/*

 * 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();

            format.apply(hc);

            header = hc.getHeader();

        }

        return header;

    }

    public String getRow() throws MonitorException {

        RowClosure rc = new RowClosure(vm);

        format.apply(rc);

        return rc.getRow();

    }

}