/*
* eXist Open Source Native XML Database
* Copyright (C) 2001 Wolfgang M. Meier
* wolfgang@exist-db.org
* http://exist-db.org
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* $Id$
*/
package org.exist.xquery;
import org.exist.memtree.MemTreeBuilder;
import org.exist.memtree.NodeImpl;
import org.exist.xquery.util.ExpressionDumper;
import org.exist.xquery.value.Item;
import org.exist.xquery.value.Sequence;
import org.exist.xquery.value.StringValue;
/**
* Direct constructor for text nodes.
*
* @author wolf
*/
public class TextConstructor extends NodeConstructor {
private final String text;
private boolean isWhitespaceOnly = true;
public TextConstructor(XQueryContext context, String text) throws XPathException {
super(context);
this.text = StringValue.expand(text);
for (int i = 0; i < text.length(); i++) {
if (!isWhiteSpace(text.charAt(i))) {
isWhitespaceOnly = false;
break;
}
}
}
/* (non-Javadoc)
* @see org.exist.xquery.Expression#eval(org.exist.xquery.StaticContext, org.exist.dom.DocumentSet, org.exist.xquery.value.Sequence, org.exist.xquery.value.Item)
*/
public Sequence eval(Sequence contextSequence, Item contextItem) throws XPathException {
if (isWhitespaceOnly && context.stripWhitespace())
{return Sequence.EMPTY_SEQUENCE;}
if (newDocumentContext)
{context.pushDocumentContext();}
try {
final MemTreeBuilder builder = context.getDocumentBuilder();
context.proceed(this, builder);
final int nodeNr = builder.characters(text);
final NodeImpl node = builder.getDocument().getNode(nodeNr);
return node;
} finally {
if (newDocumentContext)
{context.popDocumentContext();}
}
}
/* (non-Javadoc)
* @see org.exist.xquery.Expression#dump(org.exist.xquery.util.ExpressionDumper)
*/
public void dump(ExpressionDumper dumper) {
dumper.display("text {");
dumper.startIndent();
dumper.display(text);
dumper.endIndent();
dumper.nl().display("}");
}
public String toString() {
final StringBuilder result = new StringBuilder();
result.append("text {");
result.append(text.toString());
result.append("}");
return result.toString();
}
protected final static boolean isWhiteSpace(char ch) {
return (ch == 0x20) || (ch == 0x09) || (ch == 0xD) || (ch == 0xA);
}
public String getText() {
return text;
}
@Override
public boolean allowMixedNodesInReturn() {
return true;
}
}