JDK8/Java8源码在线阅读
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
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package javax.management.openmbean;
import java.io.ObjectStreamException;
import java.lang.reflect.Array;
/**
* The <code>ArrayType</code> class is the <i>open type</i> class whose instances describe
* all <i>open data</i> values which are n-dimensional arrays of <i>open data</i> values.
* <p>
* Examples of valid {@code ArrayType} instances are:
* <pre>{@code
* // 2-dimension array of java.lang.String
* ArrayType<String[][]> a1 = new ArrayType<String[][]>(2, SimpleType.STRING);
*
* // 1-dimension array of int
* ArrayType<int[]> a2 = new ArrayType<int[]>(SimpleType.INTEGER, true);
*
* // 1-dimension array of java.lang.Integer
* ArrayType<Integer[]> a3 = new ArrayType<Integer[]>(SimpleType.INTEGER, false);
*
* // 4-dimension array of int
* ArrayType<int[][][][]> a4 = new ArrayType<int[][][][]>(3, a2);
*
* // 4-dimension array of java.lang.Integer
* ArrayType<Integer[][][][]> a5 = new ArrayType<Integer[][][][]>(3, a3);
*
* // 1-dimension array of java.lang.String
* ArrayType<String[]> a6 = new ArrayType<String[]>(SimpleType.STRING, false);
*
* // 1-dimension array of long
* ArrayType<long[]> a7 = new ArrayType<long[]>(SimpleType.LONG, true);
*
* // 1-dimension array of java.lang.Integer
* ArrayType<Integer[]> a8 = ArrayType.getArrayType(SimpleType.INTEGER);
*
* // 2-dimension array of java.lang.Integer
* ArrayType<Integer[][]> a9 = ArrayType.getArrayType(a8);
*
* // 2-dimension array of int
* ArrayType<int[][]> a10 = ArrayType.getPrimitiveArrayType(int[][].class);
*
* // 3-dimension array of int
* ArrayType<int[][][]> a11 = ArrayType.getArrayType(a10);
*
* // 1-dimension array of float
* ArrayType<float[]> a12 = ArrayType.getPrimitiveArrayType(float[].class);
*
* // 2-dimension array of float
* ArrayType<float[][]> a13 = ArrayType.getArrayType(a12);
*
* // 1-dimension array of javax.management.ObjectName
* ArrayType<ObjectName[]> a14 = ArrayType.getArrayType(SimpleType.OBJECTNAME);
*
* // 2-dimension array of javax.management.ObjectName
* ArrayType<ObjectName[][]> a15 = ArrayType.getArrayType(a14);
*
* // 3-dimension array of java.lang.String
* ArrayType<String[][][]> a16 = new ArrayType<String[][][]>(3, SimpleType.STRING);
*
* // 1-dimension array of java.lang.String
* ArrayType<String[]> a17 = new ArrayType<String[]>(1, SimpleType.STRING);
*
* // 2-dimension array of java.lang.String
* ArrayType<String[][]> a18 = new ArrayType<String[][]>(1, a17);
*
* // 3-dimension array of java.lang.String
* ArrayType<String[][][]> a19 = new ArrayType<String[][][]>(1, a18);
* }</pre>
*
*
* @since 1.5
*/
/*
Generification note: we could have defined a type parameter that is the
element type, with class ArrayType<E> extends OpenType<E[]>. However,
that doesn't buy us all that much. We can't say
public OpenType<E> getElementOpenType()
because this ArrayType could be a multi-dimensional array.
For example, if we had
ArrayType(2, SimpleType.INTEGER)
then E would have to be Integer[], while getElementOpenType() would
return SimpleType.INTEGER, which is an OpenType<Integer>.
Furthermore, we would like to support int[] (as well as Integer[]) as
an Open Type (RFE 5045358). We would want this to be an OpenType<int[]>
which can't be expressed as <E[]> because E can't be a primitive type
like int.
*/
public class ArrayType<T> extends OpenType<T> {
/* Serial version */
static final long serialVersionUID = 720504429830309770L;
/**
* @serial The dimension of arrays described by this {@link ArrayType}
* instance.
*/
private int dimension;
/**
* @serial The <i>open type</i> of element values contained in the arrays
* described by this {@link ArrayType} instance.
*/
private OpenType<?> elementType;
/**
* @serial This flag indicates whether this {@link ArrayType}
* describes a primitive array.
*
* @since 1.6
*/
private boolean primitiveArray;
private transient Integer myHashCode = null; // As this instance is immutable, these two values
private transient String myToString = null; // need only be calculated once.
// indexes refering to columns in the PRIMITIVE_ARRAY_TYPES table.
private static final int PRIMITIVE_WRAPPER_NAME_INDEX = 0;
private static final int PRIMITIVE_TYPE_NAME_INDEX = 1;
private static final int PRIMITIVE_TYPE_KEY_INDEX = 2;
private static final int PRIMITIVE_OPEN_TYPE_INDEX = 3;
private static final Object[][] PRIMITIVE_ARRAY_TYPES = {
{ Boolean.class.getName(), boolean.class.getName(), "Z", SimpleType.BOOLEAN },
{ Character.class.getName(), char.class.getName(), "C", SimpleType.CHARACTER },
{ Byte.class.getName(), byte.class.getName(), "B", SimpleType.BYTE },
{ Short.class.getName(), short.class.getName(), "S", SimpleType.SHORT },
{ Integer.class.getName(), int.class.getName(), "I", SimpleType.INTEGER },
{ Long.class.getName(), long.class.getName(), "J", SimpleType.LONG },
{ Float.class.getName(), float.class.getName(), "F", SimpleType.FLOAT },
{ Double.class.getName(), double.class.getName(), "D", SimpleType.DOUBLE }
};
static boolean isPrimitiveContentType(final String primitiveKey) {
for (Object[] typeDescr : PRIMITIVE_ARRAY_TYPES) {
if (typeDescr[PRIMITIVE_TYPE_KEY_INDEX].equals(primitiveKey)) {
return true;
}
}
return false;
}
/**
* Return the key used to identify the element type in
* arrays - e.g. "Z" for boolean, "C" for char etc...
* @param elementClassName the wrapper class name of the array
* element ("Boolean", "Character", etc...)
* @return the key corresponding to the given type ("Z", "C", etc...)
* return null if the given elementClassName is not a primitive
* wrapper class name.
**/
static String getPrimitiveTypeKey(String elementClassName) {
for (Object[] typeDescr : PRIMITIVE_ARRAY_TYPES) {
if (elementClassName.equals(typeDescr[PRIMITIVE_WRAPPER_NAME_INDEX]))
return (String)typeDescr[PRIMITIVE_TYPE_KEY_INDEX];
}
return null;
}
/**
* Return the primitive type name corresponding to the given wrapper class.
* e.g. "boolean" for "Boolean", "char" for "Character" etc...
* @param elementClassName the type of the array element ("Boolean",
* "Character", etc...)
* @return the primitive type name corresponding to the given wrapper class
* ("boolean", "char", etc...)
* return null if the given elementClassName is not a primitive
* wrapper type name.
**/
static String getPrimitiveTypeName(String elementClassName) {
for (Object[] typeDescr : PRIMITIVE_ARRAY_TYPES) {
if (elementClassName.equals(typeDescr[PRIMITIVE_WRAPPER_NAME_INDEX]))
return (String)typeDescr[PRIMITIVE_TYPE_NAME_INDEX];
}
return null;
}
/**
* Return the primitive open type corresponding to the given primitive type.
* e.g. SimpleType.BOOLEAN for "boolean", SimpleType.CHARACTER for
* "char", etc...
* @param primitiveTypeName the primitive type of the array element ("boolean",
* "char", etc...)
* @return the OpenType corresponding to the given primitive type name
* (SimpleType.BOOLEAN, SimpleType.CHARACTER, etc...)
* return null if the given elementClassName is not a primitive
* type name.
**/
static SimpleType<?> getPrimitiveOpenType(String primitiveTypeName) {
for (Object[] typeDescr : PRIMITIVE_ARRAY_TYPES) {
if (primitiveTypeName.equals(typeDescr[PRIMITIVE_TYPE_NAME_INDEX]))
return (SimpleType<?>)typeDescr[PRIMITIVE_OPEN_TYPE_INDEX];
}
return null;
}
/* *** Constructor *** */
/**
* Constructs an <tt>ArrayType</tt> instance describing <i>open data</i> values which are
* arrays with dimension <var>dimension</var> of elements whose <i>open type</i> is <var>elementType</var>.
* <p>
* When invoked on an <tt>ArrayType</tt> instance, the {@link OpenType#getClassName() getClassName} method
* returns the class name of the array instances it describes (following the rules defined by the
* {@link Class#getName() getName} method of <code>java.lang.Class</code>), not the class name of the array elements
* (which is returned by a call to <tt>getElementOpenType().getClassName()</tt>).
* <p>
* The internal field corresponding to the type name of this <code>ArrayType</code> instance is also set to
* the class name of the array instances it describes.
* In other words, the methods <code>getClassName</code> and <code>getTypeName</code> return the same string value.
* The internal field corresponding to the description of this <code>ArrayType</code> instance is set to a string value
* which follows the following template:
* <ul>
* <li>if non-primitive array: <tt><i><dimension></i>-dimension array of <i><element_class_name></i></tt></li>
* <li>if primitive array: <tt><i><dimension></i>-dimension array of <i><primitive_type_of_the_element_class_name></i></tt></li>
* </ul>
* <p>
* As an example, the following piece of code:
* <pre>{@code
* ArrayType<String[][][]> t = new ArrayType<String[][][]>(3, SimpleType.STRING);
* System.out.println("array class name = " + t.getClassName());
* System.out.println("element class name = " + t.getElementOpenType().getClassName());
* System.out.println("array type name = " + t.getTypeName());
* System.out.println("array type description = " + t.getDescription());
* }</pre>
* would produce the following output:
* <pre>{@code
* array class name = [[[Ljava.lang.String;
* element class name = java.lang.String
* array type name = [[[Ljava.lang.String;
* array type description = 3-dimension array of java.lang.String
* }</pre>
* And the following piece of code which is equivalent to the one listed
* above would also produce the same output:
* <pre>{@code
* ArrayType<String[]> t1 = new ArrayType<String[]>(1, SimpleType.STRING);
* ArrayType<String[][]> t2 = new ArrayType<String[][]>(1, t1);
* ArrayType<String[][][]> t3 = new ArrayType<String[][][]>(1, t2);
* System.out.println("array class name = " + t3.getClassName());
* System.out.println("element class name = " + t3.getElementOpenType().getClassName());
* System.out.println("array type name = " + t3.getTypeName());
* System.out.println("array type description = " + t3.getDescription());
* }</pre>
*
* @param dimension the dimension of arrays described by this <tt>ArrayType</tt> instance;
* must be greater than or equal to 1.
*
* @param elementType the <i>open type</i> of element values contained
* in the arrays described by this <tt>ArrayType</tt>
* instance; must be an instance of either
* <tt>SimpleType</tt>, <tt>CompositeType</tt>,
* <tt>TabularType</tt> or another <tt>ArrayType</tt>
* with a <tt>SimpleType</tt>, <tt>CompositeType</tt>
* or <tt>TabularType</tt> as its <tt>elementType</tt>.
*
* @throws IllegalArgumentException if {@code dimension} is not a positive
* integer.
* @throws OpenDataException if <var>elementType's className</var> is not
* one of the allowed Java class names for open
* data.
*/
public ArrayType(int dimension,
OpenType<?> elementType) throws OpenDataException {
// Check and construct state defined by parent.
// We can't use the package-private OpenType constructor because
// we don't know if the elementType parameter is sane.
super(buildArrayClassName(dimension, elementType),
buildArrayClassName(dimension, elementType),
buildArrayDescription(dimension, elementType));
// Check and construct state specific to ArrayType
//
if (elementType.isArray()) {
ArrayType<?> at = (ArrayType<?>) elementType;
this.dimension = at.getDimension() + dimension;
this.elementType = at.getElementOpenType();
this.primitiveArray = at.isPrimitiveArray();
} else {
this.dimension = dimension;
this.elementType = elementType;
this.primitiveArray = false;
}
}
/**
* Constructs a unidimensional {@code ArrayType} instance for the
* supplied {@code SimpleType}.
* <p>
* This constructor supports the creation of arrays of primitive
* types when {@code primitiveArray} is {@code true}.
* <p>
* For primitive arrays the {@link #getElementOpenType()} method
* returns the {@link SimpleType} corresponding to the wrapper
* type of the primitive type of the array.
* <p>
* When invoked on an <tt>ArrayType</tt> instance, the {@link OpenType#getClassName() getClassName} method
* returns the class name of the array instances it describes (following the rules defined by the
* {@link Class#getName() getName} method of <code>java.lang.Class</code>), not the class name of the array elements
* (which is returned by a call to <tt>getElementOpenType().getClassName()</tt>).
* <p>
* The internal field corresponding to the type name of this <code>ArrayType</code> instance is also set to
* the class name of the array instances it describes.
* In other words, the methods <code>getClassName</code> and <code>getTypeName</code> return the same string value.
* The internal field corresponding to the description of this <code>ArrayType</code> instance is set to a string value
* which follows the following template:
* <ul>
* <li>if non-primitive array: <tt>1-dimension array of <i><element_class_name></i></tt></li>
* <li>if primitive array: <tt>1-dimension array of <i><primitive_type_of_the_element_class_name></i></tt></li>
* </ul>
* <p>
* As an example, the following piece of code:
* <pre>{@code
* ArrayType<int[]> t = new ArrayType<int[]>(SimpleType.INTEGER, true);
* System.out.println("array class name = " + t.getClassName());
* System.out.println("element class name = " + t.getElementOpenType().getClassName());
* System.out.println("array type name = " + t.getTypeName());
* System.out.println("array type description = " + t.getDescription());
* }</pre>
* would produce the following output:
* <pre>{@code
* array class name = [I
* element class name = java.lang.Integer
* array type name = [I
* array type description = 1-dimension array of int
* }</pre>
*
* @param elementType the {@code SimpleType} of the element values
* contained in the arrays described by this
* {@code ArrayType} instance.
*
* @param primitiveArray {@code true} when this array describes
* primitive arrays.
*
* @throws IllegalArgumentException if {@code dimension} is not a positive
* integer.
* @throws OpenDataException if {@code primitiveArray} is {@code true} and
* {@code elementType} is not a valid {@code SimpleType} for a primitive
* type.
*
* @since 1.6
*/
public ArrayType(SimpleType<?> elementType,
boolean primitiveArray) throws OpenDataException {
// Check and construct state defined by parent.
// We can call the package-private OpenType constructor because the
// set of SimpleTypes is fixed and SimpleType can't be subclassed.
super(buildArrayClassName(1, elementType, primitiveArray),
buildArrayClassName(1, elementType, primitiveArray),
buildArrayDescription(1, elementType, primitiveArray),
true);
// Check and construct state specific to ArrayType
//
this.dimension = 1;
this.elementType = elementType;
this.primitiveArray = primitiveArray;
}
/* Package-private constructor for callers we trust to get it right. */
ArrayType(String className, String typeName, String description,
int dimension, OpenType<?> elementType,
boolean primitiveArray) {
super(className, typeName, description, true);
this.dimension = dimension;
this.elementType = elementType;
this.primitiveArray = primitiveArray;
}
private static String buildArrayClassName(int dimension,
OpenType<?> elementType)
throws OpenDataException {
boolean isPrimitiveArray = false;
if (elementType.isArray()) {
isPrimitiveArray = ((ArrayType<?>) elementType).isPrimitiveArray();
}
return buildArrayClassName(dimension, elementType, isPrimitiveArray);
}
private static String buildArrayClassName(int dimension,
OpenType<?> elementType,
boolean isPrimitiveArray)
throws OpenDataException {
if (dimension < 1) {
throw new IllegalArgumentException(
"Value of argument dimension must be greater than 0");
}
StringBuilder result = new StringBuilder();
String elementClassName = elementType.getClassName();
// Add N (= dimension) additional '[' characters to the existing array
for (int i = 1; i <= dimension; i++) {
result.append('[');
}
if (elementType.isArray()) {
result.append(elementClassName);
} else {
if (isPrimitiveArray) {
final String key = getPrimitiveTypeKey(elementClassName);
// Ideally we should throw an IllegalArgumentException here,
// but for compatibility reasons we throw an OpenDataException.
// (used to be thrown by OpenType() constructor).
//
if (key == null)
throw new OpenDataException("Element type is not primitive: "
+ elementClassName);
result.append(key);
} else {
result.append("L");
result.append(elementClassName);
result.append(';');
}
}
return result.toString();
}
private static String buildArrayDescription(int dimension,
OpenType<?> elementType)
throws OpenDataException {
boolean isPrimitiveArray = false;
if (elementType.isArray()) {
isPrimitiveArray = ((ArrayType<?>) elementType).isPrimitiveArray();
}
return buildArrayDescription(dimension, elementType, isPrimitiveArray);
}
private static String buildArrayDescription(int dimension,
OpenType<?> elementType,
boolean isPrimitiveArray)
throws OpenDataException {
if (elementType.isArray()) {
ArrayType<?> at = (ArrayType<?>) elementType;
dimension += at.getDimension();
elementType = at.getElementOpenType();
isPrimitiveArray = at.isPrimitiveArray();
}
StringBuilder result =
new StringBuilder(dimension + "-dimension array of ");
final String elementClassName = elementType.getClassName();
if (isPrimitiveArray) {
// Convert from wrapper type to primitive type
final String primitiveType =
getPrimitiveTypeName(elementClassName);
// Ideally we should throw an IllegalArgumentException here,
// but for compatibility reasons we throw an OpenDataException.
// (used to be thrown by OpenType() constructor).
//
if (primitiveType == null)
throw new OpenDataException("Element is not a primitive type: "+
elementClassName);
result.append(primitiveType);
} else {
result.append(elementClassName);
}
return result.toString();
}
/* *** ArrayType specific information methods *** */
/**
* Returns the dimension of arrays described by this <tt>ArrayType</tt> instance.
*
* @return the dimension.
*/
public int getDimension() {
return dimension;
}
/**
* Returns the <i>open type</i> of element values contained in the arrays described by this <tt>ArrayType</tt> instance.
*
* @return the element type.
*/
public OpenType<?> getElementOpenType() {
return elementType;
}
/**
* Returns <code>true</code> if the open data values this open
* type describes are primitive arrays, <code>false</code> otherwise.
*
* @return true if this is a primitive array type.
*
* @since 1.6
*/
public boolean isPrimitiveArray() {
return primitiveArray;
}
/**
* Tests whether <var>obj</var> is a value for this <code>ArrayType</code>
* instance.
* <p>
* This method returns <code>true</code> if and only if <var>obj</var>
* is not null, <var>obj</var> is an array and any one of the following
* is <tt>true</tt>:
*
* <ul>
* <li>if this <code>ArrayType</code> instance describes an array of
* <tt>SimpleType</tt> elements or their corresponding primitive types,
* <var>obj</var>'s class name is the same as the className field defined
* for this <code>ArrayType</code> instance (i.e. the class name returned
* by the {@link OpenType#getClassName() getClassName} method, which
* includes the dimension information),<br> </li>
* <li>if this <code>ArrayType</code> instance describes an array of
* classes implementing the {@code TabularData} interface or the
* {@code CompositeData} interface, <var>obj</var> is assignable to
* such a declared array, and each element contained in {<var>obj</var>
* is either null or a valid value for the element's open type specified
* by this <code>ArrayType</code> instance.</li>
* </ul>
*
* @param obj the object to be tested.
*
* @return <code>true</code> if <var>obj</var> is a value for this
* <code>ArrayType</code> instance.
*/
public boolean isValue(Object obj) {
// if obj is null, return false
//
if (obj == null) {
return false;
}
Class<?> objClass = obj.getClass();
String objClassName = objClass.getName();
// if obj is not an array, return false
//
if ( ! objClass.isArray() ) {
return false;
}
// Test if obj's class name is the same as for the array values that this instance describes
// (this is fine if elements are of simple types, which are final classes)
//
if ( this.getClassName().equals(objClassName) ) {
return true;
}
// In case this ArrayType instance describes an array of classes implementing the TabularData or CompositeData interface,
// we first check for the assignability of obj to such an array of TabularData or CompositeData,
// which ensures that:
// . obj is of the the same dimension as this ArrayType instance,
// . it is declared as an array of elements which are either all TabularData or all CompositeData.
//
// If the assignment check is positive,
// then we have to check that each element in obj is of the same TabularType or CompositeType
// as the one described by this ArrayType instance.
//
// [About assignment check, note that the call below returns true: ]
// [Class.forName("[Lpackage.CompositeData;").isAssignableFrom(Class.forName("[Lpackage.CompositeDataImpl;)")); ]
//
if ( (this.elementType.getClassName().equals(TabularData.class.getName())) ||
(this.elementType.getClassName().equals(CompositeData.class.getName())) ) {
boolean isTabular =
(elementType.getClassName().equals(TabularData.class.getName()));
int[] dims = new int[getDimension()];
Class<?> elementClass = isTabular ? TabularData.class : CompositeData.class;
Class<?> targetClass = Array.newInstance(elementClass, dims).getClass();
// assignment check: return false if negative
if ( ! targetClass.isAssignableFrom(objClass) ) {
return false;
}
// check that all elements in obj are valid values for this ArrayType
if ( ! checkElementsType( (Object[]) obj, this.dimension) ) { // we know obj's dimension is this.dimension
return false;
}
return true;
}
// if previous tests did not return, then obj is not a value for this ArrayType instance
return false;
}
/**
* Returns true if and only if all elements contained in the array argument x_dim_Array of dimension dim
* are valid values (ie either null or of the right openType)
* for the element open type specified by this ArrayType instance.
*
* This method's implementation uses recursion to go down the dimensions of the array argument.
*/
private boolean checkElementsType(Object[] x_dim_Array, int dim) {
// if the elements of x_dim_Array are themselves array: go down recursively....
if ( dim > 1 ) {
for (int i=0; i<x_dim_Array.length; i++) {
if ( ! checkElementsType((Object[])x_dim_Array[i], dim-1) ) {
return false;
}
}
return true;
}
// ...else, for a non-empty array, each element must be a valid value: either null or of the right openType
else {
for (int i=0; i<x_dim_Array.length; i++) {
if ( (x_dim_Array[i] != null) && (! this.getElementOpenType().isValue(x_dim_Array[i])) ) {
return false;
}
}
return true;
}
}
@Override
boolean isAssignableFrom(OpenType<?> ot) {
if (!(ot instanceof ArrayType<?>))
return false;
ArrayType<?> at = (ArrayType<?>) ot;
return (at.getDimension() == getDimension() &&
at.isPrimitiveArray() == isPrimitiveArray() &&
at.getElementOpenType().isAssignableFrom(getElementOpenType()));
}
/* *** Methods overriden from class Object *** */
/**
* Compares the specified <code>obj</code> parameter with this
* <code>ArrayType</code> instance for equality.
* <p>
* Two <code>ArrayType</code> instances are equal if and only if they
* describe array instances which have the same dimension, elements'
* open type and primitive array flag.
*
* @param obj the object to be compared for equality with this
* <code>ArrayType</code> instance; if <var>obj</var>
* is <code>null</code> or is not an instance of the
* class <code>ArrayType</code> this method returns
* <code>false</code>.
*
* @return <code>true</code> if the specified object is equal to
* this <code>ArrayType</code> instance.
*/
public boolean equals(Object obj) {
// if obj is null, return false
//
if (obj == null) {
return false;
}
// if obj is not an ArrayType, return false
//
if (!(obj instanceof ArrayType<?>))
return false;
ArrayType<?> other = (ArrayType<?>) obj;
// if other's dimension is different than this instance's, return false
//
if (this.dimension != other.dimension) {
return false;
}
// Test if other's elementType field is the same as for this instance
//
if (!this.elementType.equals(other.elementType)) {
return false;
}
// Test if other's primitiveArray flag is the same as for this instance
//
return this.primitiveArray == other.primitiveArray;
}
/**
* Returns the hash code value for this <code>ArrayType</code> instance.
* <p>
* The hash code of an <code>ArrayType</code> instance is the sum of the
* hash codes of all the elements of information used in <code>equals</code>
* comparisons (i.e. dimension, elements' open type and primitive array flag).
* The hashcode for a primitive value is the hashcode of the corresponding boxed
* object (e.g. the hashcode for <tt>true</tt> is <tt>Boolean.TRUE.hashCode()</tt>).
* This ensures that <code> t1.equals(t2) </code> implies that
* <code> t1.hashCode()==t2.hashCode() </code> for any two
* <code>ArrayType</code> instances <code>t1</code> and <code>t2</code>,
* as required by the general contract of the method
* {@link Object#hashCode() Object.hashCode()}.
* <p>
* As <code>ArrayType</code> instances are immutable, the hash
* code for this instance is calculated once, on the first call
* to <code>hashCode</code>, and then the same value is returned
* for subsequent calls.
*
* @return the hash code value for this <code>ArrayType</code> instance
*/
public int hashCode() {
// Calculate the hash code value if it has not yet been done (ie 1st call to hashCode())
//
if (myHashCode == null) {
int value = 0;
value += dimension;
value += elementType.hashCode();
value += Boolean.valueOf(primitiveArray).hashCode();
myHashCode = Integer.valueOf(value);
}
// return always the same hash code for this instance (immutable)
//
return myHashCode.intValue();
}
/**
* Returns a string representation of this <code>ArrayType</code> instance.
* <p>
* The string representation consists of the name of this class (i.e.
* <code>javax.management.openmbean.ArrayType</code>), the type name,
* the dimension, the elements' open type and the primitive array flag
* defined for this instance.
* <p>
* As <code>ArrayType</code> instances are immutable, the
* string representation for this instance is calculated
* once, on the first call to <code>toString</code>, and
* then the same value is returned for subsequent calls.
*
* @return a string representation of this <code>ArrayType</code> instance
*/
public String toString() {
// Calculate the string representation if it has not yet been done (ie 1st call to toString())
//
if (myToString == null) {
myToString = getClass().getName() +
"(name=" + getTypeName() +
",dimension=" + dimension +
",elementType=" + elementType +
",primitiveArray=" + primitiveArray + ")";
}
// return always the same string representation for this instance (immutable)
//
return myToString;
}
/**
* Create an {@code ArrayType} instance in a type-safe manner.
* <p>
* Multidimensional arrays can be built up by calling this method as many
* times as necessary.
* <p>
* Calling this method twice with the same parameters may return the same
* object or two equal but not identical objects.
* <p>
* As an example, the following piece of code:
* <pre>{@code
* ArrayType<String[]> t1 = ArrayType.getArrayType(SimpleType.STRING);
* ArrayType<String[][]> t2 = ArrayType.getArrayType(t1);
* ArrayType<String[][][]> t3 = ArrayType.getArrayType(t2);
* System.out.println("array class name = " + t3.getClassName());
* System.out.println("element class name = " + t3.getElementOpenType().getClassName());
* System.out.println("array type name = " + t3.getTypeName());
* System.out.println("array type description = " + t3.getDescription());
* }</pre>
* would produce the following output:
* <pre>{@code
* array class name = [[[Ljava.lang.String;
* element class name = java.lang.String
* array type name = [[[Ljava.lang.String;
* array type description = 3-dimension array of java.lang.String
* }</pre>
*
* @param elementType the <i>open type</i> of element values contained
* in the arrays described by this <tt>ArrayType</tt>
* instance; must be an instance of either
* <tt>SimpleType</tt>, <tt>CompositeType</tt>,
* <tt>TabularType</tt> or another <tt>ArrayType</tt>
* with a <tt>SimpleType</tt>, <tt>CompositeType</tt>
* or <tt>TabularType</tt> as its <tt>elementType</tt>.
*
* @throws OpenDataException if <var>elementType's className</var> is not
* one of the allowed Java class names for open
* data.
*
* @since 1.6
*/
public static <E> ArrayType<E[]> getArrayType(OpenType<E> elementType)
throws OpenDataException {
return new ArrayType<E[]>(1, elementType);
}
/**
* Create an {@code ArrayType} instance in a type-safe manner.
* <p>
* Calling this method twice with the same parameters may return the
* same object or two equal but not identical objects.
* <p>
* As an example, the following piece of code:
* <pre>{@code
* ArrayType<int[][][]> t = ArrayType.getPrimitiveArrayType(int[][][].class);
* System.out.println("array class name = " + t.getClassName());
* System.out.println("element class name = " + t.getElementOpenType().getClassName());
* System.out.println("array type name = " + t.getTypeName());
* System.out.println("array type description = " + t.getDescription());
* }</pre>
* would produce the following output:
* <pre>{@code
* array class name = [[[I
* element class name = java.lang.Integer
* array type name = [[[I
* array type description = 3-dimension array of int
* }</pre>
*
* @param arrayClass a primitive array class such as {@code int[].class},
* {@code boolean[][].class}, etc. The {@link
* #getElementOpenType()} method of the returned
* {@code ArrayType} returns the {@link SimpleType}
* corresponding to the wrapper type of the primitive
* type of the array.
*
* @throws IllegalArgumentException if <var>arrayClass</var> is not
* a primitive array.
*
* @since 1.6
*/
@SuppressWarnings("unchecked") // can't get appropriate T for primitive array
public static <T> ArrayType<T> getPrimitiveArrayType(Class<T> arrayClass) {
// Check if the supplied parameter is an array
//
if (!arrayClass.isArray()) {
throw new IllegalArgumentException("arrayClass must be an array");
}
// Calculate array dimension and component type name
//
int n = 1;
Class<?> componentType = arrayClass.getComponentType();
while (componentType.isArray()) {
n++;
componentType = componentType.getComponentType();
}
String componentTypeName = componentType.getName();
// Check if the array's component type is a primitive type
//
if (!componentType.isPrimitive()) {
throw new IllegalArgumentException(
"component type of the array must be a primitive type");
}
// Map component type name to corresponding SimpleType
//
final SimpleType<?> simpleType =
getPrimitiveOpenType(componentTypeName);
// Build primitive array
//
try {
@SuppressWarnings("rawtypes")
ArrayType at = new ArrayType(simpleType, true);
if (n > 1)
at = new ArrayType<T>(n - 1, at);
return at;
} catch (OpenDataException e) {
throw new IllegalArgumentException(e); // should not happen
}
}
/**
* Replace/resolve the object read from the stream before it is returned
* to the caller.
*
* @serialData The new serial form of this class defines a new serializable
* {@code boolean} field {@code primitiveArray}. In order to guarantee the
* interoperability with previous versions of this class the new serial
* form must continue to refer to primitive wrapper types even when the
* {@code ArrayType} instance describes a primitive type array. So when
* {@code primitiveArray} is {@code true} the {@code className},
* {@code typeName} and {@code description} serializable fields
* are converted into primitive types before the deserialized
* {@code ArrayType} instance is return to the caller. The
* {@code elementType} field always returns the {@code SimpleType}
* corresponding to the primitive wrapper type of the array's
* primitive type.
* <p>
* Therefore the following serializable fields are deserialized as follows:
* <ul>
* <li>if {@code primitiveArray} is {@code true} the {@code className}
* field is deserialized by replacing the array's component primitive
* wrapper type by the corresponding array's component primitive type,
* e.g. {@code "[[Ljava.lang.Integer;"} will be deserialized as
* {@code "[[I"}.</li>
* <li>if {@code primitiveArray} is {@code true} the {@code typeName}
* field is deserialized by replacing the array's component primitive
* wrapper type by the corresponding array's component primitive type,
* e.g. {@code "[[Ljava.lang.Integer;"} will be deserialized as
* {@code "[[I"}.</li>
* <li>if {@code primitiveArray} is {@code true} the {@code description}
* field is deserialized by replacing the array's component primitive
* wrapper type by the corresponding array's component primitive type,
* e.g. {@code "2-dimension array of java.lang.Integer"} will be
* deserialized as {@code "2-dimension array of int"}.</li>
* </ul>
*
* @since 1.6
*/
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