/*
* @(#)$Id: AttributeConstructor.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 java.util.ArrayList;
import java.util.List;
import xbird.xquery.XQueryConstants;
import xbird.xquery.XQueryException;
import xbird.xquery.dm.XQEventReceiver;
import xbird.xquery.dm.instance.XQueryDataModel;
import xbird.xquery.dm.value.Item;
import xbird.xquery.dm.value.Sequence;
import xbird.xquery.dm.value.node.DMAttribute;
import xbird.xquery.dm.value.sequence.AtomizedSequence;
import xbird.xquery.expr.XQExpression;
import xbird.xquery.meta.*;
import xbird.xquery.misc.QNameTable.QualifiedName;
import xbird.xquery.parser.XQueryParserVisitor;
import xbird.xquery.type.node.AttributeTest;
/**
*
* <DIV lang="en"></DIV>
* <DIV lang="ja"></DIV>
*
* @author Makoto YUI (yuin405+xbird@gmail.com)
*/
public class AttributeConstructor extends AttributeConstructorBase {
private static final long serialVersionUID = 1939114435839918721L;
private final QualifiedName name; // avoid null for ComputedAttributeConstructor
private final List<XQExpression> valueExprs;
public AttributeConstructor(QualifiedName name) {
this(name, new ArrayList<XQExpression>(4));
}
public AttributeConstructor(XQExpression nameExpr) {
this(null, new ArrayList<XQExpression>(4));
this._nameExpr = nameExpr;
}
public AttributeConstructor(QualifiedName name, List<XQExpression> value) {
this.name = name;
this.valueExprs = value;
this._type = AttributeTest.ANY_ATTRIBUTE;
}
public XQExpression visit(XQueryParserVisitor visitor, XQueryContext ctxt)
throws XQueryException {
return visitor.visit(this, ctxt);
}
//--------------------------------------------
// getter/setter
public void addValue(XQExpression values) {
valueExprs.add(values);
}
public QualifiedName getName() {
return this.name;
}
public List<XQExpression> getValueExprs() {
return this.valueExprs;
}
//--------------------------------------------
// static analysis/dynamic evaluation
public XQExpression staticAnalysis(StaticContext statEnv) throws XQueryException {
if(!_analyzed) {
this._analyzed = true;
if(name == null) {
this._nameExpr = _nameExpr.staticAnalysis(statEnv);
}
if(_value == null) {
for(int i = 0; i < valueExprs.size(); i++) {
XQExpression v = valueExprs.get(i);
valueExprs.set(i, v.staticAnalysis(statEnv));
}
}
}
return this;
}
/**
* @link http://www.w3.org/TR/xquery/#id-computedAttributes
*/
public DMAttribute eval(Sequence<? extends Item> contextSeq, DynamicContext dynEnv)
throws XQueryException {
// process name
QualifiedName instName = this.name;
if(instName == null) { // note that should not cache it
instName = processNameExpr(contextSeq, dynEnv);
}
if(XQueryConstants.XMLNS_URI.equals(instName.getNamespaceURI())
|| (instName.getNamespaceURI().length() == 0 && XQueryConstants.XMLNS.equals(instName.getLocalPart()))) {
reportError("err:XQDY0044", "Invalid namespace format.. " + instName);
}
// process content
String instValue = this._value;
if(instValue == null) {
instValue = processContentExpr(contextSeq, dynEnv);
}
return XQueryDataModel.createAttribute(instName, instValue);
}
@Override
public void evalAsEvents(XQEventReceiver handler, Sequence<? extends Item> contextSeq, DynamicContext dynEnv)
throws XQueryException {
// process name
QualifiedName instName = this.name;
if(instName == null) { // note that should not cache it
instName = processNameExpr(contextSeq, dynEnv);
}
if(XQueryConstants.XMLNS_URI.equals(instName.getNamespaceURI())
|| (instName.getNamespaceURI().length() == 0 && XQueryConstants.XMLNS.equals(instName.getLocalPart()))) {
reportError("err:XQDY0044", "Invalid namespace format.. " + instName);
}
// process content
String instValue = this._value;
if(instValue == null) {
instValue = processContentExpr(contextSeq, dynEnv);
}
handler.evAttribute(instName, instValue);
}
private String processContentExpr(Sequence contextSeq, DynamicContext dynEnv)
throws XQueryException {
final int size = valueExprs.size();
if(size == 0) {
return "";
}
final StringBuilder buf = new StringBuilder(128);
for(int i = 0; i < size; i++) {
final XQExpression v = valueExprs.get(i);
final Sequence rawseq = v.eval(contextSeq, dynEnv);
final Sequence seq = AtomizedSequence.wrap(rawseq, dynEnv);
final IFocus<Item> itor = seq.iterator();
if(itor.hasNext()) {
while(true) {
final Item it = itor.next();
buf.append(it.stringValue());
if(itor.hasNext()) {
buf.append(' ');
} else {
break;
}
}
}
itor.closeQuietly();
}
return buf.toString();
}
}