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The core HTTP and composition mechanisms of Ratpack
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/*
 * Copyright 2013 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 ratpack.path.internal;

import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Sets;
import ratpack.path.PathBinding;
import ratpack.path.PathTokens;

public class DefaultPathBinding implements PathBinding {

  private final String binding;
  private final String pastBinding;
  private final PathBinding parent;
  private final String description;

  private final PathTokens tokens;
  private final PathTokens allTokens;

  public DefaultPathBinding(String binding, ImmutableMap tokens, PathBinding parent, String description) {
    this.binding = binding;
    this.parent = parent;
    this.description = description;
    this.tokens = DefaultPathTokens.of(tokens);
    this.allTokens = mergeTokens(this.tokens, parent.getAllTokens());
    String bindingWithSlash = binding.concat("/");
    String path = parent.getPastBinding();
    if (path.equals(binding)) {
      pastBinding = "";
    } else if (path.startsWith(bindingWithSlash)) {
      pastBinding = path.substring(bindingWithSlash.length());
    } else {
      throw new IllegalArgumentException(String.format("Path '%s' is not a child of '%s'", path, binding));
    }
  }

  private static PathTokens mergeTokens(PathTokens thisTokens, PathTokens parentTokens) {
    if (parentTokens.isEmpty()) {
      return thisTokens;
    } else if (thisTokens.isEmpty()) {
      return parentTokens;
    } else {
      ImmutableMap.Builder builder = ImmutableMap.builder();
      Sets.difference(parentTokens.keySet(), thisTokens.keySet()).forEach(t ->
        builder.put(t, parentTokens.get(t))
      );
      builder.putAll(thisTokens);
      return DefaultPathTokens.of(builder.build());
    }
  }

  @Override
  public String getDescription() {
    return parent instanceof RootPathBinding ? description : parent.getDescription() + "/" + description;
  }

  @Override
  public String getPastBinding() {
    return pastBinding;
  }

  @Override
  public String getBoundTo() {
    return binding;
  }

  @Override
  public PathTokens getTokens() {
    return tokens;
  }

  @Override
  public boolean equals(Object o) {
    if (this == o) {
      return true;
    }
    if (o == null || getClass() != o.getClass()) {
      return false;
    }

    DefaultPathBinding that = (DefaultPathBinding) o;

    return binding.equals(that.binding)
      && pastBinding.equals(that.pastBinding)
      && description.equals(that.description)
      && allTokens.equals(that.allTokens);
  }

  @Override
  public int hashCode() {
    int result = binding.hashCode();
    result = 31 * result + pastBinding.hashCode();
    result = 31 * result + description.hashCode();
    result = 31 * result + allTokens.hashCode();
    return result;
  }

  @Override
  public PathTokens getAllTokens() {
    return allTokens;
  }
}