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Groovy example source code file (StaxBuilder.groovy)

This example Groovy source code file (StaxBuilder.groovy) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Groovy tags/keywords

buildersupport, buildersupport, map, map, staxbuilder, staxbuilder

The Groovy StaxBuilder.groovy source code

/*
 * Copyright 2003-2010 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 groovy.xml

/**
 * A Groovy builder that works with Stax processors.
 * Using Java 6, typical usage is as follows:
 * <pre>
 * def factory = XMLOutputFactory.newInstance()
 * def writer = new StringWriter()
 * def builder = new StaxBuilder(factory.createXMLStreamWriter(writer))
 * builder.root1(a:5, b:7) {
 *     elem1('hello1')
 *     elem2('hello2')
 *     elem3(x:7)
 * }
 * assert writer == """<root1 a="5" b="7">hello1hello2"""
 * </pre>
 * Or an external library such as Jettison can be used as follows:
 * <pre>
 * @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"}}}'''
 * </pre>
 *
 * @author <a href="dejan@nighttale.net">Dejan Bosanac
 * @author Paul King
 */
public class StaxBuilder extends BuilderSupport {

    def writer

    public 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
    }

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

    protected void setParent(parent, child) {
    }

}

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