/*
 * Copyright 2012-2014 Red Hat, Inc.
 *
 * This file is part of Thermostat.
 *
 * Thermostat is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published
 * by the Free Software Foundation; either version 2, or (at your
 * option) any later version.
 *
 * Thermostat 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 for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Thermostat; see the file COPYING.  If not see
 * <http://www.gnu.org/licenses/>.
 *
 * Linking this code with other modules is making a combined work
 * based on this code.  Thus, the terms and conditions of the GNU
 * General Public License cover the whole combination.
 *
 * As a special exception, the copyright holders of this code give
 * you permission to link this code with independent modules to
 * produce an executable, regardless of the license terms of these
 * independent modules, and to copy and distribute the resulting
 * executable under terms of your choice, provided that you also
 * meet, for each linked independent module, the terms and conditions
 * of the license of that module.  An independent module is a module
 * which is not derived from or based on this code.  If you modify
 * this code, you may extend this exception to your version of the
 * library, but you are not obligated to do so.  If you do not wish
 * to do so, delete this exception statement from your version.
 */

package com.redhat.thermostat.vm.heap.analysis.command.internal;

import com.redhat.thermostat.common.cli.Arguments;
import com.redhat.thermostat.common.cli.CommandContext;
import com.redhat.thermostat.common.cli.CommandException;
import com.redhat.thermostat.vm.heap.analysis.common.HeapDAO;
import com.redhat.thermostat.vm.heap.analysis.common.HeapDump;
import com.redhat.thermostat.vm.heap.analysis.common.model.HeapInfo;
import com.sun.tools.hat.internal.model.JavaHeapObject;

public class ObjectCommandHelper {

    private static final String OBJECT_ID_ARG = "objectId";
    private static final String HEAP_ID_ARG = "heapId";

    private CommandContext ctx;
    private HeapDAO dao;
    private HeapDump heapDump;

    public ObjectCommandHelper(CommandContext ctx, HeapDAO dao) {
        this.ctx = ctx;
        this.dao = dao;
    }

    public HeapDump getHeapDump() throws CommandException {
        if (heapDump == null) {
            loadHeapDump();
        }
        return heapDump;
    }

    private void loadHeapDump() throws CommandException {
        Arguments args = ctx.getArguments();
        String heapId = args.getArgument(HEAP_ID_ARG);
        HeapInfo heapInfo = dao.getHeapInfo(heapId);
        if (heapInfo == null) {
            throw new HeapNotFoundException(heapId);
        }
        heapDump = dao.getHeapDump(heapInfo);
    }

    public JavaHeapObject getJavaHeapObject() throws CommandException {
        HeapDump heapDump = getHeapDump();
        Arguments args = ctx.getArguments();
        String objectId = args.getArgument(OBJECT_ID_ARG);
        JavaHeapObject obj = heapDump.findObject(objectId);
        if (obj == null) {
            throw new ObjectNotFoundException(objectId);
        }
        return obj;
    }
}