/*
* @(#)$Id: CommentConstructor.java 3619 2008-03-26 07:23:03Z yui $
*
* Copyright 2006-2008 Makoto YUI
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* Contributors:
* Makoto YUI - initial implementation
*/
package xbird.xquery.expr.constructor;
import xbird.util.xml.XMLUtils;
import xbird.xquery.XQueryException;
import xbird.xquery.dm.XQEventReceiver;
import xbird.xquery.dm.value.*;
import xbird.xquery.dm.value.node.DMComment;
import xbird.xquery.dm.value.sequence.AtomizedSequence;
import xbird.xquery.expr.AbstractXQExpression;
import xbird.xquery.expr.XQExpression;
import xbird.xquery.meta.*;
import xbird.xquery.parser.XQueryParserVisitor;
import xbird.xquery.type.node.NodeType;
/**
*
* <DIV lang="en"></DIV>
* <DIV lang="ja"></DIV>
*
* @author Makoto YUI (yuin405+xbird@gmail.com)
*/
public final class CommentConstructor extends AbstractXQExpression implements NodeConstructor {
private static final long serialVersionUID = 8031506689888119544L;
private final String _content; // avoid null for computed construction
private XQExpression _contentExpr = null;
public CommentConstructor(XQExpression content) {
this(getValued(content));
this._contentExpr = content;
}
public CommentConstructor(String content) {
this._content = content;
this._type = NodeType.COMMENT;
}
public String getContent() {
return this._content;
}
public XQExpression getContentExpr() {
return this._contentExpr;
}
public XQExpression visit(XQueryParserVisitor visitor, XQueryContext ctxt)
throws XQueryException {
return visitor.visit(this, ctxt);
}
//--------------------------------------------
// static analysis/dynamic eval
public XQExpression staticAnalysis(StaticContext statEnv) throws XQueryException {
if(!_analyzed) {
this._analyzed = true;
if(_content == null) {
assert (_contentExpr != null);
this._contentExpr = _contentExpr.staticAnalysis(statEnv);
} else {
checkToken(_content);
}
}
return this;
}
public Sequence<? extends Item> eval(Sequence<? extends Item> contextSeq, DynamicContext dynEnv)
throws XQueryException {
String instContent = _content;
if(instContent == null) {
instContent = processContentExpr(contextSeq, dynEnv);
}
assert (instContent != null);
checkToken(instContent);
return new DMComment(instContent);
}
@Override
public void evalAsEvents(XQEventReceiver handler, Sequence<? extends Item> contextSeq, DynamicContext dynEnv)
throws XQueryException {
String instContent = _content;
if(instContent == null) {
instContent = processContentExpr(contextSeq, dynEnv);
}
assert (instContent != null);
handler.evComment(instContent);
}
//--------------------------------------------
// helpers
private String processContentExpr(Sequence<? extends Item> contextSeq, DynamicContext dynEnv)
throws XQueryException {
final StringBuilder buf = new StringBuilder(128);
final Sequence<? extends Item> seq = _contentExpr.eval(contextSeq, dynEnv);
final IAtomized<AtomicValue> atomized = AtomizedSequence.wrap(seq, dynEnv);
final IFocus<AtomicValue> itor = atomized.iterator();
for(AtomicValue it : itor) {
buf.append(it.stringValue());
if(itor.hasNext()) {
buf.append(' ');
}
}
itor.closeQuietly();
return buf.toString();
}
private void checkToken(String content) throws XQueryException {
assert (content != null);
if(!XMLUtils.isValidComment(content)) {
reportError("err:XQDY0072", "The result format of the content expression is invalid: "
+ content);
}
}
}