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Ivy resolver for S3
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/*
 * Copyright 2004-2007 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 ohnosequences.ivy;

import java.io.InputStream;

import com.amazonaws.AmazonServiceException;
import com.amazonaws.services.s3.AmazonS3Client;
import com.amazonaws.services.s3.model.ObjectMetadata;
import org.apache.ivy.plugins.repository.Resource;


/**
 * A Resource implementation that extracts its data from an S3 resource.
 *
 * @author Ben Hale
 * @author Evdokim Kovach
 */
public class S3Resource implements Resource {

    private S3Repository s3Repo;

  private String bucket;

  private String key;

  private boolean exists;

  private long contentLength;

  private long lastModified;

  private String name;



  public S3Resource(S3Repository s3Repo, String uri) {
    this.s3Repo = s3Repo;
    initializeS3(uri);
    initalizeResource();
    this.name = uri;
  }

  public Resource clone(String newUri) {
    return new S3Resource(s3Repo, newUri);
  }

  public boolean exists() {
    return exists;
  }

  public long getContentLength() {
    return contentLength;
  }

  public long getLastModified() {
    return lastModified;
  }

  public String getName() {
    return name;
  }

  public boolean isLocal() {
    return false;
  }

  public InputStream openStream() {
    try {
            return s3Repo.getS3Client().getObject(bucket, key).getObjectContent();
    }
    catch (AmazonServiceException e) {
      throw new S3RepositoryException(e);
    }
  }

  private void initializeS3(String uri) {
    this.bucket = S3Utils.getBucket(uri);
    this.key = S3Utils.getKey(uri);
  }

  private void initalizeResource() {
    try {
      // System.out.println("trying to resolve bucket=" + bucket + " key=" + key);
      ObjectMetadata metadata = s3Repo.getS3Client().getObjectMetadata(bucket, key);

      this.exists = true;
      this.contentLength = metadata.getContentLength();
      this.lastModified = metadata.getLastModified().getTime();

    }
    catch (AmazonServiceException e) {
      this.exists = false;
      this.contentLength = 0;
      this.lastModified = 0;
      this.name = "";
    }
  }

}