org.broadleafcommerce.common.extensibility.context.merge.handlers.AttributePreserveInsert.java Source code

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Here is the source code for org.broadleafcommerce.common.extensibility.context.merge.handlers.AttributePreserveInsert.java

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/*
 * #%L
 * BroadleafCommerce Common Libraries
 * %%
 * Copyright (C) 2009 - 2013 Broadleaf Commerce
 * %%
 * 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.
 * #L%
 */
package org.broadleafcommerce.common.extensibility.context.merge.handlers;

import org.apache.commons.collections.CollectionUtils;
import org.w3c.dom.Attr;
import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;

import java.util.Arrays;
import java.util.Comparator;
import java.util.List;

/**
 * Merge the attributes of a source and patch node, only adding attributes from
 * the patch side. When the same attribute is encountered in the source and
 * patch children list, the source attribute is left untouched.
 * @author jfischer
 */
public class AttributePreserveInsert extends BaseHandler {

    @Override
    public Node[] merge(List<Node> nodeList1, List<Node> nodeList2, List<Node> exhaustedNodes) {
        if (CollectionUtils.isEmpty(nodeList1) || CollectionUtils.isEmpty(nodeList2)) {
            return null;
        }
        Node node1 = nodeList1.get(0);
        Node node2 = nodeList2.get(0);
        NamedNodeMap attributes2 = node2.getAttributes();

        Comparator<Object> nameCompare = new Comparator<Object>() {
            @Override
            public int compare(Object arg0, Object arg1) {
                return ((Node) arg0).getNodeName().compareTo(((Node) arg1).getNodeName());
            }
        };
        Node[] tempNodes = {};
        tempNodes = exhaustedNodes.toArray(tempNodes);
        Arrays.sort(tempNodes, nameCompare);
        int length = attributes2.getLength();
        for (int j = 0; j < length; j++) {
            Node temp = attributes2.item(j);
            int pos = Arrays.binarySearch(tempNodes, temp, nameCompare);
            if (pos < 0) {
                Attr clone = (Attr) temp.cloneNode(true);
                ((Element) node1).setAttributeNode((Attr) node1.getOwnerDocument().importNode(clone, true));
            }
        }

        return null;
    }

}