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package com.sun.faces.application.resource;
import static java.util.logging.Level.SEVERE;
import java.io.IOException;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.logging.Logger;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
import javax.faces.context.ExternalContext;
import javax.faces.context.FacesContext;
import com.sun.faces.util.FacesLogger;
class ZipDirectoryEntryScanner {
private static final Logger LOGGER = FacesLogger.RESOURCE.getLogger();
private static final String PREFIX = "META-INF/resources";
private static final int PREFIX_LENGTH = PREFIX.length();
Map<String, Boolean> resourceLibraries;
ZipDirectoryEntryScanner() {
ExternalContext extContext = FacesContext.getCurrentInstance().getExternalContext();
Set<String> webInfLibJars = extContext.getResourcePaths("/WEB-INF/lib");
resourceLibraries = new ConcurrentHashMap<>();
ZipEntry ze = null;
String entryName = null;
if (webInfLibJars != null) {
for (String cur : webInfLibJars) {
try (ZipInputStream zis = new ZipInputStream(extContext.getResourceAsStream(cur))) {
while (null != (ze = zis.getNextEntry())) {
entryName = ze.getName();
if (entryName.startsWith(PREFIX) && PREFIX_LENGTH < entryName.length()) {
entryName = entryName.substring(PREFIX_LENGTH + 1);
if (!entryName.endsWith("/")) {
// Assume this code is only reached if the zip entry
// is NOT a 'directory' entry.
int i = entryName.lastIndexOf("/");
if (-1 != i) {
entryName = entryName.substring(0, i);
if (!resourceLibraries.containsKey(entryName)) {
resourceLibraries.put(entryName, Boolean.TRUE);
}
}
}
}
}
} catch (IOException ioe) {
if (LOGGER.isLoggable(SEVERE)) {
LOGGER.log(SEVERE, "Unable to inspect resource library " + cur, ioe);
}
}
}
}
// remove the optional local prefix entries
Iterator<String> iter = resourceLibraries.keySet().iterator();
String cur;
while (iter.hasNext()) {
cur = iter.next();
if (cur.contains("/")) {
iter.remove();
}
}
}
boolean libraryExists(String libraryName, String localePrefix) {
String key = localePrefix != null? localePrefix + "/" + libraryName : libraryName;
return resourceLibraries.containsKey(key);
}
}