org.apache.wookie.w3c.util.NumberUtils.java Source code

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Here is the source code for org.apache.wookie.w3c.util.NumberUtils.java

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/*
 *  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.apache.wookie.w3c.util;

import org.apache.commons.lang.StringUtils;

/**
 * Utility for handling numbers according to W3C processing rules
 * @author scott
 *
 */
public class NumberUtils {

    public static int processNonNegativeInteger(String in) throws NumberFormatException {
        int result = 0;
        in = UnicodeUtils.normalizeSpaces(in);
        StringUtils.stripStart(in, "");

        if (in.length() == 0)
            throw new NumberFormatException("no non-space characters");

        for (int pos = 0; pos < in.length(); pos++) {
            String nextchar = in.substring(pos, pos + 1);
            // If the nextchar is not one of U+0030 (0) .. U+0039 (9), then return result.
            try {
                int i = Integer.parseInt(nextchar);
                result = result * 10 + i;
            } catch (Exception e) {
                return result;
            }
        }

        return result;

    }

}