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package org.netbeans.lib.profiler.wireprotocol;

import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;


/**
 * This command is issued by the back end to signal that the root instrumentation class has been loaded.
 * It contains the information about all classes loaded by the target JVM by that time.
 *
 * @author Misha Dmitriev
 * @author Ian Formanek
 */
public class RootClassLoadedCommand extends Command {
    //~ Instance fields ----------------------------------------------------------------------------------------------------------

    private int[] allLoadedClassLoaderIds;
    private String[] allLoadedClassNames;
    private byte[][] cachedClassFileBytes;
    private int[] parentLoaderIds; // An index into this table is a loader id, and the value at this index is this loader's parent loader id.
    private int classCount;

    //~ Constructors -------------------------------------------------------------------------------------------------------------

    public RootClassLoadedCommand(String[] allLoadedClassNames, int[] loaderIds, byte[][] cachedClassFileBytes, int classCount,
                                  int[] parentLoaderIds) {
        super(ROOT_CLASS_LOADED);
        this.allLoadedClassNames = allLoadedClassNames;
        this.allLoadedClassLoaderIds = loaderIds;
        this.cachedClassFileBytes = cachedClassFileBytes;
        this.classCount = classCount;
        this.parentLoaderIds = parentLoaderIds;
    }

    // Custom serialization support
    RootClassLoadedCommand() {
        super(ROOT_CLASS_LOADED);
    }

    //~ Methods ------------------------------------------------------------------------------------------------------------------

    public int[] getAllLoadedClassLoaderIds() {
        return allLoadedClassLoaderIds;
    }

    public String[] getAllLoadedClassNames() {
        return allLoadedClassNames;
    }

    public byte[][] getCachedClassFileBytes() {
        byte[][] res = cachedClassFileBytes;
        cachedClassFileBytes = null; // Save memory

        return res;
    }

    public int[] getParentLoaderIds() {
        // Return a copy, just in case, since this instance of parentLoaderIds is reused when this command is received
        int[] newParentLoaderIds = new int[parentLoaderIds.length];
        System.arraycopy(parentLoaderIds, 0, newParentLoaderIds, 0, parentLoaderIds.length);

        return newParentLoaderIds;
    }

    // for debugging
    public String toString() {
        return super.toString();
    }

    void readObject(ObjectInputStream in) throws IOException {
        int len = in.readInt();
        allLoadedClassNames = new String[len];

        for (int i = 0; i < len; i++) {
            allLoadedClassNames[i] = in.readUTF();
        }

        allLoadedClassLoaderIds = new int[len];

        for (int i = 0; i < len; i++) {
            allLoadedClassLoaderIds[i] = in.readInt();
        }

        len = in.readInt();

        if (len == 0) {
            cachedClassFileBytes = null;
        } else {
            cachedClassFileBytes = new byte[len][];

            for (int i = 0; i < len; i++) {
                int bytesLen = in.readInt();

                if (bytesLen == 0) {
                    continue;
                } else {
                    cachedClassFileBytes[i] = new byte[bytesLen];
                    in.readFully(cachedClassFileBytes[i]);
                }
            }
        }

        len = in.readInt();
        parentLoaderIds = new int[len];

        for (int i = 0; i < len; i++) {
            parentLoaderIds[i] = in.readInt();
        }
    }

    void writeObject(ObjectOutputStream out) throws IOException {
        out.writeInt(classCount);

        for (int i = 0; i < classCount; i++) {
            out.writeUTF(allLoadedClassNames[i]);
        }

        for (int i = 0; i < classCount; i++) {
            int loaderId = allLoadedClassLoaderIds[i];

            // At the client side we treat classes loaded by the bootstrap and by the system classloaders in the same way
            if (loaderId == -1) {
                loaderId = 0;
            }

            out.writeInt(loaderId);
        }

        if (cachedClassFileBytes == null) {
            out.writeInt(0);
        } else {
            out.writeInt(classCount);

            for (int i = 0; i < classCount; i++) {
                if (cachedClassFileBytes[i] == null) {
                    out.writeInt(0);
                } else {
                    out.writeInt(cachedClassFileBytes[i].length);
                    out.write(cachedClassFileBytes[i]);
                }
            }
        }

        out.writeInt(parentLoaderIds.length);

        for (int i = 0; i < parentLoaderIds.length; i++) {
            out.writeInt(parentLoaderIds[i]);
        }

        // Free memory
        allLoadedClassNames = null;
        allLoadedClassLoaderIds = null;
        cachedClassFileBytes = null;
        parentLoaderIds = null;
    }
}
