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/**
 * Licensed to jclouds, Inc. (jclouds) under one or more
 * contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  jclouds licenses this file
 * to you 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 org.jclouds.domain;

import static com.google.common.base.Preconditions.checkNotNull;

import java.net.URI;
import java.util.List;

import org.jclouds.util.Strings2;

import com.google.common.base.Splitter;
import com.google.common.collect.Lists;

/**
 * @author Adrian Cole
 */
public class Credentials {

   public static class Builder {
      private String identity;
      private String credential;

      public Builder identity(String identity) {
         this.identity = identity;
         return this;
      }

      public Builder credential(String credential) {
         this.credential = credential;
         return this;
      }

      @SuppressWarnings("unchecked")
      public T build() {
         return (T) new Credentials(identity, credential);
      }
   }

   public final String identity;
   public final String credential;

   public Credentials(String identity, String credential) {
      this.identity = identity;
      this.credential = credential;
   }

   public static Credentials parse(URI uri) {
      checkNotNull(uri, "uri");
      List userInfo = Lists.newArrayList(Splitter.on(':').split(
            checkNotNull(uri.getUserInfo(), "no userInfo in " + uri)));
      String identity = checkNotNull(userInfo.get(0), "no username in " + uri.getUserInfo());
      if (Strings2.isUrlEncoded(identity)) {
         identity = Strings2.urlDecode(identity);
      }
      String credential = userInfo.size() > 1 ? userInfo.get(1) : null;
      if (credential != null && Strings2.isUrlEncoded(credential)) {
         credential = Strings2.urlDecode(credential);
      }
      return new Credentials(identity, credential);
   }

   public Builder toBuilder() {
      return new Builder().identity(identity).credential(credential);
   }

   @Override
   public int hashCode() {
      final int prime = 31;
      int result = 1;
      result = prime * result + ((credential == null) ? 0 : credential.hashCode());
      result = prime * result + ((identity == null) ? 0 : identity.hashCode());
      return result;
   }

   @Override
   public boolean equals(Object obj) {
      if (this == obj)
         return true;
      if (obj == null)
         return false;
      if (!(obj instanceof Credentials))
         return false;
      Credentials other = (Credentials) obj;
      if (credential == null) {
         if (other.credential != null)
            return false;
      } else if (!credential.equals(other.credential))
         return false;
      if (identity == null) {
         if (other.identity != null)
            return false;
      } else if (!identity.equals(other.identity))
         return false;
      return true;
   }

}