Mega Code Archive
Field modifiers
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/*
* Copyright (c) 1995 - 2008 Sun Microsystems, Inc. All rights reserved.
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*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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*/
import static java.lang.System.out;
import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
enum Spy {
BLACK, WHITE
}
public class FieldModifierSpy {
volatile int share;
int instance;
class Inner {
}
public static void main(String... args) {
try {
Class<?> c = Class.forName(args[0]);
int searchMods = 0x0;
for (int i = 1; i < args.length; i++) {
searchMods |= modifierFromString(args[i]);
}
Field[] flds = c.getDeclaredFields();
out.format("Fields in Class '%s' containing modifiers: %s%n", c
.getName(), Modifier.toString(searchMods));
boolean found = false;
for (Field f : flds) {
int foundMods = f.getModifiers();
// Require all of the requested modifiers to be present
if ((foundMods & searchMods) == searchMods) {
out.format("%-8s [ synthetic=%-5b enum_constant=%-5b ]%n", f
.getName(), f.isSynthetic(), f.isEnumConstant());
found = true;
}
}
if (!found) {
out.format("No matching fields%n");
}
// production code should handle this exception more gracefully
} catch (ClassNotFoundException x) {
x.printStackTrace();
}
}
private static int modifierFromString(String s) {
int m = 0x0;
if ("public".equals(s))
m |= Modifier.PUBLIC;
else if ("protected".equals(s))
m |= Modifier.PROTECTED;
else if ("private".equals(s))
m |= Modifier.PRIVATE;
else if ("static".equals(s))
m |= Modifier.STATIC;
else if ("final".equals(s))
m |= Modifier.FINAL;
else if ("transient".equals(s))
m |= Modifier.TRANSIENT;
else if ("volatile".equals(s))
m |= Modifier.VOLATILE;
return m;
}
}
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