ConfAttributeIterator.java

/*
 * Copyright 2013 NGDATA nv
 * Copyright 2008 Outerthought bvba and Schaubroeck nv
 *
 * 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.lilyproject.runtime.conf.jxpath;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import org.apache.commons.jxpath.ri.QName;
import org.apache.commons.jxpath.ri.model.NodeIterator;
import org.apache.commons.jxpath.ri.model.NodePointer;
import org.lilyproject.runtime.conf.Conf;

public class ConfAttributeIterator implements NodeIterator {
    private NodePointer parent;
    private List<Map.Entry<String, String>> attributes = new ArrayList<Map.Entry<String, String>>();
    private int position = 0;

    /**
     * @param parent pointer
     * @param qName to test
     */
    public ConfAttributeIterator(NodePointer parent, QName qName) {
        this.parent = parent;

        Conf conf = (Conf)parent.getNode();

        String name = qName.getName();
        if (name.equals("*")) {
            attributes.addAll(conf.getAttributes().entrySet());
        } else {
            for (Map.Entry<String, String> entry : conf.getAttributes().entrySet()) {
                if (entry.getKey().equals(name)) {
                    attributes.add(entry);
                    break;
                }
            }
        }
    }

    public NodePointer getNodePointer() {
        if (position == 0) {
            if (!setPosition(1)) {
                return null;
            }
            position = 0;
        }
        int index = position - 1;
        if (index < 0) {
            index = 0;
        }

        Map.Entry<String, String> entry = attributes.get(index);
        return new ConfAttributePointer(parent,  new ConfAttr(entry.getKey(), entry.getValue()));
    }

    public int getPosition() {
        return position;
    }

    public boolean setPosition(int position) {
        this.position = position;
        return position >= 1 && position <= attributes.size();
    }

}