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/*
 * Licensed to Elastic Search and Shay Banon under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. Elastic Search 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 org.elasticsearch.index.mapper.xcontent;

import org.elasticsearch.common.util.concurrent.NotThreadSafe;

/**
 * @author kimchy (Shay Banon)
 */
@NotThreadSafe
public class ContentPath {

    public static enum Type {
        JUST_NAME,
        FULL,
    }

    private Type pathType;

    private final char delimiter;

    private final StringBuilder sb;

    private final int offset;

    private int index = 0;

    private String[] path = new String[10];

    public ContentPath() {
        this(0);
    }

    /**
     * Constructs a json path with an offset. The offset will result an offset
     * number of path elements to not be included in {@link #pathAsText(String)}.
     */
    public ContentPath(int offset) {
        this.delimiter = '.';
        this.sb = new StringBuilder();
        this.offset = offset;
        reset();
    }

    public void reset() {
        this.index = 0;
    }

    public void add(String name) {
        path[index++] = name;
        if (index == path.length) { // expand if needed
            String[] newPath = new String[path.length + 10];
            System.arraycopy(path, 0, newPath, 0, path.length);
            path = newPath;
        }
    }

    public void remove() {
        path[index--] = null;
    }

    public String pathAsText(String name) {
        if (pathType == Type.JUST_NAME) {
            return name;
        }
        return fullPathAsText(name);
    }

    public String fullPathAsText(String name) {
        sb.setLength(0);
        for (int i = offset; i < index; i++) {
            sb.append(path[i]).append(delimiter);
        }
        sb.append(name);
        return sb.toString();
    }

    public Type pathType() {
        return pathType;
    }

    public void pathType(Type type) {
        this.pathType = type;
    }
}