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/*
 * Copyright 2017 Michal Nikodim
 *
 * 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.cuberact.json.builder.number;

/**
 * Number converter to Long and Double
 *
 * @author Michal Nikodim ([email protected])
 */
public class NumberConverterLongDouble implements NumberConverter {

    public static final NumberConverterLongDouble REF = new NumberConverterLongDouble();

    private final long[] char2long = new long[58];

    private NumberConverterLongDouble() {
        //use NumberConverterLongDouble.REF
        char2long['0'] = 0;
        char2long['1'] = 1;
        char2long['2'] = 2;
        char2long['3'] = 3;
        char2long['4'] = 4;
        char2long['5'] = 5;
        char2long['6'] = 6;
        char2long['7'] = 7;
        char2long['8'] = 8;
        char2long['9'] = 9;
    }

    /**
     * @return number as Long
     * {@link NumberConverter#convertWholeNumber(char[], int, int)}
     */
    @Override
    public Number convertWholeNumber(char[] number, int offset, int count) throws Throwable {
        long result = 0;
        long sign = 1;
        char c = number[offset];
        if (c == '-') {
            sign = -1;
        } else {
            result = char2long[c];
        }
        for (int i = offset + 1; i < count; i++) {
            result = result * 10 + char2long[number[i]];
        }
        return sign * result;
    }

    /**
     * @return number as Double
     * {@link NumberConverter#convertFloatingPointNumber(char[], int, int)}
     */
    @Override
    public Number convertFloatingPointNumber(char[] number, int offset, int count) throws Throwable {
        return Double.parseDouble(new String(number, offset, count));
    }
}




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