JDK8/Java8源码在线阅读

/*
 * Copyright (c) 2004, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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package sun.tools.jstat;

import sun.jvmstat.monitor.*;

/**
 * A class for applying an OptionFormat to a particular context, the context
 * of the available Instrumentation for a monitorable Java Virtual Machine.
 *
 * @author Brian Doherty
 * @since 1.5
 */
public class OptionOutputFormatter implements OutputFormatter {
    private OptionFormat format;
    private String header;
    private MonitoredVm vm;

    public OptionOutputFormatter(MonitoredVm vm, OptionFormat format)
           throws MonitorException {
        this.vm = vm;
        this.format = format;
        resolve();
    }

    private void resolve() throws MonitorException {
        ExpressionEvaluator ee = new ExpressionResolver(vm);
        SymbolResolutionClosure ec = new SymbolResolutionClosure(ee);
        format.apply(ec);
    }

    public String getHeader() throws MonitorException {
        if (header == null) {
            HeaderClosure hc = new HeaderClosure();

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