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A driver for DataStax Enterprise (DSE) and Apache Cassandra 1.2+ clusters that works exclusively with the Cassandra Query Language version 3 (CQL3) and Cassandra's binary protocol, supporting DSE-specific features such as geospatial types, DSE Graph and DSE authentication.

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/*
 * Copyright DataStax, Inc.
 *
 * This software can be used solely with DataStax Enterprise. Please consult the license at
 * http://www.datastax.com/terms/datastax-dse-driver-license-terms
 */
package com.datastax.driver.dse.graph;

import com.google.common.base.Function;
import com.google.common.base.Objects;
import com.google.common.collect.Lists;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.Set;

class DefaultPath implements Path {

  private static final Function, Set> TO_UNMODIFIABLE_SET =
      new Function, Set>() {
        @Override
        public Set apply(Set input) {
          return Collections.unmodifiableSet(input);
        }
      };

  List> labels;

  List objects;

  DefaultPath() {}

  @Override
  public List> getLabels() {
    return labels == null || labels.isEmpty()
        ? Collections.>emptyList()
        : Collections.unmodifiableList(Lists.transform(labels, TO_UNMODIFIABLE_SET));
  }

  @Override
  public List getObjects() {
    return objects == null || objects.isEmpty()
        ? Collections.emptyList()
        : Collections.unmodifiableList(objects);
  }

  @Override
  public int size() {
    return objects == null ? 0 : objects.size();
  }

  @Override
  public GraphNode getObject(int index) {
    if (index < 0 || index >= size()) return null;
    return getObjects().get(index);
  }

  @Override
  public GraphNode getObject(String label) {
    List objects = getObjects(label);
    return objects.isEmpty() ? null : objects.get(0);
  }

  @Override
  public List getObjects(String label) {
    List objects = Lists.newArrayListWithExpectedSize(1);
    List> labels = getLabels();
    for (int i = 0; i < labels.size(); i++) {
      if (labels.get(i).contains(label)) {
        objects.add(getObject(i));
      }
    }
    return Collections.unmodifiableList(objects);
  }

  @Override
  public boolean hasLabel(String label) {
    for (Set labelGroup : getLabels()) {
      if (labelGroup.contains(label)) return true;
    }
    return false;
  }

  @Override
  public Iterator iterator() {
    return getObjects().iterator();
  }

  @Override
  public boolean equals(Object o) {
    if (this == o) return true;
    if (!(o instanceof Path)) return false;
    Path that = (Path) o;
    return Objects.equal(getLabels(), that.getLabels())
        && Objects.equal(getObjects(), that.getObjects());
  }

  @Override
  public int hashCode() {
    // getLabels() deliberately left out for faster hashcodes
    return Objects.hashCode(getObjects());
  }

  @Override
  public String toString() {
    return "Path{" + "labels=" + getLabels() + ", objects=" + getObjects() + '}';
  }
}