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

/*
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2002-2003 The Apache Software Foundation.  All rights
 * reserved.
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 * 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
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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/)."
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 *    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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 * 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.CastOrTreatAsExpr;
import org.apache.xpath.expression.Expr;
import org.apache.xpath.impl.parser.Node;
import org.apache.xpath.impl.parser.SimpleNode;
import org.apache.xpath.impl.parser.XPath;
import org.apache.xpath.impl.parser.XPathTreeConstants;


/**
 * Default implementation of <code>CastOrTreatAsExpr</code> interface.
 */
public class CastOrTreatAsExprImpl extends ExprImpl implements CastOrTreatAsExpr
{
    /**
     * Constructor for CastExprImpl.
     *
     * @param i
     */
    public CastOrTreatAsExprImpl(int i)
    {
        super(i);

        m_children = new Node[2];
    }

    /**
     * Constructor for CastExprImpl.
     *
     * @param p
     * @param i
     */
    public CastOrTreatAsExprImpl(XPath p, int i)
    {
        super(p, i);

        m_children = new Node[2];
    }

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

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

    /**
     * Constructor for factory
     *
     * @param type DOCUMENT ME!
     * @param expr DOCUMENT ME!
     */
    public CastOrTreatAsExprImpl(SequenceType type, Expr expr, boolean isCast)
    {
        super( (isCast) ? XPathTreeConstants.JJTCASTEXPR:XPathTreeConstants.JJTTREATEXPR);

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

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

    /**
     * @see org.apache.xpath.expression.Expr#getExprType()
     */
    public short getExprType()
    {
        return (id == XPathTreeConstants.JJTCASTEXPR) ? CAST_AS_EXPR
                                                      : TREAT_AS_EXPR;
    }

    /**
     * @see org.apache.xpath.expression.CastExpr#getParenthesizedExpr()
     */
    public Expr getExpr()
    {
        return (Expr) m_children[1];
    }

    /**
     * @see org.apache.xpath.expression.CastExpr#getSequenceType()
     */
    public SequenceType getSequenceType()
    {
        return (SequenceType) m_children[0];
    }

    /**
     * @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)
    {
        expr.append((getExprType() == CAST_AS_EXPR) ? "cast as " : "treat as ");
        ((SimpleNode) getSequenceType()).getString(expr, abbreviate);
        expr.append('(');
        ((ExprImpl) getExpr()).getString(expr, abbreviate);
        expr.append(')');
    }
}