org.apache.http.impl.client.cache.HeapResourceFactory Maven / Gradle / Ivy
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* to you under the Apache License, Version 2.0 (the
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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*/
package org.apache.http.impl.client.cache;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import org.apache.http.annotation.Contract;
import org.apache.http.annotation.ThreadingBehavior;
import org.apache.http.client.cache.InputLimit;
import org.apache.http.client.cache.Resource;
import org.apache.http.client.cache.ResourceFactory;
/**
* Generates {@link Resource} instances stored entirely in heap.
*
* @since 4.1
*/
@Contract(threading = ThreadingBehavior.IMMUTABLE)
public class HeapResourceFactory implements ResourceFactory {
@Override
public Resource generate(
final String requestId,
final InputStream inStream,
final InputLimit limit) throws IOException {
final ByteArrayOutputStream outStream = new ByteArrayOutputStream();
final byte[] buf = new byte[2048];
long total = 0;
int l;
while ((l = inStream.read(buf)) != -1) {
outStream.write(buf, 0, l);
total += l;
if (limit != null && total > limit.getValue()) {
limit.reached();
break;
}
}
return createResource(outStream.toByteArray());
}
@Override
public Resource copy(
final String requestId,
final Resource resource) throws IOException {
final byte[] body;
if (resource instanceof HeapResource) {
body = ((HeapResource) resource).getByteArray();
} else {
final ByteArrayOutputStream outStream = new ByteArrayOutputStream();
IOUtils.copyAndClose(resource.getInputStream(), outStream);
body = outStream.toByteArray();
}
return createResource(body);
}
Resource createResource(final byte[] buf) {
return new HeapResource(buf);
}
}