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Java example source code file (Vector2DFormat.java)

This example Java source code file (Vector2DFormat.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

default_separator, default_suffix, fieldposition, locale, mathparseexception, numberformat, override, parseposition, string, stringbuffer, text, util, vector2d, vector2dformat, vectorformat

The Vector2DFormat.java Java example source code

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.commons.math3.geometry.euclidean.twod;

import java.text.FieldPosition;
import java.text.NumberFormat;
import java.text.ParsePosition;
import java.util.Locale;

import org.apache.commons.math3.exception.MathParseException;
import org.apache.commons.math3.geometry.Vector;
import org.apache.commons.math3.geometry.VectorFormat;
import org.apache.commons.math3.util.CompositeFormat;

/**
 * Formats a 2D vector in components list format "{x; y}".
 * <p>The prefix and suffix "{" and "}" and the separator "; " can be replaced by
 * any user-defined strings. The number format for components can be configured.</p>
 * <p>White space is ignored at parse time, even if it is in the prefix, suffix
 * or separator specifications. So even if the default separator does include a space
 * character that is used at format time, both input string "{1;1}" and
 * " { 1 ; 1 } " will be parsed without error and the same vector will be
 * returned. In the second case, however, the parse position after parsing will be
 * just after the closing curly brace, i.e. just before the trailing space.</p>
 * <p>Note: using "," as a separator may interfere with the grouping separator
 * of the default {@link NumberFormat} for the current locale. Thus it is advised
 * to use a {@link NumberFormat} instance with disabled grouping in such a case.</p>
 *
 * @since 3.0
 */
public class Vector2DFormat extends VectorFormat<Euclidean2D> {

    /**
     * Create an instance with default settings.
     * <p>The instance uses the default prefix, suffix and separator:
     * "{", "}", and "; " and the default number format for components.</p>
     */
    public Vector2DFormat() {
        super(DEFAULT_PREFIX, DEFAULT_SUFFIX, DEFAULT_SEPARATOR,
              CompositeFormat.getDefaultNumberFormat());
    }

    /**
     * Create an instance with a custom number format for components.
     * @param format the custom format for components.
     */
    public Vector2DFormat(final NumberFormat format) {
        super(DEFAULT_PREFIX, DEFAULT_SUFFIX, DEFAULT_SEPARATOR, format);
    }

    /**
     * Create an instance with custom prefix, suffix and separator.
     * @param prefix prefix to use instead of the default "{"
     * @param suffix suffix to use instead of the default "}"
     * @param separator separator to use instead of the default "; "
     */
    public Vector2DFormat(final String prefix, final String suffix,
                         final String separator) {
        super(prefix, suffix, separator, CompositeFormat.getDefaultNumberFormat());
    }

    /**
     * Create an instance with custom prefix, suffix, separator and format
     * for components.
     * @param prefix prefix to use instead of the default "{"
     * @param suffix suffix to use instead of the default "}"
     * @param separator separator to use instead of the default "; "
     * @param format the custom format for components.
     */
    public Vector2DFormat(final String prefix, final String suffix,
                         final String separator, final NumberFormat format) {
        super(prefix, suffix, separator, format);
    }

    /**
     * Returns the default 2D vector format for the current locale.
     * @return the default 2D vector format.
     */
    public static Vector2DFormat getInstance() {
        return getInstance(Locale.getDefault());
    }

    /**
     * Returns the default 2D vector format for the given locale.
     * @param locale the specific locale used by the format.
     * @return the 2D vector format specific to the given locale.
     */
    public static Vector2DFormat getInstance(final Locale locale) {
        return new Vector2DFormat(CompositeFormat.getDefaultNumberFormat(locale));
    }

    /** {@inheritDoc} */
    @Override
    public StringBuffer format(final Vector<Euclidean2D> vector, final StringBuffer toAppendTo,
                               final FieldPosition pos) {
        final Vector2D p2 = (Vector2D) vector;
        return format(toAppendTo, pos, p2.getX(), p2.getY());
    }

    /** {@inheritDoc} */
    @Override
    public Vector2D parse(final String source) throws MathParseException {
        ParsePosition parsePosition = new ParsePosition(0);
        Vector2D result = parse(source, parsePosition);
        if (parsePosition.getIndex() == 0) {
            throw new MathParseException(source,
                                         parsePosition.getErrorIndex(),
                                         Vector2D.class);
        }
        return result;
    }

    /** {@inheritDoc} */
    @Override
    public Vector2D parse(final String source, final ParsePosition pos) {
        final double[] coordinates = parseCoordinates(2, source, pos);
        if (coordinates == null) {
            return null;
        }
        return new Vector2D(coordinates[0], coordinates[1]);
    }

}

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