xpath_rwapi/src2/org/apache/xpath/impl/CastableAsExprImpl.java

/*
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2002-2003 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
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 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright
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 *    distribution.
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 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
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 * 5. Products derived from this software may not be called "Apache",
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 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation and was
 * originally based on software copyright (c) 2002, International
 * Business Machines Corporation., http://www.ibm.com.  For more
 * information on the Apache Software Foundation, please see
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 */
package org.apache.xpath.impl;

import org.apache.xpath.datamodel.SequenceType;
import org.apache.xpath.expression.CastableAsExpr;
import org.apache.xpath.expression.Expr;
import org.apache.xpath.expression.Visitor;
import org.apache.xpath.impl.parser.Node;
import org.apache.xpath.impl.parser.SimpleNode;
import org.apache.xpath.impl.parser.XPath;


/**
 * Default implementation of 'castable as' expression type.
 */
public class CastableAsExprImpl extends ExprImpl implements CastableAsExpr
{
    /**
     * Constructor for CastableExprImpl. Internal uses only
     *
     * @param i
     */
    public CastableAsExprImpl(int i)
    {
        super(i);

        m_children = new Node[2];
    }

    /**
     * Constructor for CastableExprImpl. Internal uses only
     *
     * @param p
     * @param i
     */
    public CastableAsExprImpl(XPath p, int i)
    {
        super(p, i);

        m_children = new Node[2];
    }

    /**
     * Constructor for cloning
     *
     * @param expr DOCUMENT ME!
     */
    protected CastableAsExprImpl(CastableAsExprImpl expr)
    {
        super(expr.id);

        m_children = new Node[2];
        m_children[0] = (Node) ((Expr) m_children[0]).cloneExpression();
        m_children[1] = m_children[1]; // TODO: clone
    }

    /**
     * Constructor for factory
     *
     * @param expr DOCUMENT ME!
     * @param type DOCUMENT ME!
     */
    protected CastableAsExprImpl(Expr expr, SequenceType type)
    {
        super();

        m_children = new Node[2];
        m_children[0] = (Node) expr;
        m_children[1] = (Node) type;
    }

    /**
     * @see org.apache.xpath.expression.Expr#getExprType()
     */
    public short getExprType()
    {
        return Expr.CASTABLE_EXPR;
    }

    /**
     * @see org.apache.xpath.expression.Expr#cloneExpression()
     */
    public Expr cloneExpression()
    {
        return new CastableAsExprImpl(this);
    }

    /**
     * @see org.apache.xpath.expression.CastableExpr#getCastableExpr()
     */
    public Expr getExpr()
    {
        return (Expr) m_children[0];
    }

    /**
     * @see org.apache.xpath.expression.CastableExpr#getSingleType()
     */
    public SequenceType getSingleType()
    {
        return (SequenceType) m_children[1];
    }

    /**
     * @see org.apache.xpath.impl.parser.Node#jjtAddChild(Node, int)
     */
    public void jjtAddChild(Node n, int i)
    {
        if (((SimpleNode) n).canBeReduced())
        {
            super.jjtAddChild(n.jjtGetChild(0), i);
        }
        else
        {
            super.jjtAddChild(n, i);
        }
    }

    /* (non-Javadoc)
     * @see org.apache.xpath.impl.parser.SimpleNode#getString(java.lang.StringBuffer, boolean)
     */
    public void getString(StringBuffer expr, boolean abbreviate)
    {
        ((ExprImpl) getExpr()).getString(expr, abbreviate);
        expr.append(" castable as ");
        ((SimpleNode) getSingleType()).getString(expr, abbreviate);
    }

    /* (non-Javadoc)
     * @see org.apache.xpath.expression.Visitable#visit(org.apache.xpath.expression.Visitor)
     */
    public boolean visit(Visitor visitor)
    {
        if (visitor.visitCastableAs(this))
        {
            return getExpr().visit(visitor);
        }

        return false;
    }
}