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/*
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 *
 * Copyright (c) 2009-2010,2012 Oracle and/or its affiliates. All rights reserved.
 *
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 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
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/*
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 * and open the template in the editor.
 */
package org.glassfish.flashlight.impl.provider;

import com.sun.enterprise.util.LocalStringManagerImpl;

import java.lang.reflect.Method;

import org.glassfish.flashlight.FlashlightUtils;
import org.glassfish.flashlight.provider.FlashlightProbe;

/**
 *
 * @author bnevins
 */
class DTraceMethodFinder {

    public final static LocalStringManagerImpl localStrings =
            new LocalStringManagerImpl(DTraceMethodFinder.class);

    DTraceMethodFinder(FlashlightProbe p, Object t) {
        probe = p;
        targetObject = t;
        targetClass = targetObject.getClass();
        probeParamTypes = probe.getParamTypes();

        if (probeParamTypes == null)
            probeParamTypes = new Class[0];

        numProbeParams = probeParamTypes.length;
    }

    Method matchMethod() {
        String metname = probe.getProviderJavaMethodName();

        // bnevins - the contract is that you do not call me with a hidden probe
        // If you do anyway -- I'll throw an unchecked exception as punishment.
        if (probe.isHidden())
            throw new RuntimeException(localStrings.getLocalString("dtrace_cantfind",
                    "The probe is  hidden.  DTrace will ignore it.", metname));

        for (Method m : targetClass.getMethods()) {
            if (!m.getName().equals(metname))
                continue;

            // we have a name match!!
            Class[] paramTypes = m.getParameterTypes(); // guaranteed non null

            if (paramTypes.length != numProbeParams)
                continue; // overloaded method

            if (!compareParams(probeParamTypes, paramTypes))
                continue; // overloaded method

            // we have a match!!!
            return m;
        }
        String errStr = localStrings.getLocalString("dtrace_cantfind",
                "Can not match the Probe method ({0}) with any method in the DTrace object.", metname);
        throw new RuntimeException(errStr);
    }

    private boolean compareParams(Class[] probep, Class[] dtracep) {
        // the lengths are guaranteed to be the same!
        for (int i = 0; i < probep.length; i++) {
            Class probeClass = probep[i];
            Class dtraceClass = dtracep[i];

            if (probeClass.equals(dtraceClass))
                continue;
            // something that can be coverted to String...
            else if (dtraceClass.equals(String.class) && !FlashlightUtils.isIntegral(probeClass))
                continue;
            // check for something like Short.class versus short.class
            // JDK will handle the boxing/unboxing
            else if (FlashlightUtils.compareIntegral(dtraceClass, probeClass))
                continue;
            else
                return false;
        }

        return true;
    }
    private final FlashlightProbe probe;
    private final Object targetObject;
    private final Class targetClass;
    private final int numProbeParams;
    private Method method;
    private Class[] probeParamTypes;
}