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package org.graalvm.visualvm.lib.profiler.heapwalk.details.jdk;

import java.lang.reflect.Modifier;
import org.graalvm.visualvm.lib.jfluid.heap.Heap;
import org.graalvm.visualvm.lib.jfluid.heap.Instance;
import org.graalvm.visualvm.lib.jfluid.heap.JavaClass;
import org.graalvm.visualvm.lib.profiler.heapwalk.details.spi.DetailsProvider;
import org.graalvm.visualvm.lib.profiler.heapwalk.details.spi.DetailsUtils;
import org.graalvm.visualvm.lib.profiler.heapwalk.model.BrowserUtils;
import org.openide.util.lookup.ServiceProvider;

/**
 *
 * @author Jiri Sedlacek
 */
@ServiceProvider(service=DetailsProvider.class)
public class ReflectionDetailsProvider extends DetailsProvider.Basic {
    
    private static final String CLASS_MASK = "java.lang.Class";                     // NOI18N
    private static final String CONSTRUCTOR_MASK = "java.lang.reflect.Constructor"; // NOI18N
    private static final String METHOD_MASK = "java.lang.reflect.Method";           // NOI18N
    private static final String FIELD_MASK = "java.lang.reflect.Field";             // NOI18N
    private static final String PARAMETER_MASK = "java.lang.reflect.Parameter";     // NOI18N
    
    public ReflectionDetailsProvider() {
        super(CLASS_MASK,CONSTRUCTOR_MASK, METHOD_MASK, FIELD_MASK, PARAMETER_MASK);
    }
    
    public String getDetailsString(String className, Instance instance, Heap heap) {
        if (CLASS_MASK.equals(className)) {                                     // Class
            String name = DetailsUtils.getInstanceFieldString(instance, "name", heap); // NOI18N
            if (name == null && CLASS_MASK.equals(instance.getJavaClass().getName())) {
                JavaClass jclass = heap.getJavaClassByID(instance.getInstanceId());
                if (jclass != null) name = BrowserUtils.getSimpleType(jclass.getName());
//                if (jclass != null) name = jclass.getName();
            }
            return name;
        } else if (CONSTRUCTOR_MASK.equals(className)) {                        // Constructor
            Object value = instance.getValueOfField("clazz");                   // NOI18N
            if (value instanceof Instance) return getDetailsString("java.lang.Class", (Instance)value, heap); // NOI18N
        } else if (METHOD_MASK.equals(className)) {                             // Method
            return DetailsUtils.getInstanceFieldString(instance, "name", heap); // NOI18N
        } else if (FIELD_MASK.equals(className)) {                              // Field
            int mod = DetailsUtils.getIntFieldValue(instance, "modifiers", 0);
            String type = DetailsUtils.getInstanceFieldString(instance, "type", heap); // NOI18N
            String name = DetailsUtils.getInstanceFieldString(instance, "name", heap); // NOI18N
            String clazz = DetailsUtils.getInstanceFieldString(instance, "clazz", heap); // NOI18N

            return (((mod == 0) ? "" : (Modifier.toString(mod) + " "))
                + type + " " + clazz + "." + name);
        } else if (PARAMETER_MASK.equals(className)) {                          // Parameter
            return DetailsUtils.getInstanceFieldString(instance, "name", heap); // NOI18N
        }
        return null;
    }
    
}
