/*
* @(#)OpenMBeanAttributeInfoSupport.java 3.28 03/12/19
*
* Copyright 2004 Sun Microsystems, Inc. All rights reserved.
* SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*/
package javax.management.openmbean;
// java import
//
import java.io.Serializable;
import java.util.Set;
import java.util.HashSet;
import java.util.Collections;
import java.lang.Comparable; // to be substituted for jdk1.1.x
// jmx import
//
import javax.management.MBeanAttributeInfo;
/**
* Describes an attribute of an open MBean.
*
* @version 3.28 03/12/19
* @author Sun Microsystems, Inc.
*
* @since 1.5
* @since.unbundled JMX 1.1
*/
public class OpenMBeanAttributeInfoSupport
extends MBeanAttributeInfo
implements OpenMBeanAttributeInfo, Serializable {
/* Serial version */
static final long serialVersionUID = -4867215622149721849L;
/**
* @serial The open mbean attribute's open type
*/
private OpenType openType;
/**
* @serial The open mbean attribute's default value
*/
private Object defaultValue = null;
/**
* @serial The open mbean attribute's legal values. This {@link Set} is unmodifiable
*/
private Set legalValues = null; // to be constructed unmodifiable
/**
* @serial The open mbean attribute's min value
*/
private Comparable minValue = null;
/**
* @serial The open mbean attribute's max value
*/
private Comparable maxValue = null;
private transient Integer myHashCode = null; // As this instance is immutable, these two values
private transient String myToString = null; // need only be calculated once.
/**
* Constructs an OpenMBeanAttributeInfoSupport instance, which describes the attribute of an open MBean
* with the specified name, openType and description,
* and the specified read/write access properties.
*
* @param name cannot be a null or empty string.
*
* @param description cannot be a null or empty string.
*
* @param openType cannot be null.
*
* @param isReadable true if the attribute has a getter exposed for management.
*
* @param isWritable true if the attribute has a setter exposed for management.
*
* @param isIs true if the attribute's getter is of the form isXXX.
*
* @throws IllegalArgumentException if name or description are null or empty string,
* or openType is null.
*/
public OpenMBeanAttributeInfoSupport(String name,
String description,
OpenType openType,
boolean isReadable,
boolean isWritable,
boolean isIs) {
// Construct parent's state
//
super(name, ( (openType==null) ? null : openType.getClassName() ), description, isReadable, isWritable, isIs);
// check parameters that should not be null or empty (unfortunately it is not done in superclass :-( ! )
//
if ( (name == null) || (name.trim().equals("")) ) {
throw new IllegalArgumentException("Argument name cannot be null or empty.");
}
if (openType == null) {
throw new IllegalArgumentException("Argument openType cannot be null.");
}
if ( (description == null) || (description.trim().equals("")) ) {
throw new IllegalArgumentException("Argument description cannot be null or empty.");
}
// Initialize this instance's specific state
//
this.openType = openType;
}
/**
* Constructs an OpenMBeanAttributeInfoSupport instance, which describes the attribute of an open MBean
* with the specified name, openType, description and defaultValue,
* and the specified read/write access properties.
*
* @param name cannot be a null or empty string.
*
* @param description cannot be a null or empty string.
*
* @param openType cannot be null.
*
* @param isReadable true if the attribute has a getter exposed for management.
*
* @param isWritable true if the attribute has a setter exposed for management.
*
* @param isIs true if the attribute's getter is of the form isXXX.
*
* @param defaultValue must be a valid value for the openType specified for this attribute;
* default value not supported for ArrayType and TabularType;
* can be null, in which case it means that no default value is set.
*
* @throws IllegalArgumentException if name or description are null or empty string,
* or openType is null.
*
* @throws OpenDataException if defaultValue is not a valid value for the specified openType,
* or defaultValue is non null and
* openType is an ArrayType or a TabularType.
*/
public OpenMBeanAttributeInfoSupport(String name,
String description,
OpenType openType,
boolean isReadable,
boolean isWritable,
boolean isIs,
Object defaultValue) throws OpenDataException {
// First check and construct the part regarding name, openType and description
//
this(name, description, openType, isReadable, isWritable, isIs);
// Check and initialize defaultValue
//
if (defaultValue != null) {
// Default value not supported for ArrayType and TabularType
if ( (openType.isArray()) || (openType instanceof TabularType) ) {
throw new OpenDataException("Default value not supported for ArrayType and TabularType.");
}
// Check defaultValue's class
if ( ! openType.isValue(defaultValue) ) {
throw new OpenDataException("Argument defaultValue's class [\""+ defaultValue.getClass().getName() +
"\"] does not match the one defined in openType[\""+ openType.getClassName() +"\"].");
}
// Then initializes defaultValue:
// no need to clone it: apart from arrays and TabularData, basic data types are immutable
this.defaultValue = defaultValue;
}
}
/**
* Constructs an OpenMBeanAttributeInfoSupport instance, which describes the attribute of an open MBean
* with the specified name, openType, description,
* defaultValue and legalValues,
* and the specified read/write access properties.
*
* The contents of legalValues are internally dumped into an unmodifiable Set,
* so subsequent modifications of the array referenced by legalValues have no impact on
* this OpenMBeanAttributeInfoSupport instance.
*
* @param name cannot be a null or empty string.
*
* @param description cannot be a null or empty string.
*
* @param openType cannot be null.
*
* @param isReadable true if the attribute has a getter exposed for management.
*
* @param isWritable true if the attribute has a setter exposed for management.
*
* @param isIs true if the attribute's getter is of the form isXXX.
*
* @param defaultValue must be a valid value for the openType specified for this attribute;
* default value not supported for ArrayType and TabularType;
* can be null, in which case it means that no default value is set.
*
* @param legalValues each contained value must be valid for the openType specified for this attribute;
* legal values not supported for ArrayType and TabularType;
* can be null or empty.
*
* @throws IllegalArgumentException if name or description are null or empty string,
* or openType is null.
*
* @throws OpenDataException if defaultValue is not a valid value for the specified openType,
* or one value in legalValues is not valid for the specified openType,
* or defaultValue is non null and
* openType is an ArrayType or a TabularType,
* or legalValues is non null and non empty and
* openType is an ArrayType or a TabularType,
* or legalValues is non null and non empty and
* defaultValue is not contained in legalValues.
*/
public OpenMBeanAttributeInfoSupport(String name,
String description,
OpenType openType,
boolean isReadable,
boolean isWritable,
boolean isIs,
Object defaultValue,
Object[] legalValues) throws OpenDataException {
// First check and construct the part regarding name, openType, description and defaultValue
//
this(name, description, openType, isReadable, isWritable, isIs, defaultValue);
// Check and initialize legalValues
//
if ( (legalValues != null) && (legalValues.length > 0) ){
// legalValues not supported for TabularType and arrays
if ( (openType instanceof TabularType) || (openType.isArray()) ) {
throw new OpenDataException("Legal values not supported for TabularType and arrays");
}
// Check legalValues are valid with openType
for (int i = 0; i < legalValues.length; i++ ) {
if ( ! openType.isValue(legalValues[i]) ) {
throw new OpenDataException("Element legalValues["+ i +"]="+ legalValues[i] +
" is not a valid value for the specified openType ["+ openType.toString() +"].");
}
}
// dump the legalValues array content into a Set: ensures uniqueness of elements
// (and we could not keep the array reference as array content could be modified by the caller)
Set tmpSet = new HashSet(legalValues.length+1, 1);
for (int i = 0; i < legalValues.length; i++ ) {
tmpSet.add(legalValues[i]);
}
// initializes legalValues as an unmodifiable Set
this.legalValues = Collections.unmodifiableSet(tmpSet);
}
// Check that defaultValue is a legal value
//
if ( (this.hasDefaultValue()) && (this.hasLegalValues()) ) {
if ( ! this.legalValues.contains(defaultValue) ) {
throw new OpenDataException("defaultValue is not contained in legalValues");
}
}
}
/**
* Constructs an OpenMBeanAttributeInfoSupport instance, which describes the attribute
* used in one or more operations or constructors of a class of open MBeans,
* with the specified name, openType, description,
* defaultValue, minValue and maxValue.
*
* It is possible to specify minimal and maximal values only for an open type
* whose values are Comparable.
*
* @param name cannot be a null or empty string.
*
* @param description cannot be a null or empty string.
*
* @param openType cannot be null.
*
* @param isReadable true if the attribute has a getter exposed for management.
*
* @param isWritable true if the attribute has a setter exposed for management.
*
* @param isIs true if the attribute's getter is of the form isXXX.
*
* @param defaultValue must be a valid value for the openType specified for this attribute;
* default value not supported for ArrayType and TabularType;
* can be null, in which case it means that no default value is set.
*
* @param minValue must be valid for the openType specified for this attribute;
* can be null, in which case it means that no minimal value is set.
*
* @param maxValue must be valid for the openType specified for this attribute;
* can be null, in which case it means that no maximal value is set.
*
* @throws IllegalArgumentException if name or description are null or empty string,
* or openType is null.
*
* @throws OpenDataException if defaultValue, minValue or maxValue
* is not a valid value for the specified openType,
* or defaultValue is non null and
* openType is an ArrayType or a TabularType,
* or both minValue and maxValue are non-null and
* minValue.compareTo(maxValue) > 0 is true,
* or both defaultValue and minValue are non-null and
* minValue.compareTo(defaultValue) > 0 is true,
* or both defaultValue and maxValue are non-null and
* defaultValue.compareTo(maxValue) > 0 is true.
*/
public OpenMBeanAttributeInfoSupport(String name,
String description,
OpenType openType,
boolean isReadable,
boolean isWritable,
boolean isIs,
Object defaultValue,
Comparable minValue,
Comparable maxValue) throws OpenDataException {
// First check and construct the part regarding name, openType, description and defaultValue
//
this(name, description, openType, isReadable, isWritable, isIs, defaultValue);
// Check and initialize minValue
//(note: no need to worry about Composite, Tabular and arrays as they are not Comparable)
//
if (minValue != null) {
if ( ! openType.isValue(minValue) ) {
throw new OpenDataException("Argument minValue's class [\""+ minValue.getClass().getName() +
"\"] does not match openType's definition [\""+ openType.getClassName() +"\"].");
}
// then initializes minValue
this.minValue = minValue;
}
// Check and initialize maxValue
//(note: no need to worry about Composite, Tabular and arrays as they are not Comparable)
//
if (maxValue != null) {
if ( ! openType.isValue(maxValue) ) {
throw new OpenDataException("Argument maxValue's class [\""+ maxValue.getClass().getName() +
"\"] does not match openType's definition [\""+ openType.getClassName() +"\"].");
}
// then initializes maxValue
this.maxValue = maxValue;
}
// Check that, if both specified, minValue <= maxValue
//
if (hasMinValue() && hasMaxValue()) {
if (minValue.compareTo(maxValue) > 0) {
throw new OpenDataException("minValue cannot be greater than maxValue.");
}
}
// Check that minValue <= defaultValue <= maxValue
//
if ( (this.hasDefaultValue()) && (this.hasMinValue()) ) {
if (minValue.compareTo((Comparable)defaultValue) > 0) {
throw new OpenDataException("minValue cannot be greater than defaultValue.");
}
}
if ( (this.hasDefaultValue()) && (this.hasMaxValue()) ) {
if (((Comparable)defaultValue).compareTo(maxValue) > 0) {
throw new OpenDataException("defaultValue cannot be greater than maxValue.");
}
}
}
/**
* Returns the open type for the values of the attribute described by this OpenMBeanAttributeInfoSupport instance.
*/
public OpenType getOpenType() {
return openType;
}
/**
* Returns the default value for the attribute described by this OpenMBeanAttributeInfoSupport instance,
* if specified, or null otherwise.
*/
public Object getDefaultValue() {
// Special case for ArrayType and TabularType
// [JF] TODO: clone it so that it cannot be altered,
// [JF] TODO: if we decide to support defaultValue as an array itself.
// [JF] As of today (oct 2000) it is not supported so defaultValue is null for arrays. Nothing to do.
return defaultValue;
}
/**
* Returns an unmodifiable Set of legal values for the attribute described by this OpenMBeanAttributeInfoSupport instance,
* if specified, or null otherwise.
*/
public Set getLegalValues() {
// Special case for ArrayType and TabularType
// [JF] TODO: clone values so that they cannot be altered,
// [JF] TODO: if we decide to support LegalValues as an array itself.
// [JF] As of today (oct 2000) it is not supported so legalValues is null for arrays. Nothing to do.
// Returns our legalValues Set (set was constructed unmodifiable)
return (legalValues);
}
/**
* Returns the minimal value for the attribute described by this OpenMBeanAttributeInfoSupport instance,
* if specified, or null otherwise.
*/
public Comparable getMinValue() {
// Note: only comparable values have a minValue, so that's not the case of arrays and tabulars (always null).
return minValue;
}
/**
* Returns the maximal value for the attribute described by this OpenMBeanAttributeInfoSupport instance,
* if specified, or null otherwise.
*/
public Comparable getMaxValue() {
// Note: only comparable values have a maxValue, so that's not the case of arrays and tabulars (always null).
return maxValue;
}
/**
* Returns true if this OpenMBeanAttributeInfoSupport instance specifies a non-null default value
* for the described attribute, false otherwise.
*/
public boolean hasDefaultValue() {
return (defaultValue != null);
}
/**
* Returns true if this OpenMBeanAttributeInfoSupport instance specifies a non-null set of legal values
* for the described attribute, false otherwise.
*/
public boolean hasLegalValues() {
return (legalValues != null);
}
/**
* Returns true if this OpenMBeanAttributeInfoSupport instance specifies a non-null minimal value
* for the described attribute, false otherwise.
*/
public boolean hasMinValue() {
return (minValue != null);
}
/**
* Returns true if this OpenMBeanAttributeInfoSupport instance specifies a non-null maximal value
* for the described attribute, false otherwise.
*/
public boolean hasMaxValue() {
return (maxValue != null);
}
/**
* Tests whether obj is a valid value for the attribute
* described by this OpenMBeanAttributeInfoSupport
* instance.
*
* @param obj the object to be tested.
*
* @return true if obj is a valid value for for the parameter described by
* this OpenMBeanAttributeInfoSupport instance, false otherwise.
*/
public boolean isValue(Object obj) {
boolean result;
if ( hasDefaultValue() && obj == null ) {
result = true;
}
else if ( ! openType.isValue(obj) ) {
result = false;
}
else if ( hasLegalValues() && ! legalValues.contains(obj) ) {
result = false;
}
else if ( hasMinValue() && (minValue.compareTo(obj)>0) ) {
result = false;
}
else if ( hasMaxValue() && (maxValue.compareTo(obj)<0) ) {
result = false;
}
else {
result = true;
}
return result;
}
/* *** Commodity methods from java.lang.Object *** */
/**
* Compares the specified obj parameter with this OpenMBeanAttributeInfoSupport instance for equality.
*
* Returns true if and only if all of the following statements are true:
*
* - obj is non null,
* - obj also implements the
OpenMBeanAttributeInfo interface,
* - their names are equal
* - their open types are equal
* - their access properties (isReadable, isWritable and isIs) are equal
* - their default, min, max and legal values are equal.
*
* This ensures that this equals method works properly for obj parameters which are
* different implementations of the OpenMBeanAttributeInfo interface.
*
* @param obj the object to be compared for equality with this OpenMBeanAttributeInfoSupport instance;
*
* @return true if the specified object is equal to this OpenMBeanAttributeInfoSupport instance.
*/
public boolean equals(Object obj) {
// if obj is null, return false
//
if (obj == null) {
return false;
}
// if obj is not a OpenMBeanAttributeInfo, return false
//
OpenMBeanAttributeInfo other;
try {
other = (OpenMBeanAttributeInfo) obj;
} catch (ClassCastException e) {
return false;
}
// Now, really test for equality between this OpenMBeanAttributeInfo implementation and the other:
//
// their Name should be equal
if ( ! this.getName().equals(other.getName()) ) {
return false;
}
// their OpenType should be equal
if ( ! this.getOpenType().equals(other.getOpenType()) ) {
return false;
}
// their access properties (isReadable, isWritable and isIs) are equal
if ( (this.isReadable() != other.isReadable()) ||
(this.isWritable() != other.isWritable()) ||
(this.isIs() != other.isIs()) ) {
return false;
}
// their DefaultValue should be equal
if (this.hasDefaultValue()) {
if ( ! this.defaultValue.equals(other.getDefaultValue()) ) {
return false;
}
} else {
if (other.hasDefaultValue()) {
return false;
}
}
// their MinValue should be equal
if (this.hasMinValue()) {
if ( ! this.minValue.equals(other.getMinValue()) ) {
return false;
}
} else {
if (other.hasMinValue()) {
return false;
}
}
// their MaxValue should be equal
if (this.hasMaxValue()) {
if ( ! this.maxValue.equals(other.getMaxValue()) ) {
return false;
}
} else {
if (other.hasMaxValue()) {
return false;
}
}
// their LegalValues should be equal
if (this.hasLegalValues()) {
if ( ! this.legalValues.equals(other.getLegalValues()) ) {
return false;
}
} else {
if (other.hasLegalValues()) {
return false;
}
}
// All tests for equality were successfull
//
return true;
}
/**
* Returns the hash code value for this OpenMBeanAttributeInfoSupport instance.
*
* The hash code of an OpenMBeanAttributeInfoSupport instance is the sum of the hash codes
* of all elements of information used in equals comparisons
* (ie: its name, its open type, and its default, min, max and legal values).
*
* This ensures that t1.equals(t2) implies that t1.hashCode()==t2.hashCode()
* for any two OpenMBeanAttributeInfoSupport instances t1 and t2,
* as required by the general contract of the method
* {@link Object#hashCode() Object.hashCode()}.
*
* However, note that another instance of a class implementing the OpenMBeanAttributeInfo interface
* may be equal to this OpenMBeanAttributeInfoSupport instance as defined by {@link #equals(java.lang.Object)},
* but may have a different hash code if it is calculated differently.
*
* As OpenMBeanAttributeInfoSupport instances are immutable, the hash code for this instance is calculated once,
* on the first call to hashCode, and then the same value is returned for subsequent calls.
*
* @return the hash code value for this OpenMBeanAttributeInfoSupport 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 += this.getName().hashCode();
value += this.openType.hashCode();
if (this.hasDefaultValue()) {
value += this.defaultValue.hashCode();
}
if (this.hasMinValue()) {
value += this.minValue.hashCode();
}
if (this.hasMaxValue()) {
value += this.maxValue.hashCode();
}
if (this.hasLegalValues()) {
value += this.legalValues.hashCode();
}
myHashCode = new Integer(value);
}
// return always the same hash code for this instance (immutable)
//
return myHashCode.intValue();
}
/**
* Returns a string representation of this OpenMBeanAttributeInfoSupport instance.
*
* The string representation consists of the name of this class (ie javax.management.openmbean.OpenMBeanAttributeInfoSupport),
* the string representation of the name and open type of the described parameter,
* and the string representation of its default, min, max and legal values.
*
* As OpenMBeanAttributeInfoSupport instances are immutable, the string representation for this instance is calculated once,
* on the first call to toString, and then the same value is returned for subsequent calls.
*
* @return a string representation of this OpenMBeanAttributeInfoSupport instance
*/
public String toString() {
// Calculate the hash code value if it has not yet been done (ie 1st call to hashCode())
//
if (myToString == null) {
myToString = new StringBuffer()
.append(this.getClass().getName())
.append("(name=")
.append(this.getName())
.append(",openType=")
.append(this.openType.toString())
.append(",default=")
.append(String.valueOf(this.defaultValue))
.append(",min=")
.append(String.valueOf(this.minValue))
.append(",max=")
.append(String.valueOf(this.maxValue))
.append(",legals=")
.append(String.valueOf(this.legalValues))
.append(")")
.toString();
}
// return always the same string representation for this instance (immutable)
//
return myToString;
}
}