xfaform.java

iText是一个能够快速产生PDF文件的java类库。iText的java类对于那些要产生包含文本

    /**
     * A structure to store each part of a SOM name and link it to the next part
     * beginning from the lower hierarchie.
     */
    public static class InverseStore {
        protected ArrayList part = new ArrayList();
        protected ArrayList follow = new ArrayList();
        
        /**
         * Gets the full name by traversing the hiearchie using only the
         * index 0.
         * @return the full name
         */
        public String getDefaultName() {
            InverseStore store = this;
            while (true) {
                Object obj = store.follow.get(0);
                if (obj instanceof String)
                    return (String)obj;
                store = (InverseStore)obj;
            }
        }
        
        /**
         * Search the current node for a similar name. A similar name starts
         * with the same name but has a differnt index. For example, "detail[3]" 
         * is similar to "detail[9]". The main use is to discard names that
         * correspond to out of bounds records.
         * @param name the name to search
         * @return <CODE>true</CODE> if a similitude was found
         */
        public boolean isSimilar(String name) {
            int idx = name.indexOf('[');
            name = name.substring(0, idx + 1);
            for (int k = 0; k < part.size(); ++k) {
                if (((String)part.get(k)).startsWith(name))
                    return true;
            }
            return false;
        }
    }

    /**
     * Another stack implementation. The main use is to facilitate
     * the porting to other languages.
     */
    public static class Stack2 extends ArrayList {
        private static final long serialVersionUID = -7451476576174095212L;

		/**
         * Looks at the object at the top of this stack without removing it from the stack.
         * @return the object at the top of this stack
         */
        public Object peek() {
            if (size() == 0)
                throw new EmptyStackException();
            return get(size() - 1);
        }
        
        /**
         * Removes the object at the top of this stack and returns that object as the value of this function.
         * @return the object at the top of this stack 
         */
        public Object pop() {
            if (size() == 0)
                throw new EmptyStackException();
            Object ret = get(size() - 1);
            remove(size() - 1);
            return ret;
        }
        
        /**
         * Pushes an item onto the top of this stack.
         * @param item the item to be pushed onto this stack
         * @return the <CODE>item</CODE> argument
         */
        public Object push(Object item) {
            add(item);
            return item;
        }
        
        /**
         * Tests if this stack is empty.
         * @return <CODE>true</CODE> if and only if this stack contains no items; <CODE>false</CODE> otherwise
         */
        public boolean empty() {
            return size() == 0;
        }
    }
    
    /**
     * A class for some basic SOM processing.
     */
    public static class Xml2Som {
        /**
         * The order the names appear in the XML, depth first.
         */
        protected ArrayList order;
        /**
         * The mapping of full names to nodes.
         */
        protected HashMap name2Node;
        /**
         * The data to do a search from the bottom hierarchie.
         */
        protected HashMap inverseSearch;
        /**
         * A stack to be used when parsing.
         */
        protected Stack2 stack;
        /**
         * A temporary store for the repetition count.
         */
        protected int anform;

        /**
         * Escapes a SOM string fragment replacing "." with "\.".
         * @param s the unescaped string
         * @return the escaped string
         */
        public static String escapeSom(String s) {
            int idx = s.indexOf('.');
            if (idx < 0)
                return s;
            StringBuffer sb = new StringBuffer();
            int last = 0;
            while (idx >= 0) {
                sb.append(s.substring(last, idx));
                sb.append('\\');
                last = idx;
                idx = s.indexOf('.', idx + 1);
            }
            sb.append(s.substring(last));
            return sb.toString();
        }

        /**
         * Unescapes a SOM string fragment replacing "\." with ".".
         * @param s the escaped string
         * @return the unescaped string
         */
        public static String unescapeSom(String s) {
            int idx = s.indexOf('\\');
            if (idx < 0)
                return s;
            StringBuffer sb = new StringBuffer();
            int last = 0;
            while (idx >= 0) {
                sb.append(s.substring(last, idx));
                last = idx + 1;
                idx = s.indexOf('\\', idx + 1);
            }
            sb.append(s.substring(last));
            return sb.toString();
        }

        /**
         * Outputs the stack as the sequence of elements separated
         * by '.'.
         * @return the stack as the sequence of elements separated by '.'
         */
        protected String printStack() {
            if (stack.empty())
                return "";
            StringBuffer s = new StringBuffer();
            for (int k = 0; k < stack.size(); ++k)
                s.append('.').append((String)stack.get(k));
            return s.substring(1);
        }
        
        /**
         * Gets the name with the <CODE>#subform</CODE> removed.
         * @param s the long name
         * @return the short name
         */
        public static String getShortName(String s) {
            int idx = s.indexOf(".#subform[");
            if (idx < 0)
                return s;
            int last = 0;
            StringBuffer sb = new StringBuffer();
            while (idx >= 0) {
                sb.append(s.substring(last, idx));
                idx = s.indexOf("]", idx + 10);
                if (idx < 0)
                    return sb.toString();
                last = idx + 1;
                idx = s.indexOf(".#subform[", last);
            }
            sb.append(s.substring(last));
            return sb.toString();
        }
        
        /**
         * Adds a SOM name to the search node chain.
         * @param unstack the SOM name
         */
        public void inverseSearchAdd(String unstack) {
            inverseSearchAdd(inverseSearch, stack, unstack);
        }
        
        /**
         * Adds a SOM name to the search node chain.
         * @param inverseSearch the start point
         * @param stack the stack with the separeted SOM parts
         * @param unstack the full name
         */
        public static void inverseSearchAdd(HashMap inverseSearch, Stack2 stack, String unstack) {
            String last = (String)stack.peek();
            InverseStore store = (InverseStore)inverseSearch.get(last);
            if (store == null) {
                store = new InverseStore();
                inverseSearch.put(last, store);
            }
            for (int k = stack.size() - 2; k >= 0; --k) {
                last = (String)stack.get(k);
                InverseStore store2;
                int idx = store.part.indexOf(last);
                if (idx < 0) {
                    store.part.add(last);
                    store2 = new InverseStore();
                    store.follow.add(store2);
                }
                else
                    store2 = (InverseStore)store.follow.get(idx);
                store = store2;
            }
            store.part.add("");
            store.follow.add(unstack);
        }

        /**
         * Searchs the SOM hiearchie from the bottom.
         * @param parts the SOM parts
         * @return the full name or <CODE>null</CODE> if not found
         */
        public String inverseSearchGlobal(ArrayList parts) {
            if (parts.isEmpty())
                return null;
            InverseStore store = (InverseStore)inverseSearch.get(parts.get(parts.size() - 1));
            if (store == null)
                return null;
            for (int k = parts.size() - 2; k >= 0; --k) {
                String part = (String)parts.get(k);
                int idx = store.part.indexOf(part);
                if (idx < 0) {
                    if (store.isSimilar(part))
                        return null;
                    return store.getDefaultName();
                }
                store = (InverseStore)store.follow.get(idx);
            }
            return store.getDefaultName();
        }
    
        /**
         * Splits a SOM name in the individual parts.
         * @param name the full SOM name
         * @return the split name
         */
        public static Stack2 splitParts(String name) {
            while (name.startsWith("."))
                name = name.substring(1);
            Stack2 parts = new Stack2();
            int last = 0;
            int pos = 0;
            String part;
            while (true) {
                pos = last;
                while (true) {
                    pos = name.indexOf('.', pos);
                    if (pos < 0)
                        break;
                    if (name.charAt(pos - 1) == '\\')
                        ++pos;
                    else
                        break;
                }
                if (pos < 0)
                    break;
                part = name.substring(last, pos);
                if (!part.endsWith("]"))
                    part += "[0]";
                parts.add(part);
                last = pos + 1;
            }
            part = name.substring(last);
            if (!part.endsWith("]"))
                part += "[0]";
            parts.add(part);
            return parts;
        }

        /**
         * Gets the order the names appear in the XML, depth first.
         * @return the order the names appear in the XML, depth first
         */
        public ArrayList getOrder() {
            return order;
        }

        /**
         * Sets the order the names appear in the XML, depth first
         * @param order the order the names appear in the XML, depth first
         */
        public void setOrder(ArrayList order) {
            this.order = order;
        }

        /**
         * Gets the mapping of full names to nodes.
         * @return the mapping of full names to nodes
         */
        public HashMap getName2Node() {
            return name2Node;
        }

        /**
         * Sets the mapping of full names to nodes.
         * @param name2Node the mapping of full names to nodes
         */
        public void setName2Node(HashMap name2Node) {
            this.name2Node = name2Node;
        }

        /**
         * Gets the data to do a search from the bottom hierarchie.
         * @return the data to do a search from the bottom hierarchie
         */
        public HashMap getInverseSearch() {
            return inverseSearch;
        }

        /**
         * Sets the data to do a search from the bottom hierarchie.
         * @param inverseSearch the data to do a search from the bottom hierarchie
         */
        public void setInverseSearch(HashMap inverseSearch) {
            this.inverseSearch = inverseSearch;
        }
    }
    
    /**
     * Processes the datasets section in the XFA form.
     */
    public static class Xml2SomDatasets extends Xml2Som {
        /**
         * Creates a new instance from the datasets node. This expects
         * not the datasets but the data node that comes below.