001: /*
002: * The Apache Software License, Version 1.1
003: *
004: *
005: * Copyright (c) 1999 The Apache Software Foundation. All rights
006: * reserved.
007: *
008: * Redistribution and use in source and binary forms, with or without
009: * modification, are permitted provided that the following conditions
010: * are met:
011: *
012: * 1. Redistributions of source code must retain the above copyright
013: * notice, this list of conditions and the following disclaimer.
014: *
015: * 2. Redistributions in binary form must reproduce the above copyright
016: * notice, this list of conditions and the following disclaimer in
017: * the documentation and/or other materials provided with the
018: * distribution.
019: *
020: * 3. The end-user documentation included with the redistribution,
021: * if any, must include the following acknowledgment:
022: * "This product includes software developed by the
023: * Apache Software Foundation (http://www.apache.org/)."
024: * Alternately, this acknowledgment may appear in the software itself,
025: * if and wherever such third-party acknowledgments normally appear.
026: *
027: * 4. The names "Xerces" and "Apache Software Foundation" must
028: * not be used to endorse or promote products derived from this
029: * software without prior written permission. For written
030: * permission, please contact apache@apache.org.
031: *
032: * 5. Products derived from this software may not be called "Apache",
033: * nor may "Apache" appear in their name, without prior written
034: * permission of the Apache Software Foundation.
035: *
036: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
037: * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
038: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
039: * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
040: * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
041: * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
042: * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
043: * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
044: * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
045: * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
046: * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
047: * SUCH DAMAGE.
048: * ====================================================================
049: *
050: * This software consists of voluntary contributions made by many
051: * individuals on behalf of the Apache Software Foundation and was
052: * originally based on software copyright (c) 1999, International
053: * Business Machines, Inc., http://www.apache.org. For more
054: * information on the Apache Software Foundation, please see
055: * <http://www.apache.org/>.
056: */
057:
058: /*
059: * WARNING: because java doesn't support multi-inheritance some code is
060: * duplicated. If you're changing this file you probably want to change
061: * DeferredAttrNSImpl.java at the same time.
062: */
063:
064: package org.apache.xerces.dom;
065:
066: import org.apache.xerces.utils.StringPool;
067:
068: /**
069: * Attribute represents an XML-style attribute of an
070: * Element. Typically, the allowable values are controlled by its
071: * declaration in the Document Type Definition (DTD) governing this
072: * kind of document.
073: * <P>
074: * If the attribute has not been explicitly assigned a value, but has
075: * been declared in the DTD, it will exist and have that default. Only
076: * if neither the document nor the DTD specifies a value will the
077: * Attribute really be considered absent and have no value; in that
078: * case, querying the attribute will return null.
079: * <P>
080: * Attributes may have multiple children that contain their data. (XML
081: * allows attributes to contain entity references, and tokenized
082: * attribute types such as NMTOKENS may have a child for each token.)
083: * For convenience, the Attribute object's getValue() method returns
084: * the string version of the attribute's value.
085: * <P>
086: * Attributes are not children of the Elements they belong to, in the
087: * usual sense, and have no valid Parent reference. However, the spec
088: * says they _do_ belong to a specific Element, and an INUSE exception
089: * is to be thrown if the user attempts to explicitly share them
090: * between elements.
091: * <P>
092: * Note that Elements do not permit attributes to appear to be shared
093: * (see the INUSE exception), so this object's mutability is
094: * officially not an issue.
095: * <P>
096: * DeferredAttrImpl inherits from AttrImpl which does not support
097: * Namespaces. DeferredAttrNSImpl, which inherits from AttrNSImpl, does.
098: * @see DeferredAttrNSImpl
099: *
100: *
101: * @author Andy Clark, IBM
102: * @author Arnaud Le Hors, IBM
103: * @version
104: * @since PR-DOM-Level-1-19980818.
105: */
106: public final class DeferredAttrImpl extends AttrImpl implements
107: DeferredNode {
108:
109: //
110: // Constants
111: //
112:
113: /** Serialization version. */
114: static final long serialVersionUID = 6903232312469148636L;
115:
116: //
117: // Data
118: //
119:
120: /** Node index. */
121: protected transient int fNodeIndex;
122:
123: //
124: // Constructors
125: //
126:
127: /**
128: * This is the deferred constructor. Only the fNodeIndex is given here.
129: * All other data, can be requested from the ownerDocument via the index.
130: */
131: DeferredAttrImpl(DeferredDocumentImpl ownerDocument, int nodeIndex) {
132: super (ownerDocument, null);
133:
134: fNodeIndex = nodeIndex;
135: needsSyncData(true);
136: needsSyncChildren(true);
137:
138: } // <init>(DeferredDocumentImpl,int)
139:
140: //
141: // DeferredNode methods
142: //
143:
144: /** Returns the node index. */
145: public int getNodeIndex() {
146: return fNodeIndex;
147: }
148:
149: //
150: // Protected methods
151: //
152:
153: /** Synchronizes the data (name and value) for fast nodes. */
154: protected void synchronizeData() {
155:
156: // no need to sync in the future
157: needsSyncData(false);
158:
159: // fluff data
160: DeferredDocumentImpl ownerDocument = (DeferredDocumentImpl) ownerDocument();
161: int elementTypeName = ownerDocument.getNodeName(fNodeIndex);
162: StringPool pool = ownerDocument.getStringPool();
163: name = pool.toString(elementTypeName);
164: isSpecified(ownerDocument.getNodeValue(fNodeIndex) == 1);
165:
166: } // synchronizeData()
167:
168: /**
169: * Synchronizes the node's children with the internal structure.
170: * Fluffing the children at once solves a lot of work to keep
171: * the two structures in sync. The problem gets worse when
172: * editing the tree -- this makes it a lot easier.
173: */
174: protected void synchronizeChildren() {
175: DeferredDocumentImpl ownerDocument = (DeferredDocumentImpl) ownerDocument();
176: ownerDocument.synchronizeChildren(this , fNodeIndex);
177: } // synchronizeChildren()
178:
179: } // class DeferredAttrImpl
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