/*
 * 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 com.alipay.sofa.common.xmap;

import java.io.IOException;
import java.util.List;

import org.w3c.dom.Document;
import org.w3c.dom.DocumentFragment;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.ranges.DocumentRange;
import org.w3c.dom.ranges.Range;

import com.alipay.sofa.common.xmap.annotation.XContent;
import org.apache.xml.serialize.OutputFormat;

/**
 * @author <a href="mailto:bs@nuxeo.com">Bogdan Stefanescu</a>
 * @author xi.hux@alipay.com
 * @since 2.6.0
 */
public class XAnnotatedContent extends XAnnotatedMember {

    private static final OutputFormat DEFAULT_FORMAT = new OutputFormat();

    static {
        DEFAULT_FORMAT.setOmitXMLDeclaration(true);
        DEFAULT_FORMAT.setIndenting(true);
        DEFAULT_FORMAT.setMethod("xml");
        DEFAULT_FORMAT.setEncoding("UTF-8");
    }

    public XAnnotatedContent(XMap xmap, XSetter setter, XGetter getter, XContent anno) {
        super(xmap, setter, getter);
        this.path = new Path(anno.value());
        this.type = setter.getType();
        this.valueFactory = xmap.getValueFactory(this.type);
        this.xao = xmap.register(this.type);
    }

    @Override
    protected Object getValue(Context ctx, Element base) throws IOException {
        Element el = (Element) DOMHelper.getElementNode(base, path);
        if (el == null) {
            return null;
        }
        el.normalize();
        Node node = el.getFirstChild();
        if (node == null) {
            return "";
        }
        Range range = ((DocumentRange) el.getOwnerDocument()).createRange();
        range.setStartBefore(node);
        range.setEndAfter(el.getLastChild());
        DocumentFragment fragment = range.cloneContents();
        boolean asDOM = setter.getType() == DocumentFragment.class;
        return asDOM ? fragment : DOMSerializer.toString(fragment, DEFAULT_FORMAT);
    }

    @Override
    public void decode(Object instance, Node base, Document document, List<String> filters)
                                                                                           throws Exception {
        // do nothing
    }

}
