com.google.gwt.text.client.LongParser.java Source code

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Here is the source code for com.google.gwt.text.client.LongParser.java

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/*
 * Copyright 2010 Google Inc.
 *
 * 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.gwt.text.client;

import com.google.gwt.i18n.client.NumberFormat;
import com.google.gwt.text.shared.Parser;

import java.text.ParseException;

/**
 * A localized parser based on {@link NumberFormat#getDecimalFormat}.
 */
public class LongParser implements Parser<Long> {

    private static LongParser INSTANCE;

    /**
     * Returns the instance of the no-op renderer.
     */
    public static Parser<Long> instance() {
        if (INSTANCE == null) {
            INSTANCE = new LongParser();
        }
        return INSTANCE;
    }

    protected LongParser() {
    }

    public Long parse(CharSequence object) throws ParseException {
        if ("".equals(object.toString())) {
            return null;
        }

        try {
            return (long) NumberFormat.getDecimalFormat().parse(object.toString());
        } catch (NumberFormatException e) {
            throw new ParseException(e.getMessage(), 0);
        }
    }
}