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com.mjh.util
Class BeanMap  

java.lang.Object
  com.mjh.util.BeanMap

All Implemented Interfaces:

java.util.Map

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public class BeanMap

extends java.lang.Object

implements java.util.Map

BeanMap provides an adaptor for Java Beans to allow them to be treated as a java.util.Map.

BeanMap is pretty good at coercing string values into the appropriate primitive type for a bean setter method argument.

For example:

MyBean myBean = new MyBean();
BeanMap myMap = new BeamMap(myBean);
myMap.put("totalCount", "100");
Number value = (Number)myMap.get("totalCount");


The above code will call the setTotalCount() method on myBean with the string value of "100" coerced to the required integer argument. Then call the getTotalCount() method on myBean and convert the int return value to the Java primitive wrapper class.

The coercion makes BeanMap particularly useful to initialize beans from values stored in text files.

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Nested Class Summary
class	BeanMap.BeanMapEntry

 

Nested classes inherited from class java.util.Map

java.util.Map.Entry

 

Field Summary
private  java.lang.Object	bean
private  java.beans.BeanInfo	info
private static org.apache.log4j.Logger	log
private  java.util.Map	pdMap

 

Constructor Summary

BeanMap(java.lang.Object object)

 

Method Summary
void	clear()           Remove all entries from this Map (optional operation).
private  java.lang.Object	coerceValue(java.lang.Object value, java.lang.Class targetClazz)
boolean	containsKey(java.lang.Object key)           Returns true if this contains a mapping for the given key.
boolean	containsValue(java.lang.Object o)           Returns true if this contains at least one mapping with the given value.
java.util.Set	entrySet()           Returns a set view of the mappings in this Map.
boolean	equals(java.lang.Object o)           Compares the specified object with this map for equality.
java.lang.Object	get(java.lang.Object key)           Returns the value mapped by the given key.
java.util.Map	getAll()
private  java.beans.PropertyDescriptor	getPropertyDescriptor(java.lang.String key)
boolean	isEmpty()           Returns true if the map contains no mappings.
java.util.Set	keySet()           Returns a set view of the keys in this Map.
java.lang.Object	put(java.lang.Object key, java.lang.Object value)           Associates the given key to the given value (optional operation).
void	putAll(java.util.Map map)           Copies all entries of the given map to this one (optional operation).
java.lang.Object	remove(java.lang.Object key)           Removes the mapping for this key if present (optional operation).
int	size()           Returns the number of key-value mappings in the map.
java.util.Collection	values()           Returns a collection (or bag) view of the values in this Map.

 

Methods inherited from class java.lang.Object

clone, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

 

Methods inherited from interface java.util.Map

hashCode

 

Field Detail

log

private static final org.apache.log4j.Logger log

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bean

private java.lang.Object bean

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info

private java.beans.BeanInfo info

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pdMap

private java.util.Map pdMap

Constructor Detail

BeanMap

public BeanMap(java.lang.Object object)
        throws java.beans.IntrospectionException

Method Detail

getPropertyDescriptor

private java.beans.PropertyDescriptor getPropertyDescriptor(java.lang.String key)

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put

public java.lang.Object put(java.lang.Object key,
                            java.lang.Object value)

Description copied from interface: java.util.Map

Associates the given key to the given value (optional operation). If the map already contains the key, its value is replaced. Be aware that in a map that permits null values, a null return does not always imply that the mapping was created.

Specified by:

put in interface java.util.Map

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get

public java.lang.Object get(java.lang.Object key)

Description copied from interface: java.util.Map

Returns the value mapped by the given key. Returns null if there is no mapping. However, in Maps that accept null values, you must rely on containsKey to determine if a mapping exists.

Specified by:

get in interface java.util.Map

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containsKey

public boolean containsKey(java.lang.Object key)

Description copied from interface: java.util.Map

Returns true if this contains a mapping for the given key.

Specified by:

containsKey in interface java.util.Map

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containsValue

public boolean containsValue(java.lang.Object o)

Description copied from interface: java.util.Map

Returns true if this contains at least one mapping with the given value. In other words, returns true if a value v exists where (value == null ? v == null : value.equals(v)). This usually requires linear time.

Specified by:

containsValue in interface java.util.Map

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clear

public void clear()

Description copied from interface: java.util.Map

Remove all entries from this Map (optional operation).

Specified by:

clear in interface java.util.Map

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remove

public java.lang.Object remove(java.lang.Object key)

Description copied from interface: java.util.Map

Removes the mapping for this key if present (optional operation). If the key is not present, this returns null. Note that maps which permit null values may also return null if the key was removed.

Specified by:

remove in interface java.util.Map

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values

public java.util.Collection values()

Description copied from interface: java.util.Map

Returns a collection (or bag) view of the values in this Map. The collection is backed by the map, so that changes in one show up in the other. Modifications made while an iterator is in progress cause undefined behavior. If the collection supports removal, these methods remove the underlying mapping from the map: Iterator.remove, Collection.remove, removeAll, retainAll, and clear. Element addition, via add or addAll, is not supported via this collection.

Specified by:

values in interface java.util.Map

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keySet

public java.util.Set keySet()

Description copied from interface: java.util.Map

Returns a set view of the keys in this Map. The set is backed by the map, so that changes in one show up in the other. Modifications made while an iterator is in progress cause undefined behavior. If the set supports removal, these methods remove the underlying mapping from the map: Iterator.remove, Set.remove, removeAll, retainAll, and clear. Element addition, via add or addAll, is not supported via this set.

Specified by:

keySet in interface java.util.Map

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entrySet

public java.util.Set entrySet()

Description copied from interface: java.util.Map

Returns a set view of the mappings in this Map. Each element in the set is a Map.Entry. The set is backed by the map, so that changes in one show up in the other. Modifications made while an iterator is in progress cause undefined behavior. If the set supports removal, these methods remove the underlying mapping from the map: Iterator.remove, Set.remove, removeAll, retainAll, and clear. Element addition, via add or addAll, is not supported via this set.

Specified by:

entrySet in interface java.util.Map

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equals

public boolean equals(java.lang.Object o)

Description copied from interface: java.util.Map

Compares the specified object with this map for equality. Returns true if the other object is a Map with the same mappings, that is,
o instanceof Map && entrySet().equals(((Map) o).entrySet(); This allows comparison of maps, regardless of implementation.

Specified by:

equals in interface java.util.Map

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size

public int size()

Description copied from interface: java.util.Map

Returns the number of key-value mappings in the map. If there are more than Integer.MAX_VALUE mappings, return Integer.MAX_VALUE.

Specified by:

size in interface java.util.Map

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getAll

public java.util.Map getAll()

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putAll

public void putAll(java.util.Map map)

Description copied from interface: java.util.Map

Copies all entries of the given map to this one (optional operation). If the map already contains a key, its value is replaced.

Specified by:

putAll in interface java.util.Map

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isEmpty

public boolean isEmpty()

Description copied from interface: java.util.Map

Returns true if the map contains no mappings.

Specified by:

isEmpty in interface java.util.Map

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coerceValue

private java.lang.Object coerceValue(java.lang.Object value,
                                     java.lang.Class targetClazz)

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