beanwrapperimpl.java

spring的源代码

				}
				// Check to see if there is a custom editor,
				// which might give an indication on the desired target type.
				Class editorType = guessPropertyTypeFromEditors(propertyName);
				if (editorType != null) {
					return editorType;
				}
			}
		}
		catch (InvalidPropertyException ex) {
			// Consider as not determinable.
		}
		return null;
	}


	/**
	 * Get the last component of the path. Also works if not nested.
	 * @param bw BeanWrapper to work on
	 * @param nestedPath property path we know is nested
	 * @return last component of the path (the property on the target bean)
	 */
	private String getFinalPath(BeanWrapper bw, String nestedPath) {
		if (bw == this) {
			return nestedPath;
		}
		return nestedPath.substring(PropertyAccessorUtils.getLastNestedPropertySeparatorIndex(nestedPath) + 1);
	}

	/**
	 * Recursively navigate to return a BeanWrapper for the nested property path.
	 * @param propertyPath property property path, which may be nested
	 * @return a BeanWrapper for the target bean
	 */
	protected BeanWrapperImpl getBeanWrapperForPropertyPath(String propertyPath) throws BeansException {
		int pos = PropertyAccessorUtils.getFirstNestedPropertySeparatorIndex(propertyPath);
		// handle nested properties recursively
		if (pos > -1) {
			String nestedProperty = propertyPath.substring(0, pos);
			String nestedPath = propertyPath.substring(pos + 1);
			BeanWrapperImpl nestedBw = getNestedBeanWrapper(nestedProperty);
			return nestedBw.getBeanWrapperForPropertyPath(nestedPath);
		}
		else {
			return this;
		}
	}

	/**
	 * Retrieve a BeanWrapper for the given nested property.
	 * Create a new one if not found in the cache.
	 * <p>Note: Caching nested BeanWrappers is necessary now,
	 * to keep registered custom editors for nested properties.
	 * @param nestedProperty property to create the BeanWrapper for
	 * @return the BeanWrapper instance, either cached or newly created
	 */
	private BeanWrapperImpl getNestedBeanWrapper(String nestedProperty) throws BeansException {
		if (this.nestedBeanWrappers == null) {
			this.nestedBeanWrappers = new HashMap();
		}
		// Get Value of bean property-
		PropertyTokenHolder tokens = getPropertyNameTokens(nestedProperty);
		String canonicalName = tokens.canonicalName;
		Object propertyValue = getPropertyValue(tokens);
		if (propertyValue == null) {
			throw new NullValueInNestedPathException(getRootClass(), this.nestedPath + canonicalName);
		}

		// Lookup cached sub-BeanWrapper, create new one if not found.
		BeanWrapperImpl nestedBw = (BeanWrapperImpl) this.nestedBeanWrappers.get(canonicalName);
		if (nestedBw == null || nestedBw.getWrappedInstance() != propertyValue) {
			if (logger.isDebugEnabled()) {
				logger.debug("Creating new nested BeanWrapper for property '" + canonicalName + "'");
			}
			nestedBw = newNestedBeanWrapper(propertyValue, this.nestedPath + canonicalName + NESTED_PROPERTY_SEPARATOR);
			// Inherit all type-specific PropertyEditors.
			copyDefaultEditorsTo(nestedBw);
			copyCustomEditorsTo(nestedBw, canonicalName);
			this.nestedBeanWrappers.put(canonicalName, nestedBw);
		}
		else {
			if (logger.isDebugEnabled()) {
				logger.debug("Using cached nested BeanWrapper for property '" + canonicalName + "'");
			}
		}
		return nestedBw;
	}

	/**
	 * Create a new nested BeanWrapper instance.
	 * <p>Default implementation creates a BeanWrapperImpl instance.
	 * Can be overridden in subclasses to create a BeanWrapperImpl subclass.
	 * @param object object wrapped by this BeanWrapper
	 * @param nestedPath the nested path of the object
	 * @return the nested BeanWrapper instance
	 */
	protected BeanWrapperImpl newNestedBeanWrapper(Object object, String nestedPath) {
		return new BeanWrapperImpl(object, nestedPath, this);
	}

	/**
	 * Parse the given property name into the corresponding property name tokens.
	 * @param propertyName the property name to parse
	 * @return representation of the parsed property tokens
	 */
	private PropertyTokenHolder getPropertyNameTokens(String propertyName) {
		PropertyTokenHolder tokens = new PropertyTokenHolder();
		String actualName = null;
		List keys = new ArrayList(2);
		int searchIndex = 0;
		while (searchIndex != -1) {
			int keyStart = propertyName.indexOf(PROPERTY_KEY_PREFIX, searchIndex);
			searchIndex = -1;
			if (keyStart != -1) {
				int keyEnd = propertyName.indexOf(PROPERTY_KEY_SUFFIX, keyStart + PROPERTY_KEY_PREFIX.length());
				if (keyEnd != -1) {
					if (actualName == null) {
						actualName = propertyName.substring(0, keyStart);
					}
					String key = propertyName.substring(keyStart + PROPERTY_KEY_PREFIX.length(), keyEnd);
					if ((key.startsWith("'") && key.endsWith("'")) || (key.startsWith("\"") && key.endsWith("\""))) {
						key = key.substring(1, key.length() - 1);
					}
					keys.add(key);
					searchIndex = keyEnd + PROPERTY_KEY_SUFFIX.length();
				}
			}
		}
		tokens.actualName = (actualName != null ? actualName : propertyName);
		tokens.canonicalName = tokens.actualName;
		if (!keys.isEmpty()) {
			tokens.canonicalName +=
					PROPERTY_KEY_PREFIX +
					StringUtils.collectionToDelimitedString(keys, PROPERTY_KEY_SUFFIX + PROPERTY_KEY_PREFIX) +
					PROPERTY_KEY_SUFFIX;
			tokens.keys = StringUtils.toStringArray(keys);
		}
		return tokens;
	}


	//---------------------------------------------------------------------
	// Implementation of PropertyAccessor interface
	//---------------------------------------------------------------------

	public Object getPropertyValue(String propertyName) throws BeansException {
		BeanWrapperImpl nestedBw = getBeanWrapperForPropertyPath(propertyName);
		PropertyTokenHolder tokens = getPropertyNameTokens(getFinalPath(nestedBw, propertyName));
		return nestedBw.getPropertyValue(tokens);
	}

	private Object getPropertyValue(PropertyTokenHolder tokens) throws BeansException {
		String propertyName = tokens.canonicalName;
		String actualName = tokens.actualName;
		PropertyDescriptor pd = getPropertyDescriptorInternal(tokens.actualName);
		if (pd == null || pd.getReadMethod() == null) {
			throw new NotReadablePropertyException(getRootClass(), this.nestedPath + propertyName);
		}
		Method readMethod = pd.getReadMethod();
		if (logger.isDebugEnabled()) {
			logger.debug("About to invoke read method [" + readMethod + "] on object of class [" +
					this.object.getClass().getName() + "]");
		}
		try {
			if (!Modifier.isPublic(readMethod.getDeclaringClass().getModifiers())) {
				readMethod.setAccessible(true);
			}
			Object value = readMethod.invoke(this.object, (Object[]) null);
			if (tokens.keys != null) {
				// apply indexes and map keys
				for (int i = 0; i < tokens.keys.length; i++) {
					String key = tokens.keys[i];
					if (value == null) {
						throw new NullValueInNestedPathException(getRootClass(), this.nestedPath + propertyName,
								"Cannot access indexed value of property referenced in indexed " +
								"property path '" + propertyName + "': returned null");
					}
					else if (value.getClass().isArray()) {
						value = Array.get(value, Integer.parseInt(key));
					}
					else if (value instanceof List) {
						List list = (List) value;
						value = list.get(Integer.parseInt(key));
					}
					else if (value instanceof Set) {
						// apply index to Iterator in case of a Set
						Set set = (Set) value;
						int index = Integer.parseInt(key);
						if (index < 0 || index >= set.size()) {
							throw new InvalidPropertyException(getRootClass(), this.nestedPath + propertyName,
									"Cannot get element with index " + index + " from Set of size " +
									set.size() + ", accessed using property path '" + propertyName + "'");
						}
						Iterator it = set.iterator();
						for (int j = 0; it.hasNext(); j++) {
							Object elem = it.next();
							if (j == index) {
								value = elem;
								break;
							}
						}
					}
					else if (value instanceof Map) {
						Map map = (Map) value;
						value = map.get(key);
					}
					else {
						throw new InvalidPropertyException(getRootClass(), this.nestedPath + propertyName,
								"Property referenced in indexed property path '" + propertyName +
								"' is neither an array nor a List nor a Set nor a Map; returned value was [" + value + "]");
					}
				}
			}
			return value;
		}
		catch (InvocationTargetException ex) {
			throw new InvalidPropertyException(getRootClass(), this.nestedPath + propertyName,
					"Getter for property '" + actualName + "' threw exception", ex);
		}
		catch (IllegalAccessException ex) {
			throw new InvalidPropertyException(getRootClass(), this.nestedPath + propertyName,
					"Illegal attempt to get property '" + actualName + "' threw exception", ex);
		}
		catch (IndexOutOfBoundsException ex) {
			throw new InvalidPropertyException(getRootClass(), this.nestedPath + propertyName,
					"Index of out of bounds in property path '" + propertyName + "'", ex);
		}
		catch (NumberFormatException ex) {
			throw new InvalidPropertyException(getRootClass(), this.nestedPath + propertyName,
					"Invalid index in property path '" + propertyName + "'", ex);
		}
	}

	public void setPropertyValue(String propertyName, Object value) throws BeansException {
		BeanWrapperImpl nestedBw = null;
		try {
			nestedBw = getBeanWrapperForPropertyPath(propertyName);
		}
		catch (NotReadablePropertyException ex) {
			throw new NotWritablePropertyException(getRootClass(), this.nestedPath + propertyName,
					"Nested property in path '" + propertyName + "' does not exist", ex);
		}
		PropertyTokenHolder tokens = getPropertyNameTokens(getFinalPath(nestedBw, propertyName));
		nestedBw.setPropertyValue(tokens, value);
	}

	private void setPropertyValue(PropertyTokenHolder tokens, Object newValue) throws BeansException {
		String propertyName = tokens.canonicalName;

		if (tokens.keys != null) {
			// Apply indexes and map keys: fetch value for all keys but the last one.
			PropertyTokenHolder getterTokens = new PropertyTokenHolder();
			getterTokens.canonicalName = tokens.canonicalName;
			getterTokens.actualName = tokens.actualName;
			getterTokens.keys = new String[tokens.keys.length - 1];
			System.arraycopy(tokens.keys, 0, getterTokens.keys, 0, tokens.keys.length - 1);
			Object propValue = null;
			try {
				propValue = getPropertyValue(getterTokens);
			}
			catch (NotReadablePropertyException ex) {
				throw new NotWritablePropertyException(getRootClass(), this.nestedPath + propertyName,
						"Cannot access indexed value in property referenced " +
						"in indexed property path '" + propertyName + "'", ex);
			}
			// Set value for last key.
			String key = tokens.keys[tokens.keys.length - 1];
			if (propValue == null) {
				throw new NullValueInNestedPathException(getRootClass(), this.nestedPath + propertyName,
						"Cannot access indexed value in property referenced " +
						"in indexed property path '" + propertyName + "': returned null");
			}
			else if (propValue.getClass().isArray()) {
				Class requiredType = propValue.getClass().getComponentType();
				int arrayIndex = Integer.parseInt(key);
				Object oldValue = null;
				try {
					if (this.extractOldValueForEditor) {
						oldValue = Array.get(propValue, arrayIndex);
					}
					Object convertedValue =
							doTypeConversionIfNecessary(propertyName, propertyName, oldValue, newValue, requiredType);
					Array.set(propValue, Integer.parseInt(key), convertedValue);
				}
				catch (IllegalArgumentException ex) {
					PropertyChangeEvent pce =
							new PropertyChangeEvent(this.rootObject, this.nestedPath + propertyName, oldValue, newValue);
					throw new TypeMismatchException(pce, requiredType, ex);
				}
				catch (IndexOutOfBoundsException ex) {
					throw new InvalidPropertyException(getRootClass(), this.nestedPath + propertyName,
							"Invalid array index in property path '" + propertyName + "'", ex);
				}
			}
			else if (propValue instanceof List) {
				List list = (List) propValue;
				int index = Integer.parseInt(key);
				Object oldValue = null;
				if (this.extractOldValueForEditor && index < list.size()) {
					oldValue = list.get(index);
				}
				Object convertedValue =
						doTypeConversionIfNecessary(propertyName, propertyName, oldValue, newValue, null);
				if (index < list.size()) {
					list.set(index, convertedValue);
				}
				else if (index >= list.size()) {
					for (int i = list.size(); i < index; i++) {
						try {
							list.add(null);
						}
						catch (NullPointerException ex) {
							throw new InvalidPropertyException(getRootClass(), this.nestedPath + propertyName,
									"Cannot set element with index " + index + " in List of size " +
									list.size() + ", accessed using property path '" + propertyName +
									"': List does not support filling up gaps with null elements");
						}
					}
					list.add(convertedValue);
				}
			}
			else if (propValue instanceof Map) {
				Map map = (Map) propValue;
				Object oldValue = null;
				if (this.extractOldValueForEditor) {
					oldValue = map.get(key);
				}
				Object convertedValue =