ASTConst.java

//--------------------------------------------------------------------------
//	Copyright (c) 1998-2004, Drew Davidson and Luke Blanshard
//  All rights reserved.
//
//	Redistribution and use in source and binary forms, with or without
//  modification, are permitted provided that the following conditions are
//  met:
//
//	Redistributions of source code must retain the above copyright notice,
//  this list of conditions and the following disclaimer.
//	Redistributions in binary form must reproduce the above copyright
//  notice, this list of conditions and the following disclaimer in the
//  documentation and/or other materials provided with the distribution.
//	Neither the name of the Drew Davidson nor the names of its contributors
//  may be used to endorse or promote products derived from this software
//  without specific prior written permission.
//
//	THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
//  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
//  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
//  FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
//  COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
//  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
//  BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
//  OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
//  AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
//  OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
//  THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
//  DAMAGE.
//--------------------------------------------------------------------------
package ariba.util.expr;

import java.math.*;
import ariba.util.core.ArrayUtil;

/**
 * @author Luke Blanshard (blanshlu@netscape.net)
 * @author Drew Davidson (drew@ognl.org)
 */
class ASTConst extends SimpleNode
{
    private Object value;

    public ASTConst(int id) {
        super(id);
    }

    public ASTConst(ExprParser p, int id) {
        super(p, id);
    }

      /** Called from parser actions. */
    void setValue( Object value ) {
        this.value = value;
    }

    public Object getValue() {
        return value;
    }

    protected Object getValueBody( ExprContext context, Object source ) throws ExprException {
        return this.value;
    }

    public boolean isNodeConstant( ExprContext context ) throws ExprException
    {
        return true;
    }

    public String getEscapedChar(char ch)
    {
        String          result;

        switch(ch) {
            case '\b':
                result = "\b";
                break;
            case '\t':
                result = "\\t";
                break;
            case '\n':
                result = "\\n";
                break;
            case '\f':
                result = "\\f";
                break;
            case '\r':
                result = "\\r";
                break;
            case '\"':
                result = "\\\"";
                break;
            case '\'':
                result = "\\\'";
                break;
            case '\\':
                result = "\\\\";
                break;
            default:
                if (Character.isISOControl(ch) || (ch > 255)) {
                    String      hc = Integer.toString((int)ch, 16);
                    int         hcl = hc.length();

                    result = "\\u";
                    if (hcl < 4) {
                        if (hcl == 3) {
                            result = result + "0";
                        } else {
                            if (hcl == 2) {
                                result = result + "00";
                            } else {
                                result = result + "000";
                            }
                        }
                    }

                    result = result + hc;
                } else {
                    result = new String(ch + "");
                }
                break;
        }
        return result;
    }

    public String getEscapedString(String value)
    {
        StringBuffer        result = new StringBuffer();

        for (int i = 0, icount = value.length(); i < icount; i++) {
            result.append(getEscapedChar(value.charAt(i)));
        }
        return new String(result);
    }

    public String toString()
    {
        String      result;

        if (value == null) {
            result = "null";
        } else {
            if (value instanceof String) {
                result = '\"' + getEscapedString(value.toString()) + '\"';
            } else {
                if (value instanceof Character) {
                    result = '\'' + getEscapedChar(((Character)value).charValue()) + '\'';
                } else {
                    result = value.toString();
                    if (value instanceof Long) {
                        result = result + "L";
                    } else {
                        if (value instanceof BigDecimal) {
                            result = result + "B";
                        } else {
                            if (value instanceof BigInteger) {
                                result = result + "H";
                            } else {
                                if (value instanceof Node) {
                                    result = ":[ " + result + " ]";
                                }
                            }
                        }
                    }
                }
            }
        }
        return result;
    }

    public void accept (ASTNodeVisitor visitor)
    {
        acceptChildren(visitor);
        visitor.visit(this);
    }
}