io.dyn.net.Message.java Source code

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Here is the source code for io.dyn.net.Message.java

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/*
 * Copyright (c) 2011-2012 by the original author or authors.
 *
 * 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 io.dyn.net;

import java.util.Arrays;
import java.util.Collection;
import java.util.Map;

import com.google.common.collect.ArrayListMultimap;
import com.google.common.collect.ListMultimap;
import com.google.common.collect.Multimaps;
import io.dyn.core.EventedBase;
import io.dyn.core.Promise;
import io.dyn.net.nio.Buffer;
import org.springframework.http.MediaType;

/**
 * @author Jon Brisbin <jon@jbrisbin.com>
 */
public abstract class Message<M extends Message<? super M>> extends EventedBase<M> implements Writable<Buffer, M> {

    protected int contentLength = 0;
    protected MediaType contentType;
    protected final ListMultimap<String, String> headers = ArrayListMultimap.create();
    protected Buffer contentBuffer = new Buffer();
    protected Promise<Buffer> content;

    public Collection<String> headers(String header) {
        return headers.get(header);
    }

    public String header(String header) {
        return first(header);
    }

    public M header(String header, String val) {
        return header(header, val, false);
    }

    @SuppressWarnings({ "unchecked" })
    public M header(String header, String val, boolean add) {
        switch (header.toLowerCase()) {
        case "content-length":
            contentLength = Integer.parseInt(val);
            break;
        case "content-type":
            contentType = MediaType.parseMediaType(val);
            break;
        }
        if (add) {
            headers.put(header.toLowerCase(), val);
        } else {
            headers.replaceValues(header.toLowerCase(), Arrays.asList(val));
        }
        return (M) this;
    }

    public Map<String, Collection<String>> headers() {
        return Multimaps.unmodifiableListMultimap(headers).asMap();
    }

    public int contentLength() {
        return contentLength;
    }

    public MediaType contentType() {
        return contentType;
    }

    public synchronized Promise<Buffer> content() {
        if (null == content) {
            if (contentLength > 0 && contentLength == contentBuffer.remaining()) {
                content = Promise.wrap(contentBuffer);
            } else {
                content = new Promise<>();
            }
        }
        return content;
    }

    @SuppressWarnings({ "unchecked" })
    @Override
    public M write(Buffer buff) {
        contentBuffer.append(buff);
        if (contentLength > 0 && contentLength == contentBuffer.position()) {
            contentBuffer.flip();
            end();
        }
        return (M) this;
    }

    @SuppressWarnings({ "unchecked" })
    public M end() {
        event("end");
        return (M) this;
    }

    @SuppressWarnings({ "unchecked" })
    public M content(Buffer buffer) {
        contentBuffer = buffer;
        if (null == content) {
            content = Promise.wrap(buffer);
        } else {
            this.content.result(buffer);
        }
        if (contentLength == 0 && buffer.remaining() > 0) {
            contentLength = contentBuffer.remaining();
        }
        return (M) this;
    }

    private String first(String header) {
        Collection<String> vals = headers.get(header);
        if (null != vals) {
            if (vals.size() > 0) {
                return vals.iterator().next();
            }
        }
        return null;
    }

    @Override
    public String toString() {
        return "Message{" + "contentLength=" + contentLength + ", headers=" + headers + ", content=" + content
                + '}';
    }

}