Path.java

/*
 * (C) Copyright 2006-2011 Nuxeo SA (http://nuxeo.com/) and others.
 *
 * 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.
 * 
 * Contributors:
 *     Nuxeo - initial API and implementation
 *
 * $Id$
 */

package org.nuxeo.common.xmap;

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

/**
 * @author <a href="mailto:bs@nuxeo.com">Bogdan Stefanescu</a>
 */
public class Path {

    public static final String[] EMPTY_SEGMENTS = new String[0];

    final String path;

    String[] segments;

    String attribute;

    public Path(String path) {
        this.path = path;
        parse(path);
    }

    @Override
    public String toString() {
        return path;
    }

    @Override
    public boolean equals(Object obj) {
        if (obj == this) {
            return true;
        }
        if (obj instanceof Path) {
            return ((Path) obj).path.equals(path);
        }
        return false;
    }

    @Override
    public int hashCode() {
        return path.hashCode();
    }

    private void parse(String path) {
        List<String> seg = new ArrayList<String>();
        StringBuilder buf = new StringBuilder();
        char[] chars = path.toCharArray();
        boolean attr = false;
        for (char c : chars) {
            switch (c) {
            case '/':
                seg.add(buf.toString());
                buf.setLength(0);
                break;
            case '@':
                attr = true;
                seg.add(buf.toString());
                buf.setLength(0);
                break;
            default:
                buf.append(c);
                break;
            }
        }
        if (buf.length() > 0) {
            if (attr) {
                attribute = buf.toString();
            } else {
                seg.add(buf.toString());
            }
        }
        int size = seg.size();
        if (size == 1 && seg.get(0).length() == 0) {
            segments = EMPTY_SEGMENTS;
        } else {
            segments = seg.toArray(new String[size]);
        }
    }

}