Examples of com.sun.jdi.Value

com.sun.jdi.Value

The mirror for a value in the target VM. This interface is the root of a value hierarchy encompassing primitive values and object values.

Some examples of where values may be accessed:

{@link ObjectReference#getValue(com.sun.jdi.Field) ObjectReference.getValue(Field)} - value of a field
{@link StackFrame#getValue(com.sun.jdi.LocalVariable) StackFrame.getValue(LocalVariable)} - value of a variable
{@link VirtualMachine#mirrorOf(double) VirtualMachine.mirrorOf(double)} - created in the target VM by the JDI client
{@link com.sun.jdi.event.ModificationWatchpointEvent#valueToBe() ModificationWatchpointEvent.valueToBe()} - returned with an event

The following table illustrates which subinterfaces of Value are used to mirror values in the target VM --

Subinterfaces of {@link PrimitiveValue}
Kind of value	For example - expression in target	Is mirrored as an instance of	{@link Type} of value {@link #type() Value.type()}
a boolean	`true`	{@link BooleanValue}	{@link BooleanType}
a byte	`(byte)4`	{@link ByteValue}	{@link ByteType}
a char	`'a'`	{@link CharValue}	{@link CharType}
a double	`3.1415926`	{@link DoubleValue}	{@link DoubleType}
a float	`2.5f`	{@link FloatValue}	{@link FloatType}
an int	`22`	{@link IntegerValue}	{@link IntegerType}
a long	`1024L`	{@link LongValue}	{@link LongType}
a short	`(short)12`	{@link ShortValue}	{@link ShortType}
a void		{@link VoidValue}	{@link VoidType}
Subinterfaces of {@link ObjectReference}
Kind of value	For example - expression in target	Is mirrored as an instance of	{@link Type} of value {@link #type() Value.type()}
a class instance	`this`	{@link ObjectReference}	{@link ClassType}
an array	`new int[5]`	{@link ArrayReference}	{@link ArrayType}
a string	`"hello"`	{@link StringReference}	{@link ClassType}
a thread	`Thread.currentThread()`	{@link ThreadReference}	{@link ClassType}
a thread group	`Thread.currentThread() .getThreadGroup()`	{@link ThreadGroupReference}	{@link ClassType}
a `java.lang.Class` instance	`this.getClass()`	{@link ClassObjectReference}	{@link ClassType}
a class loader	`this.getClass() .getClassLoader()`	{@link ClassLoaderReference}	{@link ClassType}
Other
Kind of value	For example - expression in target	Is mirrored as	{@link Type} of value
null	`null`	`null`	n/a

@author Robert Field @author Gordon Hirsch @author James McIlree @since 1.3

   * each access we see if the value has changed and update if required.
   * 
   * @see IVariable#getValue()
   */
  public IValue getValue() throws DebugException {
    Value currentValue = getCurrentValue();
    if (fValue == null) {
      fValue = JDIValue.createValue((JDIDebugTarget) getDebugTarget(),
          currentValue);
    } else {
      Value previousValue = fValue.getUnderlyingValue();
      if (currentValue == previousValue) {
        return fValue;
      }
      if (previousValue == null || currentValue == null) {
        fValue = JDIValue.createValue(
            (JDIDebugTarget) getDebugTarget(), currentValue);
        setChangeCount(getJavaDebugTarget().getSuspendCount());
      } else if (!previousValue.equals(currentValue)) {
        fValue = JDIValue.createValue(
            (JDIDebugTarget) getDebugTarget(), currentValue);
        setChangeCount(getJavaDebugTarget().getSuspendCount());
      }
    }

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      methodImpl.write(this, outData);


      writeInt(checkedArguments.size(), "size", outData); //$NON-NLS-1$
      Iterator<Value> iter = checkedArguments.iterator();
      while (iter.hasNext()) {
        Value elt = iter.next();
        if (elt instanceof ValueImpl) {
          ((ValueImpl)elt).writeWithTag(this, outData);
        } else {
          ValueImpl.writeNullWithTag(this, outData);
        }

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      methodImpl.write(this, outData);


      writeInt(checkedArguments.size(), "size", outData); //$NON-NLS-1$
      Iterator<Value> iter = checkedArguments.iterator();
      while (iter.hasNext()) {
        Value elt = iter.next();
        if (elt instanceof ValueImpl) {
          checkVM(elt);
          ((ValueImpl)elt).writeWithTag(this, outData);
        } else {
          ValueImpl.writeNullWithTag(this, outData);

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      requestFailed(
          JDIDebugModelMessages.JDIModificationVariable_Unable_to_generate_value___VM_disconnected__1,
          null);
    }
    String signature = getJavaType().getSignature();
    Value vmValue = null;
    try {
      switch (signature.charAt(0)) {
      case 'Z':
        String flse = Boolean.FALSE.toString();
        String tre = Boolean.TRUE.toString();

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   * org.eclipse.debug.core.model.IValueModification#verifyValue(java.lang
   * .String)
   */
  @Override
  public boolean verifyValue(String expression) throws DebugException {
    Value vmValue = generateVMValue(expression);
    IValue value = JDIValue.createValue(getJavaDebugTarget(), vmValue);
    return verifyValue(value);
  }

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   * org.eclipse.debug.core.model.IValueModification#setValue(java.lang.String
   * )
   */
  @Override
  public final void setValue(String expression) throws DebugException {
    Value value = generateVMValue(expression);
    setJDIValue(value);
  }

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    int count = list.size();
    IJavaValue[] values = new IJavaValue[count];
    JDIDebugTarget target = (JDIDebugTarget) getDebugTarget();
    for (int i = 0; i < count; i++) {
      Value value = list.get(i);
      values[i] = JDIValue.createValue(target, value);
    }
    return values;
  }

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  /**
   * @see IJavaArray#getValue(int)
   */
  public IJavaValue getValue(int index) throws DebugException {
    Value v = getUnderlyingValue(index);
    return JDIValue.createValue((JDIDebugTarget) getDebugTarget(), v);
  }

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      }
    }
    int sizeNotThis = sizeAll - sizeThis;


    if (sizeThis > 0) {
      Value thisValue = thisObject();
      for (int i = 0; i < sizeAll; i++) {
        if (isThisValue[i]) {
          map.put(variables.get(i), thisValue);
        }
      }

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      if (field == null) {
        field = referenceType.fieldByName("isDaemon"); //$NON-NLS-1$
      }
      if (field != null) {
        if (field.signature().equals(Signature.SIG_BOOLEAN)) {
          Value value = getUnderlyingThread().getValue(field);
          if (value instanceof BooleanValue) {
            fIsDaemon = ((BooleanValue) value).booleanValue();
          }
        }
      }

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Related Classes of com.sun.jdi.Value

com.google.code.vimsztool.debug.eval.ExpEval

com.google.code.vimsztool.debug.ExpressionEval

org.drools.eclipse.debug.core.MVELStackFrame

org.eclipse.jdi.internal.ClassTypeImpl

org.eclipse.jdi.internal.StackFrameImpl

org.eclipse.jdi.internal.ValueImpl

org.eclipse.jdt.internal.debug.core.model.JDIArrayValue

org.eclipse.jdt.internal.debug.core.model.JDIClassType

org.eclipse.jdt.internal.debug.core.model.JDIDebugTarget

org.eclipse.jdt.internal.debug.core.model.JDIModificationVariable

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{@link ObjectReference#getValue(com.sun.jdi.Field) ObjectReference.getValue(Field)}	- value of a field
{@link StackFrame#getValue(com.sun.jdi.LocalVariable) StackFrame.getValue(LocalVariable)}	- value of a variable
{@link VirtualMachine#mirrorOf(double) VirtualMachine.mirrorOf(double)}	- created in the target VM by the JDI client
{@link com.sun.jdi.event.ModificationWatchpointEvent#valueToBe() ModificationWatchpointEvent.valueToBe()}	- returned with an event