- /*
- * @(#)OpenMBeanConstructorInfoSupport.java 3.22 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.Arrays;
-
-
- // jmx import
- //
- import javax.management.MBeanConstructorInfo;
- import javax.management.MBeanParameterInfo;
-
-
- /**
- * Describes a constructor of an Open MBean.
- *
- * @version 3.22 03/12/19
- * @author Sun Microsystems, Inc.
- *
- * @since 1.5
- * @since.unbundled JMX 1.1
- */
- public class OpenMBeanConstructorInfoSupport
- extends MBeanConstructorInfo
- implements OpenMBeanConstructorInfo, Serializable {
-
- /* Serial version */
- static final long serialVersionUID = -4400441579007477003L;
-
-
- 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 <tt>OpenMBeanConstructorInfoSupport</tt> instance, which describes the constructor
- * of a class of open MBeans with the specified <var>name</var>, <var>description</var> and <var>signature</var>.
- * <p>
- * The <var>signature</var> array parameter is internally copied, so that subsequent changes
- * to the array referenced by <var>signature</var> have no effect on this instance.
- *
- * @param name cannot be a null or empty string.
- *
- * @param description cannot be a null or empty string.
- *
- * @param signature can be null or empty if there are no parameters to describe.
- *
- * @throws IllegalArgumentException if <var>name</var> or <var>description</var> are null or empty string.
- *
- * @throws ArrayStoreException If <var>signature</var> is not an array of instances of a subclass of <tt>MBeanParameterInfo</tt>.
- */
- public OpenMBeanConstructorInfoSupport(String name,
- String description,
- OpenMBeanParameterInfo[] signature) {
-
- super(name,
- description,
- ( signature == null ? null : arrayCopyCast(signature) )); // may throw an ArrayStoreException
-
- // 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 ( (description == null) || (description.trim().equals("")) ) {
- throw new IllegalArgumentException("Argument description cannot be null or empty.");
- }
-
- }
-
- private static MBeanParameterInfo[] arrayCopyCast(OpenMBeanParameterInfo[] src) throws ArrayStoreException {
-
- MBeanParameterInfo[] dst = new MBeanParameterInfo[src.length];
- System.arraycopy(src, 0, dst, 0, src.length); // may throw an ArrayStoreException
- return dst;
- }
-
-
- /* *** Commodity methods from java.lang.Object *** */
-
-
- /**
- * Compares the specified <var>obj</var> parameter with this <code>OpenMBeanConstructorInfoSupport</code> instance for equality.
- * <p>
- * Returns <tt>true</tt> if and only if all of the following statements are true:
- * <ul>
- * <li><var>obj</var> is non null,</li>
- * <li><var>obj</var> also implements the <code>OpenMBeanConstructorInfo</code> interface,</li>
- * <li>their names are equal</li>
- * <li>their signatures are equal.</li>
- * </ul>
- * This ensures that this <tt>equals</tt> method works properly for <var>obj</var> parameters which are
- * different implementations of the <code>OpenMBeanConstructorInfo</code> interface.
- * <br>
- * @param obj the object to be compared for equality with this <code>OpenMBeanConstructorInfoSupport</code> instance;
- *
- * @return <code>true</code> if the specified object is equal to this <code>OpenMBeanConstructorInfoSupport</code> instance.
- */
- public boolean equals(Object obj) {
-
- // if obj is null, return false
- //
- if (obj == null) {
- return false;
- }
-
- // if obj is not a OpenMBeanConstructorInfo, return false
- //
- OpenMBeanConstructorInfo other;
- try {
- other = (OpenMBeanConstructorInfo) obj;
- } catch (ClassCastException e) {
- return false;
- }
-
- // Now, really test for equality between this OpenMBeanConstructorInfo implementation and the other:
- //
-
- // their Name should be equal
- if ( ! this.getName().equals(other.getName()) ) {
- return false;
- }
-
- // their Signatures should be equal
- if ( ! Arrays.equals(this.getSignature(), other.getSignature()) ) {
- return false;
- }
-
- // All tests for equality were successfull
- //
- return true;
- }
-
- /**
- * Returns the hash code value for this <code>OpenMBeanConstructorInfoSupport</code> instance.
- * <p>
- * The hash code of an <code>OpenMBeanConstructorInfoSupport</code> instance is the sum of the hash codes
- * of all elements of information used in <code>equals</code> comparisons
- * (ie: its name and signature, where the signature hashCode is calculated by a call to
- * <tt>java.util.Arrays.asList(this.getSignature).hashCode()</tt>).
- * <p>
- * This ensures that <code> t1.equals(t2) </code> implies that <code> t1.hashCode()==t2.hashCode() </code>
- * for any two <code>OpenMBeanConstructorInfoSupport</code> instances <code>t1</code> and <code>t2</code>,
- * as required by the general contract of the method
- * {@link Object#hashCode() Object.hashCode()}.
- * <p>
- * However, note that another instance of a class implementing the <code>OpenMBeanConstructorInfo</code> interface
- * may be equal to this <code>OpenMBeanConstructorInfoSupport</code> instance as defined by {@link #equals(java.lang.Object)},
- * but may have a different hash code if it is calculated differently.
- * <p>
- * As <code>OpenMBeanConstructorInfoSupport</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>OpenMBeanConstructorInfoSupport</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 += this.getName().hashCode();
- value += Arrays.asList(this.getSignature()).hashCode();
- myHashCode = new Integer(value);
- }
-
- // return always the same hash code for this instance (immutable)
- //
- return myHashCode.intValue();
- }
-
- /**
- * Returns a string representation of this <code>OpenMBeanConstructorInfoSupport</code> instance.
- * <p>
- * The string representation consists of the name of this class (ie <code>javax.management.openmbean.OpenMBeanConstructorInfoSupport</code>),
- * and of the name and signature of the described constructor.
- * <p>
- * As <code>OpenMBeanConstructorInfoSupport</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>OpenMBeanConstructorInfoSupport</code> instance
- */
- public String toString() {
-
- // Calculate the hash code value if it has not yet been done (ie 1st call to toString())
- //
- if (myToString == null) {
- myToString = new StringBuffer()
- .append(this.getClass().getName())
- .append("(name=")
- .append(this.getName())
- .append(",signature=")
- .append(Arrays.asList(this.getSignature()).toString())
- .append(")")
- .toString();
- }
-
- // return always the same string representation for this instance (immutable)
- //
- return myToString;
- }
-
- }