dynaactionform.java.svn-base

MVC开源框架

     * @throws NullPointerException     if the type specified for the property
     *                                  is invalid
     * @throws ClassCastException       if the property is not a String.
     * @since Struts 1.2
     */
    public String getString(String name) {
        return (String) this.get(name);
    }

    /**
     * <p>Return the value of a <code>String[]</code> property with the
     * specified name. This is equivalent to calling <code>(String[])
     * dynaForm.get(name)</code>.</p>
     *
     * @param name Name of the property whose value is to be retrieved.
     * @return The value of a <code>String[]</code> property with the
     *         specified name.
     * @throws IllegalArgumentException if there is no property of the
     *                                  specified name
     * @throws NullPointerException     if the type specified for the property
     *                                  is invalid
     * @throws ClassCastException       if the property is not a String[].
     * @since Struts 1.2
     */
    public String[] getStrings(String name) {
        return (String[]) this.get(name);
    }

    /**
     * <p>Return the <code>DynaClass</code> instance that describes the set of
     * properties available for this <code>DynaBean</code>.</p>
     *
     * @return The <code>DynaClass</code> instance that describes the set of
     *         properties available for this <code>DynaBean</code>.
     */
    public DynaClass getDynaClass() {
        return (this.dynaClass);
    }

    /**
     * <p>Returns the <code>Map</code> containing the property values. This is
     * done mostly to facilitate accessing the <code>DynaActionForm</code>
     * through JavaBeans accessors, in order to use the JavaServer Pages
     * Standard Tag Library (JSTL).</p>
     *
     * <p>For instance, the normal JSTL EL syntax for accessing an
     * <code>ActionForm</code> would be something like this:
     * <pre>
     *  ${formbean.prop}</pre>
     * The JSTL EL syntax for accessing a <code>DynaActionForm</code> looks
     * something like this (because of the presence of this
     * <code>getMap()</code> method):
     * <pre>
     *  ${dynabean.map.prop}</pre>
     * </p>
     *
     * @return The <code>Map</code> containing the property values.
     */
    public Map getMap() {
        return (dynaValues);
    }

    /**
     * <p>Remove any existing value for the specified key on the specified
     * mapped property.</p>
     *
     * @param name Name of the property for which a value is to be removed
     * @param key  Key of the value to be removed
     * @throws NullPointerException     if there is no property of the
     *                                  specified name
     * @throws IllegalArgumentException if there is no mapped property of the
     *                                  specified name
     */
    public void remove(String name, String key) {
        Object value = dynaValues.get(name);

        if (value == null) {
            throw new NullPointerException("No mapped value for '" + name + "("
                + key + ")'");
        } else if (value instanceof Map) {
            ((Map) value).remove(key);
        } else {
            throw new IllegalArgumentException("Non-mapped property for '"
                + name + "(" + key + ")'");
        }
    }

    /**
     * <p>Set the value of a simple property with the specified name.</p>
     *
     * @param name  Name of the property whose value is to be set
     * @param value Value to which this property is to be set
     * @throws ConversionException      if the specified value cannot be
     *                                  converted to the type required for
     *                                  this property
     * @throws IllegalArgumentException if there is no property of the
     *                                  specified name
     * @throws NullPointerException     if the type specified for the property
     *                                  is invalid
     * @throws NullPointerException     if an attempt is made to set a
     *                                  primitive property to null
     */
    public void set(String name, Object value) {
        DynaProperty descriptor = getDynaProperty(name);

        if (descriptor.getType() == null) {
            throw new NullPointerException("The type for property " + name
                + " is invalid");
        }

        if (value == null) {
            if (descriptor.getType().isPrimitive()) {
                throw new NullPointerException("Primitive value for '" + name
                    + "'");
            }
        } else if (!isDynaAssignable(descriptor.getType(), value.getClass())) {
            throw new ConversionException("Cannot assign value of type '"
                + value.getClass().getName() + "' to property '" + name
                + "' of type '" + descriptor.getType().getName() + "'");
        }

        dynaValues.put(name, value);
    }

    /**
     * <p>Set the value of an indexed property with the specified name.</p>
     *
     * @param name  Name of the property whose value is to be set
     * @param index Index of the property to be set
     * @param value Value to which this property is to be set
     * @throws ConversionException       if the specified value cannot be
     *                                   converted to the type required for
     *                                   this property
     * @throws NullPointerException      if there is no property of the
     *                                   specified name
     * @throws IllegalArgumentException  if the specified property exists, but
     *                                   is not indexed
     * @throws IndexOutOfBoundsException if the specified index is outside the
     *                                   range of the underlying property
     */
    public void set(String name, int index, Object value) {
        Object prop = dynaValues.get(name);

        if (prop == null) {
            throw new NullPointerException("No indexed value for '" + name
                + "[" + index + "]'");
        } else if (prop.getClass().isArray()) {
            Array.set(prop, index, value);
        } else if (prop instanceof List) {
            try {
                ((List) prop).set(index, value);
            } catch (ClassCastException e) {
                throw new ConversionException(e.getMessage());
            }
        } else {
            throw new IllegalArgumentException("Non-indexed property for '"
                + name + "[" + index + "]'");
        }
    }

    /**
     * <p>Set the value of a mapped property with the specified name.</p>
     *
     * @param name  Name of the property whose value is to be set
     * @param key   Key of the property to be set
     * @param value Value to which this property is to be set
     * @throws NullPointerException     if there is no property of the
     *                                  specified name
     * @throws IllegalArgumentException if the specified property exists, but
     *                                  is not mapped
     */
    public void set(String name, String key, Object value) {
        Object prop = dynaValues.get(name);

        if (prop == null) {
            throw new NullPointerException("No mapped value for '" + name + "("
                + key + ")'");
        } else if (prop instanceof Map) {
            ((Map) prop).put(key, value);
        } else {
            throw new IllegalArgumentException("Non-mapped property for '"
                + name + "(" + key + ")'");
        }
    }

    // --------------------------------------------------------- Public Methods

    /**
     * <p>Render a String representation of this object.</p>
     *
     * @return A string representation of this object.
     */
    public String toString() {
        StringBuffer sb = new StringBuffer("DynaActionForm[dynaClass=");
        DynaClass dynaClass = getDynaClass();

        if (dynaClass == null) {
            return sb.append("null]").toString();
        }

        sb.append(dynaClass.getName());

        DynaProperty[] props = dynaClass.getDynaProperties();

        if (props == null) {
            props = new DynaProperty[0];
        }

        for (int i = 0; i < props.length; i++) {
            sb.append(',');
            sb.append(props[i].getName());
            sb.append('=');

            Object value = get(props[i].getName());

            if (value == null) {
                sb.append("<NULL>");
            } else if (value.getClass().isArray()) {
                int n = Array.getLength(value);

                sb.append("{");

                for (int j = 0; j < n; j++) {
                    if (j > 0) {
                        sb.append(',');
                    }

                    sb.append(Array.get(value, j));
                }

                sb.append("}");
            } else if (value instanceof List) {
                int n = ((List) value).size();

                sb.append("{");

                for (int j = 0; j < n; j++) {
                    if (j > 0) {
                        sb.append(',');
                    }

                    sb.append(((List) value).get(j));
                }

                sb.append("}");
            } else if (value instanceof Map) {
                int n = 0;
                Iterator keys = ((Map) value).keySet().iterator();

                sb.append("{");

                while (keys.hasNext()) {
                    if (n > 0) {
                        sb.append(',');
                    }

                    n++;

                    Object key = keys.next();

                    sb.append(key);
                    sb.append('=');
                    sb.append(((Map) value).get(key));
                }

                sb.append("}");
            } else {
                sb.append(value);
            }
        }

        sb.append("]");

        return (sb.toString());
    }

    // -------------------------------------------------------- Package Methods

    /**
     * <p>Set the <code>DynaActionFormClass</code> instance with which we are
     * associated.</p>
     *
     * @param dynaClass The DynaActionFormClass instance for this bean
     */
    void setDynaActionFormClass(DynaActionFormClass dynaClass) {
        this.dynaClass = dynaClass;
    }

    // ------------------------------------------------------ Protected Methods

    /**
     * <p>Return the property descriptor for the specified property name.</p>
     *
     * @param name Name of the property for which to retrieve the descriptor
     * @return The property descriptor for the specified property name.
     * @throws IllegalArgumentException if this is not a valid property name
     *                                  for our DynaClass
     */
    protected DynaProperty getDynaProperty(String name) {
        DynaProperty descriptor = getDynaClass().getDynaProperty(name);

        if (descriptor == null) {
            throw new IllegalArgumentException("Invalid property name '" + name
                + "'");
        }

        return (descriptor);
    }

    /**
     * <p>Indicates if an object of the source class is assignable to the
     * destination class.</p>
     *
     * @param dest   Destination class
     * @param source Source class
     * @return <code>true</code> if the source is assignable to the
     *         destination; <code>false</code> otherwise.
     */
    protected boolean isDynaAssignable(Class dest, Class source) {
        if (dest.isAssignableFrom(source)
            || ((dest == Boolean.TYPE) && (source == Boolean.class))
            || ((dest == Byte.TYPE) && (source == Byte.class))
            || ((dest == Character.TYPE) && (source == Character.class))
            || ((dest == Double.TYPE) && (source == Double.class))
            || ((dest == Float.TYPE) && (source == Float.class))
            || ((dest == Integer.TYPE) && (source == Integer.class))
            || ((dest == Long.TYPE) && (source == Long.class))
            || ((dest == Short.TYPE) && (source == Short.class))) {
            return (true);
        } else {
            return (false);
        }
    }
}