net.ageto.gyrex.impex.common.steps.impl.readers.FileReaderLineBased.java Source code

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Here is the source code for net.ageto.gyrex.impex.common.steps.impl.readers.FileReaderLineBased.java

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/*******************************************************************************
 * Copyright (c) 2010 AGETO Service GmbH and others.
 * All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
 * and is available at http://www.eclipse.org/legal/epl-v10.html.
 *
 * Contributors:
 *     Mario Mokros - initial API and implementation
 *******************************************************************************/
package net.ageto.gyrex.impex.common.steps.impl.readers;

import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;

import net.ageto.gyrex.impex.common.steps.internal.ImpexStepsActivator;
import net.ageto.gyrex.impex.impl.BaseProcessStep;

import org.apache.commons.lang.StringUtils;

/**
 * A line based file reader.
 *
 */
public class FileReaderLineBased extends BaseProcessStep<FileReaderLineBasedDefinition> {

    public static final String ID = ImpexStepsActivator.SYMBOLIC_NAME + ".file.reader.line.based";

    public FileReaderLineBased() {
        super(FileReaderLineBasedDefinition.class);
    }

    @Override
    protected StatusStep process() {

        String filename = (String) getInputParam(
                FileReaderLineBasedDefinition.InputParamNames.INPUT_FILENAME.name());

        if (StringUtils.isBlank(filename)) {
            processError("The given file name \"{0}\" is invalid.", filename);
            return StatusStep.ERROR;
        }

        // charset (default is ISO-8859-1)
        String charset = StringUtils.defaultIfEmpty(
                (String) getInputParam(FileReaderLineBasedDefinition.InputParamNames.INPUT_CHARSET.name()),
                "ISO-8859-1");

        StringBuffer output = new StringBuffer();
        try {
            BufferedReader in = new BufferedReader(new InputStreamReader(new FileInputStream(filename), charset));

            String str;
            while ((str = in.readLine()) != null) {
                output.append(str);
                output.append(System.getProperty("line.separator"));
            }
            in.close();
        } catch (IOException e) {
            processError(e.getMessage());
            return StatusStep.ERROR;
        }

        setOutputParam(FileReaderLineBasedDefinition.OutputParamNames.OUTPUT_FILECONTENT.name(), output);

        processInfo("{0} has been completed successfully.", ID);

        return StatusStep.OK;
    }

}