UrlBuilderProvider.java

/*
 * Copyright 2000-2011 JetBrains s.r.o.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package jetbrains.buildServer.server.rest.jersey;

import com.sun.jersey.core.spi.component.ComponentContext;
import com.sun.jersey.core.spi.component.ComponentScope;
import com.sun.jersey.spi.inject.Injectable;
import com.sun.jersey.spi.inject.InjectableProvider;
import jetbrains.buildServer.server.rest.ApiUrlBuilder;
import jetbrains.buildServer.server.rest.PathTransformator;
import jetbrains.buildServer.server.rest.PathTransformer;
import jetbrains.buildServer.server.rest.RequestPathTransformInfo;
import jetbrains.buildServer.server.rest.request.Constants;

import javax.ws.rs.core.Context;
import javax.ws.rs.core.HttpHeaders;
import javax.ws.rs.ext.Provider;
import java.lang.reflect.Type;

/**
 * @author Yegor.Yarko
 *         Date: 15.11.2009
 */
@Provider
public class UrlBuilderProvider implements InjectableProvider<Context, java.lang.reflect.Type>, Injectable<ApiUrlBuilder> {
  private RequestPathTransformInfo myRequestPathTransformInfo;

  //TODO: using request-specific field in singleton provider
  //TODO: may lead to concurrency issue as this instance is
  //TODO: created by spring not by Jersey!
  @Context private HttpHeaders headers;

  public UrlBuilderProvider(final RequestPathTransformInfo requestPathTransformInfo) {
    myRequestPathTransformInfo = requestPathTransformInfo;
  }

  public ComponentScope getScope() {
    return ComponentScope.PerRequest;
  }

  public Injectable getInjectable(final ComponentContext ic, final Context context, final Type type) {
    if (type.equals(ApiUrlBuilder.class)) {
      return this;
    }
    return null;
  }

  public ApiUrlBuilder getValue() {
    return new ApiUrlBuilder(new PathTransformer() {
      public String transform(final String path) {
        return getRequestTranslator().getTransformedPath(path);
      }
    });
  }

  private PathTransformator getRequestTranslator() {
    final String originalRequestPath =
      headers.getRequestHeader(Constants.ORIGINAL_REQUEST_URI_HEADER_NAME).get(0); //todo report appropriate message
    return myRequestPathTransformInfo.getReverseTransformator(originalRequestPath, false);
  }
}