org.apache.cxf.attachment.LazyAttachmentCollection Maven / Gradle / Ivy
/**
* 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.cxf.attachment;
import java.io.IOException;
import java.util.AbstractCollection;
import java.util.AbstractSet;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import javax.activation.DataHandler;
import org.apache.cxf.message.Attachment;
public class LazyAttachmentCollection
implements Collection {
private AttachmentDeserializer deserializer;
private final List attachments = new ArrayList();
public LazyAttachmentCollection(AttachmentDeserializer deserializer) {
super();
this.deserializer = deserializer;
}
public List getLoadedAttachments() {
return attachments;
}
private void loadAll() {
try {
Attachment a = deserializer.readNext();
while (a != null) {
attachments.add(a);
a = deserializer.readNext();
}
} catch (IOException e) {
throw new RuntimeException(e);
}
}
/**
* Check for more attachments by attempting to deserialize the next attachment.
*
* @param shouldLoadNew if false, the "loaded attachments" List will not be changed.
* @return there is more attachment or not
* @throws IOException
*/
public boolean hasNext(boolean shouldLoadNew) throws IOException {
if (shouldLoadNew) {
Attachment a = deserializer.readNext();
if (a != null) {
attachments.add(a);
return true;
}
return false;
}
return deserializer.hasNext();
}
public boolean hasNext() throws IOException {
return hasNext(true);
}
public Iterator iterator() {
return new Iterator() {
int current;
boolean removed;
public boolean hasNext() {
if (attachments.size() > current) {
return true;
}
// check if there is another attachment
try {
Attachment a = deserializer.readNext();
if (a == null) {
return false;
} else {
attachments.add(a);
return true;
}
} catch (IOException e) {
throw new RuntimeException(e);
}
}
public Attachment next() {
Attachment a = attachments.get(current);
current++;
removed = false;
return a;
}
public void remove() {
if (removed) {
throw new IllegalStateException();
}
attachments.remove(--current);
removed = true;
}
};
}
public int size() {
loadAll();
return attachments.size();
}
public boolean add(Attachment arg0) {
return attachments.add(arg0);
}
public boolean addAll(Collection arg0) {
return attachments.addAll(arg0);
}
public void clear() {
attachments.clear();
}
public boolean contains(Object arg0) {
return attachments.contains(arg0);
}
public boolean containsAll(Collection arg0) {
return attachments.containsAll(arg0);
}
public boolean isEmpty() {
if (attachments.isEmpty()) {
return !iterator().hasNext();
}
return attachments.isEmpty();
}
public boolean remove(Object arg0) {
return attachments.remove(arg0);
}
public boolean removeAll(Collection arg0) {
return attachments.removeAll(arg0);
}
public boolean retainAll(Collection arg0) {
return attachments.retainAll(arg0);
}
public Object[] toArray() {
loadAll();
return attachments.toArray();
}
public T[] toArray(T[] arg0) {
loadAll();
return attachments.toArray(arg0);
}
public Map createDataHandlerMap() {
return new LazyAttachmentMap(this);
}
private static class LazyAttachmentMap implements Map {
LazyAttachmentCollection collection;
LazyAttachmentMap(LazyAttachmentCollection c) {
collection = c;
}
public void clear() {
collection.clear();
}
public boolean containsKey(Object key) {
Iterator it = collection.iterator();
while (it.hasNext()) {
Attachment at = it.next();
if (key.equals(at.getId())) {
return true;
}
}
return false;
}
public boolean containsValue(Object value) {
Iterator it = collection.iterator();
while (it.hasNext()) {
Attachment at = it.next();
if (value.equals(at.getDataHandler())) {
return true;
}
}
return false;
}
public DataHandler get(Object key) {
Iterator it = collection.iterator();
while (it.hasNext()) {
Attachment at = it.next();
if (key.equals(at.getId())) {
return at.getDataHandler();
}
}
return null;
}
public boolean isEmpty() {
return collection.isEmpty();
}
public int size() {
return collection.size();
}
public DataHandler remove(Object key) {
Iterator it = collection.iterator();
while (it.hasNext()) {
Attachment at = it.next();
if (key.equals(at.getId())) {
collection.remove(at);
return at.getDataHandler();
}
}
return null;
}
public DataHandler put(String key, DataHandler value) {
Attachment at = new AttachmentImpl(key, value);
collection.add(at);
return value;
}
public void putAll(Map t) {
for (Map.Entry ent : t.entrySet()) {
put(ent.getKey(), ent.getValue());
}
}
public Set> entrySet() {
return new AbstractSet>() {
public Iterator> iterator() {
return new Iterator>() {
Iterator it = collection.iterator();
public boolean hasNext() {
return it.hasNext();
}
public Map.Entry next() {
return new Map.Entry() {
Attachment at = it.next();
public String getKey() {
return at.getId();
}
public DataHandler getValue() {
return at.getDataHandler();
}
public DataHandler setValue(DataHandler value) {
if (at instanceof AttachmentImpl) {
DataHandler h = at.getDataHandler();
((AttachmentImpl)at).setDataHandler(value);
return h;
} else {
throw new UnsupportedOperationException();
}
}
};
}
public void remove() {
it.remove();
}
};
}
public int size() {
return collection.size();
}
};
}
public Set keySet() {
return new AbstractSet() {
public Iterator iterator() {
return new Iterator() {
Iterator it = collection.iterator();
public boolean hasNext() {
return it.hasNext();
}
public String next() {
return it.next().getId();
}
public void remove() {
it.remove();
}
};
}
public int size() {
return collection.size();
}
};
}
public Collection values() {
return new AbstractCollection() {
public Iterator iterator() {
return new Iterator() {
Iterator it = collection.iterator();
public boolean hasNext() {
return it.hasNext();
}
public DataHandler next() {
return it.next().getDataHandler();
}
public void remove() {
it.remove();
}
};
}
public int size() {
return collection.size();
}
};
}
}
}