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/*
*******************************************************************************
* Copyright (C) 2004-2009, International Business Machines Corporation and *
* others. All Rights Reserved. *
*******************************************************************************
*
* Created on Feb 4, 2004
*
*/
package com.ibm.icu.impl;
import java.io.InputStream;
import java.net.URL;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.MissingResourceException;
/**
* Provides access to ICU data files as InputStreams. Implements security checking.
*/
public final class ICUData {
/*
* Return a URL to the ICU resource names resourceName. The
* resource name should either be an absolute path, or a path relative to
* com.ibm.icu.impl (e.g., most likely it is 'data/foo'). If required
* is true, throw an MissingResourceException instead of returning a null result.
*/
public static boolean exists(final String resourceName) {
URL i = null;
if (System.getSecurityManager() != null) {
i = AccessController.doPrivileged(new PrivilegedAction<URL>() {
public URL run() {
return ICUData.class.getResource(resourceName);
}
});
} else {
i = ICUData.class.getResource(resourceName);
}
return i != null;
}
private static InputStream getStream(final Class<?> root, final String resourceName, boolean required) {
InputStream i = null;
if (System.getSecurityManager() != null) {
i = AccessController.doPrivileged(new PrivilegedAction<InputStream>() {
public InputStream run() {
return root.getResourceAsStream(resourceName);
}
});
} else {
i = root.getResourceAsStream(resourceName);
}
if (i == null && required) {
throw new MissingResourceException("could not locate data " +resourceName, root.getPackage().getName(), resourceName);
}
return i;
}
private static InputStream getStream(final ClassLoader loader, final String resourceName, boolean required) {
InputStream i = null;
if (System.getSecurityManager() != null) {
i = AccessController.doPrivileged(new PrivilegedAction<InputStream>() {
public InputStream run() {
return loader.getResourceAsStream(resourceName);
}
});
} else {
i = loader.getResourceAsStream(resourceName);
}
if (i == null && required) {
throw new MissingResourceException("could not locate data", loader.toString(), resourceName);
}
return i;
}
public static InputStream getStream(ClassLoader loader, String resourceName){
return getStream(loader,resourceName, false);
}
public static InputStream getRequiredStream(ClassLoader loader, String resourceName){
return getStream(loader, resourceName, true);
}
/*
* Convenience override that calls getStream(ICUData.class, resourceName, false);
*/
public static InputStream getStream(String resourceName) {
return getStream(ICUData.class, resourceName, false);
}
/*
* Convenience method that calls getStream(ICUData.class, resourceName, true).
*/
public static InputStream getRequiredStream(String resourceName) {
return getStream(ICUData.class, resourceName, true);
}
/*
* Convenience override that calls getStream(root, resourceName, false);
*/
public static InputStream getStream(Class<?> root, String resourceName) {
return getStream(root, resourceName, false);
}
/*
* Convenience method that calls getStream(root, resourceName, true).
*/
public static InputStream getRequiredStream(Class<?> root, String resourceName) {
return getStream(root, resourceName, true);
}
}
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