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

  }


  public static Value findValueInFrame(ThreadReference threadRef, String name,
      ObjectReference thisObj, boolean hasParents)  {
    
    Value value = null;
    try {
      SuspendThreadStack threadStack = SuspendThreadStack.getInstance();
      StackFrame stackFrame = threadRef.frame(threadStack.getCurFrame());
      if (!hasParents) {
        LocalVariable localVariable;

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      }
      sb.deleteCharAt(sb.length() - 1);
      sb.append("]");
      return sb.toString();
    } else if (var instanceof ObjectReference) {
      Value strValue = invoke((ObjectReference) var, "toString",
          new ArrayList());
      return strValue.toString();
    } else {
      return var.toString();
    }
  }

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  }
  
  public static Value invoke(Object invoker, String methodName, List args) {
    SuspendThreadStack threadStack = SuspendThreadStack.getInstance();
    ThreadReference threadRef = threadStack.getCurThreadRef();
    Value value = null;
    Method matchedMethod = null;
    List<Method> methods = null;
    ClassType refType = null;
    ObjectReference obj  = null;
    if (invoker instanceof ClassType) {

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    }
    Iterator typeIter = argTypes.iterator();
    Iterator valIter = arguments.iterator();
    while (typeIter.hasNext()) {
      Type argType = (Type) typeIter.next();
      Value value = (Value) valIter.next();
      if (value == null) {
        if (isPrimitiveType(argType.name()))
          return false;
      }
      if (!value.type().equals(argType)) {
        if (isAssignableTo(value.type(), argType)) {
          return true;
        } else {
          return false;
        }
      }

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      ParseResult result = AstTreeFactory.getExpressionAst(exp);
      if (result.hasError()) {
        return result.getErrorMsg();
      }
      Object obj = evalTreeNode(result.getTree());
      Value value = null;
      if (obj instanceof Integer) {
        value = vm.mirrorOf(((Integer)obj).intValue());
      } else if (obj instanceof Boolean) {
        value = vm.mirrorOf(((Boolean)obj).booleanValue());
      } else if (obj instanceof String) {

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      for (LocalVariable var : threadRef.frame(curFrame).visibleVariables()) {
        varNames.add(var.name());
      }
      int maxLen = getMaxLength(varNames)+2;
      for (LocalVariable var : threadRef.frame(curFrame).visibleVariables()) {
        Value value = threadRef.frame(curFrame).getValue(var);
        sb.append(padStr(maxLen,var.name())).append(":");
        sb.append(getPrettyPrintStr(value));
        sb.append("\n");
      }
    } catch (AbsentInformationException e) {

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  public static String reftype(String exp) {
    ParseResult result = AstTreeFactory.getExpressionAst(exp);
    if (result.hasError()) {
      return result.getErrorMsg();
    }
    Value value = (Value)evalTreeNode(result.getTree());
    return value.type().name();
  }

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  public static String inspect(String exp) {
    ParseResult result = AstTreeFactory.getExpressionAst(exp);
    if (result.hasError()) {
      return result.getErrorMsg();
    }
    Value value = (Value)evalTreeNode(result.getTree());
    
    StringBuilder sb = new StringBuilder();
    if (value instanceof ObjectReference) {
      sb.append(exp).append(" = ");
      sb.append(value.type().name()).append("\n");
      
      ObjectReference objRef = (ObjectReference) value;
      Map<Field, Value> values = objRef.getValues(objRef.referenceType().visibleFields());
      List<String> fieldNames = new ArrayList<String>();
      for (Field field : values.keySet()) {

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    ThreadReference threadRef = checkAndGetCurrentThread();
    try {
      SuspendThreadStack threadStack = SuspendThreadStack.getInstance();
      StackFrame stackFrame = threadRef.frame(threadStack.getCurFrame());
      ObjectReference thisObj = stackFrame.thisObject();
      Value value = findValueInFrame(threadRef, name, thisObj);
      return value;
    } catch (IncompatibleThreadStateException e) {
      throw new ExpressionEvalException("eval expression error, caused by : " + e.getMessage());
    }
  }

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    ThreadReference threadRef = checkAndGetCurrentThread();
    ObjectReference thisObj = null;
    
    try {
      thisObj = (ObjectReference)evalTreeNode(objNode);
      Value value = findValueInFrame(threadRef, memberName, thisObj);
      return value;
    } catch (VariableOrFieldNotFoundException e) {
      ReferenceType refType = getClassType(objNode.getText());
      Field field = refType.fieldByName(memberName);
      Value value = refType.getValue(field);
      return value;
    }
    
  }

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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