org.apache.ddlutils.io.DataWriter.java Source code

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Here is the source code for org.apache.ddlutils.io.DataWriter.java

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package org.apache.ddlutils.io;

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.
 */

import java.io.OutputStream;
import java.io.Writer;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import org.apache.commons.beanutils.DynaBean;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.ddlutils.dynabean.SqlDynaBean;
import org.apache.ddlutils.dynabean.SqlDynaClass;
import org.apache.ddlutils.io.converters.SqlTypeConverter;
import org.apache.ddlutils.model.Column;
import org.apache.ddlutils.model.Table;

/**
 * Writes dyna beans matching a specified database model into an XML file.
 */
public class DataWriter extends PrettyPrintingXmlWriter {
    /** Our log. */
    private final Log _log = LogFactory.getLog(DataWriter.class);

    /** The converters. */
    private ConverterConfiguration _converterConf = new ConverterConfiguration();

    /**
     * Creates a data writer instance using UTF-8 encoding.
     * 
     * @param output The target to write the data XML to
     */
    public DataWriter(OutputStream output) throws DataWriterException {
        this(output, "UTF-8");
    }

    /**
     * Creates a data writer instance.
     * 
     * @param output   The target to write the data XML to
     * @param encoding The encoding of the XML file
     */
    public DataWriter(OutputStream output, String encoding) throws DataWriterException {
        super(output, encoding);
    }

    /**
     * Creates a data writer instance using the specified writer. Note that the writer
     * needs to be configured using the specified encoding.
     * 
     * @param output   The target to write the data XML to
     * @param encoding The encoding of the writer
     */
    public DataWriter(Writer output, String encoding) throws DataWriterException {
        super(output, encoding);
    }

    /**
     * {@inheritDoc}
     */
    protected void throwException(Exception baseEx) throws DdlUtilsXMLException {
        throw new DataWriterException(baseEx);
    }

    /**
     * Returns the converter configuration of this data reader.
     * 
     * @return The converter configuration
     */
    public ConverterConfiguration getConverterConfiguration() {
        return _converterConf;
    }

    /**
     * Writes the start of the XML document, including the start of the outermost
     * XML element (<code>data</code>).
     */
    public void writeDocumentStart() throws DdlUtilsXMLException {
        super.writeDocumentStart();
        writeElementStart(null, "data");
        printlnIfPrettyPrinting();
    }

    /**
     * Writes the end of the XML document, including the end of the outermost
     * XML element (<code>data</code>).
     */
    public void writeDocumentEnd() throws DdlUtilsXMLException {
        writeElementEnd();
        printlnIfPrettyPrinting();
        super.writeDocumentEnd();
    }

    /**
     * Writes the given bean.
     * 
     * @param bean The bean to write
     */
    public void write(SqlDynaBean bean) throws DataWriterException {
        SqlDynaClass dynaClass = (SqlDynaClass) bean.getDynaClass();
        Table table = dynaClass.getTable();
        TableXmlWriter tableWriter = new TableXmlWriter(table);
        List columnWriters = new ArrayList();

        for (int idx = 0; idx < table.getColumnCount(); idx++) {
            Column column = table.getColumn(idx);
            Object value = bean.get(column.getName());
            SqlTypeConverter converter = _converterConf.getRegisteredConverter(table, column);
            String valueAsText = null;

            if (converter == null) {
                if (value != null) {
                    valueAsText = value.toString();
                }
            } else {
                valueAsText = converter.convertToString(value, column.getTypeCode());
            }
            if (valueAsText != null) {
                columnWriters.add(new ColumnXmlWriter(column, valueAsText));
            }
        }

        tableWriter.write(columnWriters, this);
    }

    /**
     * Writes the beans contained in the given iterator.
     * 
     * @param beans The beans iterator
     */
    public void write(Iterator beans) throws DataWriterException {
        while (beans.hasNext()) {
            DynaBean bean = (DynaBean) beans.next();

            if (bean instanceof SqlDynaBean) {
                write((SqlDynaBean) bean);
            } else {
                _log.warn("Cannot write normal dyna beans (type: " + bean.getDynaClass().getName() + ")");
            }
        }
    }

    /**
     * Writes the beans contained in the given collection.
     * 
     * @param beans The beans
     */
    public void write(Collection beans) throws DataWriterException {
        write(beans.iterator());
    }
}