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/****************************************************************
* 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.message;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import org.apache.james.mime4j.AbstractContentHandler;
import org.apache.james.mime4j.MimeStreamParser;
import org.apache.james.mime4j.field.ContentTypeField;
import org.apache.james.mime4j.field.Field;
import org.apache.james.mime4j.util.CharsetUtil;
/**
* The header of an entity (see RFC 2045).
*
*
* @version $Id: Header.java,v 1.3 2004/10/04 15:36:44 ntherning Exp $
*/
public class Header {
private List<Field> fields = new LinkedList<Field>();
private HashMap<String, List<Field>> fieldMap = new HashMap<String, List<Field>>();
/**
* Creates a new empty <code>Header</code>.
*/
public Header() {
}
/**
* Creates a new <code>Header</code> from the specified stream.
*
* @param is the stream to read the header from.
*/
public Header(InputStream is) throws IOException {
final MimeStreamParser parser = new MimeStreamParser();
parser.setContentHandler(new AbstractContentHandler() {
@Override
public void endHeader() {
parser.stop();
}
@Override
public void field(String fieldData) {
addField(Field.parse(fieldData));
}
});
parser.parse(is);
}
/**
* Adds a field to the end of the list of fields.
*
* @param field the field to add.
*/
public void addField(Field field) {
List<Field> values = fieldMap.get(field.getName().toLowerCase());
if (values == null) {
values = new LinkedList<Field>();
fieldMap.put(field.getName().toLowerCase(), values);
}
values.add(field);
fields.add(field);
}
/**
* Gets the fields of this header. The returned list will not be
* modifiable.
*
* @return the list of <code>Field</code> objects.
*/
public List<Field> getFields() {
return Collections.unmodifiableList(fields);
}
/**
* Gets a <code>Field</code> given a field name. If there are multiple
* such fields defined in this header the first one will be returned.
*
* @param name the field name (e.g. From, Subject).
* @return the field or <code>null</code> if none found.
*/
public Field getField(String name) {
List<Field> l = fieldMap.get(name.toLowerCase());
if (l != null && !l.isEmpty()) {
return l.get(0);
}
return null;
}
/**
* Gets all <code>Field</code>s having the specified field name.
*
* @param name the field name (e.g. From, Subject).
* @return the list of fields.
*/
public List<Field> getFields(String name) {
List<Field> l = fieldMap.get(name.toLowerCase());
return Collections.unmodifiableList(l);
}
/**
* Return Header Object as String representation. Each headerline is
* seperated by "\r\n"
*
* @return headers
*/
@Override
public String toString() {
StringBuffer str = new StringBuffer();
for (Iterator<Field> it = fields.iterator(); it.hasNext();) {
str.append(it.next().toString());
str.append("\r\n");
}
return str.toString();
}
/**
* Write the Header to the given OutputStream
*
* @param out the OutputStream to write to
* @throws IOException
*/
public void writeTo(OutputStream out) throws IOException {
String charString = ((ContentTypeField) getField(Field.CONTENT_TYPE)).getCharset();
BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(out, CharsetUtil.getCharset(charString)),8192);
writer.write(toString()+ "\r\n");
writer.flush();
}
}
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