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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.jackrabbit.webdav.header;

import org.apache.jackrabbit.webdav.DavConstants;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.servlet.http.HttpServletRequest;

/**
 * OverwriteHeader...
 */
public class OverwriteHeader implements Header {

    private static Logger log = LoggerFactory.getLogger(OverwriteHeader.class);

    public static final String OVERWRITE_TRUE = "T";
    public static final String OVERWRITE_FALSE = "F";

    /**
     * Set 'doOverwrite' to true by default. See RFC 2518:
     * "If the overwrite header is not included in a COPY or MOVE request then
     * the resource MUST treat the request as if it has an overwrite header of
     * value {@link #OVERWRITE_TRUE}".
     */
    private final boolean doOverwrite;

    public OverwriteHeader(boolean doOverwrite) {
        this.doOverwrite = doOverwrite;
    }

    /**
     * Create a new OverwriteHeader for the given request object.
     * If the latter does not contain an "Overwrite" header field, the default
     * applies, which is {@link #OVERWRITE_TRUE} according to RFC 2518.
     *
     * @param request
     */
    public OverwriteHeader(HttpServletRequest request) {
        String overwriteHeader = request.getHeader(DavConstants.HEADER_OVERWRITE);
        if (overwriteHeader != null) {
            doOverwrite = overwriteHeader.equalsIgnoreCase(OVERWRITE_TRUE);
        } else {
            // no Overwrite header -> default is 'true'
            doOverwrite = true;
        }
    }

    public String getHeaderName() {
        return DavConstants.HEADER_OVERWRITE;
    }

    public String getHeaderValue() {
        return (doOverwrite) ? OVERWRITE_TRUE : OVERWRITE_FALSE;
    }

    public boolean isOverwrite() {
        return doOverwrite;
    }
}