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+/*
+ * 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;
+
+import org.apache.commons.math3.exception.MathParseException;
+import org.apache.commons.math3.util.CompositeFormat;
+
+import java.text.FieldPosition;
+import java.text.NumberFormat;
+import java.text.ParsePosition;
+import java.util.Locale;
+
+/**
+ * Formats a 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>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><b>Note:</b> 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.
+ *
+ * @param <S> Type of the space.
+ * @since 3.0
+ */
+public abstract class VectorFormat<S extends Space> {
+
+ /** The default prefix: "{". */
+ public static final String DEFAULT_PREFIX = "{";
+
+ /** The default suffix: "}". */
+ public static final String DEFAULT_SUFFIX = "}";
+
+ /** The default separator: ", ". */
+ public 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.
+ */
+ protected VectorFormat() {
+ this(
+ 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.
+ */
+ protected VectorFormat(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 "; "
+ */
+ protected VectorFormat(final String prefix, final String suffix, final String separator) {
+ this(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.
+ */
+ protected VectorFormat(
+ 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 point/vector formats are available.
+ *
+ * <p>This is the same set as the {@link NumberFormat} set.
+ *
+ * @return available point/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;
+ }
+
+ /**
+ * Formats a {@link Vector} object to produce a string.
+ *
+ * @param vector the object to format.
+ * @return a formatted string.
+ */
+ public String format(Vector<S> vector) {
+ return format(vector, new StringBuffer(), new FieldPosition(0)).toString();
+ }
+
+ /**
+ * Formats a {@link Vector} 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 abstract StringBuffer format(
+ Vector<S> vector, StringBuffer toAppendTo, FieldPosition pos);
+
+ /**
+ * Formats the coordinates of a {@link Vector} to produce a string.
+ *
+ * @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
+ * @param coordinates coordinates of the object to format.
+ * @return the value passed in as toAppendTo.
+ */
+ protected StringBuffer format(
+ StringBuffer toAppendTo, FieldPosition pos, double... coordinates) {
+
+ pos.setBeginIndex(0);
+ pos.setEndIndex(0);
+
+ // format prefix
+ toAppendTo.append(prefix);
+
+ // format components
+ for (int i = 0; i < coordinates.length; ++i) {
+ if (i > 0) {
+ toAppendTo.append(separator);
+ }
+ CompositeFormat.formatDouble(coordinates[i], format, toAppendTo, pos);
+ }
+
+ // format suffix
+ toAppendTo.append(suffix);
+
+ return toAppendTo;
+ }
+
+ /**
+ * Parses a string to produce a {@link Vector} object.
+ *
+ * @param source the string to parse
+ * @return the parsed {@link Vector} object.
+ * @throws MathParseException if the beginning of the specified string cannot be parsed.
+ */
+ public abstract Vector<S> parse(String source) throws MathParseException;
+
+ /**
+ * Parses a string to produce a {@link Vector} object.
+ *
+ * @param source the string to parse
+ * @param pos input/output parsing parameter.
+ * @return the parsed {@link Vector} object.
+ */
+ public abstract Vector<S> parse(String source, ParsePosition pos);
+
+ /**
+ * Parses a string to produce an array of coordinates.
+ *
+ * @param dimension dimension of the space
+ * @param source the string to parse
+ * @param pos input/output parsing parameter.
+ * @return coordinates array.
+ */
+ protected double[] parseCoordinates(int dimension, String source, ParsePosition pos) {
+
+ int initialIndex = pos.getIndex();
+ double[] coordinates = new double[dimension];
+
+ // parse prefix
+ CompositeFormat.parseAndIgnoreWhitespace(source, pos);
+ if (!CompositeFormat.parseFixedstring(source, trimmedPrefix, pos)) {
+ return null;
+ }
+
+ for (int i = 0; i < dimension; ++i) {
+
+ // skip whitespace
+ CompositeFormat.parseAndIgnoreWhitespace(source, pos);
+
+ // parse separator
+ if (i > 0 && !CompositeFormat.parseFixedstring(source, trimmedSeparator, pos)) {
+ return null;
+ }
+
+ // skip whitespace
+ CompositeFormat.parseAndIgnoreWhitespace(source, pos);
+
+ // parse coordinate
+ Number c = CompositeFormat.parseNumber(source, format, pos);
+ if (c == null) {
+ // invalid coordinate
+ // set index back to initial, error index should already be set
+ pos.setIndex(initialIndex);
+ return null;
+ }
+
+ // store coordinate
+ coordinates[i] = c.doubleValue();
+ }
+
+ // parse suffix
+ CompositeFormat.parseAndIgnoreWhitespace(source, pos);
+ if (!CompositeFormat.parseFixedstring(source, trimmedSuffix, pos)) {
+ return null;
+ }
+
+ return coordinates;
+ }
+}