org.glassfish.grizzly.servlet.ServletRegistration Maven / Gradle / Ivy
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package org.glassfish.grizzly.servlet;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Set;
import javax.servlet.MultipartConfigElement;
import javax.servlet.Servlet;
import javax.servlet.ServletSecurityElement;
import org.glassfish.grizzly.utils.ArraySet;
/**
* Allows customization of a {@link javax.servlet.Servlet} registered with the {@link WebappContext}.
*
* @since 2.2
*/
public class ServletRegistration extends Registration
implements javax.servlet.ServletRegistration.Dynamic, Comparable {
protected Class servletClass;
protected final ArraySet urlPatterns = new ArraySet(String.class);
protected Servlet servlet;
protected int loadOnStartup = -1;
protected ExpectationHandler expectationHandler;
protected boolean isAsyncSupported;
/**
* The run-as identity for this servlet.
*/
private String runAs = null;
// ------------------------------------------------------------ Constructors
/**
* Creates a new ServletRegistration associated with the specified
* {@link WebappContext}.
*
* @param ctx the owning {@link WebappContext}.
* @param name the name of the Filter.
* @param servletClassName the fully qualified class name of the {@link Servlet}
* implementation.
*/
protected ServletRegistration(final WebappContext ctx,
final String name,
final String servletClassName) {
super(ctx, name, servletClassName);
this.name = name;
}
/**
* Creates a new ServletRegistration associated with the specified
* {@link WebappContext}.
*
* @param ctx the owning {@link WebappContext}.
* @param name the name of the Filter.
* @param servlet the {@link Servlet} instance.
*/
protected ServletRegistration(final WebappContext ctx,
final String name,
final Servlet servlet) {
this(ctx, name, servlet.getClass());
this.servlet = servlet;
}
/**
* Creates a new ServletRegistration associated with the specified
* {@link WebappContext}.
*
* @param ctx the owning {@link WebappContext}.
* @param name the name of the Filter.
* @param servletClass the class of the {@link Servlet} implementation.
*/
protected ServletRegistration(final WebappContext ctx,
final String name,
final Class servletClass) {
this(ctx, name, servletClass.getName());
this.servletClass = servletClass;
}
// ---------------------------------------------------------- Public Methods
/**
* Adds a servlet mapping with the given URL patterns for the Servlet
* represented by this ServletRegistration.
*
* If any of the specified URL patterns are already mapped to a
* different Servlet, no updates will be performed.
*
*
If this method is called multiple times, each successive call
* adds to the effects of the former.
*
* @param urlPatterns the URL patterns of the servlet mapping
*
* @return the (possibly empty) Set of URL patterns that are already
* mapped to a different Servlet
*
* @throws IllegalArgumentException if urlPatterns is null
* or empty
* @throws IllegalStateException if the ServletContext from which this
* ServletRegistration was obtained has already been initialized
*/
@Override
public Set addMapping(String... urlPatterns) {
if (ctx.deployed) {
throw new IllegalStateException("WebappContext has already been deployed");
}
if (urlPatterns == null || urlPatterns.length == 0) {
throw new IllegalArgumentException("'urlPatterns' cannot be null or zero-length");
}
this.urlPatterns.addAll(urlPatterns);
return Collections.emptySet(); // TODO - need to comply with the spec at some point
}
/**
* Gets the currently available mappings of the
* Servlet represented by this ServletRegistration.
*
* If permitted, any changes to the returned Collection must not
* affect this ServletRegistration.
*
* @return a (possibly empty) Collection of the currently
* available mappings of the Servlet represented by this
* ServletRegistration
*/
@Override
public Collection getMappings() {
return Collections.unmodifiableList(
Arrays.asList(urlPatterns.getArrayCopy()));
}
/**
* Sets the loadOnStartup priority on the Servlet
* represented by this dynamic ServletRegistration.
*
* A loadOnStartup value of greater than or equal to
* zero indicates to the container the initialization priority of
* the Servlet. In this case, the container must instantiate and
* initialize the Servlet during the initialization phase of the
* WebappContext, that is, after it has invoked all of the
* ServletContextListener objects configured for the WebappContext
* at their {@link javax.servlet.ServletContextListener#contextInitialized}
* method.
*
* If loadOnStartup is a negative integer, the container
* is free to instantiate and initialize the Servlet lazily.
*
* The default value for loadOnStartup is -1.
*
* A call to this method overrides any previous setting.
*
* @param loadOnStartup the initialization priority of the Servlet
* @throws IllegalStateException if the ServletContext from which
* this ServletRegistration was obtained has already been initialized
*/
@Override
public void setLoadOnStartup(int loadOnStartup) {
if (ctx.deployed) {
throw new IllegalStateException("WebappContext has already been deployed");
}
if (loadOnStartup < 0) {
this.loadOnStartup = -1;
} else {
this.loadOnStartup = loadOnStartup;
}
}
/**
* Get the {@link ExpectationHandler} responsible for processing
* Expect: header (for example "Expect: 100-Continue").
*
* @return the {@link ExpectationHandler} responsible for processing
* Expect: header (for example "Expect: 100-Continue").
*/
public ExpectationHandler getExpectationHandler() {
return expectationHandler;
}
/**
* {@inheritDoc}
*/
@Override
public Set setServletSecurity(ServletSecurityElement constraint) {
return Collections.emptySet();
}
/**
* {@inheritDoc}
*/
@Override
public void setMultipartConfig(MultipartConfigElement multipartConfig) {
throw new UnsupportedOperationException("Not supported yet.");
}
/**
* {@inheritDoc}
*/
@Override
public String getRunAsRole() {
return runAs;
}
/**
* {@inheritDoc}
*/
@Override
public void setRunAsRole(String roleName) {
this.runAs = roleName;
}
/**
* {@inheritDoc}
*/
@Override
public void setAsyncSupported(boolean isAsyncSupported) {
this.isAsyncSupported = isAsyncSupported;
}
/**
* Set the {@link ExpectationHandler} responsible for processing
* Expect: header (for example "Expect: 100-Continue").
*
* @param expectationHandler the {@link ExpectationHandler} responsible
* for processing Expect: header (for example "Expect: 100-Continue").
*/
public void setExpectationHandler(ExpectationHandler expectationHandler) {
this.expectationHandler = expectationHandler;
}
@Override
public String toString() {
final StringBuilder sb = new StringBuilder();
sb.append("ServletRegistration");
sb.append("{ servletName=").append(name);
sb.append(", servletClass=").append(className);
sb.append(", urlPatterns=").append(Arrays.toString(urlPatterns.getArray()));
sb.append(", loadOnStartup=").append(loadOnStartup);
sb.append(", isAsyncSupported=").append(isAsyncSupported);
sb.append(" }");
return sb.toString();
}
// ------------------------------------------------- Methods from Comparable
@Override
public int compareTo(ServletRegistration o) {
if (loadOnStartup == o.loadOnStartup) {
return 0;
}
if (loadOnStartup < 0 && o.loadOnStartup < 0) {
return -1;
}
if (loadOnStartup >= 0 && o.loadOnStartup >= 0) {
if (loadOnStartup < o.loadOnStartup) {
return -1;
}
}
return 1;
}
}