001: /*
002: * $Id: RTrimFunction.java,v 1.7 2005/05/02 22:28:41 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: 1.7 $ $Date: 2005/05/02 22:28:41 $
051: * @author Sudhendra Seshachala
052: * @author Ahimanikya Satapathy
053: */
054: public class RTrimFunction extends BaseFunction implements
055: ScalarFunction, FunctionFactory {
056:
057: /** Creates a new instance of Class */
058: public RTrimFunction() {
059: super ("RTRIM");
060: }
061:
062: public ConcreteFunction makeNewInstance() {
063: return new RTrimFunction();
064: }
065:
066: /** {@link StringType} */
067: public DataType getDataType() {
068: return RETURN_TYPE;
069: }
070:
071: public Object evaluate(RowDecorator row) throws AxionException {
072: char trimChar = ' '; // default trim char
073: if (getArgumentCount() == 2) {
074: Object trimCharObj = getArgument(1).evaluate(row);
075: String trimCharStr = (String) RETURN_TYPE
076: .convert(trimCharObj);
077: if (trimCharStr != null && trimCharStr.length() > 0) {
078: trimChar = trimCharStr.charAt(0);
079: }
080: }
081:
082: Object trimSourceObj = getArgument(0).evaluate(row);
083: String trimSourceStr = (String) RETURN_TYPE
084: .convert(trimSourceObj);
085: int trimSourceLen = trimSourceStr.length();
086: int i, len = trimSourceLen - 1;
087:
088: for (i = len; i > 0 && trimSourceStr.charAt(i) == trimChar; i--)
089: ;
090: trimSourceStr = (i == len) ? trimSourceStr : trimSourceStr
091: .substring(0, i + 1);
092: return trimSourceStr;
093: }
094:
095: public boolean isValid() {
096: return (getArgumentCount() >= 1 && getArgumentCount() < 3);
097: }
098:
099: private static final DataType RETURN_TYPE = new StringType();
100: }
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