Examples of org.apache.catalina.WebResourceRoot

org.apache.catalina.WebResourceRoot
Represents the complete set of resources for a web application. The resources for a web application comprise of multiple ResourceSets and when looking for a Resource, the ResourceSets are processed in the following order:
1. Pre - Resources defined by the <PreResource> element in the web application's context.xml. Resources will be searched in the order they were specified.
2. Main - The main resources for the web application - i.e. the WAR or the directory containing the expanded WAR
3. JARs - Resource JARs as defined by the Servlet specification. JARs will be searched in the order they were added to the ResourceRoot.
4. Post - Resources defined by the <PostResource> element in the web application's context.xml. Resources will be searched in the order they were specified.
The following conventions should be noted:
- Write operations (including delete) will only be applied to the main ResourceSet. The write operation will fail if the presence of a Resource in one of the other ResourceSets effectively makes the operation on the main ResourceSet a NO-OP.
- A file in a ResourceSet will hide a directory of the same name (and all the contents of that directory) in a ResourceSet that is later in the search order.
- Only the main ResourceSet may define a META-INF/context.xml since that file defines the Pre- and Post-Resources.
- As per the Servlet specification, any META-INF or WEB-INF directories in a resource JAR will be ignored.
- Pre- and Post-Resources may define WEB-INF/lib and WEB-INF/classes in order to make additional libraries and/or classes available to the web application.
This mechanism replaces and extends the following features that were present in earlier versions:
- Aliases - Replaced by Post-Resources with the addition of support for single files as well as directories and JARs.
- VirtualWebappLoader - Replaced by Pre- and Post-Resources mapped to WEB-INF/lib and WEB-INF/classes
- VirtualDirContext - Replaced by Pre- and Post-Resources
- External repositories - Replaced by Pre- and Post-Resources mapped to WEB-INF/lib and WEB-INF/classes
- Resource JARs - Same feature but implemented using the same mechanism as all the other additional resources.

                if (realm != parentRealm) {
                    storeElement(aWriter, indent, realm);
                }
            }
            // Store nested resources
            WebResourceRoot resources = context.getResources();
            storeElement(aWriter, indent, resources);


            // Store nested <InstanceListener> elements
            String iListeners[] = context.findInstanceListeners();
            getStoreAppender().printTagArray(aWriter, "InstanceListener",

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    @Override
    public final WebResource getResource(String path) {
        checkPath(path);
        String webAppMount = getWebAppMount();
        WebResourceRoot root = getRoot();


        /*
         * Implementation notes
         *
         * The path parameter passed into this method always starts with '/'.

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    @Override
    public void setResources(WebResourceRoot resources) {


        Lock writeLock = resourcesLock.writeLock();
        writeLock.lock();
        WebResourceRoot oldResources = null;
        try {
            if (getState().isAvailable()) {
                throw new IllegalStateException
                    (sm.getString("standardContext.resources.started"));
            }


            oldResources = this.resources;
            if (oldResources == resources)
                return;


            this.resources = resources;
            if (oldResources != null) {
                oldResources.setContext(null);
            }
            if (resources != null) {
                resources.setContext(this);
            }

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                log.warn(sm.getString(
                        "standardContext.backgroundProcess.manager", manager),
                        e);
            }
        }
        WebResourceRoot resources = getResources();
        if (resources != null) {
            try {
                resources.backgroundProcess();
            } catch (Exception e) {
                log.warn(sm.getString(
                        "standardContext.backgroundProcess.resources",
                        resources), e);
            }

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    @Override
    public WebResource getResource(String path) {
        checkPath(path);
        String webAppMount = getWebAppMount();
        WebResourceRoot root = getRoot();
        if (path.startsWith(webAppMount)) {
            File f = file(path.substring(webAppMount.length()), false);
            if (f == null) {
                return new EmptyResource(root, path);
            }

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    @Override
    public WebResource getResource(String path) {
        checkPath(path);


        String webAppMount = getWebAppMount();
        WebResourceRoot root = getRoot();
        if (path.equals(webAppMount)) {
            File f = file("", true);
            if (f == null) {
                return new EmptyResource(root, path);
            }

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        if (path == null ||
                !path.startsWith("/") && GET_RESOURCE_REQUIRE_SLASH)
            throw new MalformedURLException(sm.getString(
                    "applicationContext.requestDispatcher.iae", path));


        WebResourceRoot resources = context.getResources();
        if (resources != null) {
            return resources.getResource(path).getURL();
        }


        return null;
    }

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            return (null);


        if (!path.startsWith("/") && GET_RESOURCE_REQUIRE_SLASH)
            return null;


        WebResourceRoot resources = context.getResources();
        if (resources != null) {
            return resources.getResource(path).getInputStream();
        }


        return null;
    }

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        if (!path.startsWith("/")) {
            throw new IllegalArgumentException
                (sm.getString("applicationContext.resourcePaths.iae", path));
        }


        WebResourceRoot resources = context.getResources();
        if (resources != null) {
            return resources.listWebAppPaths(path);
        }


        return null;
    }

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    @Override
    public void setResources(WebResourceRoot resources) {


        Lock writeLock = resourcesLock.writeLock();
        writeLock.lock();
        WebResourceRoot oldResources = null;
        try {
            if (getState().isAvailable()) {
                throw new IllegalStateException
                    (sm.getString("standardContext.resources.started"));
            }


            oldResources = this.resources;
            if (oldResources == resources)
                return;


            this.resources = resources;
            if (oldResources != null) {
                oldResources.setContext(null);
            }
            if (resources != null) {
                resources.setContext(this);
            }

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