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/*
 * Copyright (c) 2008, The Codehaus. All Rights Reserved.
 *
 *   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 org.codehaus.httpcache4j;

import org.apache.commons.lang.Validate;

import java.io.Serializable;
import java.util.*;

/** @author Erlend Hamnaberg */
public final class Headers implements Serializable, Iterable>> {
    public static final String PATTERN_RFC1123 = "EEE, dd MMM yyyy HH:mm:ss zzz";
    private Map> headers = new HashMap>();

    public Headers() {
    }

    public Headers(Map> headers) {
        Validate.notEmpty(headers);
        this.headers.putAll(headers);
    }

    public List getHeaders(String headerKey) {
        return headers.get(headerKey);
    }

    public Header getFirstHeader(String headerKey) {
        List headerList = headers.get(headerKey);
        if (headerList != null) {
            return headerList.get(0);
        }
        return null;
    }

    public String getFirstHeaderValue(String headerKey) {
        Header header = getFirstHeader(headerKey);
        if (header != null) {
            return header.getValue();
        }
        return null;
    }

    public void add(Header header) {
        List list = headers.get(header.getName());
        if (list == null) {
            list = new ArrayList();
            headers.put(header.getName(), list);
        }
        if (!list.contains(header)) {
            list.add(header);
        }
    }

    public void add(String key, String value) {
        add(new Header(key, value));
    }

    public boolean contains(Header header) {
        List values = headers.get(header.getName());
        return values != null && values.contains(header);
    }

    public Map> getHeadersAsMap() {
        return Collections.unmodifiableMap(headers);
    }

    public Iterator>> iterator() {
        return getHeadersAsMap().entrySet().iterator();
    }

    public Set keySet() {
        return headers.keySet();
    }

    public boolean hasHeader(String headerName) {
        return headers.get(headerName) != null;
    }

    public void put(String name, List headers) {
        this.headers.put(name, headers);
    }

    public void remove(String name) {
        headers.remove(name);
    }

    public int size() {
        return headers.size();
    }

    public boolean isEmpty() {
        return headers.isEmpty();
    }
}