org.paxml.file.LineBasedFile.java Source code

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Here is the source code for org.paxml.file.LineBasedFile.java

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/**
 * This file is part of PaxmlCore.
 *
 * PaxmlCore is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * PaxmlCore 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with PaxmlCore.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.paxml.file;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.Iterator;

import org.apache.poi.util.IOUtils;
import org.paxml.core.PaxmlRuntimeException;
import org.paxml.util.PaxmlUtils;
import org.springframework.core.io.Resource;

public class LineBasedFile implements Iterator<String>, IFile {
    private final BufferedReader reader;
    private final String name;
    private String line;

    public LineBasedFile(Resource file, String encoding) {
        name = PaxmlUtils.getResourceFile(file);
        InputStream in = null;
        try {
            in = file.getInputStream();
            reader = new BufferedReader(new InputStreamReader(in, encoding == null ? "UTF-8" : encoding));
            // cache the 1st line
            line = reader.readLine();
        } catch (IOException e) {
            IOUtils.closeQuietly(in);
            throw new PaxmlRuntimeException("Cannot read file: " + name, e);
        }
    }

    @Override
    public boolean hasNext() {
        return line != null;
    }

    @Override
    public String next() {
        String result = line;
        try {
            // advance the cached line
            line = reader.readLine();
        } catch (IOException e) {
            line = null;
            IOUtils.closeQuietly(reader);
            throw new PaxmlRuntimeException("Cannot read file: " + name, e);
        }
        return result;
    }

    @Override
    public void remove() {
        throw new UnsupportedOperationException();
    }

    @Override
    public void close() {
        IOUtils.closeQuietly(reader);
    }

    @Override
    public void flush() throws IOException {
        // do nothing
    }

    @Override
    public boolean isReadonly() {
        return true;
    }

    @Override
    public String getResourceIdentifier() {
        return name;
    }

}