NullParsingContext.java

/*
 * Copyright (c) 2001-2017, Zoltan Farkas All Rights Reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 * Additionally licensed with:
 *
 * 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 org.spf4j.zel.vm;

import javax.annotation.Nullable;
import org.spf4j.zel.instr.Instruction;
import org.spf4j.zel.instr.NOP;

/**
 *
 * @author zoly
 */
public final class NullParsingContext implements ParsingContext {

  public static final NullParsingContext INSTANCE = new NullParsingContext();

  private NullParsingContext() {
  }

  /**
   * return the current code address
   *
   * @return
   */
  @Override
  public int getAddress() {
    throw new UnsupportedOperationException("Not supported yet.");
  }

  @Override
  @Nullable
  public ProgramBuilder getProgramBuilder() {
    return null;
  }

  @Override
  public void generateCodeAll(final ParsingContext parsingContext) {
    //this is a null context
  }

  @Override
  public NullParsingContext createSubContext() {
    return INSTANCE;
  }

  @Override
  public void staticSymbol(final String name, final Object object) {
    //this is a null context
  }

  @Override
  public void staticSymbol(final String name) {
    //this is a null context
  }

  @Override
  public Instruction getLast() {
    return NOP.INSTANCE;
  }

  @Override
  public void generateCode(final Location[] loc, final Instruction... args) {
    //this is a null context
  }

  @Override
  public void generateCode(final Location loc, final Instruction instr) {
    //this is a null context
  }

}