalString(context));
282:                }
283:            }
284:
285:            /**
286:             * Returns true if the items in the given rows match.
287:             */
288:            public boolean isEqual(byte[] block1, int rowOffset1,
289:                    byte[] block2, int rowOffset2) {
290:                if (isNull(block1, rowOffset1) != isNull(block2, rowOffset2))
291:                    return false;
292:
293:                int startOffset1 = rowOffset1 + _columnOffset;
294:
295:                int startOffset2 = rowOffset2 + _columnOffset;
296:
297:                for (int i = 128 - 1; i >= 0; i--) {
298:                    if (block1[startOffset1 + i] != block2[startOffset2 + i])
299:                        return false;
300:                }
301:
302:                return true;
303:            }
304:
305:            /**
306:             * Returns true if the bytes match.
307:             */
308:            public boolean isEqual(byte[] block, int rowOffset, byte[] buffer,
309:                    int offset, int length) {
310:                if (isNull(block, rowOffset))
311:                    return false;
312:
313:                return false;
314:            }
315:
316:            public boolean isEqual(byte[] block, int rowOffset, String value) {
317:                if (value == null)
318:                    return isNull(block, rowOffset);
319:                else if (isNull(block, rowOffset))
320:                    return false;
321:
322:                return false;
323:            }
324:
325:            /**
326:             * Evaluates the column to a stream.
327:             */
328:            @Override
329:            public void evalToResult(byte[] block, int rowOffset,
330:                    SelectResult result) {
331:                if (isNull(block, rowOffset)) {
332:                    result.writeNull();
333:                    return;
334:                }
335:
336:                result.writeBlob(block, rowOffset + _columnOffset);
337:            }
338:
339:            public String toString() {
340:                return "BlobColumn[" + getName() + "]";
341:            }
342:        }
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