Example usage for org.springframework.web.context.support GenericWebApplicationContext getParent

Introduction

In this page you can find the example usage for org.springframework.web.context.support GenericWebApplicationContext getParent.

Prototype

@Override
@Nullable
public ApplicationContext getParent() 

Source Link

Document

Return the parent context, or null if there is no parent (that is, this context is the root of the context hierarchy).

Usage

From source file:org.springframework.test.context.web.AbstractGenericWebContextLoader.java

/**
 * Configures web resources for the supplied web application context (WAC).
 * <h4>Implementation Details</h4>
 * <p>If the supplied WAC has no parent or its parent is not a WAC, the
 * supplied WAC will be configured as the Root WAC (see "<em>Root WAC
 * Configuration</em>" below).//from w w  w  .  ja v a2  s  . c o  m
 * <p>Otherwise the context hierarchy of the supplied WAC will be traversed
 * to find the top-most WAC (i.e., the root); and the {@link ServletContext}
 * of the Root WAC will be set as the {@code ServletContext} for the supplied
 * WAC.
 * <h4>Root WAC Configuration</h4>
 * <ul>
 * <li>The resource base path is retrieved from the supplied
 * {@code WebMergedContextConfiguration}.</li>
 * <li>A {@link ResourceLoader} is instantiated for the {@link MockServletContext}:
 * if the resource base path is prefixed with "{@code classpath:}", a
 * {@link DefaultResourceLoader} will be used; otherwise, a
 * {@link FileSystemResourceLoader} will be used.</li>
 * <li>A {@code MockServletContext} will be created using the resource base
 * path and resource loader.</li>
 * <li>The supplied {@link GenericWebApplicationContext} is then stored in
 * the {@code MockServletContext} under the
 * {@link WebApplicationContext#ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE} key.</li>
 * <li>Finally, the {@code MockServletContext} is set in the
 * {@code WebApplicationContext}.</li>
 * @param context the web application context for which to configure the web resources
 * @param webMergedConfig the merged context configuration to use to load the web application context
 */
protected void configureWebResources(GenericWebApplicationContext context,
        WebMergedContextConfiguration webMergedConfig) {

    ApplicationContext parent = context.getParent();

    // If the WebApplicationContext has no parent or the parent is not a WebApplicationContext,
    // set the current context as the root WebApplicationContext:
    if (parent == null || (!(parent instanceof WebApplicationContext))) {
        String resourceBasePath = webMergedConfig.getResourceBasePath();
        ResourceLoader resourceLoader = (resourceBasePath.startsWith(ResourceLoader.CLASSPATH_URL_PREFIX)
                ? new DefaultResourceLoader()
                : new FileSystemResourceLoader());
        ServletContext servletContext = new MockServletContext(resourceBasePath, resourceLoader);
        servletContext.setAttribute(WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE, context);
        context.setServletContext(servletContext);
    } else {
        ServletContext servletContext = null;
        // Find the root WebApplicationContext
        while (parent != null) {
            if (parent instanceof WebApplicationContext
                    && !(parent.getParent() instanceof WebApplicationContext)) {
                servletContext = ((WebApplicationContext) parent).getServletContext();
                break;
            }
            parent = parent.getParent();
        }
        Assert.state(servletContext != null,
                "Failed to find root WebApplicationContext in the context hierarchy");
        context.setServletContext(servletContext);
    }
}

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