01: /*
02: * Licensed to the Apache Software Foundation (ASF) under one or more
03: * contributor license agreements. See the NOTICE file distributed with
04: * this work for additional information regarding copyright ownership.
05: * The ASF licenses this file to You under the Apache License, Version 2.0
06: * (the "License"); you may not use this file except in compliance with
07: * the License. You may obtain a copy of the License at
08: *
09: * http://www.apache.org/licenses/LICENSE-2.0
10: *
11: * Unless required by applicable law or agreed to in writing, software
12: * distributed under the License is distributed on an "AS IS" BASIS,
13: * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14: * See the License for the specific language governing permissions and
15: * limitations under the License.
16: */
17: /*
18: * Created on May 15, 2005
19: *
20: */
21: package org.apache.poi.hssf.record.formula.functions;
22:
23: import org.apache.poi.hssf.record.formula.eval.BlankEval;
24: import org.apache.poi.hssf.record.formula.eval.ErrorEval;
25: import org.apache.poi.hssf.record.formula.eval.Eval;
26: import org.apache.poi.hssf.record.formula.eval.StringEval;
27: import org.apache.poi.hssf.record.formula.eval.StringValueEval;
28: import org.apache.poi.hssf.record.formula.eval.ValueEval;
29:
30: /**
31: * @author Amol S. Deshmukh < amolweb at ya hoo dot com >
32: *
33: */
34: public class Concatenate extends TextFunction {
35:
36: public Eval evaluate(Eval[] operands, int srcCellRow,
37: short srcCellCol) {
38: ValueEval retval = null;
39: StringBuffer sb = new StringBuffer();
40:
41: for (int i = 0, iSize = operands.length; i < iSize; i++) {
42: ValueEval ve = singleOperandEvaluate(operands[i],
43: srcCellRow, srcCellCol);
44: if (ve instanceof StringValueEval) {
45: StringValueEval sve = (StringValueEval) ve;
46: sb.append(sve.getStringValue());
47: } else if (ve instanceof BlankEval) {
48: } else {
49: retval = ErrorEval.VALUE_INVALID;
50: break;
51: }
52: }
53:
54: if (retval == null) {
55: retval = new StringEval(sb.toString());
56: }
57:
58: return retval;
59: }
60: }
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