propertyutilsbean.java

这是一个有关common beanutils 的源码

     * @exception IllegalArgumentException if <code>bean</code> or
     *  <code>name</code> is null
     * @exception IllegalArgumentException if the property name
     *  is nested or indexed
     * @exception InvocationTargetException if the property accessor method
     *  throws an exception
     * @exception NoSuchMethodException if an accessor method for this
     *  propety cannot be found
     */
    public Object getSimpleProperty(Object bean, String name)
            throws IllegalAccessException, InvocationTargetException,
            NoSuchMethodException {

        if (bean == null) {
            throw new IllegalArgumentException("No bean specified");
        }
        if (name == null) {
            throw new IllegalArgumentException("No name specified for bean class '" +
                    bean.getClass() + "'");
        }

        // Validate the syntax of the property name
        if (resolver.hasNested(name)) {
            throw new IllegalArgumentException
                    ("Nested property names are not allowed: Property '" +
                    name + "' on bean class '" + bean.getClass() + "'");
        } else if (resolver.isIndexed(name)) {
            throw new IllegalArgumentException
                    ("Indexed property names are not allowed: Property '" +
                    name + "' on bean class '" + bean.getClass() + "'");
        } else if (resolver.isMapped(name)) {
            throw new IllegalArgumentException
                    ("Mapped property names are not allowed: Property '" +
                    name + "' on bean class '" + bean.getClass() + "'");
        }

        // Handle DynaBean instances specially
        if (bean instanceof DynaBean) {
            DynaProperty descriptor =
                    ((DynaBean) bean).getDynaClass().getDynaProperty(name);
            if (descriptor == null) {
                throw new NoSuchMethodException("Unknown property '" +
                        name + "' on dynaclass '" + 
                        ((DynaBean) bean).getDynaClass() + "'" );
            }
            return (((DynaBean) bean).get(name));
        }

        // Retrieve the property getter method for the specified property
        PropertyDescriptor descriptor =
                getPropertyDescriptor(bean, name);
        if (descriptor == null) {
            throw new NoSuchMethodException("Unknown property '" +
                    name + "' on class '" + bean.getClass() + "'" );
        }
        Method readMethod = getReadMethod(bean.getClass(), descriptor);
        if (readMethod == null) {
            throw new NoSuchMethodException("Property '" + name +
                    "' has no getter method in class '" + bean.getClass() + "'");
        }

        // Call the property getter and return the value
        Object value = invokeMethod(readMethod, bean, EMPTY_OBJECT_ARRAY);
        return (value);

    }


    /**
     * <p>Return an accessible property setter method for this property,
     * if there is one; otherwise return <code>null</code>.</p>
     *
     * <p><strong>FIXME</strong> - Does not work with DynaBeans.</p>
     *
     * @param descriptor Property descriptor to return a setter for
     * @return The write method
     */
    public Method getWriteMethod(PropertyDescriptor descriptor) {

        return (MethodUtils.getAccessibleMethod(descriptor.getWriteMethod()));

    }


    /**
     * <p>Return an accessible property setter method for this property,
     * if there is one; otherwise return <code>null</code>.</p>
     *
     * <p><strong>FIXME</strong> - Does not work with DynaBeans.</p>
     *
     * @param clazz The class of the read method will be invoked on
     * @param descriptor Property descriptor to return a setter for
     * @return The write method
     */
    Method getWriteMethod(Class clazz, PropertyDescriptor descriptor) {
        return (MethodUtils.getAccessibleMethod(clazz, descriptor.getWriteMethod()));
    }


    /**
     * <p>Return <code>true</code> if the specified property name identifies
     * a readable property on the specified bean; otherwise, return
     * <code>false</code>.
     *
     * @param bean Bean to be examined (may be a {@link DynaBean}
     * @param name Property name to be evaluated
     * @return <code>true</code> if the property is readable,
     * otherwise <code>false</code>
     *
     * @exception IllegalArgumentException if <code>bean</code>
     *  or <code>name</code> is <code>null</code>
     *
     * @since BeanUtils 1.6
     */
    public boolean isReadable(Object bean, String name) {

        // Validate method parameters
        if (bean == null) {
            throw new IllegalArgumentException("No bean specified");
        }
        if (name == null) {
            throw new IllegalArgumentException("No name specified for bean class '" +
                    bean.getClass() + "'");
        }

        // Resolve nested references
        while (resolver.hasNested(name)) {
            String next = resolver.next(name);
            Object nestedBean = null; 
            try {
                nestedBean = getProperty(bean, next);
            } catch (IllegalAccessException e) {
                return false;
            } catch (InvocationTargetException e) {
                return false;
            } catch (NoSuchMethodException e) {
                return false;
            }
            if (nestedBean == null) {
                throw new NestedNullException
                        ("Null property value for '" + next +
                        "' on bean class '" + bean.getClass() + "'");
            }
            bean = nestedBean;
            name = resolver.remove(name);
        }

        // Remove any subscript from the final name value
        name = resolver.getProperty(name);

        // Treat WrapDynaBean as special case - may be a write-only property
        // (see Jira issue# BEANUTILS-61)
        if (bean instanceof WrapDynaBean) {
            bean = ((WrapDynaBean)bean).getInstance();
        }

        // Return the requested result
        if (bean instanceof DynaBean) {
            // All DynaBean properties are readable
            return (((DynaBean) bean).getDynaClass().getDynaProperty(name) != null);
        } else {
            try {
                PropertyDescriptor desc =
                    getPropertyDescriptor(bean, name);
                if (desc != null) {
                    Method readMethod = getReadMethod(bean.getClass(), desc);
                    if (readMethod == null) {
                        if (desc instanceof IndexedPropertyDescriptor) {
                            readMethod = ((IndexedPropertyDescriptor) desc).getIndexedReadMethod();
                        } else if (desc instanceof MappedPropertyDescriptor) {
                            readMethod = ((MappedPropertyDescriptor) desc).getMappedReadMethod();
                        }
                        readMethod = MethodUtils.getAccessibleMethod(bean.getClass(), readMethod);
                    }
                    return (readMethod != null);
                } else {
                    return (false);
                }
            } catch (IllegalAccessException e) {
                return (false);
            } catch (InvocationTargetException e) {
                return (false);
            } catch (NoSuchMethodException e) {
                return (false);
            }
        }

    }


    /**
     * <p>Return <code>true</code> if the specified property name identifies
     * a writeable property on the specified bean; otherwise, return
     * <code>false</code>.
     *
     * @param bean Bean to be examined (may be a {@link DynaBean}
     * @param name Property name to be evaluated
     * @return <code>true</code> if the property is writeable,
     * otherwise <code>false</code>
     *
     * @exception IllegalArgumentException if <code>bean</code>
     *  or <code>name</code> is <code>null</code>
     *
     * @since BeanUtils 1.6
     */
    public boolean isWriteable(Object bean, String name) {

        // Validate method parameters
        if (bean == null) {
            throw new IllegalArgumentException("No bean specified");
        }
        if (name == null) {
            throw new IllegalArgumentException("No name specified for bean class '" +
                    bean.getClass() + "'");
        }

        // Resolve nested references
        while (resolver.hasNested(name)) {
            String next = resolver.next(name);
            Object nestedBean = null; 
            try {
                nestedBean = getProperty(bean, next);
            } catch (IllegalAccessException e) {
                return false;
            } catch (InvocationTargetException e) {
                return false;
            } catch (NoSuchMethodException e) {
                return false;
            }
            if (nestedBean == null) {
                throw new NestedNullException
                        ("Null property value for '" + next +
                        "' on bean class '" + bean.getClass() + "'");
            }
            bean = nestedBean;
            name = resolver.remove(name);
        }

        // Remove any subscript from the final name value
        name = resolver.getProperty(name);

        // Treat WrapDynaBean as special case - may be a read-only property
        // (see Jira issue# BEANUTILS-61)
        if (bean instanceof WrapDynaBean) {
            bean = ((WrapDynaBean)bean).getInstance();
        }

        // Return the requested result
        if (bean instanceof DynaBean) {
            // All DynaBean properties are writeable
            return (((DynaBean) bean).getDynaClass().getDynaProperty(name) != null);
        } else {
            try {
                PropertyDescriptor desc =
                    getPropertyDescriptor(bean, name);
                if (desc != null) {
                    Method writeMethod = getWriteMethod(bean.getClass(), desc);
                    if (writeMethod == null) {
                        if (desc instanceof IndexedPropertyDescriptor) {
                            writeMethod = ((IndexedPropertyDescriptor) desc).getIndexedWriteMethod();
                        } else if (desc instanceof MappedPropertyDescriptor) {
                            writeMethod = ((MappedPropertyDescriptor) desc).getMappedWriteMethod();
                        }
                        writeMethod = MethodUtils.getAccessibleMethod(bean.getClass(), writeMethod);
                    }
                    return (writeMethod != null);
                } else {
                    return (false);
                }
            } catch (IllegalAccessException e) {
                return (false);
            } catch (InvocationTargetException e) {
                return (false);
            } catch (NoSuchMethodException e) {
                return (false);
            }
        }

    }


    /**
     * Set the value of the specified indexed property of the specified
     * bean, with no type conversions.  The zero-relative index of the
     * required value must be included (in square brackets) as a suffix to
     * the property name, or <code>IllegalArgumentException</code> will be
     * thrown.  In addition to supporting the JavaBeans specification, this
     * method has been extended to support <code>List</code> objects as well.
     *
     * @param bean Bean whose property is to be modified
     * @param name <code>propertyname[index]</code> of the property value
     *  to be modified
     * @param value Value to which the specified property element
     *  should be set
     *
     * @exception IndexOutOfBoundsException if the specified index
     *  is outside the valid range for the underlying property
     * @exception IllegalAccessException if the caller does not have
     *  access to the property accessor method
     * @exception IllegalArgumentException if <code>bean</code> or
     *  <code>name</code> is null
     * @exception InvocationTargetException if the property accessor method
     *  throws an exception
     * @exception NoSuchMethodException if an accessor method for this
     *  propety cannot be found
     */
    public void setIndexedProperty(Object bean, String name,
                                          Object value)
            throws IllegalAccessException, InvocationTargetException,
            NoSuchMethodException {

        if (bean == null) {
            throw new IllegalArgumentException("No bean specified");
        }
        if