com.tinspx.util.io.charset.DefaultHeaderCharDet.java Source code

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Here is the source code for com.tinspx.util.io.charset.DefaultHeaderCharDet.java

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/* Copyright (C) 2013-2014 Ian Teune <ian.teune@gmail.com>
 * 
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 * 
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
package com.tinspx.util.io.charset;

import com.google.common.net.HttpHeaders;
import com.tinspx.util.base.Errors;
import com.tinspx.util.net.Headers;
import java.util.List;
import lombok.ToString;

/**
 * Attempts to detect the {@code Charset} from the Content-Type html header.
 * {@code Charset} detection is very lenient and uses
 * {@link Headers#parseContentType(java.lang.CharSequence)} internally.
 *
 * @author Ian
 */
@ToString(callSuper = true)
public class DefaultHeaderCharDet extends AbstractHeaderCharDet {

    @Override
    public void onHeader(String name, String value) {
        if (complete) {
            return;
        }
        if (name == null) {
            onError(Errors.create("null header name; values=%s", value));
            return;
        }
        name = name.trim();
        if (name.endsWith(":")) {
            name = name.substring(0, name.length() - 1).trim();
        }
        if (HttpHeaders.CONTENT_TYPE.equalsIgnoreCase(name)) {
            List<String> charsets = CharsetUtils.parseCharsetString(value);
            if (!setFirstValid(charsets)) {
                onError(Errors.create(this, "invalid charset; value=%s, charsets=%s", value, charsets));
            }
        }
    }

    @Override
    public DefaultHeaderCharDet duplicate() {
        return new DefaultHeaderCharDet();
    }
}