Source Code Cross Referenced for TinyParentNodeImpl.java in  » XML » XPath-Saxon » net » sf » saxon » tinytree » 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.tinytree 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        package net.sf.saxon.tinytree;
002:
003:        import net.sf.saxon.type.Type;
004:        import net.sf.saxon.om.FastStringBuffer;
005:
006:        /**
007:         * TinyParentNodeImpl is an implementation of a non-leaf node (specifically, an Element node
008:         * or a Document node)
009:         * @author Michael H. Kay
010:         */
011:
012:        abstract class TinyParentNodeImpl extends TinyNodeImpl {
013:
014:            /**
015:             * Determine if the node has children.
016:             */
017:
018:            public final boolean hasChildNodes() {
019:                return (nodeNr + 1 < tree.numberOfNodes && tree.depth[nodeNr + 1] > tree.depth[nodeNr]);
020:            }
021:
022:            /**
023:             * Return the string-value of the node, that is, the concatenation
024:             * of the character content of all descendent elements and text nodes.
025:             * @return the accumulated character content of the element, including descendant elements.
026:             */
027:
028:            public final String getStringValue() {
029:                return getStringValue(tree, nodeNr).toString();
030:            }
031:
032:            /**
033:             * Get the value of the item as a CharSequence. This is in some cases more efficient than
034:             * the version of the method that returns a String.
035:             */
036:
037:            public CharSequence getStringValueCS() {
038:                return getStringValue(tree, nodeNr);
039:            }
040:
041:            /**
042:             * Get the string value of a node. This static method allows the string value of a node
043:             * to be obtained without instantiating the node as a Java object. The method also returns
044:             * a CharSequence rather than a string, which means it can sometimes avoid copying the
045:             * data.
046:             * @param tree The containing document
047:             * @param nodeNr identifies the node whose string value is required. This must be a
048:             * document or element node. The caller is trusted to ensure this.
049:             * @return the string value of the node, as a CharSequence
050:             */
051:
052:            public static final CharSequence getStringValue(TinyTree tree,
053:                    int nodeNr) {
054:                int level = tree.depth[nodeNr];
055:
056:                // note, we can't rely on the value being contiguously stored because of whitespace
057:                // nodes: the data for these may still be present.
058:
059:                int next = nodeNr + 1;
060:
061:                // we optimize two special cases: firstly, where the node has no children, and secondly,
062:                // where it has a single text node as a child.
063:
064:                if (tree.depth[next] <= level) {
065:                    return "";
066:                } else if (tree.nodeKind[next] == Type.TEXT
067:                        && tree.depth[next + 1] <= level) {
068:                    int length = tree.beta[next];
069:                    int start = tree.alpha[next];
070:                    return new CharSlice(tree.charBuffer, start, length);
071:                }
072:
073:                // now handle the general case
074:
075:                FastStringBuffer sb = null;
076:                while (next < tree.numberOfNodes && tree.depth[next] > level) {
077:                    if (tree.nodeKind[next] == Type.TEXT) {
078:                        int length = tree.beta[next];
079:                        int start = tree.alpha[next];
080:                        if (sb == null) {
081:                            sb = new FastStringBuffer(1024);
082:                        }
083:                        sb.append(tree.charBuffer, start, length);
084:                    }
085:                    next++;
086:                }
087:                if (sb == null)
088:                    return "";
089:                return sb.condense();
090:            }
091:
092:        }
093:
094:        //
095:        // The contents of this file are subject to the Mozilla Public License Version 1.0 (the "License");
096:        // you may not use this file except in compliance with the License. You may obtain a copy of the
097:        // License at http://www.mozilla.org/MPL/
098:        //
099:        // Software distributed under the License is distributed on an "AS IS" basis,
100:        // WITHOUT WARRANTY OF ANY KIND, either express or implied.
101:        // See the License for the specific language governing rights and limitations under the License.
102:        //
103:        // The Original Code is: all this file.
104:        //
105:        // The Initial Developer of the Original Code is Michael H. Kay.
106:        //
107:        // Portions created by (your name) are Copyright (C) (your legal entity). All Rights Reserved.
108:        //
109:        // Contributor(s): none.
110:        //
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