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Spock is a testing and specification framework for Java and Groovy applications. What makes it stand out from the crowd is its beautiful and highly expressive specification language. Thanks to its JUnit runner, Spock is compatible with most IDEs, build tools, and continuous integration servers. Spock is inspired from JUnit, jMock, RSpec, Groovy, Scala, Vulcans, and other fascinating life forms.

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/*
 * Copyright 2012 the original author or authors.
 *
 * 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
 *     https://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.spockframework.junit4;

import org.junit.internal.AssumptionViolatedException;
import org.junit.runners.model.*;
import org.opentest4j.*;

import org.spockframework.runtime.extension.ExtensionException;
import org.spockframework.runtime.extension.IMethodInterceptor;
import org.spockframework.runtime.extension.IMethodInvocation;
import org.spockframework.runtime.model.FieldInfo;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import static java.util.Collections.reverse;

public abstract class AbstractRuleInterceptor implements IMethodInterceptor {
  protected final List ruleFields;

  public AbstractRuleInterceptor(List ruleFields) {
    // we need to reverse here as we create the Statements in reversed order
    ArrayList reversedFields = new ArrayList<>(ruleFields);
    reverse(reversedFields);
    this.ruleFields = reversedFields;
  }

  protected Statement createBaseStatement(final IMethodInvocation invocation) {
    return new Statement() {
      @Override
      public void evaluate() throws Throwable {
        invocation.proceed();
      }
    };
  }

  protected Object getRuleInstance(FieldInfo field, Object fieldTarget) {
    Object rule = field.readValue(fieldTarget);
    if (rule == null) {
      try {
        rule = field.getType().getDeclaredConstructor().newInstance();
        field.writeValue(fieldTarget, rule);
      } catch (Exception e) {
        throw new ExtensionException("Auto-instantiating @Rule field '%s' failed. You may have to instantiate it manually.", e).withArgs(field.getName());
      }
    }
    return rule;
  }

  protected void evaluateStatement(Statement statement) throws Throwable {
    try {
      statement.evaluate();
    } catch (AssumptionViolatedException assumption) {
      throw new TestAbortedException(assumption.getMessage(), assumption);
    } catch (MultipleFailureException mfe) {
      throw new MultipleFailuresError("There were multiple errors", mfe.getFailures());
    }

  }
}