RequestAttr.java

package com.sixd.sly;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Enumeration;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;

import org.apache.sling.api.SlingHttpServletRequest;

public class RequestAttr implements Map<String, Object> {

	private SlingHttpServletRequest request;

	public RequestAttr(SlingHttpServletRequest request) {
		this.request = request;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see java.util.Map#size()
	 */
	@Override
	public int size() {
		int i = 0;
		Enumeration<?> attrNames = request.getAttributeNames();
		while (attrNames.hasMoreElements()) {
			i++;
			attrNames.nextElement();
		}
		return i;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see java.util.Map#isEmpty()
	 */
	@Override
	public boolean isEmpty() {
		return size() > 0;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see java.util.Map#containsKey(java.lang.Object)
	 */
	@Override
	public boolean containsKey(Object key) {
		Enumeration<?> attrNames = request.getAttributeNames();
		while (attrNames.hasMoreElements()) {
			Object attr = attrNames.nextElement();
			if (attr.equals(key)) {
				return true;
			}
		}
		return false;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see java.util.Map#containsValue(java.lang.Object)
	 */
	@Override
	public boolean containsValue(Object value) {
		Enumeration<?> attrNames = request.getAttributeNames();
		while (attrNames.hasMoreElements()) {
			Object attr = attrNames.nextElement();
			if (request.getAttribute((String) attr).equals(value)) {
				return true;
			}
		}
		return false;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see java.util.Map#get(java.lang.Object)
	 */
	@Override
	public Object get(Object key) {
		Object value = request.getAttribute((String) key);
		return value;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see java.util.Map#put(java.lang.Object, java.lang.Object)
	 */
	@Override
	public Object put(String key, Object value) {
		request.setAttribute((String) key, value);
		return value;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see java.util.Map#remove(java.lang.Object)
	 */
	@Override
	public Object remove(Object key) {
		Object oldValue = get(key);
		request.removeAttribute((String) key);
		return oldValue;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see java.util.Map#putAll(java.util.Map)
	 */
	@Override
	public void putAll(Map<? extends String, ? extends Object> m) {
		for (Map.Entry<? extends String, ? extends Object> entry : m.entrySet()) {
			put(entry.getKey(), entry.getValue());
		}
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see java.util.Map#clear()
	 */
	@Override
	public void clear() {
		throw new UnsupportedOperationException();
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see java.util.Map#keySet()
	 */
	@Override
	public Set<String> keySet() {
		Set<String> keys = new HashSet<String>();
		Enumeration<?> attrNames = request.getAttributeNames();
		while (attrNames.hasMoreElements()) {
			String attr = (String) attrNames.nextElement();
			keys.add(attr);
		}
		return keys;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see java.util.Map#values()
	 */
	@Override
	public Collection<Object> values() {
		Collection<Object> values = new ArrayList<Object>();
		Enumeration<?> attrNames = request.getAttributeNames();
		while (attrNames.hasMoreElements()) {
			String attr = (String) attrNames.nextElement();
			values.add(request.getAttribute(attr));
		}
		return values;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see java.util.Map#entrySet()
	 */
	@Override
	public Set<java.util.Map.Entry<String, Object>> entrySet() {
		Set<Map.Entry<String, Object>> entries = new HashSet<Map.Entry<String, Object>>();
		Enumeration<?> attrNames = request.getAttributeNames();
		while (attrNames.hasMoreElements()) {
			final String attr = (String) attrNames.nextElement();
			Map.Entry<String, Object> entry = new Map.Entry<String, Object>() {
				@Override
				public String getKey() {
					return attr;
				}

				@Override
				public Object getValue() {
					return request.getAttribute(attr);
				}

				@Override
				public Object setValue(Object value) {
					Object oldValue = getValue();
					request.setAttribute(attr, value);
					return oldValue;
				}
			};
			entries.add(entry);
		}
		return entries;
	}

}

RequestAttrAdapterFactory.java

package com.sixd.sly.impl;

import org.apache.felix.scr.annotations.Component;
import org.apache.felix.scr.annotations.Properties;
import org.apache.felix.scr.annotations.Property;
import org.apache.felix.scr.annotations.Service;
import org.apache.sling.api.SlingHttpServletRequest;
import org.apache.sling.api.adapter.AdapterFactory;

import com.sixd.sly.RequestAttr;

/**
 * Allows for adapting sling requests into a map.
 * 
 * @author dklco
 */
@Component(metatype = false)
@Service
@Properties({
		@Property(name = "adaptables", value = "org.apache.sling.api.SlingHttpServletRequest"),
		@Property(name = "adapters", value = "com.sixd.sly.RequestAttr") })
public class RequestAttrAdapterFactory implements AdapterFactory {

	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * org.apache.sling.api.adapter.AdapterFactory#getAdapter(java.lang.Object,
	 * java.lang.Class)
	 */
	@Override
	public <AdapterType> AdapterType getAdapter(Object adaptable,
			Class<AdapterType> type) {
		if (adaptable instanceof SlingHttpServletRequest) {
			return type.cast(new RequestAttr(
					(SlingHttpServletRequest) adaptable));
		}
		return null;
	}
}