package net.sf.snmpadaptor4j.core.accessor;

 import javax.management.Attribute;

 import javax.management.MBeanServer;

 import javax.management.ObjectName;

 import net.sf.snmpadaptor4j.api.AttributeAccessor;

 import net.sf.snmpadaptor4j.core.mapping.MBeanAttributeMapping;

 import net.sf.snmpadaptor4j.object.SnmpDataType;

 import net.sf.snmpadaptor4j.object.SnmpOid;

 /**

  * Object representing an accessor to an attribute of MBean.

  * @author <a href="http://fr.linkedin.com/in/jpminetti/">Jean-Philippe MINETTI</a>

  */

 public final class MBeanAttributeAccessor

                 implements AttributeAccessor {

         /**

          * JMX agent where the MBean was registered.

          */

         private final MBeanServer server;

         /**

          * MBean name.

          */

         private final ObjectName mBeanName;

         /**

          * Mapping for access to a MBean attribute.

          */

         private final MBeanAttributeMapping mapping;

         /**

          * Constructor.

          * @param server JMX agent where the MBean was registered.

          * @param mBeanName MBean name.

          * @param mapping Mapping for access to a MBean attribute.

          */

         public MBeanAttributeAccessor (final MBeanServer server, final ObjectName mBeanName, final MBeanAttributeMapping mapping) {

                 super();

                 this.server = server;

                 this.mBeanName = mBeanName;

                 this.mapping = mapping;

         }

         /**

          * Returns the MBean name.

          * @return MBean name.

          */

         public ObjectName getMBeanName () {

                 return this.mBeanName;

         }

         /*

          * {@inheritDoc}

          * @see net.sf.snmpadaptor4j.api.AttributeAccessor#getOid()

          */

         public SnmpOid getOid () {

                 return this.mapping.getOid();

         }

         /*

          * {@inheritDoc}

          * @see net.sf.snmpadaptor4j.api.AttributeAccessor#getSnmpDataType()

          */

         public SnmpDataType getSnmpDataType () {

                 return this.mapping.getSnmpDataType();

         }

         /*

          * {@inheritDoc}

          * @see net.sf.snmpadaptor4j.api.AttributeAccessor#getJmxDataType()

          */

         public Class<?> getJmxDataType () {

                 return this.mapping.getJmxDataType();

         }

         /*

          * {@inheritDoc}

          * @see net.sf.snmpadaptor4j.api.AttributeAccessor#getValue()

          */

         public Object getValue () throws Exception {

                 return this.server.getAttribute(this.mBeanName, this.mapping.getAttributeName());

         }

         /*

          * {@inheritDoc}

          * @see net.sf.snmpadaptor4j.api.AttributeAccessor#setValue(java.lang.Object)

          */

         public void setValue (final Object value) throws Exception {

                 this.server.setAttribute(this.mBeanName, new Attribute(this.mapping.getAttributeName(), value));

         }

         /*

          * {@inheritDoc}

          * @see net.sf.snmpadaptor4j.api.AttributeAccessor#isReadable()

          */

         public boolean isReadable () {

                 return this.mapping.isReadable();

         }

         /*

          * {@inheritDoc}

          * @see net.sf.snmpadaptor4j.api.AttributeAccessor#isWritable()

          */

         public boolean isWritable () {

                 return this.mapping.isWritable();

         }

         /*

          * {@inheritDoc}

          * @see java.lang.Object#toString()

          */

         @Override

         public String toString () {

                 Object value;

                 try {

                         value = getValue();

                 }

                 catch (final Throwable e) {

                         value = "ERROR: " + (e.getMessage() != null ? e.getMessage() : e.getClass().getName());

                 }

                 return this.mapping.getOid() + ": (" + this.mapping.getSnmpDataType() + ") " + value;

         }

 }