| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 org.apache.hadoop.lib.wsrs; |
| |
| import com.sun.jersey.api.core.HttpContext; |
| import com.sun.jersey.core.spi.component.ComponentContext; |
| import com.sun.jersey.core.spi.component.ComponentScope; |
| import com.sun.jersey.server.impl.inject.AbstractHttpContextInjectable; |
| import com.sun.jersey.spi.inject.Injectable; |
| import com.sun.jersey.spi.inject.InjectableProvider; |
| import org.apache.hadoop.classification.InterfaceAudience; |
| |
| import javax.ws.rs.core.Context; |
| import javax.ws.rs.core.MultivaluedMap; |
| import java.lang.reflect.Type; |
| import java.text.MessageFormat; |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| /** |
| * Jersey provider that parses the request parameters based on the |
| * given parameter definition. |
| */ |
| @InterfaceAudience.Private |
| public class ParametersProvider |
| extends AbstractHttpContextInjectable<Parameters> |
| implements InjectableProvider<Context, Type> { |
| |
| private String driverParam; |
| private Class<? extends Enum> enumClass; |
| private Map<Enum, Class<Param<?>>[]> paramsDef; |
| |
| public ParametersProvider(String driverParam, Class<? extends Enum> enumClass, |
| Map<Enum, Class<Param<?>>[]> paramsDef) { |
| this.driverParam = driverParam; |
| this.enumClass = enumClass; |
| this.paramsDef = paramsDef; |
| } |
| |
| @Override |
| @SuppressWarnings("unchecked") |
| public Parameters getValue(HttpContext httpContext) { |
| Map<String, Param<?>> map = new HashMap<String, Param<?>>(); |
| MultivaluedMap<String, String> queryString = |
| httpContext.getRequest().getQueryParameters(); |
| String str = queryString.getFirst(driverParam); |
| if (str == null) { |
| throw new IllegalArgumentException( |
| MessageFormat.format("Missing Operation parameter [{0}]", |
| driverParam)); |
| } |
| Enum op; |
| try { |
| op = Enum.valueOf(enumClass, str.toUpperCase()); |
| } catch (IllegalArgumentException ex) { |
| throw new IllegalArgumentException( |
| MessageFormat.format("Invalid Operation [{0}]", str)); |
| } |
| if (!paramsDef.containsKey(op)) { |
| throw new IllegalArgumentException( |
| MessageFormat.format("Unsupported Operation [{0}]", op)); |
| } |
| for (Class<Param<?>> paramClass : paramsDef.get(op)) { |
| Param<?> param; |
| try { |
| param = paramClass.newInstance(); |
| } catch (Exception ex) { |
| throw new UnsupportedOperationException( |
| MessageFormat.format( |
| "Param class [{0}] does not have default constructor", |
| paramClass.getName())); |
| } |
| try { |
| param.parseParam(queryString.getFirst(param.getName())); |
| } |
| catch (Exception ex) { |
| throw new IllegalArgumentException(ex.toString(), ex); |
| } |
| map.put(param.getName(), param); |
| } |
| return new Parameters(map); |
| } |
| |
| @Override |
| public ComponentScope getScope() { |
| return ComponentScope.PerRequest; |
| } |
| |
| @Override |
| public Injectable getInjectable(ComponentContext componentContext, Context context, Type type) { |
| return (type.equals(Parameters.class)) ? this : null; |
| } |
| } |