/*
* ModeShape (http://www.modeshape.org)
*
* 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.modeshape.common.text;
import java.text.CharacterIterator;
import java.text.StringCharacterIterator;
import java.util.BitSet;
public class QuoteEncoder implements TextDecoder, TextEncoder {
private static final BitSet ESCAPE_CHARACTERS = new BitSet(256);
public static final char ESCAPE_CHARACTER = '\\';
static {
ESCAPE_CHARACTERS.set('"');
ESCAPE_CHARACTERS.set('\\');
ESCAPE_CHARACTERS.set('\n');
ESCAPE_CHARACTERS.set('\t');
}
public QuoteEncoder() {
}
@Override
public String decode( String encodedText ) {
if (encodedText == null) return null;
if (encodedText.length() == 0) return "";
final StringBuilder result = new StringBuilder();
final CharacterIterator iter = new StringCharacterIterator(encodedText);
for (char c = iter.first(); c != CharacterIterator.DONE; c = iter.next()) {
if (c == ESCAPE_CHARACTER) {
// Eat this escape character, and process the next character ...
char nextChar = iter.next();
if (nextChar == 'n') {
result.append('\n');
} else if (nextChar == 't') {
result.append('\t');
} else if (nextChar == 'r') {
result.append('\r');
} else if (nextChar == 'f') {
result.append('\f');
} else {
result.append(nextChar);
}
} else {
result.append(c);
}
}
return result.toString();
}
@Override
public String encode( String text ) {
final StringBuilder result = new StringBuilder();
final CharacterIterator iter = new StringCharacterIterator(text);
for (char c = iter.first(); c != CharacterIterator.DONE; c = iter.next()) {
if (ESCAPE_CHARACTERS.get(c)) {
result.append(ESCAPE_CHARACTER);
if (c == '\n') {
result.append('n');
} else if (c == '\t') {
result.append('t');
} else if (c == '\r') {
result.append('r');
} else if (c == '\f') {
result.append('f');
}
} else {
result.append(c);
}
}
return result.toString();
}
}