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/*******************************************************************************
* Copyright (c) 1997, 2010 by ProSyst Software GmbH
* http://www.prosyst.com
* 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:
* ProSyst Software GmbH - initial API and implementation
*******************************************************************************/
package org.eclipse.equinox.internal.ds;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.Dictionary;
import java.util.Enumeration;
import org.apache.felix.scr.Component;
import org.eclipse.equinox.internal.util.pool.ObjectCreator;
import org.eclipse.equinox.internal.util.pool.ObjectPool;
/**
* Holds useful methods used by SCR.
*
* @author Valentin Valchev
* @author Stoyan Boshev
* @author Pavlin Dobrev
*/
public final class SCRUtil implements ObjectCreator {
private static ObjectPool objectArrayPool;
static {
SCRUtil u = new SCRUtil();
// FIXME: use some kind of logging for the object pool to determine
// the optimal solution!
objectArrayPool = new ObjectPool(u, 10, 2);
}
private SCRUtil() {
//
}
public static Object[] getObjectArray() {
return (Object[]) objectArrayPool.getObject();
}
public static void release(Object[] objectArray) {
for (int j = 0; j < objectArray.length; j++) {
objectArray[j] = null;
}
objectArrayPool.releaseObject(objectArray);
}
public Object getInstance() throws Exception {
return new Object[1];
}
public static void copyTo(Dictionary dst, Dictionary src) {
if (src == null || dst == null) {
return;
}
Object key;
for (Enumeration e = src.keys(); e.hasMoreElements();) {
key = e.nextElement();
dst.put(key, src.get(key));
}
}
/**
* Checks whether the method can be accessed according to the DS v1.1 specification rules (112.8.4 Locating Component Methods)
* @param implClass the component implementation class
* @param currentClass the class where the method is located. This class is in the component implementation class hierarchy
* @param methodToCheck the method to be checked
* @param isComponent11 specifies whether the component is according to schema 1.1 or higher. Its value is true in case the component version is v1.1 or higher
* @return true, if the method can be executed
*/
public static boolean checkMethodAccess(Class implClass, Class currentClass, Method methodToCheck, boolean isComponent11) {
int modifiers = methodToCheck.getModifiers();
boolean result = true;
if (isComponent11) {
if (currentClass == implClass) {
//the method is located in the component impl class
//allow all types of modifiers
} else {
//the method is located in a super class of the component impl class
if (Modifier.isPrivate(modifiers)) {
// private method - no access
result = false;
} else if (!Modifier.isPublic(modifiers) && !Modifier.isProtected(modifiers)) {
// not protected neither public neither private - this is private package case
if (currentClass.getPackage() != implClass.getPackage()) {
//do not accept the method if its class package differs the package of the component impl class
result = false;
}
}
}
} else {
result = Modifier.isPublic(modifiers) || Modifier.isProtected(modifiers);
}
return result;
}
private static Method setAccessibleMethod = null;
private static Object[] args = null;
private static boolean failed = false;
/**
* This method is added only for JVM compatibility. Actually setAccessible()
* is available since jdk1.2. The older java runtimes don't have this
* method.
*
* However, you can call this method. It is guaranteed that it will do the
* right job.
*
* @param method
* the method to set accessible.
*/
public static final void setAccessible(Method method) {
try {
if (setAccessibleMethod == null && !failed) {
setAccessibleMethod = Class.forName("java.lang.reflect.AccessibleObject").getMethod("setAccessible", new Class[] {boolean.class}); //$NON-NLS-1$ //$NON-NLS-2$
args = new Object[] {Boolean.TRUE};
}
if (setAccessibleMethod != null)
setAccessibleMethod.invoke(method, args);
} catch (Exception e) {
failed = true;
}
}
/**
* Gets the string representation of an <code>Object</code>. This method is
* helpful if the passed parameter is a type of array. If the objects is not
* recognized as array, the method will simply return the toString() value
*
* @param value
* an object which should be represented as string
* @return the string representation of the
*/
public static String getStringRepresentation(Object value) {
if (value == null)
return "null"; //$NON-NLS-1$
//this would speedup many cases
if (value instanceof String)
return (String) value;
StringBuffer res = new StringBuffer(200);
if (value instanceof String[]) {
res.append("String["); //$NON-NLS-1$
String[] arr = (String[]) value;
for (int i = 0; i < arr.length; i++) {
res.append(arr[i]);
if (i != arr.length - 1) {
res.append(","); //$NON-NLS-1$
}
}
res.append("]"); //$NON-NLS-1$
} else if (value instanceof int[]) {
res.append("int["); //$NON-NLS-1$
int[] arr = (int[]) value;
for (int i = 0; i < arr.length; i++) {
res.append(arr[i] + ""); //$NON-NLS-1$
if (i != arr.length - 1) {
res.append(","); //$NON-NLS-1$
}
}
res.append("]"); //$NON-NLS-1$
} else if (value instanceof long[]) {
res.append("long["); //$NON-NLS-1$
long[] arr = (long[]) value;
for (int i = 0; i < arr.length; i++) {
res.append(arr[i] + ""); //$NON-NLS-1$
if (i != arr.length - 1) {
res.append(","); //$NON-NLS-1$
}
}
res.append("]"); //$NON-NLS-1$
} else if (value instanceof char[]) {
res.append("char["); //$NON-NLS-1$
char[] arr = (char[]) value;
for (int i = 0; i < arr.length; i++) {
res.append(arr[i] + ""); //$NON-NLS-1$
if (i != arr.length - 1) {
res.append(","); //$NON-NLS-1$
}
}
res.append("]"); //$NON-NLS-1$
} else if (value instanceof boolean[]) {
res.append("boolean["); //$NON-NLS-1$
boolean[] arr = (boolean[]) value;
for (int i = 0; i < arr.length; i++) {
res.append(arr[i] + ""); //$NON-NLS-1$
if (i != arr.length - 1) {
res.append(","); //$NON-NLS-1$
}
}
res.append("]"); //$NON-NLS-1$
} else if (value instanceof double[]) {
res.append("double["); //$NON-NLS-1$
double[] arr = (double[]) value;
for (int i = 0; i < arr.length; i++) {
res.append(arr[i] + ""); //$NON-NLS-1$
if (i != arr.length - 1) {
res.append(","); //$NON-NLS-1$
}
}
res.append("]"); //$NON-NLS-1$
} else if (value instanceof float[]) {
res.append("float["); //$NON-NLS-1$
float[] arr = (float[]) value;
for (int i = 0; i < arr.length; i++) {
res.append(arr[i] + ""); //$NON-NLS-1$
if (i != arr.length - 1) {
res.append(","); //$NON-NLS-1$
}
}
res.append("]"); //$NON-NLS-1$
} else if (value instanceof Object[]) {
res.append("Object["); //$NON-NLS-1$
Object[] arr = (Object[]) value;
for (int i = 0; i < arr.length; i++) {
res.append(getStringRepresentation(arr[i]));
if (i != arr.length - 1) {
res.append(","); //$NON-NLS-1$
}
}
res.append("]"); //$NON-NLS-1$
} else {
return value.toString();
}
return res.toString();
}
/**
* Gets the string presentation of a state defined by the interface org.apache.felix.scr.Component
* @param state the specified state
* @return the string representation of the specified state
*/
public static String getStateStringRepresentation(int state) {
String result = "Unknown"; //$NON-NLS-1$
switch (state) {
case Component.STATE_ACTIVATING :
result = "Activating"; //$NON-NLS-1$
break;
case Component.STATE_ACTIVE :
result = "Active"; //$NON-NLS-1$
break;
case Component.STATE_DEACTIVATING :
result = "Deactivating"; //$NON-NLS-1$
break;
case Component.STATE_DISABLED :
result = "Disabled"; //$NON-NLS-1$
break;
case Component.STATE_DISPOSED :
result = "Disposed"; //$NON-NLS-1$
break;
case Component.STATE_DISPOSING :
result = "Disposing"; //$NON-NLS-1$
break;
case Component.STATE_ENABLING :
result = "Enabling"; //$NON-NLS-1$
break;
case Component.STATE_FACTORY :
result = "Factory"; //$NON-NLS-1$
break;
case Component.STATE_REGISTERED :
result = "Registered"; //$NON-NLS-1$
break;
case Component.STATE_UNSATISFIED :
result = "Unsatisfied"; //$NON-NLS-1$
break;
}
return result;
}
}
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