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The Smooks Flat File Cartridge adds support for reading flat files
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/*-
 * ========================LICENSE_START=================================
 * smooks-flatfile-cartridge
 * %%
 * Copyright (C) 2020 Smooks
 * %%
 * Licensed under the terms of the Apache License Version 2.0, or
 * the GNU Lesser General Public License version 3.0 or later.
 *
 * SPDX-License-Identifier: Apache-2.0 OR LGPL-3.0-or-later
 *
 * ======================================================================
 *
 * 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.
 *
 * ======================================================================
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 * =========================LICENSE_END==================================
 */
package org.smooks.cartridges.flatfile;

import org.smooks.assertion.AssertArgument;
import org.smooks.cartridges.flatfile.function.StringFunctionExecutor;

/**
 * Flat file record field metadata.
 *
 * @author [email protected]
 */
public class FieldMetaData {

    public static final String IGNORE_FIELD = "$ignore$";

    private String name;
    private boolean ignore;
    private int ignoreCount;

    private StringFunctionExecutor stringFunctionExecutor;

    public FieldMetaData(String name) {
        AssertArgument.isNotNullAndNotEmpty(name, "name");
        this.name = name;
        ignore = name.startsWith(IGNORE_FIELD);
        if (ignore) {
            ignoreCount = parseIgnoreFieldDirective(name);
        }
    }

    public String getName() {
        return name;
    }

    public boolean ignore() {
        return ignore;
    }

    public int getIgnoreCount() {
        return ignoreCount;
    }

    public StringFunctionExecutor getStringFunctionExecutor() {
        return stringFunctionExecutor;
    }

    public FieldMetaData setStringFunctionExecutor(StringFunctionExecutor stringFunctionExecutor) {
        this.stringFunctionExecutor = stringFunctionExecutor;
        return this;
    }

    @Override
    public String toString() {
        return String.format("%s[name=%s,stringFunctionExecutor=%s]", this, name, stringFunctionExecutor);
    }

    private int parseIgnoreFieldDirective(String field) {
        String op = field.substring(IGNORE_FIELD.length());
        int toSkip = 0;
        if (op.length() == 0) {
            toSkip = 1;
        } else if ("+".equals(op)) {
            toSkip = Integer.MAX_VALUE;
        } else {
            toSkip = Integer.parseInt(op);
        }
        return toSkip;
    }
}