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JBBP (Java Binary Block Parser) is a small lightweight framework to parse binary data in Java, it has own DSL to describe parsing data format

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/*
 * Copyright 2017 Igor Maznitsa.
 *
 * 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.igormaznitsa.jbbp.compiler.conversion;

import com.igormaznitsa.jbbp.JBBPNamedNumericFieldMap;
import com.igormaznitsa.jbbp.compiler.JBBPCompiledBlock;
import com.igormaznitsa.jbbp.compiler.varlen.JBBPIntegerValueEvaluator;
import com.igormaznitsa.jbbp.io.JBBPBitInputStream;

/**
 * Auxiliary class to process expression with only integer constant.
 *
 * @since 1.3.0
 */
final class IntConstValueEvaluator implements JBBPIntegerValueEvaluator {

  private static final long serialVersionUID = 4640385518512384490L;

  /**
   * The Field contains integer constant.
   */
  private final int value;

  IntConstValueEvaluator(final int value) {
    this.value = value;
  }

  @Override
  public int eval(final JBBPBitInputStream inStream, final int currentCompiledBlockOffset, final JBBPCompiledBlock block, final JBBPNamedNumericFieldMap fieldMap) {
    return this.value;
  }

  @Override
  public void visitItems(JBBPCompiledBlock block, int currentCompiledBlockOffset, ExpressionEvaluatorVisitor visitor) {
    visitor.visitStart();
    visitor.visitConstant(this.value);
    visitor.visitEnd();
  }

}