| /* 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); |
| } |
| |
| } |