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/*
* Copyright (c) 2000, 2022, Oracle and/or its affiliates.
*
* Licensed under the Universal Permissive License v 1.0 as shown at
* https://oss.oracle.com/licenses/upl.
*/
package com.tangosol.util.extractor;
import com.tangosol.io.ExternalizableLite;
import com.tangosol.io.pof.PofReader;
import com.tangosol.io.pof.PofWriter;
import com.tangosol.io.pof.PortableObject;
import com.tangosol.util.ClassHelper;
import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.lang.reflect.Method;
import jakarta.json.bind.annotation.JsonbProperty;
/**
* Reflection-based ValueUpdater implementation.
*
* @author gg 2005.10.27
*
* @see CompositeUpdater
*/
public class ReflectionUpdater
extends AbstractUpdater
implements ExternalizableLite, PortableObject
{
// ----- constructors ---------------------------------------------------
/**
* Default constructor (necessary for the ExternalizableLite interface).
*/
public ReflectionUpdater()
{
}
/**
* Construct a ReflectionUpdater for a given method name.
* This implementation assumes that the corresponding classes will have
* one and only one method with a specified name and this method will have
* exactly one parameter.
*
* @param sMethod the name of the method to invoke via reflection
*/
public ReflectionUpdater(String sMethod)
{
azzert(sMethod != null);
m_sMethod = sMethod;
}
// ----- ValueUpdater interface -----------------------------------------
/**
* {@inheritDoc}
*/
public void update(Object oTarget, Object oValue)
{
if (oTarget == null)
{
throw new IllegalArgumentException(
"Target object is missing for the Updater: " + this);
}
Class clzTarget = oTarget.getClass();
String sMethod = getMethodName();
try
{
Method method = m_methodPrev;
if (method == null || method.getDeclaringClass() != clzTarget)
{
Class[] aclzParam = new Class[1];
if (oValue != null)
{
aclzParam[0] = oValue.getClass();
}
if (!ClassHelper.isReflectionAllowed(oTarget))
{
throw new IllegalArgumentException("The type, " + clzTarget.getName() +
", is disallowed as a reflection target by the current " +
"reflection filter configuration");
}
m_methodPrev = method =
ClassHelper.findMethod(clzTarget, sMethod, aclzParam, false);
}
method.invoke(oTarget, oValue);
}
catch (NullPointerException e)
{
throw new RuntimeException("Missing or inaccessible method: " +
clzTarget.getName() + '#' + sMethod);
}
catch (Exception e)
{
throw ensureRuntimeException(e,
clzTarget.getName() + '#' + sMethod + '(' + oTarget +')');
}
}
// ----- accessors and helpers ------------------------------------------
/**
* Determine the name of the method that this extractor is configured to
* invoke.
*
* @return the name of the method to invoke using reflection
*/
public String getMethodName()
{
return m_sMethod;
}
// ----- Object methods -------------------------------------------------
/**
* Compare the ReflectionUpdater with another object to determine
* equality.
*
* @return true iff this ReflectionUpdater and the passed object are
* equivalent ReflectionUpdaters
*/
public boolean equals(Object o)
{
if (o instanceof ReflectionUpdater)
{
ReflectionUpdater that = (ReflectionUpdater) o;
return this.m_sMethod.equals(that.m_sMethod);
}
return false;
}
/**
* Determine a hash value for the ReflectionUpdater object according to
* the general {@link Object#hashCode()} contract.
*
* @return an integer hash value for this ReflectionUpdater object
*/
public int hashCode()
{
return m_sMethod.hashCode();
}
/**
* Provide a human-readable description of this ValueUpdater object.
*
* @return a human-readable description of this ValueUpdater object
*/
public String toString()
{
return '&' + m_sMethod;
}
// ----- ExternalizableLite interface -----------------------------------
/**
* {@inheritDoc}
*/
public void readExternal(DataInput in)
throws IOException
{
m_sMethod = in.readUTF();
}
/**
* {@inheritDoc}
*/
public void writeExternal(DataOutput out)
throws IOException
{
out.writeUTF(m_sMethod);
}
// ----- PortableObject interface ---------------------------------------
/**
* {@inheritDoc}
*/
public void readExternal(PofReader in)
throws IOException
{
m_sMethod = in.readString(0);
}
/**
* {@inheritDoc}
*/
public void writeExternal(PofWriter out)
throws IOException
{
out.writeString(0, m_sMethod);
}
// ----- data members ---------------------------------------------------
/**
* The name of the method to invoke.
*/
@JsonbProperty("method")
protected String m_sMethod;
/**
* A cached reflection method (to avoid repeated look-ups).
*/
@JsonbProperty("methodPrev")
private transient Method m_methodPrev;
}