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Modules for processing bibliographic data

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/* Copyright 2016,2019 Christoph Böhme and others
 *
 * 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.metafacture.biblio.pica;

/**
 * Useful constants for PICA+.
 * PICA+ comes with two possible serializations:
 * a normalized one and a non-normalized.
 *
 * @author Christoph Böhme (initial implementation)
 * @author Pascal Christoph (dr0i) (add support for non-normalized pica+)
 * @author Fabian Steeg (fsteeg) (switch to enum)
 *
 */
enum PicaConstants {
    // We use '\0' for null/empty
    RECORD_MARKER('\u001d', '\n'), //
    FIELD_MARKER('\u001e', '\0'), //
    SUBFIELD_MARKER('\u001f', '$'), //
    FIELD_END_MARKER('\n', '\n'), //
    NO_MARKER('\0', '\0');

    private final char normalized;
    private final char nonNormalized;

    PicaConstants(final char normalized, final char nonNormalized) {
        this.normalized = normalized;
        this.nonNormalized = nonNormalized;
    }

    public char get(final boolean isNormalized) {
        return isNormalized ? normalized : nonNormalized;
    }

    public static PicaConstants from(final boolean isNormalized, final char ch) {
        for (final PicaConstants value : values()) {
            if (ch == (isNormalized ? value.normalized : value.nonNormalized)) {
                return value;
            }
        }
        return NO_MARKER;
    }
}