/*
* 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.math.geometry;
import java.text.FieldPosition;
import java.text.NumberFormat;
import java.text.ParseException;
import java.text.ParsePosition;
import java.util.Locale;
import org.apache.commons.math.MathRuntimeException;
import org.apache.commons.math.exception.util.LocalizedFormats;
import org.apache.commons.math.util.CompositeFormat;
/**
* Formats a 3D vector in components list format "{x; y; z}".
* <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;1}" and
* " { 1 ; 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>
*
* @version $Revision: 1003886 $ $Date: 2010-10-02 23:04:44 +0200 (sam. 02 oct. 2010) $
*/
public class Vector3DFormat extends CompositeFormat {
/** Serializable version identifier */
private static final long serialVersionUID = -5447606608652576301L;
/** The default prefix: "{". */
private static final String DEFAULT_PREFIX = "{";
/** The default suffix: "}". */
private static final String DEFAULT_SUFFIX = "}";
/** The default separator: ", ". */
private static final String DEFAULT_SEPARATOR = "; ";
/** Prefix. */
private final String prefix;
/** Suffix. */
private final String suffix;
/** Separator. */
private final String separator;
/** Trimmed prefix. */
private final String trimmedPrefix;
/** Trimmed suffix. */
private final String trimmedSuffix;
/** Trimmed separator. */
private final String trimmedSeparator;
/** The format used for components. */
private final NumberFormat format;
/**
* 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 Vector3DFormat() {
this(DEFAULT_PREFIX, DEFAULT_SUFFIX, DEFAULT_SEPARATOR, getDefaultNumberFormat());
}
/**
* Create an instance with a custom number format for components.
* @param format the custom format for components.
*/
public Vector3DFormat(final NumberFormat format) {
this(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 Vector3DFormat(final String prefix, final String suffix,
final String separator) {
this(prefix, suffix, separator, 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 Vector3DFormat(final String prefix, final String suffix,
final String separator, final NumberFormat format) {
this.prefix = prefix;
this.suffix = suffix;
this.separator = separator;
trimmedPrefix = prefix.trim();
trimmedSuffix = suffix.trim();
trimmedSeparator = separator.trim();
this.format = format;
}
/**
* Get the set of locales for which 3D vectors formats are available.
* <p>This is the same set as the {@link NumberFormat} set.</p>
* @return available 3D vector format locales.
*/
public static Locale[] getAvailableLocales() {
return NumberFormat.getAvailableLocales();
}
/**
* Get the format prefix.
* @return format prefix.
*/
public String getPrefix() {
return prefix;
}
/**
* Get the format suffix.
* @return format suffix.
*/
public String getSuffix() {
return suffix;
}
/**
* Get the format separator between components.
* @return format separator.
*/
public String getSeparator() {
return separator;
}
/**
* Get the components format.
* @return components format.
*/
public NumberFormat getFormat() {
return format;
}
/**
* Returns the default 3D vector format for the current locale.
* @return the default 3D vector format.
*/
public static Vector3DFormat getInstance() {
return getInstance(Locale.getDefault());
}
/**
* Returns the default 3D vector format for the given locale.
* @param locale the specific locale used by the format.
* @return the 3D vector format specific to the given locale.
*/
public static Vector3DFormat getInstance(final Locale locale) {
return new Vector3DFormat(getDefaultNumberFormat(locale));
}
/**
* This static method calls {@link #format(Object)} on a default instance of
* Vector3DFormat.
*
* @param v Vector3D object to format
* @return A formatted vector
*/
public static String formatVector3D(Vector3D v) {
return getInstance().format(v);
}
/**
* Formats a {@link Vector3D} object to produce a string.
* @param vector the object to format.
* @param toAppendTo where the text is to be appended
* @param pos On input: an alignment field, if desired. On output: the
* offsets of the alignment field
* @return the value passed in as toAppendTo.
*/
public StringBuffer format(Vector3D vector, StringBuffer toAppendTo,
FieldPosition pos) {
pos.setBeginIndex(0);
pos.setEndIndex(0);
// format prefix
toAppendTo.append(prefix);
// format components
formatDouble(vector.getX(), format, toAppendTo, pos);
toAppendTo.append(separator);
formatDouble(vector.getY(), format, toAppendTo, pos);
toAppendTo.append(separator);
formatDouble(vector.getZ(), format, toAppendTo, pos);
// format suffix
toAppendTo.append(suffix);
return toAppendTo;
}
/**
* Formats a object to produce a string.
* <p><code>obj</code> must be a {@link Vector3D} object. Any other type of
* object will result in an {@link IllegalArgumentException} being thrown.</p>
* @param obj the object to format.
* @param toAppendTo where the text is to be appended
* @param pos On input: an alignment field, if desired. On output: the
* offsets of the alignment field
* @return the value passed in as toAppendTo.
* @see java.text.Format#format(java.lang.Object, java.lang.StringBuffer, java.text.FieldPosition)
* @throws IllegalArgumentException is <code>obj</code> is not a valid type.
*/
@Override
public StringBuffer format(Object obj, StringBuffer toAppendTo,
FieldPosition pos) {
if (obj instanceof Vector3D) {
return format( (Vector3D)obj, toAppendTo, pos);
}
throw MathRuntimeException.createIllegalArgumentException(LocalizedFormats.CANNOT_FORMAT_INSTANCE_AS_3D_VECTOR,
obj.getClass().getName());
}
/**
* Parses a string to produce a {@link Vector3D} object.
* @param source the string to parse
* @return the parsed {@link Vector3D} object.
* @exception ParseException if the beginning of the specified string
* cannot be parsed.
*/
public Vector3D parse(String source) throws ParseException {
ParsePosition parsePosition = new ParsePosition(0);
Vector3D result = parse(source, parsePosition);
if (parsePosition.getIndex() == 0) {
throw MathRuntimeException.createParseException(
parsePosition.getErrorIndex(),
LocalizedFormats.UNPARSEABLE_3D_VECTOR, source);
}
return result;
}
/**
* Parses a string to produce a {@link Vector3D} object.
* @param source the string to parse
* @param pos input/ouput parsing parameter.
* @return the parsed {@link Vector3D} object.
*/
public Vector3D parse(String source, ParsePosition pos) {
int initialIndex = pos.getIndex();
// parse prefix
parseAndIgnoreWhitespace(source, pos);
if (!parseFixedstring(source, trimmedPrefix, pos)) {
return null;
}
// parse X component
parseAndIgnoreWhitespace(source, pos);
Number x = parseNumber(source, format, pos);
if (x == null) {
// invalid abscissa
// set index back to initial, error index should already be set
pos.setIndex(initialIndex);
return null;
}
// parse Y component
parseAndIgnoreWhitespace(source, pos);
if (!parseFixedstring(source, trimmedSeparator, pos)) {
return null;
}
parseAndIgnoreWhitespace(source, pos);
Number y = parseNumber(source, format, pos);
if (y == null) {
// invalid ordinate
// set index back to initial, error index should already be set
pos.setIndex(initialIndex);
return null;
}
// parse Z component
parseAndIgnoreWhitespace(source, pos);
if (!parseFixedstring(source, trimmedSeparator, pos)) {
return null;
}
parseAndIgnoreWhitespace(source, pos);
Number z = parseNumber(source, format, pos);
if (z == null) {
// invalid height
// set index back to initial, error index should already be set
pos.setIndex(initialIndex);
return null;
}
// parse suffix
parseAndIgnoreWhitespace(source, pos);
if (!parseFixedstring(source, trimmedSuffix, pos)) {
return null;
}
return new Vector3D(x.doubleValue(), y.doubleValue(), z.doubleValue());
}
/**
* Parses a string to produce a object.
* @param source the string to parse
* @param pos input/ouput parsing parameter.
* @return the parsed object.
* @see java.text.Format#parseObject(java.lang.String, java.text.ParsePosition)
*/
@Override
public Object parseObject(String source, ParsePosition pos) {
return parse(source, pos);
}
}