io.github.ascopes.jct.repr.TraceDiagnosticListRepresentation Maven / Gradle / Ivy

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/*
 * Copyright (C) 2022 - 2024, 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
 *
 *    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 io.github.ascopes.jct.repr;

import static java.util.stream.Collectors.joining;

import io.github.ascopes.jct.diagnostics.TraceDiagnostic;
import java.util.Collection;
import javax.tools.JavaFileObject;
import org.assertj.core.presentation.Representation;
import org.jspecify.annotations.Nullable;

/**
 * Representation of a collection of diagnostics.
 *
 * @author Ashley Scopes
 * @since 0.0.1
 */
public final class TraceDiagnosticListRepresentation implements Representation {

  private static final TraceDiagnosticListRepresentation INSTANCE
      = new TraceDiagnosticListRepresentation();

  /**
   * Get an instance of this diagnostic collection representation.
   *
   * @return the instance.
   */
  public static TraceDiagnosticListRepresentation getInstance() {
    return INSTANCE;
  }

  private TraceDiagnosticListRepresentation() {
    // Nothing to see here, move along now.
  }

  @Override
  public String toStringOf(@Nullable Object object) {
    if (object == null) {
      return "null";
    }

    @SuppressWarnings("unchecked")
    var diagnostics = (Collection>) object;

    return "\n" + diagnostics
        .stream()
        .map(TraceDiagnosticRepresentation.getInstance()::toStringOf)
        .map(this::indentAndBullet)
        .collect(joining("\n\n"));
  }

  private String indentAndBullet(String repr) {
    return " - " + repr.lines().collect(joining("\n   "));
  }
}