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VisualVM snapshot support for SJK
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/**
 * Copyright 2017 Alexey Ragozin
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.gridkit.jvmtool.nps.parser;

import java.io.ByteArrayInputStream;
import java.io.DataInputStream;
import java.io.IOException;
import java.io.InputStream;

import org.gridkit.jvmtool.event.Event;
import org.gridkit.jvmtool.event.EventDumpParser;
import org.gridkit.jvmtool.event.EventReader;
import org.netbeans.lib.profiler.results.ResultsSnapshot;
import org.netbeans.lib.profiler.results.cpu.CPUResultsSnapshot;
import org.netbeans.modules.profiler.LoadedSnapshot;

public class NetbeansSnapshotParser implements EventDumpParser {

    public boolean isFunctional() {
        return true;
    }

    public NetbeansSnapshotParser() {
        try {
            // force class loading
            open(new InputStreamSource() {

                @Override
                public InputStream open() throws IOException {
                    return new ByteArrayInputStream(new byte[0]);
                }
            });
        }
        catch(Exception e) {
            // ignore
        }
        catch(Error e) {
            // ignore
        }
    }

    @Override
    public EventReader open(InputStreamSource source) throws IOException {

        ClassLoader contextCl = Thread.currentThread().getContextClassLoader();
        try {
            Thread.currentThread().setContextClassLoader(this.getClass().getClassLoader());

            LoadedSnapshot snapshot = LoadedSnapshot.loadSnapshot(new DataInputStream(source.open()));
            ResultsSnapshot snap = snapshot.getSnapshot();
            if (snap instanceof CPUResultsSnapshot) {
                EventReader adapter = new DirectNpsEventAdapter((CPUResultsSnapshot) snap);
//                EventReader adapter = new NpsEventAdapter((CPUResultsSnapshot) snap);
                if (!adapter.hasNext()) {
                    return null;
                }
                return adapter;
            }
        }
        catch(NoSuchMethodError e) {
            e.printStackTrace();
            // classpath problem
        }
        catch(NoClassDefFoundError e) {
            e.printStackTrace();
            // classpath problem
        }
        finally {
            Thread.currentThread().setContextClassLoader(contextCl);
        }
        return null;
    }
}