com.packenius.datadivider.javaclass.attr.StackMapFrame Maven / Gradle / Ivy

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package com.packenius.datadivider.javaclass.attr;

import com.packenius.dumpapi.DumpBlock;
import com.packenius.dumpapi.DumpReader;

/**
 * @author Christian Packenius, 2016.
 */
public abstract class StackMapFrame extends DumpBlock {
    /**
     * Konstruktor.
     */
    public StackMapFrame(DumpReader reader) {
        super(reader);
    }

    /**
     * @return Einzelner StackMapFrame.
     */
    public static StackMapFrame getNextStackMapFrame(DumpReader reader) {
        int tag = reader.getCurrentByte() & 255;
        if (tag <= 63) {
            return new StackMap_SameFrame(reader);
        }
        if (tag <= 127) {
            return new StackMap_SameLocals1StackItemFrame(reader);
        }
        if (tag <= 246) {
            throw new RuntimeException("StackMapFrame " + tag + " reserved for future use!");
        }
        if (tag == 247) {
            return new StackMap_SameLocals1StackItemFrameExtended(reader);
        }
        if (tag <= 250) {
            return new StackMap_ChopFrame(reader);
        }
        if (tag == 251) {
            return new StackMap_SameFrameExtended(reader);
        }
        if (tag <= 254) {
            return new StackMap_AppendFrame(reader);
        }
        if (tag == 255) {
            return new StackMap_FullFrame(reader);
        }
        throw new RuntimeException("Unbekanntes tag-Byte: " + tag);
    }

    @Override
    public String toString() {
        return "Stack Map Frame";
    }
}