package org.etk.core.rest.impl;
import java.util.AbstractSet;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.NoSuchElementException;
import java.util.Set;
import javax.ws.rs.core.MultivaluedMap;
/**
* Read only case insensitive {@link MultivaluedMap}.
*
* @author <a href="mailto:andrew00x@gmail.com">Andrey Parfonov</a>
* @version $Id: $
*/
// TODO this implementation is not efficient, probably can be better extend
// java.util.AbstractMap
public final class InputHeadersMap extends HashMap<String, List<String>>
implements MultivaluedMap<String, String> {
/**
* Generated by Eclipse.
*/
private static final long serialVersionUID = -4181622019478475004L;
/**
* See {@link Map#entrySet()}.
*/
private transient Set<Map.Entry<String, List<String>>> entrySet;
/**
* See {@link Map#keySet()}.
*/
private transient Set<String> keySet;
/**
* See {@link Map#values()}.
*/
private transient Set<List<String>> valueSet;
/**
* Source {@link Map}.
*/
private final Map<String, List<String>> m;
/**
* @param m source map.
*/
public InputHeadersMap(Map<String, List<String>> m) {
if (m == null)
throw new NullPointerException();
this.m = new HashMap<String, List<String>>(m.size());
for (Map.Entry<String, List<String>> e : m.entrySet())
this.m.put(e.getKey().toLowerCase(), Collections.unmodifiableList(e.getValue()));
}
// Helper classes
/**
* Abstraction for read-only {@link Map.Entry}. All extended classes of this
* abstraction is also read-only.
*
* @param <K> key parameter
* @param <V> value parameter
*/
private abstract class AbstractReadOnlyEntry<K, V> implements Map.Entry<K, V> {
/**
* Entry is read-only. {@inheritDoc}
*/
public final V setValue(V value) {
throw new UnsupportedOperationException();
}
}
/**
* Abstraction of read-only iterator, method {@link Iterator#remove()} throws
* {@link UnsupportedOperationException}. All extended classes of this
* abstraction is also read-only.
*
* @param <T> iterable parameter
*/
private abstract class AbstractReadOnlyIterator<T> implements Iterator<T> {
/**
* Iterator is read-only. {@inheritDoc}
*/
public final void remove() {
throw new UnsupportedOperationException();
}
}
/**
* Abstraction of read-only {@link Set}, all methods which can change it
* throws {@link UnsupportedOperationException}. All extended classes of this
* abstraction is also read-only.
*
* @param <T> Set parameter
*/
private abstract class AbstractReadOnlySet<T> extends AbstractSet<T> {
/**
* {@inheritDoc}
*/
@Override
public final boolean removeAll(Collection<?> c) {
throw new UnsupportedOperationException();
}
/**
* {@inheritDoc}
*/
@Override
public final boolean add(T o) {
throw new UnsupportedOperationException();
}
/**
* {@inheritDoc}
*/
@Override
public final boolean addAll(Collection<? extends T> c) {
throw new UnsupportedOperationException();
}
/**
* {@inheritDoc}
*/
@Override
public final void clear() {
throw new UnsupportedOperationException();
}
/**
* {@inheritDoc}
*/
@Override
public final boolean remove(Object o) {
throw new UnsupportedOperationException();
}
/**
* {@inheritDoc}
*/
@Override
public final boolean retainAll(Collection<?> c) {
throw new UnsupportedOperationException();
}
}
// HasMap
/**
* {@inheritDoc}
*/
public List<String> get(Object o) {
if (o != null)
return m.get(((String) o).toLowerCase());
return m.get(o);
}
/**
* {@inheritDoc}
*/
public Set<Map.Entry<String, List<String>>> entrySet() {
if (entrySet == null)
createEntrySet();
return entrySet;
}
/**
* {@inheritDoc}
*/
public Set<String> keySet() {
if (keySet == null)
keySet = Collections.unmodifiableSet(m.keySet());
return keySet;
}
/**
* {@inheritDoc}
*/
public Set<List<String>> values() {
if (valueSet == null)
createValues();
return valueSet;
}
/**
* {@inheritDoc}
*/
public List<String> remove(Object key) {
throw new UnsupportedOperationException();
}
/**
* {@inheritDoc}
*/
public void clear() {
throw new UnsupportedOperationException();
}
/**
* {@inheritDoc}
*/
public List<String> put(String k, List<String> v) {
throw new UnsupportedOperationException();
}
/**
* {@inheritDoc}
*/
public void putAll(Map<? extends String, ? extends List<String>> m0) {
throw new UnsupportedOperationException();
}
// MultivaluedMap
/**
* {@inheritDoc}
*/
public void add(String key, String value) {
throw new UnsupportedOperationException();
}
/**
* {@inheritDoc}
*/
public String getFirst(String key) {
List<String> list = get(key);
return list != null && list.size() > 0 ? list.get(0) : null;
}
/**
* {@inheritDoc}
*/
public void putSingle(String key, String value) {
throw new UnsupportedOperationException();
}
// helpers methods
/**
* Create read only EntrySet.
*/
private void createEntrySet() {
entrySet =
new AbstractReadOnlySet<Map.Entry<String, List<String>>>() {
@Override
public Iterator<Map.Entry<String, List<String>>> iterator() {
return new AbstractReadOnlyIterator<Map.Entry<String, List<String>>>() {
private final Iterator<Map.Entry<String, List<String>>> i = m.entrySet().iterator();
public boolean hasNext() {
return i.hasNext();
}
public java.util.Map.Entry<String, List<String>> next() {
return new AbstractReadOnlyEntry<String, List<String>>() {
private final Map.Entry<String, List<String>> e = i.next();
public String getKey() {
return e.getKey();
}
public List<String> getValue() {
return e.getValue();
}
};
}
};
}
@Override
public int size() {
return m.size();
}
};
}
/**
* Create read only values.
*/
private void createValues() {
valueSet =
new AbstractReadOnlySet<List<String>>() {
@Override
public Iterator<List<String>> iterator() {
return new AbstractReadOnlyIterator<List<String>>() {
private final Iterator<String> i = m.keySet().iterator();
public boolean hasNext() {
return i.hasNext();
}
public List<String> next() {
if (!i.hasNext())
throw new NoSuchElementException();
return m.get(i.next());
}
};
}
@Override
public int size() {
return m.size();
}
};
}
}