Source Code Cross Referenced for BinaryColumn.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.index.BTree;
033:        import com.caucho.db.index.KeyCompare;
034:        import com.caucho.db.index.BinaryKeyCompare;
035:        import com.caucho.db.sql.Expr;
036:        import com.caucho.db.sql.QueryContext;
037:        import com.caucho.db.sql.SelectResult;
038:        import com.caucho.db.store.Transaction;
039:        import com.caucho.sql.SQLExceptionWrapper;
040:        import com.caucho.util.L10N;
041:
042:        import java.sql.SQLException;
043:        import java.util.logging.Level;
044:        import java.util.logging.Logger;
045:
046:        class BinaryColumn extends Column {
047:            private static final Logger log = Logger
048:                    .getLogger(BinaryColumn.class.getName());
049:            private static final L10N L = new L10N(BinaryColumn.class);
050:
051:            private final int _maxLength;
052:
053:            /**
054:             * Creates a binary column.
055:             *
056:             * @param columnOffset the offset within the row
057:             * @param maxLength the maximum length of the binary
058:             */
059:            BinaryColumn(Row row, String name, int maxLength) {
060:                super (row, name);
061:
062:                if (maxLength < 0)
063:                    throw new IllegalArgumentException(
064:                            "length must be non-negative");
065:                else if (255 < maxLength)
066:                    throw new IllegalArgumentException("length too big");
067:
068:                _maxLength = maxLength;
069:            }
070:
071:            /**
072:             * Returns the type code for the column.
073:             */
074:            public int getTypeCode() {
075:                return VARBINARY;
076:            }
077:
078:            /**
079:             * Returns the java type.
080:             */
081:            public Class getJavaType() {
082:                return String.class;
083:            }
084:
085:            /**
086:             * Returns the declaration size
087:             */
088:            public int getDeclarationSize() {
089:                return _maxLength;
090:            }
091:
092:            /**
093:             * Returns the column's size.
094:             */
095:            public int getLength() {
096:                return _maxLength + 1;
097:            }
098:
099:            /**
100:             * Returns the key compare for the column.
101:             */
102:            public KeyCompare getIndexKeyCompare() {
103:                return new BinaryKeyCompare();
104:            }
105:
106:            /**
107:             * Sets the string value.
108:             *
109:             * @param block the buffer to store the row
110:             * @param rowOffset the offset into the row
111:             * @param str the string value
112:             */
113:            void setString(Transaction xa, byte[] block, int rowOffset,
114:                    String str) {
115:                int offset = rowOffset + _columnOffset;
116:
117:                if (str == null) {
118:                    setNull(block, rowOffset);
119:                    return;
120:                }
121:
122:                int len = str.length();
123:                int maxOffset = offset + _maxLength + 1;
124:
125:                int lenOffset = offset++;
126:                for (int i = 0; i < len && offset < maxOffset; i++) {
127:                    int ch = str.charAt(i);
128:
129:                    if (ch < 0x80)
130:                        block[offset++] = (byte) ch;
131:                    else if (ch < 0x800) {
132:                        block[offset++] = (byte) (0xc0 + ((ch >> 6) & 0x1f));
133:                        block[offset++] = (byte) (0x80 + (ch & 0x3f));
134:                    } else {
135:                        block[offset++] = (byte) (0xe0 + ((ch >> 12) & 0x0f));
136:                        block[offset++] = (byte) (0x80 + ((ch >> 6) & 0x3f));
137:                        block[offset++] = (byte) (0x80 + (ch & 0x3f));
138:                    }
139:                }
140:                block[lenOffset] = (byte) (offset - lenOffset - 1);
141:
142:                setNonNull(block, rowOffset);
143:            }
144:
145:            public String getString(byte[] block, int rowOffset) {
146:                if (isNull(block, rowOffset))
147:                    return null;
148:
149:                int startOffset = rowOffset + _columnOffset;
150:                int len = block[startOffset] & 0xff;
151:
152:                StringBuffer sb = new StringBuffer();
153:
154:                int offset = startOffset + 1;
155:                int endOffset = offset + len;
156:                int i = 0;
157:                while (offset < endOffset) {
158:                    int ch1 = block[offset++] & 0xff;
159:
160:                    if (ch1 < 0x80)
161:                        sb.append((char) ch1);
162:                    else if ((ch1 & 0xe0) == 0xc0) {
163:                        int ch2 = block[offset++] & 0xff;
164:
165:                        sb.append((char) ((ch1 & 0x1f) << 6) + (ch2 & 0x3f));
166:                    } else {
167:                        int ch2 = block[offset++] & 0xff;
168:                        int ch3 = block[offset++] & 0xff;
169:
170:                        sb.append((char) ((ch1 & 0x0f) << 12)
171:                                + ((ch2 & 0x3f) << 6) + ((ch3 & 0x3f)));
172:                    }
173:                }
174:
175:                return sb.toString();
176:            }
177:
178:            /**
179:             * Sets the column based on an expression.
180:             *
181:             * @param block the block's buffer
182:             * @param rowOffset the offset of the row in the block
183:             * @param expr the expression to store
184:             */
185:            void setExpr(Transaction xa, byte[] block, int rowOffset,
186:                    Expr expr, QueryContext context) throws SQLException {
187:                if (expr.isNull(null))
188:                    setNull(block, rowOffset);
189:                else
190:                    setString(xa, block, rowOffset, expr.evalString(context));
191:            }
192:
193:            /**
194:             * Returns true if the items in the given rows match.
195:             */
196:            public boolean isEqual(byte[] block1, int rowOffset1,
197:                    byte[] block2, int rowOffset2) {
198:                if (isNull(block1, rowOffset1) != isNull(block2, rowOffset2))
199:                    return false;
200:
201:                int startOffset1 = rowOffset1 + _columnOffset;
202:                int len1 = block1[startOffset1] & 0xff;
203:
204:                int startOffset2 = rowOffset2 + _columnOffset;
205:                int len2 = block2[startOffset2] & 0xff;
206:
207:                if (len1 != len2)
208:                    return false;
209:
210:                for (int i = len1; i > 0; i--) {
211:                    if (block1[startOffset1 + i] != block2[startOffset2 + i])
212:                        return false;
213:                }
214:
215:                return true;
216:            }
217:
218:            /**
219:             * Returns true if the bytes match.
220:             */
221:            public boolean isEqual(byte[] block, int rowOffset, byte[] buffer,
222:                    int offset, int length) {
223:                if (isNull(block, rowOffset))
224:                    return false;
225:
226:                int startOffset = rowOffset + _columnOffset;
227:                int len = block[startOffset] & 0xff;
228:
229:                if (len != length)
230:                    return false;
231:
232:                int blockOffset = startOffset + 1;
233:                int endOffset = blockOffset + len;
234:                while (blockOffset < endOffset) {
235:                    if (block[blockOffset++] != buffer[offset++])
236:                        return false;
237:                }
238:
239:                return true;
240:            }
241:
242:            public boolean isEqual(byte[] block, int rowOffset, String value) {
243:                if (value == null)
244:                    return isNull(block, rowOffset);
245:                else if (isNull(block, rowOffset))
246:                    return false;
247:
248:                int startOffset = rowOffset + _columnOffset;
249:                int len = block[startOffset] & 0xff;
250:
251:                int strLength = value.length();
252:                int strOffset = 0;
253:
254:                int offset = startOffset + 1;
255:                int endOffset = offset + len;
256:                while (offset < endOffset && strOffset < strLength) {
257:                    char ch = value.charAt(strOffset++);
258:
259:                    int ch1 = block[offset++] & 0xff;
260:
261:                    // XXX: missing utf-8
262:                    if (ch1 != ch)
263:                        return false;
264:                }
265:
266:                return offset == endOffset && strOffset == strLength;
267:            }
268:
269:            /**
270:             * Evaluates the column to a stream.
271:             */
272:            public void evalToResult(byte[] block, int rowOffset,
273:                    SelectResult result) {
274:                if (isNull(block, rowOffset)) {
275:                    result.writeNull();
276:                    return;
277:                }
278:
279:                // XXX: add writeVarBinary to SelectResult
280:                result.writeString(getString(block, rowOffset));
281:            }
282:
283:            /**
284:             * Evaluate to a buffer.
285:             *
286:             * @param block the block's buffer
287:             * @param rowOffset the offset of the row in the block
288:             * @param buffer the result buffer
289:             * @param buffer the result buffer offset
290:             *
291:             * @return the length of the value
292:             */
293:            int evalToBuffer(byte[] block, int rowOffset, byte[] buffer,
294:                    int bufferOffset) throws SQLException {
295:                if (isNull(block, rowOffset))
296:                    return 0;
297:
298:                int startOffset = rowOffset + _columnOffset;
299:                // static length for now
300:                int len = getLength();
301:
302:                System.arraycopy(block, startOffset, buffer, bufferOffset, len);
303:
304:                return len;
305:            }
306:
307:            /**
308:             * Sets any index for the column.
309:             *
310:             * @param block the block's buffer
311:             * @param rowOffset the offset of the row in the block
312:             * @param rowAddr the address of the row
313:             */
314:            void setIndex(Transaction xa, byte[] block, int rowOffset,
315:                    long rowAddr, QueryContext context) throws SQLException {
316:                BTree index = getIndex();
317:
318:                if (index != null) {
319:                    try {
320:                        index.insert(block, rowOffset + _columnOffset,
321:                                getLength(), rowAddr, xa, false);
322:                    } catch (SQLException e) {
323:                        log.log(Level.FINER, e.toString(), e);
324:
325:                        throw new SQLExceptionWrapper(
326:                                L
327:                                        .l(
328:                                                "StringColumn '{0}.{1}' unique index set failed for {2}\n{3}",
329:                                                getTable().getName(),
330:                                                getName(), getString(block,
331:                                                        rowOffset), e
332:                                                        .toString()), e);
333:                    }
334:                }
335:            }
336:
337:            /**
338:             * Deleting the row, based on the column.
339:             *
340:             * @param block the block's buffer
341:             * @param rowOffset the offset of the row in the block
342:             * @param expr the expression to store
343:             */
344:            void delete(Transaction xa, byte[] block, int rowOffset)
345:                    throws SQLException {
346:                BTree index = getIndex();
347:
348:                if (index != null)
349:                    index.remove(block, rowOffset + _columnOffset, getLength(),
350:                            xa);
351:            }
352:
353:            public String toString() {
354:                if (getIndex() != null)
355:                    return "VarBinaryColumn[" + getName() + ",index]";
356:                else
357:                    return "VarBinaryColumn[" + getName() + "]";
358:            }
359:        }
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