package nl.tudelft.simulation.dsol.interpreter.operations; import java.io.DataInput; import java.io.IOException; import nl.tudelft.simulation.dsol.interpreter.LocalVariable; import nl.tudelft.simulation.dsol.interpreter.OperandStack; import nl.tudelft.simulation.dsol.interpreter.classfile.Constant; /** * The IFNONNULL operation as defined in * http://java.sun.com/docs/books/vmspec/2nd-edition/html/Instructions2.doc6.html . *

* (c) copyright 2002-2014 Delft University of Technology.
* BSD-style license. See DSOL License.
* @author Peter Jacobs * @author Alexander Verbraeck */ public class IFNONNULL extends JumpOperation { /** OP refers to the operand code. */ public static final int OP = 199; /** the index to load. */ private final int offset; /** * constructs a new IFNONNULL. * @param dataInput the dataInput * @throws IOException on IOfailure */ public IFNONNULL(final DataInput dataInput) throws IOException { super(); this.offset = dataInput.readShort(); } /** {@inheritDoc} */ @Override public final int execute(final OperandStack stack, final Constant[] constantPool, final LocalVariable[] localVariables) { if (stack.pop() != null) { return this.offset; } return this.getByteLength(); } /** {@inheritDoc} */ @Override public final int getByteLength() { return OPCODE_BYTE_LENGTH + 2; } /** {@inheritDoc} */ @Override public final int getOpcode() { return IFNONNULL.OP; } }