/*

 * @(#)$Id: ValidateOp.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.dyna;



import xbird.xquery.XQueryException;

import xbird.xquery.dm.value.Item;

import xbird.xquery.dm.value.Sequence;

import xbird.xquery.expr.AbstractXQExpression;

import xbird.xquery.expr.XQExpression;

import xbird.xquery.meta.*;

import xbird.xquery.parser.XQueryParserVisitor;



/**

 * 

 * <DIV lang="en"></DIV>

 * <DIV lang="ja"></DIV>

 * 

 * @author Makoto YUI (yuin405+xbird@gmail.com)

 * @link http://www.w3.org/TR/xquery/#id-validate

 * @link http://www.w3.org/TR/xquery-semantics/#sec_validate_expr

 */

public final class ValidateOp extends AbstractXQExpression {

    private static final long serialVersionUID = 3230093526066669323L;

    

    private final boolean isStrict;

    private final XQExpression expr;



    public ValidateOp(XQExpression expr) {

        this(expr, true);

    }



    public ValidateOp(XQExpression expr, boolean strict) {

        this.expr = expr;

        this.isStrict = strict;

    }



    public XQExpression visit(XQueryParserVisitor visitor, XQueryContext ctxt) throws XQueryException {

        return visitor.visit(this, ctxt);

    }

    

    public XQExpression getExpression() {

        return this.expr;

    }



    public boolean isStrict() {

        return this.isStrict;

    }



    @Override

    public String toString() {

        final StringBuilder buf = new StringBuilder();

        buf.append("validate ");

        if (isStrict == false) {

            buf.append("lax ");

        }

        buf.append('{');

        buf.append(expr.toString());

        buf.append('}');

        return buf.toString();

    }



    public XQExpression staticAnalysis(StaticContext statEnv) throws XQueryException {

        assert (!_analyzed);

        return expr.staticAnalysis(statEnv);

    }



    public Sequence<? extends Item> eval(Sequence<? extends Item> contextSeq, DynamicContext dynEnv) throws XQueryException {

        throw new UnsupportedOperationException("ValidationExpr is not supported.");

    }



}