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package com.oracle.graal.python.builtins.objects.itertools;

import static com.oracle.graal.python.builtins.objects.itertools.TeeDataObjectBuiltins.LINKCELLS;
import static com.oracle.graal.python.nodes.ErrorMessages.CANNOT_REENTER_TEE_ITERATOR;

import com.oracle.graal.python.builtins.PythonBuiltinClassType;
import com.oracle.graal.python.builtins.modules.BuiltinFunctions;
import com.oracle.graal.python.builtins.objects.PNone;
import com.oracle.graal.python.builtins.objects.object.PythonBuiltinObject;
import com.oracle.graal.python.nodes.PNodeWithRaise;
import com.oracle.graal.python.runtime.object.PythonObjectFactory;
import com.oracle.truffle.api.frame.VirtualFrame;
import com.oracle.truffle.api.object.Shape;

public final class PTeeDataObject extends PythonBuiltinObject {
    private Object it;
    private Object[] values;
    private int numread;
    private boolean running;
    private PTeeDataObject nextlink;

    public PTeeDataObject(Object cls, Shape instanceShape) {
        super(cls, instanceShape);
    }

    public PTeeDataObject(Object it, Object cls, Shape instanceShape) {
        super(cls, instanceShape);
        this.it = it;
        this.values = new Object[LINKCELLS];
        this.numread = 0;
        this.running = false;
        this.nextlink = null;
    }

    public Object getIt() {
        return it;
    }

    public void setIt(Object it) {
        this.it = it;
    }

    public Object[] getValues() {
        return values;
    }

    public void setValues(Object[] values) {
        this.values = values;
    }

    public int getNumread() {
        return numread;
    }

    public void setNumread(int numread) {
        this.numread = numread;
    }

    public boolean getRunning() {
        return running;
    }

    public void setRunning(boolean running) {
        this.running = running;
    }

    public PTeeDataObject getNextlink() {
        return nextlink;
    }

    public void setNextlink(PTeeDataObject nextlink) {
        this.nextlink = nextlink;
    }

    PTeeDataObject jumplink(PythonObjectFactory factory) {
        if (getNextlink() == null) {
            PTeeDataObject dataObj = factory.createTeeDataObject(getIt());
            nextlink = dataObj;
        }
        return nextlink;
    }

    Object getItem(VirtualFrame frame, int i, BuiltinFunctions.NextNode nextNode, PNodeWithRaise node) {
        assert i < TeeDataObjectBuiltins.LINKCELLS;
        if (i < numread) {
            return values[i];
        } else {
            assert i == numread;
            if (running) {
                throw node.raise(PythonBuiltinClassType.RuntimeError, CANNOT_REENTER_TEE_ITERATOR);
            }

            running = true;
            Object value;
            try {
                value = nextNode.execute(frame, it, PNone.NO_VALUE);
            } finally {
                running = false;
            }
            values[numread++] = value;
            return value;
        }
    }
}
