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Jersey support for declarative hyperlinking.
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package org.glassfish.jersey.linking.mapping;
import java.lang.reflect.Type;
import java.util.Deque;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import javax.ws.rs.core.Context;
import org.glassfish.jersey.process.Inflector;
import org.glassfish.jersey.server.ExtendedResourceContext;
import org.glassfish.jersey.server.model.HandlerConstructor;
import org.glassfish.jersey.server.model.Invocable;
import org.glassfish.jersey.server.model.MethodHandler;
import org.glassfish.jersey.server.model.Resource;
import org.glassfish.jersey.server.model.ResourceMethod;
import org.glassfish.jersey.server.model.ResourceModel;
import org.glassfish.jersey.server.model.ResourceModelComponent;
import org.glassfish.jersey.server.model.ResourceModelVisitor;
import org.glassfish.jersey.server.model.RuntimeResource;
import org.glassfish.jersey.uri.PathPattern;
import org.glassfish.jersey.uri.UriTemplate;
/**
* This implementation of the resource mapping context assumed resources are
* of a simple type with a statically defined structure.
*
* @author Gerard Davison (gerard.davison at oracle.com)
*/
public class NaiveResourceMappingContext implements ResourceMappingContext {
private final ExtendedResourceContext erc;
private Map, ResourceMappingContext.Mapping> mappings;
public NaiveResourceMappingContext(@Context final ExtendedResourceContext erc) {
this.erc = erc;
}
@Override
public Mapping getMapping(final Class resource) {
buildMappings();
return mappings.get(resource);
}
private void buildMappings() {
if (mappings != null) {
return;
}
mappings = new HashMap<>();
erc.getResourceModel().accept(new ResourceModelVisitor() {
Deque stack = new LinkedList<>();
private void processComponents(final ResourceModelComponent component) {
final List components = component.getComponents();
if (components != null) {
for (final ResourceModelComponent rc : components) {
rc.accept(this);
}
}
}
@Override
public void visitInvocable(final Invocable invocable) {
processComponents(invocable);
}
@Override
public void visitRuntimeResource(final RuntimeResource runtimeResource) {
processComponents(runtimeResource);
}
@Override
public void visitResourceModel(final ResourceModel resourceModel) {
processComponents(resourceModel);
}
@Override
public void visitResourceHandlerConstructor(final HandlerConstructor handlerConstructor) {
processComponents(handlerConstructor);
}
@Override
public void visitMethodHandler(final MethodHandler methodHandler) {
processComponents(methodHandler);
}
@Override
public void visitChildResource(final Resource resource) {
visitResourceIntl(resource, false);
}
@Override
public void visitResource(final Resource resource) {
visitResourceIntl(resource, true);
}
private void visitResourceIntl(final Resource resource, final boolean isRoot) {
try {
stack.addLast(resource.getPathPattern());
processComponents(resource);
if (isRoot) {
Class likelyToBeRoot = null;
for (final Class next : resource.getHandlerClasses()) {
if (!(Inflector.class.isAssignableFrom(next))) {
likelyToBeRoot = next;
}
}
if (likelyToBeRoot != null) {
mappings.put(likelyToBeRoot, getMapping(getTemplate()));
}
}
} finally {
stack.removeLast();
}
}
@Override
public void visitResourceMethod(final ResourceMethod resourceMethod) {
if (resourceMethod.isExtended()) {
return;
}
if (ResourceMethod.JaxrsType.SUB_RESOURCE_LOCATOR.equals(resourceMethod.getType())) {
if (resourceMethod.getInvocable() != null) {
final Invocable i = resourceMethod.getInvocable();
final Type type = i.getResponseType();
final StringBuilder template = getTemplate();
mappings.put((Class) type, getMapping(template));
// Process sub resources ?
Resource.Builder builder = Resource
.builder(i.getRawResponseType());
if (builder == null) {
// for example in the case the return type of the sub resource locator is Object
builder = Resource.builder().path(resourceMethod.getParent().getPath());
}
final Resource subResource = builder.build();
visitChildResource(subResource);
}
}
processComponents(resourceMethod);
}
private StringBuilder getTemplate() {
final StringBuilder template = new StringBuilder();
for (final PathPattern pp : stack) {
final String ppTemplate = pp.getTemplate().getTemplate();
final int tlength = template.length();
if (tlength > 0) {
if (template.charAt(tlength - 1) == '/') {
if (ppTemplate.startsWith("/")) {
template.append(ppTemplate, 1, ppTemplate.length());
} else {
template.append(ppTemplate);
}
} else {
if (ppTemplate.startsWith("/")) {
template.append(ppTemplate);
} else {
template.append("/");
template.append(ppTemplate);
}
}
} else {
template.append(ppTemplate);
}
}
return template;
}
});
}
private Mapping getMapping(final StringBuilder template) {
return new Mapping() {
UriTemplate uriTemplate = new UriTemplate(template.toString());
@Override
public UriTemplate getTemplate() {
return uriTemplate;
}
};
}
}
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