com.blitline.image.S3Location Maven / Gradle / Ivy
package com.blitline.image;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.apache.commons.lang3.Validate;
/**
* Value object representing an Amazon S3 location. An instance of this class may be used for the initial source image, any of the
* {@code src} parameters of the various functions, or a location to save to.
*
* @author Christopher Smith
*
*/
public class S3Location {
/**
* Pattern fragment matching a valid new-style S3 bucket name (3 to 63 DNS characters).
*/
public static final String S3_BUCKET_SUBPATTERN = "([\\w\\d\\._-]{3,63})";
/**
* Pattern matching a valid S3 bucket name ({@link #S3_BUCKET_SUBPATTERN} with start and end markers).
*/
public static final Pattern S3_BUCKET_PATTERN = Pattern.compile("\\A" + S3_BUCKET_SUBPATTERN + "\\z");
/**
* Pattern matching a valid S3 URL of the form {@literal s3://bucket-name/key/name}.
*/
public static final Pattern S3_URL_PATTERN = Pattern.compile("\\As3://" + S3_BUCKET_SUBPATTERN + "/(.+)\\z");
public final String bucket, key;
public S3Location(String bucket, String key) {
Validate.isTrue(S3_BUCKET_PATTERN.matcher(bucket).matches(), "bucket parameter is not a valid S3 bucket name");
this.bucket = bucket;
this.key = key;
}
public static S3Location of(String bucket, String key) {
return new S3Location(bucket, key);
}
public static S3Location of(String s3Url) {
Matcher m = S3_URL_PATTERN.matcher(s3Url);
Validate.isTrue(m.matches(), "s3Url is not a valid S3 URL");
return of(m.group(1), m.group(2));
}
public String getBucket() {
return bucket;
}
public String getKey() {
return key;
}
public String getName() {
return "s3";
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((bucket == null) ? 0 : bucket.hashCode());
result = prime * result + ((key == null) ? 0 : key.hashCode());
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (!(obj instanceof S3Location))
return false;
S3Location other = (S3Location) obj;
if (bucket == null) {
if (other.bucket != null)
return false;
} else if (!bucket.equals(other.bucket))
return false;
if (key == null) {
if (other.key != null)
return false;
} else if (!key.equals(other.key))
return false;
return true;
}
@Override
public String toString() {
return new StringBuilder("s3://").append(bucket).append('/').append(key).toString();
}
}