com.threewks.thundr.bind.http.request.RequestHeaderBinder.java Source code

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Here is the source code for com.threewks.thundr.bind.http.request.RequestHeaderBinder.java

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/*
 * This file is a component of thundr, a software library from 3wks.
 * Read more: http://3wks.github.io/thundr/
 * Copyright (C) 2014 3wks, <thundr@3wks.com.au>
 *
 * 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 com.threewks.thundr.bind.http.request;

import static com.atomicleopard.expressive.Expressive.list;

import java.util.Enumeration;
import java.util.HashMap;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.lang3.StringUtils;
import org.apache.commons.lang3.text.WordUtils;

import com.atomicleopard.expressive.Expressive;
import com.threewks.thundr.bind.Binder;
import com.threewks.thundr.bind.parameter.ParameterBinderRegistry;
import com.threewks.thundr.introspection.ParameterDescription;

import jodd.util.StringPool;

public class RequestHeaderBinder implements Binder {
    private ParameterBinderRegistry parameterBinderRegistry;

    public RequestHeaderBinder(ParameterBinderRegistry parameterBinderRegistry) {
        super();
        this.parameterBinderRegistry = parameterBinderRegistry;
    }

    @Override
    public void bindAll(Map<ParameterDescription, Object> bindings, HttpServletRequest req,
            HttpServletResponse resp, Map<String, String> pathVariables) {
        Map<String, String[]> parameterMap = createNormalisedHeaderMap(req);
        parameterBinderRegistry.bind(bindings, parameterMap, null);
    }

    @SuppressWarnings("unchecked")
    private Map<String, String[]> createNormalisedHeaderMap(HttpServletRequest req) {
        Map<String, String[]> results = new HashMap<String, String[]>();
        Enumeration<String> headerNames = req.getHeaderNames();
        if (headerNames != null) {
            for (String name : Expressive.iterable(headerNames)) {
                String[] values = headerValues(req.getHeaders(name));
                results.put(normaliseHeaderName(name), values);
            }
        }
        return results;
    }

    String normaliseHeaderName(String header) {
        String capitalised = WordUtils.capitalizeFully(header, '-');
        String withoutDashes = capitalised.replaceAll(StringPool.DASH, StringPool.EMPTY);
        return StringUtils.uncapitalize(withoutDashes);
    }

    private String[] headerValues(Enumeration<String> headers) {
        return list(Expressive.iterable(headers)).toArray(new String[0]);
    }
}