com.google.gwt.gwtpages.client.page.PageAttributes.java Source code

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Here is the source code for com.google.gwt.gwtpages.client.page.PageAttributes.java

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package com.google.gwt.gwtpages.client.page;

import java.util.HashMap;

import com.google.gwt.gwtpages.client.page.loader.PageLoader;

/**
 * Meta data that can be used to provide additional information related to a
 * page that is actually decoupled from the page. This is information which is
 * provided by the {@link PageLoader}.
 * 
 * It is meant to be context sensitive. All information referenced with the meta
 * data is keyed by the object class and can then by retrieved using the object
 * class as a key.
 * 
 * @author Joe Hudson
 * 
 */
public class PageAttributes {

    private HashMap<Class<?>, Object> impls = new HashMap<Class<?>, Object>();
    private HashMap<Object, Object> data = new HashMap<Object, Object>();

    /**
     * Add a data attribute
     * 
     * @param <R>
     *            the class type
     * @param context
     *            the class (used to key the data)
     * @param data
     *            the data class implementation
     * @return this for chaining
     */
    public <R> PageAttributes put(Class<R> context, R data) {
        impls.put(context, data);
        return this;
    }

    /**
     * Add a data attribute
     * 
     * @param <R>
     *            the class type
     * @param context
     *            the class (used to key the data)
     * @param data
     *            the data class implementation
     * @return this for chaining
     */
    public <R> PageAttributes put(Object key, Object data) {
        this.data.put(key, data);
        return this;
    }

    /**
     * Return the keyed data using the class as the token key
     * 
     * @param <R>
     *            the class type
     * @param context
     *            the data class
     * @return the data instance
     */
    @SuppressWarnings("unchecked")
    public <R> R get(Class<R> context) {
        return (R) impls.get(context);
    }

    public Object get(Object key) {
        return data.get(key);
    }

    public HashMap<Object, Object> getData() {
        return data;
    }

    public PageAttributes copy() {
        PageAttributes rtn = new PageAttributes();
        rtn.impls.putAll(impls);
        rtn.data.putAll(data);
        return rtn;
    }
}