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25 
26 package sun.tools.jstat;
27 
28 import sun.jvmstat.monitor.*;
29 
30 /**
31  * A class for applying an OptionFormat to a particular context, the context
32  * of the available Instrumentation for a monitorable Java Virtual Machine.
33  *
34  * @author Brian Doherty
35  * @since 1.5
36  */
37 public class OptionOutputFormatter implements OutputFormatter {
38     private OptionFormat format;
39     private String header;
40     private MonitoredVm vm;
41 
OptionOutputFormatter(MonitoredVm vm, OptionFormat format)42     public OptionOutputFormatter(MonitoredVm vm, OptionFormat format)
43            throws MonitorException {
44         this.vm = vm;
45         this.format = format;
46         resolve();
47     }
48 
resolve()49     private void resolve() throws MonitorException {
50         ExpressionEvaluator ee = new ExpressionResolver(vm);
51         SymbolResolutionClosure ec = new SymbolResolutionClosure(ee);
52         format.apply(ec);
53     }
54 
getHeader()55     public String getHeader() throws MonitorException {
56         if (header == null) {
57             HeaderClosure hc = new HeaderClosure();
58             format.apply(hc);
59             header = hc.getHeader();
60         }
61         return header;
62     }
63 
getRow()64     public String getRow() throws MonitorException {
65         RowClosure rc = new RowClosure(vm);
66         format.apply(rc);
67         return rc.getRow();
68     }
69 }
70