package nl.tudelft.simulation.dsol.interpreter.operations; import java.io.DataInput; import java.io.IOException; import nl.tudelft.simulation.dsol.interpreter.InterpreterException; import nl.tudelft.simulation.dsol.interpreter.LocalVariable; import nl.tudelft.simulation.dsol.interpreter.OperandStack; import nl.tudelft.simulation.dsol.interpreter.classfile.Constant; import nl.tudelft.simulation.dsol.interpreter.classfile.ConstantClass; /** * The NEW operation as defined in * http://java.sun.com/docs/books/vmspec/2nd-edition/html/Instructions2.doc10.html . *
* (c) copyright 2002-2014 Delft University of Technology.
* BSD-style license. See DSOL License.
* @author Peter Jacobs
* @author Alexander Verbraeck
*/
public class NEW extends VoidOperation
{
/** OP refers to the operand code. */
public static final int OP = 187;
/** index refers to the constantpool index. */
private final int index;
/**
* constructs a new NEW.
* @param dataInput the dataInput
* @throws IOException on IOfailure
*/
public NEW(final DataInput dataInput) throws IOException
{
super();
this.index = dataInput.readUnsignedShort();
}
/** {@inheritDoc} */
@Override
public final void execute(final OperandStack stack, final Constant[] constantPool,
final LocalVariable[] localVariables)
{
try
{
Class> instanceClass = null;
instanceClass = ((ConstantClass) constantPool[this.index]).getValue().getClassValue();
stack.push(new UninitializedInstance(instanceClass));
}
catch (Exception exception)
{
throw new InterpreterException(exception);
}
}
/** {@inheritDoc} */
@Override
public final int getByteLength()
{
return OPCODE_BYTE_LENGTH + 2;
}
/** {@inheritDoc} */
@Override
public final int getOpcode()
{
return NEW.OP;
}
/**
* holder class for "to-be-constructed" instances.
*/
public static class UninitializedInstance
{
/** the value. */
private Class> instanceClass = null;
/**
* constructs a new UninitializedInstance.
* @param instanceClass the class of which an instance must be made
*/
public UninitializedInstance(final Class> instanceClass)
{
this.instanceClass = instanceClass;
}
/**
* @return return the instanceClass
*/
public final Class> getInstanceClass()
{
return this.instanceClass;
}
}
}