com.squarespace.template.CodeStats Maven / Gradle / Ivy

/**
 * Copyright (c) 2014 SQUARESPACE, Inc.
 *
 * 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.squarespace.template;

import java.util.HashMap;
import java.util.Map;

import com.squarespace.template.Instructions.IfPredicateInst;
import com.squarespace.template.Instructions.PredicateInst;
import com.squarespace.template.Instructions.VariableInst;


/**
 * Examines sequences of instructions and gathers some statistics.
 */
public class CodeStats implements CodeSink {

  private Counter instructionCounter;

  private Counter formatterCounter;

  private Counter predicateCounter;

  private int totalInstructions;

  public CodeStats() {
    this.instructionCounter = new Counter<>();
    this.formatterCounter = new Counter<>();
    this.predicateCounter = new Counter<>();
  }

  @Override
  public void accept(Instruction instruction) throws CodeSyntaxException {
    totalInstructions++;
    InstructionType type = instruction.getType();
    instructionCounter.increment(type);
    switch (type) {

      case PREDICATE:
      case OR_PREDICATE:
        Predicate predicate = ((PredicateInst)instruction).getPredicate();
        if (predicate != null) {
          predicateCounter.increment(predicate.identifier());
        }
        break;

      case IF:
        if (instruction instanceof IfPredicateInst) {
          predicateCounter.increment(((IfPredicateInst)instruction).getPredicate().identifier());
        }
        break;

      case VARIABLE:
        for (FormatterCall formatter : ((VariableInst)instruction).getFormatters()) {
          formatterCounter.increment(formatter.getFormatter().identifier());
        }
        break;

      default:
        break;
    }
  }

  @Override
  public void complete() {

  }

  public int getTotalInstructions() {
    return totalInstructions;
  }

  public Map getInstructionCounts() {
    return instructionCounter.getMap();
  }

  public Map getFormatterCounts() {
    return formatterCounter.getMap();
  }

  public Map getPredicateCounts() {
    return predicateCounter.getMap();
  }


  private static class Counter {

    private Map map = new HashMap<>();

    public void increment(K key) {
      Integer val = map.get(key);
      if (val == null) {
        val = 0;
      }
      map.put(key, val + 1);
    }

    public Map getMap() {
      return map;
    }
  }
}