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Groovy: A powerful multi-faceted language for the JVM
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/*
 *  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.
 */
package groovy.xml

/**
 * A Groovy builder that works with Stax processors.
 * A typical usage is as follows:
 *  * import javax.xml.stream.XMLOutputFactory
 * def factory = XMLOutputFactory.newInstance()
 * def writer = new StringWriter()
 * def builder = new groovy.xml.StaxBuilder(factory.createXMLStreamWriter(writer))
 * builder.root1(a:5, b:7) {
 *     elem1('hello1')
 *     elem2('hello2')
 *     elem3(x:7)
 * }
 * assert writer.toString() == 'hello1hello2'
 * 
 * Or an external library such as Jettison can be used as follows:
 *  * @Grab('org.codehaus.jettison:jettison:1.2')
 * import org.codehaus.jettison.mapped.*
 * import javax.xml.stream.XMLStreamException
 *
 * def conv = new MappedNamespaceConvention()
 * def writer = new StringWriter()
 * def mappedWriter = new MappedXMLStreamWriter(conv, writer)
 * def builder = new groovy.xml.StaxBuilder(mappedWriter)
 * builder.root1(a:5, b:7) {
 *     elem1('hello1')
 *     elem2('hello2')
 *     elem3(x:7)
 * }
 * assert writer.toString() == '''{"root1":{"@a":"5","@b":"7","elem1":"hello1","elem2":"hello2","elem3":{"@x":"7"}}}'''
 * 
 */
class StaxBuilder extends BuilderSupport {

    def writer

    StaxBuilder(xmlStreamWriter) {
        writer = xmlStreamWriter
        writer.writeStartDocument()
    }

    protected createNode(name) {
        createNode(name, null, null)
    }

    protected createNode(name, value) {
        createNode(name, null, value)
    }

    protected createNode(name, Map attributes) {
        createNode(name, attributes, null)
    }

    protected createNode(name, Map attributes, value) {
        writer.writeStartElement(name.toString())
        if (attributes) {
            attributes.each { k, v ->
                writer.writeAttribute(k.toString(), v.toString())
            }
        }
        if (value) {
            writer.writeCharacters(value.toString())
        }
        name
    }

    @SuppressWarnings('UnusedMethodParameter')
    protected void nodeCompleted(parent, node) {
        writer.writeEndElement()
        if (!parent) {
            writer.writeEndDocument()
            writer.flush()
        }
    }

    @SuppressWarnings(['UnusedMethodParameter', 'EmptyMethod'])
    protected void setParent(parent, child) {
    }

}