com.github.jknack.css.expression.NumberExpression.java Source code

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Here is the source code for com.github.jknack.css.expression.NumberExpression.java

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/**
 * Copyright (c) 2012-2013 Edgar Espina
 *
 * This file is part of css.java.
 *
 * 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.github.jknack.css.expression;

import static org.apache.commons.lang3.Validate.notNull;

public class NumberExpression extends AbstractExpression {

    public enum Unit {
        NONE(""), PERCENTAGE("%"), EM("em"), EX("ex"), CH("ch"), REM("rem"), VW("vw"), VH("vh"), V_MIN(
                "vmin"), V_MAX("vmax"), CM("cm"), MM("mm"), IN("in"), PX("px"), PT("pt"), PC("pc"), DEG("deg"), RAD(
                        "rad"), GRAD("grad"), TURN("turn"), SECONDS(
                                "s"), MILLIS("ms"), DPI("dpi"), DPCM("dpcm"), DPPX("dppx"), HZ("hz"), KHZ("khz");

        private String unit;

        private Unit(final String unit) {
            this.unit = notNull(unit, "The unit is required.");
        }

        public String unit() {
            return unit;
        }

        public static Unit of(final String sunit) {
            for (Unit unit : values()) {
                if (unit.unit.equalsIgnoreCase(sunit)) {
                    return unit;
                }
            }
            return NONE;
        }

        @Override
        public String toString() {
            return unit;
        }
    }

    private Unit unit;

    private Number number;

    public NumberExpression(final String value) {
        String[] parts = split(value);
        try {
            number = Integer.parseInt(parts[0]);
        } catch (NumberFormatException ex) {
            number = Double.parseDouble(parts[0]);
        }
        this.unit = Unit.of(parts[1]);
    }

    private static String[] split(final String value) {
        for (int i = 0; i < value.length(); i++) {
            char ch = value.charAt(i);
            if (!Character.isDigit(ch) && ch != '.') {
                return new String[] { value.substring(0, i), value.substring(i) };
            }
        }
        return new String[] { value, null };
    }

    public Number number() {
        return number;
    }

    public Unit unit() {
        return unit;
    }

    @Override
    public String toString() {
        StringBuilder buffer = new StringBuilder();
        buffer.append(number);
        buffer.append(unit);
        return buffer.toString();
    }
}