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 

    26 package sun.tools.jstat;

    27 

    28 import java.text.*;

    29 import 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  */

    39 public 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 }