Example usage for java.net JarURLConnection getUseCaches

Introduction

In this page you can find the example usage for java.net JarURLConnection getUseCaches.

Prototype

public boolean getUseCaches() 

Source Link

Document

Returns the value of this URLConnection 's useCaches field.

Usage

From source file:org.springframework.core.io.support.PathMatchingResourcePatternResolver.java

/**
 * Find all resources in jar files that match the given location pattern
 * via the Ant-style PathMatcher./*from   ww w .  j av a  2 s .com*/
 * @param rootDirResource the root directory as Resource
 * @param rootDirURL the pre-resolved root directory URL
 * @param subPattern the sub pattern to match (below the root directory)
 * @return a mutable Set of matching Resource instances
 * @throws IOException in case of I/O errors
 * @since 4.3
 * @see java.net.JarURLConnection
 * @see org.springframework.util.PathMatcher
 */
protected Set<Resource> doFindPathMatchingJarResources(Resource rootDirResource, URL rootDirURL,
        String subPattern) throws IOException {

    URLConnection con = rootDirURL.openConnection();
    JarFile jarFile;
    String jarFileUrl;
    String rootEntryPath;
    boolean closeJarFile;

    if (con instanceof JarURLConnection) {
        // Should usually be the case for traditional JAR files.
        JarURLConnection jarCon = (JarURLConnection) con;
        ResourceUtils.useCachesIfNecessary(jarCon);
        jarFile = jarCon.getJarFile();
        jarFileUrl = jarCon.getJarFileURL().toExternalForm();
        JarEntry jarEntry = jarCon.getJarEntry();
        rootEntryPath = (jarEntry != null ? jarEntry.getName() : "");
        closeJarFile = !jarCon.getUseCaches();
    } else {
        // No JarURLConnection -> need to resort to URL file parsing.
        // We'll assume URLs of the format "jar:path!/entry", with the protocol
        // being arbitrary as long as following the entry format.
        // We'll also handle paths with and without leading "file:" prefix.
        String urlFile = rootDirURL.getFile();
        try {
            int separatorIndex = urlFile.indexOf(ResourceUtils.WAR_URL_SEPARATOR);
            if (separatorIndex == -1) {
                separatorIndex = urlFile.indexOf(ResourceUtils.JAR_URL_SEPARATOR);
            }
            if (separatorIndex != -1) {
                jarFileUrl = urlFile.substring(0, separatorIndex);
                rootEntryPath = urlFile.substring(separatorIndex + 2); // both separators are 2 chars
                jarFile = getJarFile(jarFileUrl);
            } else {
                jarFile = new JarFile(urlFile);
                jarFileUrl = urlFile;
                rootEntryPath = "";
            }
            closeJarFile = true;
        } catch (ZipException ex) {
            if (logger.isDebugEnabled()) {
                logger.debug("Skipping invalid jar classpath entry [" + urlFile + "]");
            }
            return Collections.emptySet();
        }
    }

    try {
        if (logger.isDebugEnabled()) {
            logger.debug("Looking for matching resources in jar file [" + jarFileUrl + "]");
        }
        if (!"".equals(rootEntryPath) && !rootEntryPath.endsWith("/")) {
            // Root entry path must end with slash to allow for proper matching.
            // The Sun JRE does not return a slash here, but BEA JRockit does.
            rootEntryPath = rootEntryPath + "/";
        }
        Set<Resource> result = new LinkedHashSet<>(8);
        for (Enumeration<JarEntry> entries = jarFile.entries(); entries.hasMoreElements();) {
            JarEntry entry = entries.nextElement();
            String entryPath = entry.getName();
            if (entryPath.startsWith(rootEntryPath)) {
                String relativePath = entryPath.substring(rootEntryPath.length());
                if (getPathMatcher().match(subPattern, relativePath)) {
                    result.add(rootDirResource.createRelative(relativePath));
                }
            }
        }
        return result;
    } finally {
        if (closeJarFile) {
            jarFile.close();
        }
    }
}

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