/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF 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.io.internal;
import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;
import java.io.File;
import java.io.InputStream;
import java.io.IOException;
import javax.inject.Singleton;
import org.jclouds.io.Payload;
import org.jclouds.io.PayloadSlicer;
import org.jclouds.io.payloads.BaseMutableContentMetadata;
import org.jclouds.io.payloads.InputStreamPayload;
import org.jclouds.io.payloads.InputStreamSupplierPayload;
import com.google.common.base.Throwables;
import com.google.common.io.ByteStreams;
import com.google.common.io.Files;
import com.google.common.io.InputSupplier;
/**
*
* @author Adrian Cole
*/
@Singleton
public class BasePayloadSlicer implements PayloadSlicer {
/**
* {@inheritDoc}
*/
@Override
public Payload slice(Payload input, long offset, long length) {
checkNotNull(input);
checkArgument(offset >= 0, "offset is negative");
checkArgument(length >= 0, "length is negative");
Payload returnVal;
if (input.getRawContent() instanceof File) {
returnVal = doSlice((File) input.getRawContent(), offset, length);
} else if (input.getRawContent() instanceof String) {
returnVal = doSlice((byte[]) input.getRawContent(), offset, length);
} else if (input.getRawContent() instanceof byte[]) {
returnVal = doSlice((byte[]) input.getRawContent(), offset, length);
} else if (input.getRawContent() instanceof InputStream) {
returnVal = doSlice((InputStream) input.getRawContent(), offset, length);
} else {
returnVal = doSlice(input, offset, length);
}
return copyMetadataAndSetLength(input, returnVal, length);
}
protected Payload doSlice(Payload content, long offset, long length) {
return doSlice((InputSupplier<? extends InputStream>) content, offset, length);
}
protected Payload doSlice(String content, long offset, long length) {
return doSlice(content.getBytes(), offset, length);
}
protected Payload doSlice(File content, long offset, long length) {
return doSlice(Files.newInputStreamSupplier(content), offset, length);
}
protected Payload doSlice(InputStream content, long offset, long length) {
try {
ByteStreams.skipFully(content, offset);
} catch (IOException ioe) {
throw Throwables.propagate(ioe);
}
return new InputStreamPayload(ByteStreams.limit(content, length));
}
protected Payload doSlice(InputSupplier<? extends InputStream> content, long offset, long length) {
return new InputStreamSupplierPayload(ByteStreams.slice(content, offset, length));
}
protected Payload doSlice(byte[] content, long offset, long length) {
Payload returnVal;
checkArgument(offset <= Integer.MAX_VALUE, "offset is too big for an array");
checkArgument(length <= Integer.MAX_VALUE, "length is too big for an array");
returnVal = new InputStreamSupplierPayload(
ByteStreams.newInputStreamSupplier(content, (int) offset, (int) length));
return returnVal;
}
protected Payload copyMetadataAndSetLength(Payload input, Payload returnVal, long length) {
returnVal.setContentMetadata(BaseMutableContentMetadata.fromContentMetadata(input.getContentMetadata()
.toBuilder().contentLength(length).contentMD5(null).build()));
return returnVal;
}
}