001: /*
002: * $Id: ReplaceFunction.java,v 1.6 2005/03/05 01:35:35 ahimanikya Exp $
003: * =======================================================================
004: * Copyright (c) 2002-2005 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.types.StringType;
048:
049: /**
050: * @version $Revision: 1.6 $ $Date: 2005/03/05 01:35:35 $
051: * @author Sanjeeth Duvuru
052: * @author Ahimanikya Satapathy
053: */
054: public class ReplaceFunction extends BaseFunction implements
055: ScalarFunction, FunctionFactory {
056:
057: /** Creates a new instance of Class */
058: public ReplaceFunction() {
059: super ("REPLACE");
060: }
061:
062: public ConcreteFunction makeNewInstance() {
063: return new ReplaceFunction();
064: }
065:
066: /** {@link StringType} */
067: public DataType getDataType() {
068: return STRING_TYPE;
069: }
070:
071: public Object evaluate(RowDecorator row) throws AxionException {
072: Object val = getArgument(0).evaluate(row);
073: Object val1 = getArgument(1).evaluate(row);
074:
075: String s1 = (String) STRING_TYPE.convert(val);
076: String s2 = (String) STRING_TYPE.convert(val1);
077: int i2 = s2.length();
078:
079: if (getArgumentCount() == 3) {
080: Object val2 = getArgument(2).evaluate(row);
081: String s3 = (String) STRING_TYPE.convert(val2);
082: return replacedString(s1, s2, s3, i2);
083: } else {
084: return replacedString(s1, s2, "", i2);
085: }
086: }
087:
088: private String replacedString(String s1, String s2, String s3,
089: int i2) {
090: int i0 = s1.indexOf(s2);
091: if (i0 != -1) {
092: s1 = s1.substring(0, i0) + s3 + s1.substring(i0 + i2);
093: s1 = replacedString(s1, s2, s3, i2);
094: }
095: return s1;
096: }
097:
098: public boolean isValid() {
099: return (getArgumentCount() >= 2 && getArgumentCount() < 4);
100: }
101:
102: private static final DataType STRING_TYPE = new StringType();
103: }
|