UnexpectedCompilerFailureException.java

/*
 * Copyright 2015 Google 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.google.template.soy.jbcsrc;

import com.google.template.soy.base.SourceLocation;
import com.google.template.soy.basetree.Node;
import java.util.ArrayDeque;
import java.util.Deque;

/**
 * A wrapper for an unexpected compilation failure. Allows for associating unexpected errors with
 * the soy source locations that led to them.
 */
final class UnexpectedCompilerFailureException extends RuntimeException {
  private final Deque<Node> compilationPath = new ArrayDeque<>();

  UnexpectedCompilerFailureException(Node original, Throwable cause) {
    super("unexpected compile failure", cause, false, false);
    compilationPath.add(original);
  }

  void addLocation(Node sourceLocation) {
    compilationPath.add(sourceLocation);
  }

  SourceLocation getOriginalLocation() {
    return compilationPath.getFirst().getSourceLocation();
  }

  String printSoyStack() {
    StringBuilder sb = new StringBuilder();
    for (Node node : compilationPath) {
      sb.append(node.getClass().getSimpleName())
          .append(": ")
          .append(node.getSourceLocation())
          .append("\n");
    }
    // delete last \n
    return sb.deleteCharAt(sb.length() - 1).toString();
  }

  @Override
  public String getMessage() {
    return super.getMessage() + "\nwhile compiling:\n" + printSoyStack();
  }
}