Source Code Cross Referenced for IntColumn.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:         *   Free SoftwareFoundation, Inc.
023:         *   59 Temple Place, Suite 330
024:         *   Boston, MA 02111-1307  USA
025:         *
026:         * @author Scott Ferguson
027:         */
028:
029:        package com.caucho.db.table;
030:
031:        import com.caucho.db.index.BTree;
032:        import com.caucho.db.index.IntKeyCompare;
033:        import com.caucho.db.index.KeyCompare;
034:        import com.caucho.db.sql.Expr;
035:        import com.caucho.db.sql.QueryContext;
036:        import com.caucho.db.sql.SelectResult;
037:        import com.caucho.db.store.Transaction;
038:
039:        import java.sql.SQLException;
040:
041:        /**
042:         * Represents a 32-bit integer column.
043:         */
044:        class IntColumn extends Column {
045:            /**
046:             * Creates a utf-8 string column.
047:             *
048:             * @param columnOffset the offset within the row
049:             * @param maxLength the maximum length of the string
050:             */
051:            IntColumn(Row row, String name) {
052:                super (row, name);
053:            }
054:
055:            /**
056:             * Returns the column's type code.
057:             */
058:            public int getTypeCode() {
059:                return INT;
060:            }
061:
062:            /**
063:             * Returns the column's Java type.
064:             */
065:            public Class getJavaType() {
066:                return int.class;
067:            }
068:
069:            /**
070:             * Returns the column's declaration size.
071:             */
072:            public int getDeclarationSize() {
073:                return 4;
074:            }
075:
076:            /**
077:             * Returns the column's size.
078:             */
079:            public int getLength() {
080:                return 4;
081:            }
082:
083:            /**
084:             * Returns the key compare for the column.
085:             */
086:            public KeyCompare getIndexKeyCompare() {
087:                return new IntKeyCompare();
088:            }
089:
090:            /**
091:             * Returns a String value from the column.
092:             *
093:             * @param block the block's buffer
094:             * @param rowOffset the offset of the row in the block
095:             */
096:            public String getString(byte[] block, int rowOffset) {
097:                if (isNull(block, rowOffset))
098:                    return null;
099:                else
100:                    return String.valueOf(getInteger(block, rowOffset));
101:            }
102:
103:            /**
104:             * Sets a string value in the column.
105:             *
106:             * @param block the block's buffer
107:             * @param rowOffset the offset of the row in the block
108:             * @param value the value to store
109:             */
110:            void setString(Transaction xa, byte[] block, int rowOffset,
111:                    String str) {
112:                if (str == null)
113:                    setNull(block, rowOffset);
114:                else
115:                    setInteger(xa, block, rowOffset, (int) Long.parseLong(str));
116:            }
117:
118:            /**
119:             * Returns a int value from the column.
120:             *
121:             * @param block the block's buffer
122:             * @param rowOffset the offset of the row in the block
123:             */
124:            public int getInteger(byte[] block, int rowOffset) {
125:                if (isNull(block, rowOffset))
126:                    return 0;
127:
128:                int offset = rowOffset + _columnOffset;
129:                int value = 0;
130:
131:                value = (block[offset++] & 0xff) << 24;
132:                value |= (block[offset++] & 0xff) << 16;
133:                value |= (block[offset++] & 0xff) << 8;
134:                value |= (block[offset++] & 0xff);
135:
136:                return value;
137:            }
138:
139:            /**
140:             * Sets an integer value in the column.
141:             *
142:             * @param block the block's buffer
143:             * @param rowOffset the offset of the row in the block
144:             * @param value the value to store
145:             */
146:            void setInteger(Transaction xa, byte[] block, int rowOffset,
147:                    int value) {
148:                int offset = rowOffset + _columnOffset;
149:
150:                block[offset++] = (byte) (value >> 24);
151:                block[offset++] = (byte) (value >> 16);
152:                block[offset++] = (byte) (value >> 8);
153:                block[offset++] = (byte) (value);
154:
155:                setNonNull(block, rowOffset);
156:            }
157:
158:            /**
159:             * Sets a long value in the column.
160:             *
161:             * @param block the block's buffer
162:             * @param rowOffset the offset of the row in the block
163:             * @param value the value to store
164:             */
165:            void setLong(Transaction xa, byte[] block, int rowOffset, long value) {
166:                setInteger(xa, block, rowOffset, (int) value);
167:            }
168:
169:            /**
170:             * Returns a long value from the column.
171:             *
172:             * @param block the block's buffer
173:             * @param rowOffset the offset of the row in the block
174:             */
175:            public long getLong(byte[] block, int rowOffset) {
176:                return getInteger(block, rowOffset);
177:            }
178:
179:            /**
180:             * Sets the column based on an expression.
181:             *
182:             * @param block the block's buffer
183:             * @param rowOffset the offset of the row in the block
184:             * @param expr the expression to store
185:             */
186:            void setExpr(Transaction xa, byte[] block, int rowOffset,
187:                    Expr expr, QueryContext context) throws SQLException {
188:                if (expr.isNull(null))
189:                    setNull(block, rowOffset);
190:                else
191:                    setInteger(xa, block, rowOffset, (int) expr
192:                            .evalLong(context));
193:            }
194:
195:            /**
196:             * Evaluates the column to a stream.
197:             */
198:            public void evalToResult(byte[] block, int rowOffset,
199:                    SelectResult result) {
200:                if (isNull(block, rowOffset)) {
201:                    result.writeNull();
202:                    return;
203:                }
204:
205:                int startOffset = rowOffset + _columnOffset;
206:
207:                result.write(Column.INT);
208:                result.write(block, startOffset, 4);
209:            }
210:
211:            /**
212:             * Evaluate to a buffer.
213:             *
214:             * @param block the block's buffer
215:             * @param rowOffset the offset of the row in the block
216:             * @param buffer the result buffer
217:             * @param buffer the result buffer offset
218:             *
219:             * @return the length of the value
220:             */
221:            int evalToBuffer(byte[] block, int rowOffset, byte[] buffer,
222:                    int bufferOffset) throws SQLException {
223:                if (isNull(block, rowOffset))
224:                    return 0;
225:
226:                int startOffset = rowOffset + _columnOffset;
227:                int len = 4;
228:
229:                System.arraycopy(block, startOffset, buffer, bufferOffset, len);
230:
231:                return len;
232:            }
233:
234:            /**
235:             * Returns true if the items in the given rows match.
236:             */
237:            public boolean isEqual(byte[] block1, int rowOffset1,
238:                    byte[] block2, int rowOffset2) {
239:                if (isNull(block1, rowOffset1) != isNull(block2, rowOffset2))
240:                    return false;
241:
242:                int startOffset1 = rowOffset1 + _columnOffset;
243:                int startOffset2 = rowOffset2 + _columnOffset;
244:
245:                return (block1[startOffset1 + 0] == block2[startOffset2 + 0]
246:                        && block1[startOffset1 + 1] == block2[startOffset2 + 1]
247:                        && block1[startOffset1 + 2] == block2[startOffset2 + 2] && block1[startOffset1 + 3] == block2[startOffset2 + 3]);
248:            }
249:
250:            /**
251:             * Sets any index for the column.
252:             *
253:             * @param block the block's buffer
254:             * @param rowOffset the offset of the row in the block
255:             * @param rowAddr the address of the row
256:             */
257:            void setIndex(Transaction xa, byte[] block, int rowOffset,
258:                    long rowAddr, QueryContext context) throws SQLException {
259:                BTree index = getIndex();
260:
261:                if (index == null)
262:                    return;
263:
264:                index.insert(block, rowOffset + _columnOffset, 4, rowAddr, xa,
265:                        false);
266:            }
267:
268:            /**
269:             * Sets based on an iterator.
270:             */
271:            public void set(TableIterator iter, Expr expr, QueryContext context)
272:                    throws SQLException {
273:                iter.setDirty();
274:                setInteger(iter.getTransaction(), iter.getBuffer(), iter
275:                        .getRowOffset(), (int) expr.evalLong(context));
276:            }
277:
278:            /**
279:             * Deleting the row, based on the column.
280:             *
281:             * @param block the block's buffer
282:             * @param rowOffset the offset of the row in the block
283:             * @param expr the expression to store
284:             */
285:            void delete(Transaction xa, byte[] block, int rowOffset)
286:                    throws SQLException {
287:                BTree index = getIndex();
288:
289:                if (index != null)
290:                    index.remove(block, rowOffset + _columnOffset, 4, xa);
291:            }
292:        }
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