1/*
2 * Copyright (c) 2004, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.  Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26package sun.tools.jstat;
27
28import java.text.*;
29import sun.jvmstat.monitor.*;
30
31/**
32 * A class implementing the Closure interface for iterating over the
33 * specified columns of data and generating the columnized string of
34 * data representing a row of output for the form.
35 *
36 * @author Brian Doherty
37 * @since 1.5
38 */
39public class RowClosure implements Closure {
40    private MonitoredVm vm;
41    private StringBuilder row = new StringBuilder();
42
43    public RowClosure(MonitoredVm vm) {
44        this.vm = vm;
45    }
46
47    public void visit(Object o, boolean hasNext) throws MonitorException {
48        if (! (o instanceof ColumnFormat)) {
49            return;
50        }
51
52        ColumnFormat c = (ColumnFormat)o;
53        String s = null;
54
55        Expression e = c.getExpression();
56        ExpressionEvaluator ee = new ExpressionExecuter(vm);
57        Object value = ee.evaluate(e);
58
59        if (value instanceof String) {
60            s = (String)value;
61        } else if (value instanceof Number) {
62            double d = ((Number)value).doubleValue();
63            double scaledValue = c.getScale().scale(d);
64            DecimalFormat df = new DecimalFormat(c.getFormat());
65            DecimalFormatSymbols syms = df.getDecimalFormatSymbols();
66            syms.setNaN("-");
67            df.setDecimalFormatSymbols(syms);
68            s = df.format(scaledValue);
69        }
70
71        c.setPreviousValue(value);
72        s = c.getAlignment().align(s, c.getWidth());
73        row.append(s);
74        if (hasNext) {
75            row.append(" ");
76        }
77    }
78
79    public String getRow() {
80        return row.toString();
81    }
82}
83