/*
 * Copyright 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 org.gradle.build.docs

import javax.xml.parsers.DocumentBuilder
import javax.xml.parsers.DocumentBuilderFactory
import javax.xml.transform.OutputKeys
import javax.xml.transform.Transformer
import javax.xml.transform.TransformerFactory
import javax.xml.transform.dom.DOMSource
import javax.xml.transform.stream.StreamResult
import org.w3c.dom.Document
import org.w3c.dom.Element
import org.w3c.dom.Node

class XIncludeAwareXmlProvider {
    Document root

    Element parse(File sourceFile) {
        root = parseSourceFile(sourceFile)
        return root.documentElement
    }

    Node emptyDoc() {
        root = DocumentBuilderFactory.newInstance().newDocumentBuilder().newDocument()
    }

    void write(File destFile, boolean indent = false) {
        destFile.withOutputStream {OutputStream stream ->
            TransformerFactory factory = TransformerFactory.newInstance();
            Transformer transformer = factory.newTransformer();
            if (indent) {
                transformer.setOutputProperty(OutputKeys.INDENT, "yes")
            }
            transformer.setOutputProperty(OutputKeys.METHOD, "xml");
            transformer.setOutputProperty(OutputKeys.MEDIA_TYPE, "text/xml");
            transformer.transform(new DOMSource(root), new StreamResult(stream));
        }
    }

    Document getDocument() {
        return root
    }
    
    private Document parseSourceFile(File sourceFile) {
        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance()
        factory.setNamespaceAware(true)
        factory.setXIncludeAware(true)
        DocumentBuilder builder = factory.newDocumentBuilder()
        return builder.parse(sourceFile)
    }

}
