[jira] [Commented] (HTTPCORE-258) Add Offset and Length to ByteArrayEntity

["Sebb (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HTTPCORE-258?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13042849#comment-13042849 ] 

Sebb commented on HTTPCORE-258:
-------------------------------

Should off and len be final? Does it make sense to change them? Could they be private?

> Add Offset and Length to ByteArrayEntity
> ----------------------------------------
>
>                 Key: HTTPCORE-258
>                 URL: https://issues.apache.org/jira/browse/HTTPCORE-258
>             Project: HttpComponents HttpCore
>          Issue Type: Improvement
>          Components: HttpCore, HttpCore NIO
>         Environment: N/A
>            Reporter: William R. Speirs
>            Priority: Trivial
>             Fix For: 4.2-alpha1
>
>
> Currently the ByteArrayEntity only has a single constructor which will only accept a byte[]. I suggest this class be extended to handle an additional constructor which takes an offset and length. I have created the following first draft of a patch to the ByteArrayEntity class. Additional changes will need to be made to the test cases and the NByteArrayEntity class as well.
> --- httpcore/src/main/java/org/apache/http/entity/ByteArrayEntity.java  (revision 1130603)
> +++ httpcore/src/main/java/org/apache/http/entity/ByteArrayEntity.java  (working copy)
> @@ -40,6 +40,7 @@
>  public class ByteArrayEntity extends AbstractHttpEntity implements Cloneable {
>      protected final byte[] content;
> +    protected int off, len;
>      public ByteArrayEntity(final byte[] b) {
>          super();
> @@ -47,25 +48,43 @@
>              throw new IllegalArgumentException("Source byte array may not be null");
>          }
>          this.content = b;
> +       this.off = 0;
> +       this.len = this.content.length;
>      }
> +    public ByteArrayEntity(final byte[] b, int off, int len) {
> +        super();
> +        if (b == null) {
> +            throw new IllegalArgumentException("Source byte array may not be null");
> +        }
> +       if (off < 0) {
> +           throw new IllegalArgumentException("Offset cannot be negative");
> +       }
> +       if(b.length - off >= len) {
> +           throw new IllegalArgumentException("Length cannot be longer than byte array");
> +       }
> +        this.content = b;
> +       this.off = off;
> +       this.len = len;
> +    }
> +
>      public boolean isRepeatable() {
>          return true;
>      }
>      public long getContentLength() {
> -        return this.content.length;
> +        return this.len - this.off;
>      }
>      public InputStream getContent() {
> -        return new ByteArrayInputStream(this.content);
> +        return new ByteArrayInputStream(this.content, this.off, this.len);
>      }
>      public void writeTo(final OutputStream outstream) throws IOException {
>          if (outstream == null) {
>              throw new IllegalArgumentException("Output stream may not be null");
>          }
> -        outstream.write(this.content);
> +        outstream.write(this.content, this.off, this.len);
>          outstream.flush();
>      }

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