/*
 * Copyright (c) 1999, 2006, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
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 */

package javax.management;


/**
 * Describes an argument of an operation exposed by an MBean.
 * Instances of this class are immutable.  Subclasses may be mutable
 * but this is not recommended.
 *
 * @since 1.5
 */
public class MBeanParameterInfo extends MBeanFeatureInfo implements Cloneable {

    /* Serial version */
    static final long serialVersionUID = 7432616882776782338L;

    /* All zero-length arrays are interchangeable. */
    static final MBeanParameterInfo[] NO_PARAMS = new MBeanParameterInfo[0];

    /**
     * @serial The type or class name of the data.
     */
    private final String type;


    /**
     * Constructs an <CODE>MBeanParameterInfo</CODE> object.
     *
     * @param name The name of the data
     * @param type The type or class name of the data
     * @param description A human readable description of the data. Optional.
     */
    public MBeanParameterInfo(String name,
                              String type,
                              String description) {
        this(name, type, description, (Descriptor) null);
    }

    /**
     * Constructs an <CODE>MBeanParameterInfo</CODE> object.
     *
     * @param name The name of the data
     * @param type The type or class name of the data
     * @param description A human readable description of the data. Optional.
     * @param descriptor The descriptor for the operation.  This may be null
     * which is equivalent to an empty descriptor.
     *
     * @since 1.6
     */
    public MBeanParameterInfo(String name,
                              String type,
                              String description,
                              Descriptor descriptor) {
        super(name, description, descriptor);

        this.type = type;
    }


    /**
     * <p>Returns a shallow clone of this instance.
     * The clone is obtained by simply calling <tt>super.clone()</tt>,
     * thus calling the default native shallow cloning mechanism
     * implemented by <tt>Object.clone()</tt>.
     * No deeper cloning of any internal field is made.</p>
     *
     * <p>Since this class is immutable, cloning is chiefly of
     * interest to subclasses.</p>
     */
     public Object clone () {
         try {
             return super.clone() ;
         } catch (CloneNotSupportedException e) {
             // should not happen as this class is cloneable
             return null;
         }
     }

    /**
     * Returns the type or class name of the data.
     *
     * @return the type string.
     */
    public String getType() {
        return type;
    }

    public String toString() {
        return
            getClass().getName() + "[" +
            "description=" + getDescription() + ", " +
            "name=" + getName() + ", " +
            "type=" + getType() + ", " +
            "descriptor=" + getDescriptor() +
            "]";
    }

    /**
     * Compare this MBeanParameterInfo to another.
     *
     * @param o the object to compare to.
     *
     * @return true if and only if <code>o</code> is an MBeanParameterInfo such
     * that its {@link #getName()}, {@link #getType()},
     * {@link #getDescriptor()}, and {@link
     * #getDescription()} values are equal (not necessarily identical)
     * to those of this MBeanParameterInfo.
     */
    public boolean equals(Object o) {
        if (o == this)
            return true;
        if (!(o instanceof MBeanParameterInfo))
            return false;
        MBeanParameterInfo p = (MBeanParameterInfo) o;
        return (p.getName().equals(getName()) &&
                p.getType().equals(getType()) &&
                p.getDescription().equals(getDescription()) &&
                p.getDescriptor().equals(getDescriptor()));
    }

    public int hashCode() {
        return getName().hashCode() ^ getType().hashCode();
    }
}