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Modello XML Plugin contains shared code for every plugins working on XML representation of the model.
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package org.codehaus.modello.plugins.xml;

/*
 * Copyright (c) 2004, Codehaus.org
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the "Software"), to deal in
 * the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
 * of the Software, and to permit persons to whom the Software is furnished to do
 * so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

import java.util.List;

import org.codehaus.modello.model.ModelClass;
import org.codehaus.modello.model.ModelField;
import org.codehaus.modello.model.Version;
import org.codehaus.modello.plugin.AbstractModelloGenerator;
import org.codehaus.modello.plugins.xml.metadata.XmlAssociationMetadata;
import org.codehaus.modello.plugins.xml.metadata.XmlFieldMetadata;
import org.codehaus.plexus.util.xml.XMLWriter;
import org.codehaus.plexus.util.xml.XmlWriterUtil;

/**
 * Abstract class for plugins working on XML representation of the model, without having any need to generate
 * Java code.
 *
 * @author Hervé Boutemy
 */
public abstract class AbstractXmlGenerator extends AbstractModelloGenerator {
    protected void initHeader(XMLWriter w) {
        List header = getHeader();
        for (String headerLine : header) {
            XmlWriterUtil.writeComment(w, headerLine);
        }
    }

    /**
     * Resolve XML tag name for a class. Note: only root class needs such a resolution.
     *
     * @param modelClass the model class
     * @return the XML tag name for the class
     */
    protected String resolveTagName(ModelClass modelClass) {
        return XmlModelHelpers.resolveTagName(modelClass);
    }

    /**
     * Resolve XML tag name for a field.
     *
     * @param modelField the model field
     * @param xmlFieldMetadata the XML metadata of the field
     * @return the XML tag name for the field
     */
    protected String resolveTagName(ModelField modelField, XmlFieldMetadata xmlFieldMetadata) {
        return XmlModelHelpers.resolveTagName(modelField, xmlFieldMetadata);
    }

    /**
     * Resolve XML tag name for an item in an association with many multiplicity.
     *
     * @param fieldTagName the XML tag name of the field containing the association
     * @param xmlAssociationMetadata the XML metadata of the association
     * @return the XML tag name for items
     */
    protected String resolveTagName(String fieldTagName, XmlAssociationMetadata xmlAssociationMetadata) {
        return XmlModelHelpers.resolveTagName(fieldTagName, xmlAssociationMetadata);
    }

    protected boolean hasContentField(List modelFields) {
        return (getContentField(modelFields) != null);
    }

    /**
     * Get the field which type is Content if any.
     *
     * @param modelFields the fields to check
     * @return the field, or null if no field is Content
     */
    protected ModelField getContentField(List modelFields) {
        return XmlModelHelpers.getContentField(modelFields);
    }

    /**
     * Gets all fields that are not marked as XML attribute.
     *
     * @param modelFields The collection of model fields from which to extract the XML attributes, must not be
     *            null.
     * @return The list of XML attributes fields, can be empty but never null.
     */
    protected List getXmlAttributeFields(List modelFields) {
        return XmlModelHelpers.getXmlAttributeFields(modelFields);
    }

    /**
     * Return the XML fields of this class, with proper XML order and no XML transient fields.
     *
     * @param modelClass current class
     * @param version the version of the class to use
     * @return the list of XML fields of this class
     */
    protected List getFieldsForXml(ModelClass modelClass, Version version) {
        return XmlModelHelpers.getFieldsForXml(modelClass, version);
    }
}