/*

 * Copyright 2004 Sun Microsystems, Inc.  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.  Sun designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

 * have any questions.

 */

package sun.tools.jstat;

import java.text.*;

import sun.jvmstat.monitor.*;

/**

 * A class implementing the Closure interface for iterating over the

 * specified columns of data and generating the columnized string of

 * data representing a row of output for the form.

 *

 * @author Brian Doherty

 * @since 1.5

 */

public class RowClosure implements Closure {

    private MonitoredVm vm;

    private StringBuilder row = new StringBuilder();

    public RowClosure(MonitoredVm vm) {

        this.vm = vm;

    }

    public void visit(Object o, boolean hasNext) throws MonitorException {

        if (! (o instanceof ColumnFormat)) {

            return;

        }

        ColumnFormat c = (ColumnFormat)o;

        String s = null;

        Expression e = c.getExpression();

        ExpressionEvaluator ee = new ExpressionExecuter(vm);

        Object value = ee.evaluate(e);

        if (value instanceof String) {

            s = (String)value;

        } else if (value instanceof Number) {

            double d = ((Number)value).doubleValue();

            double scaledValue = c.getScale().scale(d);

            DecimalFormat df = new DecimalFormat(c.getFormat());

            s = df.format(scaledValue);

        }

        c.setPreviousValue(value);

        s = c.getAlignment().align(s, c.getWidth());

        row.append(s);

        if (hasNext) {

            row.append(" ");

        }

    }

    public String getRow() {

        return row.toString();

    }

}