org.databene.formats.fixedwidth.ArrayFixedWidthWriter Maven / Gradle / Ivy

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/*
 * Copyright (C) 2011-2015 Volker Bergmann ([email protected]).
 * 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.databene.formats.fixedwidth;

import org.databene.commons.Context;
import org.databene.commons.ConversionException;
import org.databene.commons.SystemInfo;
import org.databene.formats.script.AbstractScript;
import org.databene.formats.script.Script;
import org.databene.formats.script.ScriptException;
import org.databene.formats.script.ScriptUtil;
import org.databene.formats.script.ScriptedDocumentWriter;

import java.io.IOException;
import java.io.Writer;

/**
 * Writes arrays as flat file columns.
 * Created: 07.06.2007 13:05:38
 * @param  the type of the objects to write
 * @author Volker Bergmann
 */
public class ArrayFixedWidthWriter extends ScriptedDocumentWriter {

    public ArrayFixedWidthWriter(Writer out, FixedWidthRowTypeDescriptor descriptor) {
        this(out, (Script) null, (Script) null, descriptor);
    }

    public ArrayFixedWidthWriter(Writer out, String headerScriptUrl, String footerScriptUrl, FixedWidthRowTypeDescriptor descriptor)
            throws IOException {
        this(
            out,
            (headerScriptUrl != null ? ScriptUtil.readFile(headerScriptUrl) : null),
            (footerScriptUrl != null ? ScriptUtil.readFile(footerScriptUrl) : null),
            descriptor
        );
    }

    public ArrayFixedWidthWriter(Writer out, Script headerScript, Script footerScript, FixedWidthRowTypeDescriptor descriptors) {
        super(
            out,
            headerScript,
            new ArrayFixedWidthScript(descriptors),
            footerScript
        );
    }

    // ArrayFlatFileScript ---------------------------------------------------------------------------------------------

    private static class ArrayFixedWidthScript extends AbstractScript {

        private FixedWidthRowTypeDescriptor descriptor;

        public ArrayFixedWidthScript(FixedWidthRowTypeDescriptor descriptor) {
            this.descriptor = descriptor;
        }

        @Override
        public void execute(Context context, Writer out) throws IOException, ScriptException {
            try {
                Object[] cellsOfCurrentRow = (Object[]) context.get("part");
                out.write(descriptor.formatArray(cellsOfCurrentRow));
                out.write(SystemInfo.getLineSeparator());
            } catch (ConversionException e) {
                throw new ScriptException(e);
            }
        }
    }

}