| /**************************************************************** |
| * 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.util.ArrayList; |
| import java.util.Collections; |
| import java.util.HashMap; |
| import java.util.Iterator; |
| import java.util.LinkedList; |
| import java.util.List; |
| import java.util.Locale; |
| import java.util.Map; |
| |
| import org.apache.james.mime4j.dom.Header; |
| import org.apache.james.mime4j.stream.Field; |
| |
| /** |
| * Abstract MIME header. |
| */ |
| public abstract class AbstractHeader implements Header { |
| |
| private final List<Field> fields = new LinkedList<Field>(); |
| private final Map<String, List<Field>> fieldMap = new HashMap<String, List<Field>>(); |
| |
| /** |
| * Creates a new empty <code>Header</code>. |
| */ |
| public AbstractHeader() { |
| } |
| |
| /** |
| * Creates a new <code>Header</code> from the specified |
| * <code>Header</code>. The <code>Header</code> instance is initialized |
| * with a copy of the list of {@link Field}s of the specified |
| * <code>Header</code>. The <code>Field</code> objects are not copied |
| * because they are immutable and can safely be shared between headers. |
| * |
| * @param other |
| * header to copy. |
| */ |
| public AbstractHeader(Header other) { |
| for (Field otherField : other.getFields()) { |
| addField(otherField); |
| } |
| } |
| |
| /** |
| * 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(Locale.US)); |
| if (values == null) { |
| values = new LinkedList<Field>(); |
| fieldMap.put(field.getName().toLowerCase(Locale.US), 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 the fields of this header. The returned map will not be |
| * modifiable. For each header name, values are ordered by which |
| * they appear in the underlying entity. |
| * |
| * @return the map of <code>Field</code> objects indexed by names. |
| */ |
| @Override |
| public Map<String, List<Field>> getFieldsAsMap() { |
| return Collections.unmodifiableMap(fieldMap); |
| } |
| |
| /** |
| * 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(Locale.US)); |
| if (l != null && !l.isEmpty()) { |
| return l.get(0); |
| } |
| return null; |
| } |
| |
| /** |
| * Gets a <code>Field</code> given a field name and of the given type. |
| * 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). |
| * @param clazz the field class. |
| * @return the field or <code>null</code> if none found. |
| */ |
| public <F extends Field> F getField(final String name, final Class<F> clazz) { |
| List<Field> l = fieldMap.get(name.toLowerCase(Locale.US)); |
| for (int i = 0; i < l.size(); i++) { |
| Field field = l.get(i); |
| if (clazz.isInstance(field)) { |
| return clazz.cast(field); |
| } |
| } |
| 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(final String name) { |
| final String lowerCaseName = name.toLowerCase(Locale.US); |
| final List<Field> l = fieldMap.get(lowerCaseName); |
| final List<Field> results; |
| if (l == null || l.isEmpty()) { |
| results = Collections.emptyList(); |
| } else { |
| results = Collections.unmodifiableList(l); |
| } |
| return results; |
| } |
| |
| /** |
| * Gets all <code>Field</code>s having the specified field name |
| * and of the given type. |
| * |
| * @param name the field name (e.g. From, Subject). |
| * @param clazz the field class. |
| * @return the list of fields. |
| */ |
| public <F extends Field> List<F> getFields(final String name, final Class<F> clazz) { |
| final String lowerCaseName = name.toLowerCase(Locale.US); |
| final List<Field> l = fieldMap.get(lowerCaseName); |
| if (l == null) { |
| return Collections.emptyList(); |
| } |
| final List<F> results = new ArrayList<F>(); |
| for (int i = 0; i < l.size(); i++) { |
| Field field = l.get(i); |
| if (clazz.isInstance(field)) { |
| results.add(clazz.cast(field)); |
| } |
| } |
| return results; |
| } |
| |
| /** |
| * Returns an iterator over the list of fields of this header. |
| * |
| * @return an iterator. |
| */ |
| public Iterator<Field> iterator() { |
| return Collections.unmodifiableList(fields).iterator(); |
| } |
| |
| /** |
| * Removes all <code>Field</code>s having the specified field name. |
| * |
| * @param name |
| * the field name (e.g. From, Subject). |
| * @return number of fields removed. |
| */ |
| public int removeFields(String name) { |
| final String lowerCaseName = name.toLowerCase(Locale.US); |
| List<Field> removed = fieldMap.remove(lowerCaseName); |
| if (removed == null || removed.isEmpty()) |
| return 0; |
| |
| for (Iterator<Field> iterator = fields.iterator(); iterator.hasNext();) { |
| Field field = iterator.next(); |
| if (field.getName().equalsIgnoreCase(name)) |
| iterator.remove(); |
| } |
| |
| return removed.size(); |
| } |
| |
| /** |
| * Sets or replaces a field. This method is useful for header fields such as |
| * Subject or Message-ID that should not occur more than once in a message. |
| * |
| * If this <code>Header</code> does not already contain a header field of |
| * the same name as the given field then it is added to the end of the list |
| * of fields (same behavior as {@link #addField(Field)}). Otherwise the |
| * first occurrence of a field with the same name is replaced by the given |
| * field and all further occurrences are removed. |
| * |
| * @param field the field to set. |
| */ |
| public void setField(Field field) { |
| final String lowerCaseName = field.getName().toLowerCase(Locale.US); |
| List<Field> l = fieldMap.get(lowerCaseName); |
| if (l == null || l.isEmpty()) { |
| addField(field); |
| return; |
| } |
| |
| l.clear(); |
| l.add(field); |
| |
| int firstOccurrence = -1; |
| int index = 0; |
| for (Iterator<Field> iterator = fields.iterator(); iterator.hasNext(); index++) { |
| Field f = iterator.next(); |
| if (f.getName().equalsIgnoreCase(field.getName())) { |
| iterator.remove(); |
| |
| if (firstOccurrence == -1) |
| firstOccurrence = index; |
| } |
| } |
| |
| fields.add(firstOccurrence, field); |
| } |
| |
| /** |
| * Return Header Object as String representation. Each headerline is |
| * seperated by "\r\n" |
| * |
| * @return headers |
| */ |
| @Override |
| public String toString() { |
| StringBuilder str = new StringBuilder(128); |
| for (Field field : fields) { |
| str.append(field.toString()); |
| str.append("\r\n"); |
| } |
| return str.toString(); |
| } |
| |
| } |