headerparaminjectableprovider.java

来自「resetful样式的ws样例,一种面向资源的webservices服务」· Java 代码 · 共 94 行

/*
 *
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 * 
 * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
 * 
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License. You can obtain
 * a copy of the License at https://jersey.dev.java.net/CDDL+GPL.html
 * or jersey/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 * 
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at jersey/legal/LICENSE.txt.
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 * as provided by Sun in the GPL Version 2 section of the License file that
 * accompanied this code.  If applicable, add the following below the License
 * Header, with the fields enclosed by brackets [] replaced by your own
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 * and therefore, elected the GPL Version 2 license, then the option applies
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 */

package com.sun.jersey.impl.model.parameter;

import com.sun.jersey.api.container.ContainerException;
import com.sun.jersey.impl.model.parameter.multivalued.MultivaluedParameterExtractor;
import com.sun.jersey.impl.model.parameter.multivalued.MultivaluedParameterProcessor;
import com.sun.jersey.api.core.HttpContext;
import com.sun.jersey.api.model.Parameter;
import com.sun.jersey.spi.inject.Injectable;
import com.sun.jersey.spi.inject.InjectableProvider;
import com.sun.jersey.spi.service.ComponentContext;
import com.sun.jersey.spi.service.ComponentProvider.Scope;
import javax.ws.rs.HeaderParam;
import javax.ws.rs.WebApplicationException;

/**
 *
 * @author [e-mail]
 */
public final class HeaderParamInjectableProvider implements 
        InjectableProvider<HeaderParam, Parameter> {

    private static final class HeaderParamInjectable implements Injectable<Object> {
        private MultivaluedParameterExtractor extractor;
        
        HeaderParamInjectable(MultivaluedParameterExtractor extractor) {
            this.extractor = extractor;
        }

        public Object getValue(HttpContext context) {
            try {
                return extractor.extract(context.getRequest().getRequestHeaders());
            } catch (ContainerException e) {
                throw new WebApplicationException(e.getCause(), 400);
            }
        }
    }
    
    public Scope getScope() {
        return Scope.PerRequest;
    }
    
    public Injectable getInjectable(ComponentContext ic, HeaderParam a, Parameter c) {
        String parameterName = c.getSourceName();
        if (parameterName == null || parameterName.length() == 0) {
            // Invalid header parameter name
            return null;
        }
        
        MultivaluedParameterExtractor e =  MultivaluedParameterProcessor.
                process(c.getDefaultValue(), c.getParameterClass(), 
                c.getParameterType(), parameterName);
        if (e == null)
            return null;
        
        return new HeaderParamInjectable(e);
    }
}