/*
 * 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.
 */

/* $Id: ConversionUtils.java 1071064 2011-02-15 21:09:15Z adelmelle $ */

package org.apache.fop.util;

This class contains utility methods for conversions, like
a java.lang.String to an array of int or double.
/**
 * This class contains utility methods for conversions, like
 * a java.lang.String to an array of int or double.
 */
public final class ConversionUtils {

    private ConversionUtils() {
    }

    
Converts the given base String into
an array of int, splitting the base along the
given separator pattern.
Note: this method assumes the input is a string containing
only decimal integers, signed or unsigned, that are parsable
by java.lang.Integer.parseInt(String). If this
is not the case, the resulting NumberFormatException
will have to be handled by the caller.
Params:
baseString –    the base string
separatorPattern –  the pattern separating the integer values
       (if this is null, the baseString is parsed as one
        integer value)
Returns:
 an array of int whose size is equal to the number
         values in the input string; null if this number
         is equal to zero./**
     * Converts the given base <code>String</code> into
     * an array of <code>int</code>, splitting the base along the
     * given separator pattern.
     * <em>Note: this method assumes the input is a string containing
     * only decimal integers, signed or unsigned, that are parsable
     * by <code>java.lang.Integer.parseInt(String)</code>. If this
     * is not the case, the resulting <code>NumberFormatException</code>
     * will have to be handled by the caller.</em>
     *
     * @param baseString    the base string
     * @param separatorPattern  the pattern separating the integer values
     *        (if this is <code>null</code>, the baseString is parsed as one
     *         integer value)
     * @return  an array of <code>int</code> whose size is equal to the number
     *          values in the input string; <code>null</code> if this number
     *          is equal to zero.
     */
    public static int[] toIntArray(String baseString, String separatorPattern) {

        if (baseString == null || "".equals(baseString)) {
            return null;
        }

        if (separatorPattern == null || "".equals(separatorPattern)) {
            return new int[] {Integer.parseInt(baseString)};
        }

        String[] values = baseString.split(separatorPattern);
        int numValues = values.length;
        if (numValues == 0) {
            return null;
        }

        int[] returnArray = new int[numValues];
        for (int i = 0; i < numValues; ++i) {
            returnArray[i] = Integer.parseInt(values[i]);
        }
        return returnArray;

    }

    
Converts the given base String into
an array of double, splitting the base along the
given separator pattern.
Note: this method assumes the input is a string containing
only decimal doubles, signed or unsigned, that are parsable
by java.lang.Double.parseDouble(String). If this
is not the case, the resulting NumberFormatException
will have to be handled by the caller.
Params:
baseString –    the base string
separatorPattern –  the pattern separating the integer values
       (if this is null, the baseString is parsed as one
        double value)
Returns:
 an array of double whose size is equal to the number
         values in the input string; null if this number
         is equal to zero./**
     * Converts the given base <code>String</code> into
     * an array of <code>double</code>, splitting the base along the
     * given separator pattern.
     * <em>Note: this method assumes the input is a string containing
     * only decimal doubles, signed or unsigned, that are parsable
     * by <code>java.lang.Double.parseDouble(String)</code>. If this
     * is not the case, the resulting <code>NumberFormatException</code>
     * will have to be handled by the caller.</em>
     *
     * @param baseString    the base string
     * @param separatorPattern  the pattern separating the integer values
     *        (if this is <code>null</code>, the baseString is parsed as one
     *         double value)
     * @return  an array of <code>double</code> whose size is equal to the number
     *          values in the input string; <code>null</code> if this number
     *          is equal to zero.
     */
    public static double[] toDoubleArray(String baseString, String separatorPattern) {

        if (baseString == null || "".equals(baseString)) {
            return null;
        }

        if (separatorPattern == null || "".equals(separatorPattern)) {
            return new double[] {Double.parseDouble(baseString)};
        }

        String[] values = baseString.split(separatorPattern);
        int numValues = values.length;
        if (numValues == 0) {
            return null;
        }

        double[] returnArray = new double[numValues];
        for (int i = 0; i < numValues; ++i) {
            returnArray[i] = Double.parseDouble(values[i]);
        }
        return returnArray;

    }

}