juneau-core/src/main/java/org/apache/juneau/BeanDictionaryMap.java

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package org.apache.juneau;

import java.lang.reflect.*;
import java.util.*;

import org.apache.juneau.annotation.*;

/**
 * Represents a map of dictionary type names to bean classes that make up a bean dictionary.
 * <p>
 * In general, this approach for defining dictionary names for classes is used when it's not possible
 * to use the {@link Bean#typeName()} annotation.
 * <p>
 * Subclasses must implement a public no-arg constructor so that it can be instantiated by the bean context code.
 */
@SuppressWarnings("rawtypes")
public class BeanDictionaryMap extends LinkedHashMap<String,Object> {
	private static final long serialVersionUID = 1L;

	/**
	 * Add a dictionary name mapping for the specified class.
	 *
	 * @param typeName The dictionary name of the class.
	 * @param c The class represented by the dictionary name.
	 * @return This object (for method chaining).
	 */
	protected BeanDictionaryMap addClass(String typeName, Class<?> c) {
		put(typeName, c);
		return this;
	}

	/**
	 * Add a dictionary name mapping for the specified map class with the specified key and value classes.
	 *
	 * @param typeName The dictionary name of the class.
	 * @param mapClass The map implementation class.
	 * @param keyClass The key class.
	 * @param valueClass The value class.
	 * @return This object (for method chaining).
	 */
	protected BeanDictionaryMap addMapClass(String typeName, Class<? extends Map> mapClass, Object keyClass, Object valueClass) {
		assertValidParameter(keyClass);
		assertValidParameter(valueClass);
		put(typeName, new Object[]{mapClass, keyClass, valueClass});
		return this;
	}

	/**
	 * Add a dictionary name mapping for the specified collection class with the specified entry class.
	 *
	 * @param typeName The dictionary name of the class.
	 * @param collectionClass The collection implementation class.
	 * @param entryClass The entry class.
	 * @return This object (for method chaining).
	 */
	protected BeanDictionaryMap addCollectionClass(String typeName, Class<? extends Collection> collectionClass, Object entryClass) {
		assertValidParameter(entryClass);
		put(typeName, new Object[]{collectionClass, entryClass});
		return this;
	}

	private void assertValidParameter(Object o) {
		if (o != null) {
			if (o instanceof Class)
				return;
			if (o.getClass().isArray()) {
				for (int i = 0; i < Array.getLength(o); i++)
					assertValidParameter(Array.get(o, i));
				return;
			}
		}
		throw new BeanRuntimeException("Invalid object type passed to BeanDictionaryMap: ''{0}''.  Only objects of type Class or Object[] containing Class or Object[] objects can be used.");
	}
}