/**
 *  ServingXML
 *  
 *  Copyright (C) 2006  Daniel Parker
 *    daniel.parker@servingxml.com 
 * 
 * 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. 
 * 
 **/

package com.servingxml.expr.substitution;

import com.servingxml.util.record.Record;

/**
 * The <code>SubstitutionExpr</code> implements a class that
 * does parameter substitution in strings.
 * 
 * @author Daniel A. Parker (daniel.parker@servingxml.com)
 */
                             
public class EscapedSubstitutionExpression extends SubstitutionExpr {

  private final SubstitutionExpr expr;
  private final EscapeSubstitutionVariables escapedChar;

  public EscapedSubstitutionExpression(SubstitutionExpr expr, EscapeSubstitutionVariables escapedChar) {
    this.expr = expr;
    this.escapedChar = escapedChar;
  }

  public String evaluateAsString(Record parameters, Record record) {
    String s = expr.evaluateAsString(parameters, record);
    return escapedChar.escape(s);
  }
  public String[] evaluateAsStringArray(Record parameters, Record record) {
    String[] a = expr.evaluateAsStringArray(parameters, record);
    for (int i = 0; i < a.length; ++i) {
      a[i] = escapedChar.escape(a[i]);
    }
    return a;
  }
  public boolean isLiteral() {
    return expr.isLiteral();
  }

  public boolean isNull() {
    return false;
  }
}
