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10 package nl.tudelft.simulation.dsol.interpreter.operations;
11
12 import java.io.DataInput;
13 import java.io.IOException;
14
15 import nl.tudelft.simulation.dsol.interpreter.InterpreterException;
16 import nl.tudelft.simulation.dsol.interpreter.LocalVariable;
17 import nl.tudelft.simulation.dsol.interpreter.OperandStack;
18 import nl.tudelft.simulation.dsol.interpreter.classfile.Constant;
19 import nl.tudelft.simulation.dsol.interpreter.classfile.ConstantClass;
20
21 /***
22 * The NEW operation as defined in <a
23 * href="http://java.sun.com/docs/books/vmspec/2nd-edition/html/Instructions2.doc10.html">
24 * http://java.sun.com/docs/books/vmspec/2nd-edition/html/Instructions2.doc10.html
25 * </a>.
26 * <p>
27 * (c) copyright 2003 <a href="http://www.simulation.tudelft.nl">Delft
28 * University of Technology </a>, the Netherlands. <br>
29 * See for project information <a
30 * href="http://www.simulation.tudelft.nl">www.simulation.tudelft.nl </a> <br>
31 * License of use: <a href="http://www.gnu.org/copyleft/gpl.html">General Public
32 * License (GPL) </a>, no warranty <br>
33 *
34 * @author <a href="http://www.tbm.tudelft.nl/webstaf/peterja/index.htm">Peter
35 * Jacobs </a><a
36 * href="http://www.tbm.tudelft.nl/webstaf/alexandv/index.htm">Alexander
37 * Verbraeck </a>
38 * @version 1.3 Apr 6, 2004
39 * @since 1.4
40 */
41 public class NEW extends VoidOperation
42 {
43 /*** OP refers to the operand code */
44 public static final int OP = 187;
45
46 /*** index refers to the constantpool index */
47 private int index = -1;
48
49 /***
50 * constructs a new NEW
51 *
52 * @param dataInput the dataInput
53 * @throws IOException on IOfailure
54 */
55 public NEW(final DataInput dataInput) throws IOException
56 {
57 super();
58 this.index = dataInput.readUnsignedShort();
59 }
60
61 /***
62 * @see nl.tudelft.simulation.dsol.interpreter.operations.VoidOperation#execute(
63 * nl.tudelft.simulation.dsol.interpreter.OperandStack,
64 * nl.tudelft.simulation.dsol.interpreter.classfile.Constant[],
65 * nl.tudelft.simulation.dsol.interpreter.LocalVariable[])
66 */
67 public void execute(final OperandStack stack,
68 final Constant[] constantPool, final LocalVariable[] localVariables)
69 {
70 try
71 {
72 Class instanceClass = ((ConstantClass) constantPool[this.index])
73 .getValue().getClassValue();
74 stack.push(new UninitializedInstance(instanceClass));
75 } catch (Exception exception)
76 {
77 throw new InterpreterException(exception);
78 }
79 }
80
81 /***
82 * @see nl.tudelft.simulation.dsol.interpreter.Operation#getByteLength()
83 */
84 public int getByteLength()
85 {
86 return OPCODE_BYTE_LENGTH + 2;
87 }
88
89 /***
90 * @see nl.tudelft.simulation.dsol.interpreter.Operation#getOpcode()
91 */
92 public int getOpcode()
93 {
94 return NEW.OP;
95 }
96
97 /***
98 * holder class for "to-be-constructed" instances
99 */
100 public static class UninitializedInstance
101 {
102 /*** the value */
103 private Class instanceClass = null;
104
105 /***
106 * constructs a new UninitializedInstance
107 *
108 * @param instanceClass the class of which an instance must be made
109 */
110 public UninitializedInstance(final Class instanceClass)
111 {
112 this.instanceClass = instanceClass;
113 }
114
115 /***
116 * @return return the instanceClass
117 */
118 public Class getInstanceClass()
119 {
120 return this.instanceClass;
121 }
122 }
123 }