com.microsoft.azure.documentdb.PathParser Maven / Gradle / Ivy

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package com.microsoft.azure.documentdb;

import java.util.ArrayList;
import java.util.Collection;

final class PathParser {

	private static final char segmentSeparator = '/';
	private static final String errorMessageFormat = "Invalid path, failed at index {0}.";

	public static Collection getPathParts(String path) {
		ArrayList tokens = new ArrayList();
		int currentIndex = 0;

		while (currentIndex < path.length()) {
			if (path.charAt(currentIndex) != segmentSeparator) {
				throw new IllegalArgumentException(String.format(errorMessageFormat, currentIndex));
			}

			if (++currentIndex == path.length())
				break;

			if (path.charAt(currentIndex) == '\"' || path.charAt(currentIndex) == '\'') {
				char quote = path.charAt(currentIndex);
				int newIndex = ++currentIndex;
				while (true) {
					newIndex = path.indexOf(quote, newIndex);
					if (newIndex == -1) {
						throw new IllegalArgumentException(String.format(errorMessageFormat, currentIndex));
					}

					if (path.charAt(newIndex - 1) != '\\') {
						break;
					}

					++newIndex;
				}

				String token = path.substring(currentIndex, newIndex);
				tokens.add(token);
				currentIndex = newIndex + 1;
			} else {
				int newIndex = path.indexOf(segmentSeparator, currentIndex);
				String token = null;
				if (newIndex == -1) {
					token = path.substring(currentIndex);
					currentIndex = path.length();
				} else {
					token = path.substring(currentIndex, newIndex);
					currentIndex = newIndex;
				}

				token = token.trim();
				tokens.add(token);
			}
		}

		return tokens;
	}
}