/****************************************************************
* 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. *
****************************************************************/
package org.apache.james.mime4j.stream;
import java.util.BitSet;
import org.apache.james.mime4j.MimeException;
import org.apache.james.mime4j.io.MaxHeaderLengthLimitException;
import org.apache.james.mime4j.util.ByteArrayBuffer;
/**
* Default implementation of {@link FieldBuilder}.
*
*/
public class DefaultFieldBuilder implements FieldBuilder {
private static final BitSet FIELD_CHARS = new BitSet();
static {
for (int i = 0x21; i <= 0x39; i++) {
FIELD_CHARS.set(i);
}
for (int i = 0x3b; i <= 0x7e; i++) {
FIELD_CHARS.set(i);
}
}
private final ByteArrayBuffer buf;
private final int maxlen;
public DefaultFieldBuilder(int maxlen) {
this.buf = new ByteArrayBuffer(1024);
this.maxlen = maxlen;
}
public void reset() {
this.buf.clear();
}
public void append(final ByteArrayBuffer line) throws MaxHeaderLengthLimitException {
if (line == null) {
return;
}
int len = line.length();
if (this.maxlen > 0 && this.buf.length() + len >= this.maxlen) {
throw new MaxHeaderLengthLimitException("Maximum header length limit exceeded");
}
this.buf.append(line.buffer(), 0, line.length());
}
public RawField build() throws MimeException {
int len = this.buf.length();
if (len > 0) {
if (this.buf.byteAt(len - 1) == '\n') {
len --;
}
if (this.buf.byteAt(len - 1) == '\r') {
len --;
}
}
ByteArrayBuffer copy = new ByteArrayBuffer(this.buf.buffer(), len, false);
RawField field = RawFieldParser.DEFAULT.parseField(copy);
String name = field.getName();
for (int i = 0; i < name.length(); i++) {
char ch = name.charAt(i);
if (!FIELD_CHARS.get(ch)) {
throw new MimeException("MIME field name contains illegal characters: "
+ field.getName());
}
}
return field;
}
public ByteArrayBuffer getRaw() {
return this.buf;
}
}