net.sf.jsefa.csv.CsvDeserializerImpl Maven / Gradle / Ivy

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JSefa (Java Simple exchange format api) is a simple library for stream-based serialization of java objects to XML, CSV, FLR or any other format and back again using an iterator-style interface independent of the serialization format. The mapping between java object types and types of the serialization format (e. g. xml complex element types) can be defined either by annotating the java classes or programmatically using a simple API. The current implementation supports XML, CSV and FLR - for XML it is based on JSR 173.

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/*
 * Copyright 2007 the original author or authors.
 *
 * 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 net.sf.jsefa.csv;

import java.util.Map;

import net.sf.jsefa.common.mapping.SimpleTypeMapping;
import net.sf.jsefa.csv.config.CsvConfiguration;
import net.sf.jsefa.csv.lowlevel.CsvLowLevelDeserializer;
import net.sf.jsefa.csv.lowlevel.config.QuoteMode;
import net.sf.jsefa.csv.mapping.CsvSimpleTypeMapping;
import net.sf.jsefa.rbf.RbfDeserializerImpl;
import net.sf.jsefa.rbf.mapping.RbfEntryPoint;

/**
 * Default implementation of {@link CsvDeserializer} based on {@link RbfDeserializerImpl}.
 * 
 * @author Norman Lahme-Huetig
 * 
 */
public final class CsvDeserializerImpl extends RbfDeserializerImpl implements CsvDeserializer {

    private final CsvLowLevelDeserializer lowLevelDeserializer;

    CsvDeserializerImpl(CsvConfiguration config, Map entryPointsByPrefixes,
            CsvLowLevelDeserializer lowLevelDeserializer) {
        super(config, entryPointsByPrefixes);
        this.lowLevelDeserializer = lowLevelDeserializer;
    }

    CsvDeserializerImpl(CsvConfiguration config, RbfEntryPoint entryPoint,
            CsvLowLevelDeserializer lowLevelDeserializer) {
        super(config, entryPoint);
        this.lowLevelDeserializer = lowLevelDeserializer;
    }

    /**
     * {@inheritDoc}
     */
    protected Object readSimpleValue(SimpleTypeMapping typeMapping) {
        CsvSimpleTypeMapping csvSimpleTypeMapping = (CsvSimpleTypeMapping) typeMapping;
        String stringValue = this.lowLevelDeserializer.nextField(csvSimpleTypeMapping.getQuoteMode());
        if (stringValue == null) {
            // the field does not exist (an empty field would yield an empty string)
            return null;
        }
        if (stringValue.equals(csvSimpleTypeMapping.getNoValueString())) {
            return null;
        } else {
            return typeMapping.getSimpleTypeConverter().fromString(stringValue);
        }
    }

    /**
     * {@inheritDoc}
     */
    protected String readPrefix() {
        // will never return null as this method is called for non empty lines only
        return lowLevelDeserializer.nextField(QuoteMode.NEVER);
    }

    /**
     * {@inheritDoc}
     */
    protected CsvLowLevelDeserializer getLowLevelDeserializer() {
        return this.lowLevelDeserializer;
    }

}