/*
 * Copyright (C) 2011 The Guava Authors
 *
 * 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 com.google.common.primitives;

import com.google.common.annotations.GwtCompatible;

/**
 * A string to be parsed as a number and the radix to interpret it in.
 */
@GwtCompatible
final class ParseRequest {
	final String rawValue;
	final int radix;

	private ParseRequest(String rawValue, int radix) {
		this.rawValue = rawValue;
		this.radix = radix;
	}

	static ParseRequest fromString(String stringValue) {
		if (stringValue.length() == 0) {
			throw new NumberFormatException("empty string");
		}

		// Handle radix specifier if present
		String rawValue;
		int radix;
		char firstChar = stringValue.charAt(0);
		if (stringValue.startsWith("0x") || stringValue.startsWith("0X")) {
			rawValue = stringValue.substring(2);
			radix = 16;
		} else if (firstChar == '#') {
			rawValue = stringValue.substring(1);
			radix = 16;
		} else if (firstChar == '0' && stringValue.length() > 1) {
			rawValue = stringValue.substring(1);
			radix = 8;
		} else {
			rawValue = stringValue;
			radix = 10;
		}

		return new ParseRequest(rawValue, radix);
	}
}
