Examples of com.sun.jdi.Type

com.sun.jdi.Type

The mirror for a type in the target VM. This interface is the root of a type hierarchy encompassing primitive types and reference types.

A Type may be used to represent a run-time type:

{@link Value}.type()

or a compile-time type:

{@link Field#type()}
{@link Method#returnType()}
{@link Method#argumentTypes()}
{@link LocalVariable#type()}
{@link ArrayType#componentType()}

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

Subinterfaces of {@link PrimitiveType}
Type declared in target as		Is mirrored as an instance of
`boolean`		{@link BooleanType}
`byte`		{@link ByteType}
`char`		{@link CharType}
`double`		{@link DoubleType}
`float`		{@link FloatType}
`int`		{@link IntegerType}
`long`		{@link LongType}
`short`		{@link ShortType}
`void`		{@link VoidType}
Subinterfaces of {@link ReferenceType}
Type declared in target as	For example	Is mirrored as an instance of
a class	`Date`	{@link ClassType}
an interface	`Runnable`	{@link InterfaceType}
an array		{@link ArrayType}
an array	`int[]`	{@link ArrayType} whose{@link ArrayType#componentType() componentType()} is{@link IntegerType}
an array	`Date[]`	{@link ArrayType} whose{@link ArrayType#componentType() componentType()} is{@link ClassType}
an array	`Runnable[]`	{@link ArrayType} whose{@link ArrayType#componentType() componentType()} is{@link InterfaceType}

@see PrimitiveType Subinterface PrimitiveType @see ReferenceType Subinterface ReferenceType @see Value Value - for relationship between Type and Value @see Field#type() Field.type() - for usage examples @author Robert Field @author Gordon Hirsch @author James McIlree @since 1.3

      return false;
    }
    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;

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  }


  static boolean isArrayAssignableTo(ArrayType fromType, Type toType) {
    if (toType instanceof ArrayType) {
      try {
        Type toComponentType = ((ArrayType) toType).componentType();
        return isComponentAssignable(fromType.componentType(),
            toComponentType);
      } catch (ClassNotLoadedException e) {
        return false;
      }

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      return false;
    }
    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;

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  }


  static boolean isArrayAssignableTo(ArrayType fromType, Type toType) {
    if (toType instanceof ArrayType) {
      try {
        Type toComponentType = ((ArrayType) toType).componentType();
        return isComponentAssignable(fromType.componentType(),
            toComponentType);
      } catch (ClassNotLoadedException e) {
        return false;
      }

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      String genericSignature = getLocal().genericSignature();
      if (genericSignature != null) {
        return JDIReferenceType.getTypeName(genericSignature);
      }
      try {
        Type underlyingType = getUnderlyingType();
        if (underlyingType instanceof ReferenceType) {
          return JDIReferenceType
              .getGenericName((ReferenceType) underlyingType);
        }
      } catch (DebugException e) {

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  static public String getGenericName(ReferenceType type)
      throws DebugException {
    if (type instanceof ArrayType) {
      try {
        Type componentType;
        componentType = ((ArrayType) type).componentType();
        if (componentType instanceof ReferenceType) {
          return getGenericName((ReferenceType) componentType) + "[]"; //$NON-NLS-1$
        }
        return type.name();

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   * @see org.eclipse.jdt.debug.core.IJavaReferenceType#getInstanceCount()
   */
  public long getInstanceCount() throws DebugException {
    JDIDebugTarget target = getJavaDebugTarget();
    if (target.supportsInstanceRetrieval()) {
      Type type = getUnderlyingType();
      if(type instanceof ReferenceType) {
        ArrayList<ReferenceType> list = new ArrayList<ReferenceType>(2);
        list.add((ReferenceType) type);
        VirtualMachine vm = getVM();
        try {

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  /**
   * Build source for a class type (static context)
   */
  public void buildSourceStatic(IJavaReferenceType type) {
    Type underlyingType = ((JDIReferenceType) type).getUnderlyingType();
    if (!(underlyingType instanceof ReferenceType)) {
      return;
    }
    ReferenceType refType = (ReferenceType) underlyingType;
    fSource = buildTypeDeclaration(refType, buildRunMethod(refType), null,

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   * @see org.eclipse.jdt.debug.core.IJavaValue#getGenericSignature()
   */
  public String getGenericSignature() throws DebugException {
    try {
      if (fValue != null) {
        Type type = fValue.type();
        if (type instanceof ReferenceType) {
          return ((ReferenceType) type).genericSignature();
        }
        return null;
      }

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    List<Value> result = new ArrayList<Value>(values.size());
    Iterator<? extends Value> iterValues = values.iterator();
    Iterator<Type> iterTypes = types.iterator();
    while (iterValues.hasNext()) {
      Value value = iterValues.next();
      Type type = iterTypes.next();
      result.add(checkValue(value, type, vm));
    }
    return result;
  }

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