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package com.sun.jersey.server.linking.el;
import com.sun.jersey.api.uri.UriTemplateParser;
import com.sun.jersey.server.linking.Ref;
import com.sun.jersey.server.linking.impl.RefDescriptor;
import java.net.URI;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.el.ExpressionFactory;
import javax.el.ValueExpression;
import javax.ws.rs.core.UriBuilder;
import javax.ws.rs.core.UriInfo;
/**
*
* @author mh124079
*/
public class LinkBuilder {
private static ExpressionFactory expressionFactory =
ExpressionFactory.newInstance();
public static boolean evaluateCondition(String condition, Object entity,
Object resource, Object instance) {
if (condition==null || condition.length()==0)
return true;
LinkELContext context = new LinkELContext(entity, resource, instance);
ValueExpression expr = expressionFactory.createValueExpression(context,
condition, boolean.class);
Object result = expr.getValue(context).toString();
return result.equals("true");
}
public static URI buildURI(RefDescriptor link, Object entity, Object resource, Object instance,
UriInfo uriInfo) {
String template = link.getLinkTemplate();
// first process any embedded EL expressions
LinkELContext context = new LinkELContext(entity, resource, instance);
ValueExpression expr = expressionFactory.createValueExpression(context,
template, String.class);
template = expr.getValue(context).toString();
// now process any embedded URI template parameters
UriBuilder ub=applyLinkStyle(template, link.getLinkStyle(), uriInfo);
UriTemplateParser parser = new UriTemplateParser(template);
List parameterNames = parser.getNames();
Map valueMap = getParameterValues(parameterNames, link, context);
URI uri = ub.buildFromMap(valueMap);
return uri;
}
private static UriBuilder applyLinkStyle(String template, Ref.Style style, UriInfo uriInfo) {
UriBuilder ub=null;
switch (style) {
case ABSOLUTE:
ub = uriInfo.getBaseUriBuilder().path(template);
break;
case ABSOLUTE_PATH:
String basePath = uriInfo.getBaseUri().getPath();
ub = UriBuilder.fromPath(basePath).path(template);
break;
case RELATIVE_PATH:
ub = UriBuilder.fromPath(template);
break;
}
return ub;
}
private static Map getParameterValues(List parameterNames, RefDescriptor linkField, LinkELContext context) {
Map values = new HashMap();
for (String name: parameterNames) {
String elExpression = getEL(name, linkField);
ValueExpression expr = expressionFactory.createValueExpression(context,
elExpression, String.class);
Object value = expr.getValue(context);
values.put(name, value);
}
return values;
}
private static String getEL(String name, RefDescriptor linkField) {
String binding = linkField.getBinding(name);
if (binding != null)
return binding;
StringBuilder builder = new StringBuilder();
builder.append("${");
builder.append(ResponseContextResolver.INSTANCE_OBJECT);
builder.append(".");
builder.append(name);
builder.append("}");
return builder.toString();
}
}
