Source Code Cross Referenced for MappingIterator.java in  » XML » XPath-Saxon » net » sf » saxon » expr » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » XML » XPath Saxon » net.sf.saxon.expr 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        package net.sf.saxon.expr;
002:
003:        import net.sf.saxon.om.AtomizableIterator;
004:        import net.sf.saxon.om.Item;
005:        import net.sf.saxon.om.SequenceIterator;
006:        import net.sf.saxon.trans.XPathException;
007:
008:        /**
009:         * MappingIterator merges a sequence of sequences into a single flat
010:         * sequence. It takes as inputs an iteration, and a mapping function to be
011:         * applied to each Item returned by that iteration. The mapping function itself
012:         * returns another iteration. The result is an iteration of the concatenation of all
013:         * the iterations returned by the mapping function.<p>
014:         *
015:         * This is a powerful class. It is used, with different mapping functions,
016:         * in a great variety of ways. It underpins the way that "for" expressions and
017:         * path expressions are evaluated, as well as sequence expressions. It is also
018:         * used in the implementation of the document(), key(), and id() functions.
019:         */
020:
021:        public final class MappingIterator implements  SequenceIterator,
022:                AtomizableIterator {
023:
024:            private SequenceIterator base;
025:            private MappingFunction action;
026:            private XPathContext context;
027:            //private Object info;
028:            private SequenceIterator results = null;
029:            private boolean atomizing = false;
030:            private Item current = null;
031:            private int position = 0;
032:
033:            /**
034:             * Construct a MappingIterator that will apply a specified MappingFunction to
035:             * each Item returned by the base iterator.
036:             * @param base the base iterator
037:             * @param action the mapping function to be applied
038:             * @param context the processing context. This should be supplied only if each item to be processed
039:             * is to become the context item. In this case "base" should be the same as context.getCurrentIterator().
040:             */
041:
042:            public MappingIterator(SequenceIterator base,
043:                    MappingFunction action, XPathContext context) {
044:                // System.err.println("New Mapping iterator " + this + " with base " + base);
045:                this .base = base;
046:                this .action = action;
047:                this .context = context;
048:            }
049:
050:            public Item next() throws XPathException {
051:                Item nextItem;
052:                while (true) {
053:                    if (results != null) {
054:                        nextItem = results.next();
055:                        if (nextItem != null) {
056:                            break;
057:                        } else {
058:                            results = null;
059:                        }
060:                    }
061:                    Item nextSource = base.next();
062:                    if (nextSource != null) {
063:                        // Call the supplied mapping function
064:                        Object obj = action.map(nextSource, context);
065:
066:                        // The result may be null (representing an empty sequence), an item
067:                        // (representing a singleton sequence), or a SequenceIterator (any sequence)
068:
069:                        if (obj != null) {
070:                            if (obj instanceof  Item) {
071:                                nextItem = (Item) obj;
072:                                results = null;
073:                                break;
074:                            }
075:                            results = (SequenceIterator) obj;
076:                            if (atomizing
077:                                    && results instanceof  AtomizableIterator) {
078:                                ((AtomizableIterator) results)
079:                                        .setIsAtomizing(atomizing);
080:                            }
081:                            nextItem = results.next();
082:                            if (nextItem == null) {
083:                                results = null;
084:                            } else {
085:                                break;
086:                            }
087:                        }
088:                        // now go round the loop to get the next item from the base sequence
089:                    } else {
090:                        results = null;
091:                        current = null;
092:                        position = -1;
093:                        return null;
094:                    }
095:                }
096:
097:                current = nextItem;
098:                // System.err.println("MappingIterator.next(), this = " + this + " returning " + ((net.sf.saxon.om.NodeInfo)current).generateId() );
099:                position++;
100:                return nextItem;
101:            }
102:
103:            public Item current() {
104:                return current;
105:            }
106:
107:            public int position() {
108:                return position;
109:            }
110:
111:            public SequenceIterator getAnother() throws XPathException {
112:                // System.err.println(this + " getAnother() ");
113:                SequenceIterator newBase = base.getAnother();
114:                XPathContext c = context;
115:                if (c != null) {
116:                    c = c.newMinorContext();
117:                    c.setCurrentIterator(newBase);
118:                    c.setOrigin(context.getOrigin());
119:                }
120:                MappingIterator m = new MappingIterator(newBase, action, c);
121:                m.setIsAtomizing(atomizing);
122:                return m;
123:            }
124:
125:            /**
126:             * Get properties of this iterator, as a bit-significant integer.
127:             *
128:             * @return the properties of this iterator. This will be some combination of
129:             *         properties such as {@link GROUNDED}, {@link LAST_POSITION_FINDER},
130:             *         and {@link LOOKAHEAD}. It is always
131:             *         acceptable to return the value zero, indicating that there are no known special properties.
132:             *         It is acceptable for the properties of the iterator to change depending on its state.
133:             */
134:
135:            public int getProperties() {
136:                return ATOMIZABLE;
137:            }
138:
139:            /**
140:             * Indicate that any nodes returned in the sequence will be atomized. This
141:             * means that if it wishes to do so, the implementation can return the typed
142:             * values of the nodes rather than the nodes themselves. The implementation
143:             * is free to ignore this hint.
144:             * @param atomizing true if the caller of this iterator will atomize any
145:             * nodes that are returned, and is therefore willing to accept the typed
146:             * value of the nodes instead of the nodes themselves.
147:             */
148:
149:            public void setIsAtomizing(boolean atomizing) {
150:                this .atomizing = atomizing;
151:            }
152:
153:        }
154:
155:        //
156:        // The contents of this file are subject to the Mozilla Public License Version 1.0 (the "License");
157:        // you may not use this file except in compliance with the License. You may obtain a copy of the
158:        // License at http://www.mozilla.org/MPL/
159:        //
160:        // Software distributed under the License is distributed on an "AS IS" basis,
161:        // WITHOUT WARRANTY OF ANY KIND, either express or implied.
162:        // See the License for the specific language governing rights and limitations under the License.
163:        //
164:        // The Original Code is: all this file.
165:        //
166:        // The Initial Developer of the Original Code is Michael H. Kay
167:        //
168:        // Portions created by (your name) are Copyright (C) (your legal entity). All Rights Reserved.
169:        //
170:        // Contributor(s): none.
171:        //
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