001: /*
002: * $Id: IsValidDateTimeFunction.java,v 1.5 2005/06/18 01:03:45 ahimanikya Exp $
003: * =======================================================================
004: * Copyright (c) 2004-2005 Axion Development Team. All rights reserved.
005: *
006: * Redistribution and use in source and binary forms, with or without
007: * modification, are permitted provided that the following conditions
008: * are met:
009: *
010: * 1. Redistributions of source code must retain the above
011: * copyright notice, this list of conditions and the following
012: * disclaimer.
013: *
014: * 2. Redistributions in binary form must reproduce the above copyright
015: * notice, this list of conditions and the following disclaimer in
016: * the documentation and/or other materials provided with the
017: * distribution.
018: *
019: * 3. The names "Tigris", "Axion", nor the names of its contributors may
020: * not be used to endorse or promote products derived from this
021: * software without specific prior written permission.
022: *
023: * 4. Products derived from this software may not be called "Axion", nor
024: * may "Tigris" or "Axion" appear in their names without specific prior
025: * written permission.
026: *
027: * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
028: * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
029: * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
030: * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
031: * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
032: * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
033: * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
034: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
035: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
036: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
037: * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
038: * =======================================================================
039: */
040:
041: package org.axiondb.functions;
042:
043: import org.axiondb.AxionException;
044: import org.axiondb.DataType;
045: import org.axiondb.FunctionFactory;
046: import org.axiondb.RowDecorator;
047: import org.axiondb.Selectable;
048: import org.axiondb.types.BooleanType;
049: import org.axiondb.types.StringType;
050: import org.axiondb.util.DateTimeUtils;
051:
052: /**
053: * Function to test whether the given String expression is in the same format as the given
054: * date format expression.
055: *
056: * @author Jonathan Giron
057: * @version $Revision: 1.5 $ $Date: 2005/06/18 01:03:45 $
058: */
059: public class IsValidDateTimeFunction extends BaseFunction implements
060: ScalarFunction, FunctionFactory {
061:
062: public IsValidDateTimeFunction() {
063: super ("ISVALIDDATETIME");
064: }
065:
066: public DataType getDataType() {
067: return BOOLEAN_TYPE;
068: }
069:
070: public boolean isValid() {
071: return getArgumentCount() == 2;
072: }
073:
074: public Object evaluate(RowDecorator row) throws AxionException {
075: String dateStr = null;
076: String formatStr = null;
077:
078: // Get 'format-literal'
079: Selectable sel = getArgument(1);
080: Object arg2 = sel.evaluate(row);
081: if (null == arg2) {
082: throw new AxionException(22004);
083: } else {
084: formatStr = (String) ARG2_TYPE.convert(arg2);
085: }
086:
087: // Get 'date-string'
088: sel = getArgument(0);
089: Object arg1 = sel.evaluate(row);
090:
091: if (null == arg1) {
092: return null;
093: } else {
094: dateStr = (String) ARG1_TYPE.convert(arg1);
095: }
096:
097: try {
098: DateTimeUtils.convertToTimestamp(dateStr, formatStr);
099: return Boolean.TRUE;
100: } catch (AxionException e) {
101: // Rethrow AxionException if formatStr is invalid (SQLSTATE 22007).
102: if ("22007".equals(e.getSQLState())) {
103: throw e;
104: }
105: return Boolean.FALSE;
106: }
107: }
108:
109: public ConcreteFunction makeNewInstance() {
110: return new IsValidDateTimeFunction();
111: }
112:
113: private static final DataType BOOLEAN_TYPE = new BooleanType();
114: private static final DataType ARG1_TYPE = new StringType();
115: private static final DataType ARG2_TYPE = new StringType();
116: }
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