co.cask.cdap.internal.app.runtime.service.http.DefaultHttpServiceRequest.java Source code

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Here is the source code for co.cask.cdap.internal.app.runtime.service.http.DefaultHttpServiceRequest.java

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/*
 * Copyright  2014 Cask Data, Inc.
 *
 * 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 co.cask.cdap.internal.app.runtime.service.http;

import co.cask.cdap.api.service.http.HttpServiceRequest;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMultimap;
import com.google.common.collect.Multimap;
import org.jboss.netty.handler.codec.http.HttpRequest;

import java.nio.ByteBuffer;
import java.util.Collection;
import java.util.List;
import java.util.Map;

/**
 * Implementation of {@link HttpServiceRequest} which delegates calls to
 * the HttpServiceRequest's methods to the matching methods for a {@link HttpRequest}.
 */
final class DefaultHttpServiceRequest implements HttpServiceRequest {

    private final HttpRequest request;
    private final ByteBuffer content;
    private final Multimap<String, String> headers;

    /**
     * Instantiates the class from a {@link HttpRequest}
     *
     * @param request the request which will be bound to.
     */
    DefaultHttpServiceRequest(HttpRequest request) {
        this.request = request;
        this.content = request.getContent().toByteBuffer();

        final ImmutableMultimap.Builder<String, String> builder = ImmutableMultimap.builder();
        for (Map.Entry<String, String> header : request.getHeaders()) {
            builder.put(header);
        }
        this.headers = builder.build();
    }

    /**
     * @return the method of the request
     */
    @Override
    public String getMethod() {
        return request.getMethod().toString();
    }

    /**
     * @return the URI of the request
     */
    @Override
    public String getRequestURI() {
        return request.getUri();
    }

    /**
     * @return the data content of the request as a ByteBuffer
     */
    @Override
    public ByteBuffer getContent() {
        return content.duplicate().asReadOnlyBuffer();
    }

    /**
     * @return the headers of this request; each header name can map to multiple values
     */
    @Override
    public Multimap<String, String> getHeaders() {
        return headers;
    }

    /**
     * Returns all of the values for a specified header.
     *
     * @param key the header to find
     * @return all of the values for the header with the specified key
     */
    @Override
    public List<String> getHeaders(String key) {
        return ImmutableList.copyOf(headers.get(key));
    }

    /**
     * Returns the first value for the specified header.
     *
     * @param key the header to find
     * @return the value of the specified header; if the header maps to multiple values,
     * then the first value is returned
     */
    @Override
    public String getHeader(String key) {
        Collection<String> values = headers.get(key);
        return values.isEmpty() ? null : values.iterator().next();
    }
}