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/***************************************************************************
* Copyright (c) 2004, 2005, 2006 Eike Stepper, Germany.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Eike Stepper - initial API and implementation
**************************************************************************/
package org.eclipse.net4j.util;
import org.eclipse.net4j.util.lifecycle.AbstractLifecycle;
import java.io.PrintStream;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.Map;
import java.util.WeakHashMap;
/**
* @author Eike Stepper
*/
public final class ReflectUtil
{
public static final Class<Object> ROOT_CLASS = Object.class;
public static final Class[] NO_PARAMETERS = null;
public static final Object[] NO_ARGUMENTS = null;
private static final String NL = System.getProperty("line.separator"); //$NON-NLS-1$
private static final Method HASH_CODE_METHOD = lookupHashCodeMethod();
private static final Map<Object, Long> ids = new WeakHashMap();
public static boolean DUMP_STATICS = false;
private static long lastID;
private ReflectUtil()
{
}
public static Integer getHashCode(Object object)
{
try
{
return (Integer)HASH_CODE_METHOD.invoke(object, NO_ARGUMENTS);
}
catch (Exception ex)
{
IOUtil.print(ex);
}
return 0;
}
public static Long getID(Object object)
{
Long id = ids.get(object);
if (id == null)
{
id = ++lastID;
ids.put(object, id);
}
return id;
}
public static String getPackageName(Class<? extends Object> c)
{
if (c == null)
{
return null;
}
return getPackageName(c.getName());
}
public static String getPackageName(String className)
{
if (className == null)
{
return null;
}
int lastDot = className.lastIndexOf('.');
if (lastDot != -1)
{
className = className.substring(0, lastDot);
}
return className;
}
public static String getSimpleName(Class<? extends Object> c)
{
if (c == null)
{
return null;
}
return getSimpleClassName(c.getName());
}
public static String getSimpleClassName(String name)
{
if (name == null)
{
return null;
}
int lastDot = name.lastIndexOf('.');
if (lastDot != -1)
{
name = name.substring(lastDot + 1);
}
return name.replace('$', '.');
}
public static String getSimpleClassName(Object object)
{
if (object == null)
{
return null;
}
return getSimpleName(object.getClass());
}
public static String getLabel(Object object)
{
if (object == null)
{
return null;
}
return getSimpleClassName(object) + "@" + getID(object); //$NON-NLS-1$
}
public static void dump(Object object)
{
dump(object, ""); //$NON-NLS-1$
}
public static void dump(Object object, String prefix)
{
dump(object, prefix, IOUtil.OUT());
}
public static void dump(Object object, String prefix, PrintStream out)
{
out.print(toString(object, prefix));
}
public static String toString(Object object)
{
return toString(object, ""); //$NON-NLS-1$
}
public static String toString(Object object, String prefix)
{
StringBuilder builder = new StringBuilder();
builder.append(prefix);
builder.append(getLabel(object));
builder.append(NL);
toString(object.getClass(), object, prefix, builder);
return builder.toString();
}
private static void toString(Class<? extends Object> segment, Object object, String prefix,
StringBuilder builder)
{
if (segment == ROOT_CLASS || segment == AbstractLifecycle.class)
{
return;
}
// Recurse
toString(segment.getSuperclass(), object, prefix, builder);
String segmentPrefix = segment == object.getClass() ? "" : getSimpleName(segment) + "."; //$NON-NLS-1$ //$NON-NLS-2$
Field[] fields = segment.getDeclaredFields();
for (Field field : fields)
{
if (field.isSynthetic())
{
continue;
}
if ((field.getModifiers() & Modifier.STATIC) != 0 && !DUMP_STATICS)
{
continue;
}
builder.append(prefix);
builder.append(segmentPrefix);
builder.append(field.getName());
builder.append(" = "); //$NON-NLS-1$
builder.append(getValue(object, field));
builder.append(NL);
}
}
public static Object getValue(Object object, Field field)
{
try
{
return field.get(object);
}
catch (IllegalAccessException ex)
{
field.setAccessible(true);
try
{
return field.get(object);
}
catch (IllegalAccessException ex1)
{
throw new RuntimeException(ex1);
}
}
}
private static Method lookupHashCodeMethod()
{
Method method;
try
{
method = ROOT_CLASS.getMethod("hashCode", NO_PARAMETERS); //$NON-NLS-1$
}
catch (Exception ex)
{
// This can really not happen
throw new AssertionError();
}
if (!method.isAccessible())
{
method.setAccessible(true);
}
return method;
}
}
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