org.archive.util.anvl.SubElement Maven / Gradle / Ivy
/*
* This file is part of the Heritrix web crawler (crawler.archive.org).
*
* Licensed to the Internet Archive (IA) by one or more individual
* contributors.
*
* The IA 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.archive.util.anvl;
/**
* Abstract ANVL 'data element' sub-part.
* Subclass to make a Comment, a Label, or a Value.
* @author stack
*/
abstract class SubElement {
private final String e;
protected SubElement() {
this(null);
}
public SubElement(final String s) {
this.e = baseCheck(s);
}
protected String baseCheck(final String s) {
// Check for null.
if (s == null) {
throw new IllegalArgumentException("Can't be null");
}
// Check for CRLF.
for (int i = 0; i < s.length(); i++) {
checkCharacter(s.charAt(i), s, i);
}
return s;
}
protected void checkCharacter(final char c, final String srcStr,
final int index) {
checkControlCharacter(c, srcStr, index);
checkCRLF(c, srcStr, index);
}
protected void checkControlCharacter(final char c, final String srcStr,
final int index) {
if (Character.isISOControl(c) && !Character.isWhitespace(c) ||
!Character.isValidCodePoint(c)) {
throw new IllegalArgumentException(srcStr +
" contains a control character(s) or invalid code point: 0x" +
Integer.toHexString(c));
}
}
protected void checkCRLF(final char c, final String srcStr,
final int index) {
if (ANVLRecord.isCROrLF(c)) {
throw new IllegalArgumentException(srcStr +
" contains disallowed CRLF control character(s): 0x" +
Integer.toHexString(c));
}
}
@Override
public String toString() {
return e;
}
}