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 8, 2005
19: *
20: */
21: package org.apache.poi.hssf.record.formula.eval;
22:
23: import org.apache.poi.hssf.record.formula.ConcatPtg;
24: import org.apache.poi.hssf.record.formula.Ptg;
25:
26: /**
27: * @author Amol S. Deshmukh < amolweb at ya hoo dot com >
28: *
29: */
30: public class ConcatEval extends StringOperationEval {
31:
32: private ConcatPtg delegate;
33:
34: public ConcatEval(Ptg ptg) {
35: this .delegate = (ConcatPtg) ptg;
36: }
37:
38: public Eval evaluate(Eval[] operands, int srcRow, short srcCol) {
39: Eval retval = null;
40: StringBuffer sb = null;
41:
42: switch (operands.length) {
43: default: // paranoid check :)
44: retval = ErrorEval.UNKNOWN_ERROR;
45: break;
46: case 2:
47: sb = new StringBuffer();
48: for (int i = 0, iSize = 2; retval == null && i < iSize; i++) {
49:
50: ValueEval ve = singleOperandEvaluate(operands[i],
51: srcRow, srcCol);
52: if (ve instanceof StringValueEval) {
53: StringValueEval sve = (StringValueEval) ve;
54: sb.append(sve.getStringValue());
55: } else if (ve instanceof BlankEval) {
56: // do nothing
57: } else { // must be an error eval
58: retval = ve;
59: }
60: }
61: }
62:
63: if (retval == null) {
64: retval = new StringEval(sb.toString());
65: }
66: return retval;
67: }
68:
69: public int getNumberOfOperands() {
70: return delegate.getNumberOfOperands();
71: }
72:
73: public int getType() {
74: return delegate.getType();
75: }
76: }
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