runtimeconfigurable.java

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     *
     * @param child The child element wrapper to add to this one.
     *              Must not be <code>null</code>.
     */
    public synchronized void addChild(RuntimeConfigurable child) {
        children = (children == null) ? new ArrayList() : children;
        children.add(child);
    }

    /**
     * Returns the child wrapper at the specified position within the list.
     *
     * @param index The index of the child to return.
     *
     * @return The child wrapper at position <code>index</code> within the
     *         list.
     */
    synchronized RuntimeConfigurable getChild(int index) {
        return (RuntimeConfigurable) children.get(index);
    }

    /**
     * Returns an enumeration of all child wrappers.
     * @return an enumeration of the child wrappers.
     * @since Ant 1.6
     */
    public synchronized Enumeration getChildren() {
        return (children == null) ? new CollectionUtils.EmptyEnumeration()
            : Collections.enumeration(children);
    }

    /**
     * Adds characters from #PCDATA areas to the wrapped element.
     *
     * @param data Text to add to the wrapped element.
     *        Should not be <code>null</code>.
     */
    public synchronized void addText(String data) {
        if (data.length() == 0) {
            return;
        }
        characters = (characters == null)
            ? new StringBuffer(data) : characters.append(data);
    }

    /**
     * Adds characters from #PCDATA areas to the wrapped element.
     *
     * @param buf A character array of the text within the element.
     *            Must not be <code>null</code>.
     * @param start The start element in the array.
     * @param count The number of characters to read from the array.
     *
     */
    public synchronized void addText(char[] buf, int start, int count) {
        if (count == 0) {
            return;
        }
        characters = ((characters == null)
            ? new StringBuffer(count) : characters).append(buf, start, count);
    }

    /**
     * Get the text content of this element. Various text chunks are
     * concatenated, there is no way ( currently ) of keeping track of
     * multiple fragments.
     *
     * @return the text content of this element.
     * @since Ant 1.6
     */
    public synchronized StringBuffer getText() {
        return (characters == null) ? new StringBuffer(0) : characters;
    }

    /**
     * Set the element tag.
     * @param elementTag The tag name generating this element.
     */
    public synchronized void setElementTag(String elementTag) {
        this.elementTag = elementTag;
    }

    /**
     * Returns the tag name of the wrapped element.
     *
     * @return The tag name of the wrapped element. This is unlikely
     *         to be <code>null</code>, but may be.
     */
    public synchronized String getElementTag() {
        return elementTag;
    }

    /**
     * Configures the wrapped element and all its children.
     * The attributes and text for the wrapped element are configured,
     * and then each child is configured and added. Each time the
     * wrapper is configured, the attributes and text for it are
     * reset.
     *
     * If the element has an <code>id</code> attribute, a reference
     * is added to the project as well.
     *
     * @param p The project containing the wrapped element.
     *          Must not be <code>null</code>.
     *
     * @exception BuildException if the configuration fails, for instance due
     *            to invalid attributes or children, or text being added to
     *            an element which doesn't accept it.
     */
    public void maybeConfigure(Project p) throws BuildException {
        maybeConfigure(p, true);
    }

    /**
     * Configures the wrapped element.  The attributes and text for
     * the wrapped element are configured.  Each time the wrapper is
     * configured, the attributes and text for it are reset.
     *
     * If the element has an <code>id</code> attribute, a reference
     * is added to the project as well.
     *
     * @param p The project containing the wrapped element.
     *          Must not be <code>null</code>.
     *
     * @param configureChildren ignored.

     *
     * @exception BuildException if the configuration fails, for instance due
     *            to invalid attributes , or text being added to
     *            an element which doesn't accept it.
     */
    public synchronized void maybeConfigure(Project p, boolean configureChildren)
        throws BuildException {

        if (proxyConfigured) {
            return;
        }

        // Configure the object
        Object target = (wrappedObject instanceof TypeAdapter)
            ? ((TypeAdapter) wrappedObject).getProxy() : wrappedObject;

        IntrospectionHelper ih =
            IntrospectionHelper.getHelper(p, target.getClass());

        if (attributeNames != null) {
            for (int i = 0; i < attributeNames.size(); i++) {
                String name = (String) attributeNames.get(i);
                String value = (String) attributeMap.get(name);

                // reflect these into the target
                value = p.replaceProperties(value);
                try {
                    ih.setAttribute(p, target, name, value);
                } catch (UnsupportedAttributeException be) {
                    // id attribute must be set externally
                    if (name.equals("id")) {
                        // Do nothing
                    } else  if (getElementTag() == null) {
                        throw be;
                    } else {
                        throw new BuildException(
                            getElementTag() +  " doesn't support the \""
                            + be.getAttribute() + "\" attribute", be);
                    }
                } catch (BuildException be) {
                    if (name.equals("id")) {
                        // Assume that this is an not supported attribute type
                        // thrown for example by a dymanic attribute task
                        // Do nothing
                    } else {
                        throw be;
                    }
                }
            }
        }

        if (characters != null) {
            ProjectHelper.addText(p, wrappedObject, characters.substring(0));
        }

        if (id != null) {
            p.addReference(id, wrappedObject);
        }
        proxyConfigured = true;
    }

    /**
     * Reconfigure the element, even if it has already been configured.
     *
     * @param p the project instance for this configuration.
     */
    public void reconfigure(Project p) {
        proxyConfigured = false;
        maybeConfigure(p);
    }


    /**
     * Apply presets, attributes and text are set if not currently set.
     * Nested elements are prepended.
     *
     * @param r a <code>RuntimeConfigurable</code> value.
     */
    public void applyPreSet(RuntimeConfigurable r) {
        // Attributes
        if (r.attributeMap != null) {
            for (Iterator i = r.attributeMap.keySet().iterator(); i.hasNext();) {
                String name = (String) i.next();
                if (attributeMap == null || attributeMap.get(name) == null) {
                    setAttribute(name, (String) r.attributeMap.get(name));
                }
            }
        }
        // poly type

        polyType = (polyType == null) ? r.polyType : polyType;

        // Children (this is a shadow of UnknownElement#children)
        if (r.children != null) {
            List newChildren = new ArrayList();
            newChildren.addAll(r.children);
            if (children != null) {
                newChildren.addAll(children);
            }
            children = newChildren;
        }

        // Text
        if (r.characters != null) {
            if (characters == null
                || characters.toString().trim().length() == 0) {
                characters = new StringBuffer(r.characters.toString());
            }
        }
    }
}