org.apache.xmlbeans.impl.common.XmlWhitespace Maven / Gradle / Ivy

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The Apache Commons Codec package contains simple encoder and decoders for various formats such as Base64 and Hexadecimal. In addition to these widely used encoders and decoders, the codec package also maintains a collection of phonetic encoding utilities.
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/*   Copyright 2004 The Apache Software Foundation
 *
 *   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 org.apache.xmlbeans.impl.common;

import org.apache.xmlbeans.SchemaType;

public class XmlWhitespace
{
    public static final int WS_UNSPECIFIED = SchemaType.WS_UNSPECIFIED;
    public static final int WS_PRESERVE = SchemaType.WS_PRESERVE;
    public static final int WS_REPLACE = SchemaType.WS_REPLACE;
    public static final int WS_COLLAPSE = SchemaType.WS_COLLAPSE;


    public static boolean isSpace(char ch)
    {
        switch (ch)
        {
            case ' ':
            case '\n':
            case '\r':
            case '\t':
                return true;
        }
        return false;
    }

    public static boolean isAllSpace(String v)
    {
        for (int i = 0, len = v.length(); i < len; i++)
        {
            if (!isSpace(v.charAt(i)))
                return false;
        }
        return true;
    }

    public static boolean isAllSpace(CharSequence v)
    {
        for (int i = 0, len = v.length(); i < len; i++)
        {
            if (!isSpace(v.charAt(i)))
                return false;
        }
        return true;
    }

    public static String collapse(String v)
    {
        return collapse(v, XmlWhitespace.WS_COLLAPSE);
    }

    /**
     * The algorithm used by apply_wscanon: sometimes used in impls.
     */
    public static String collapse(String v, int wsr)
    {
        if (wsr == SchemaType.WS_PRESERVE || wsr == SchemaType.WS_UNSPECIFIED)
            return v;

        if (v.indexOf('\n') >= 0)
            v = v.replace('\n', ' ');
        if (v.indexOf('\t') >= 0)
            v = v.replace('\t', ' ');
        if (v.indexOf('\r') >= 0)
            v = v.replace('\r', ' ');

        if (wsr == SchemaType.WS_REPLACE)
            return v;

        int j = 0;
        int len = v.length();
        if (len == 0)
            return v;

        int i;

        /* a trick: examine every other character looking for pairs of spaces */
        if (v.charAt(0) != ' ')
        {
            examine: {
                for (j = 2; j < len; j += 2)
                {
                    if (v.charAt(j) == ' ')
                    {
                        if (v.charAt(j - 1) == ' ')
                            break examine;
                        if (j == len - 1)
                            break examine;
                        j++;
                        if (v.charAt(j) == ' ')
                            break examine;
                    }
                }
                if (j == len && v.charAt(j - 1) == ' ')
                    break examine;
                return v;
            }
            /* j is pointing at the first ws to be removed, or past end */
            i = j;
        }
        else
        {
            /**
             * j is pointing at the last whitespace in the initial run
             */
            while (j + 1 < v.length() && v.charAt(j + 1) == ' ')
                j += 1;
            i = 0;
        }

        char[] ch = v.toCharArray();

        shifter: for (;;)
        {
            for (;;)
            {
                /* j was ws or past end */
                j++;
                if (j >= len)
                    break shifter;
                if (v.charAt(j) != ' ')
                    break;
            }
            for (;;)
            {
                /* j was nonws */
                ch[i++] = ch[j++];
                if (j >= len)
                    break shifter;
                if (ch[j] == ' ')
                {
                    ch[i++] = ch[j++];
                    if (j >= len)
                        break shifter;
                    if (ch[j] == ' ')
                        break;
                }
            }
        }

        return new String(ch, 0, (i == 0 || ch[i - 1] != ' ') ? i : i - 1);
    }
}