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/*
* Copyright 2006-2010 Amazon Technologies, Inc. or its affiliates.
* Amazon, Amazon.com and Carbonado are trademarks or registered trademarks
* of Amazon Technologies, Inc. or its affiliates. All rights reserved.
*
* 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 com.amazon.carbonado.lob;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.charset.Charset;
import java.nio.charset.IllegalCharsetNameException;
import com.amazon.carbonado.FetchException;
import com.amazon.carbonado.PersistException;
/**
* Provides access to BLOBs, which are Binary Large OBjects. Consider accessing
* Blobs within a {@link com.amazon.carbonado.Transaction transaction} scope,
* to prevent unexpected updates.
*
* @author Brian S O'Neill
* @see Clob
*/
public interface Blob extends Lob {
/**
* Returns an InputStream for reading Blob data positioned at the
* start. The Blob implementation selects an appropriate buffer size for
* the stream.
*
* @return InputStream for this Blob, which is not guaranteed to be thread-safe
* @throws IllegalArgumentException if position is negative
*/
InputStream openInputStream() throws FetchException;
/**
* Returns an InputStream for reading Blob data. The Blob implementation
* selects an appropriate buffer size for the stream.
*
* @param pos desired zero-based position to read from
* @return InputStream for this Blob, which is not guaranteed to be thread-safe
* @throws IllegalArgumentException if position is negative
*/
InputStream openInputStream(long pos) throws FetchException;
/**
* Returns an InputStream for reading Blob data. A suggested buffer size
* must be provided, but it might be ignored by the Blob implementation.
*
* @param pos desired zero-based position to read from
* @param bufferSize suggest that the input stream buffer be at least this large (in bytes)
* @return InputStream for this Blob, which is not guaranteed to be thread-safe
* @throws IllegalArgumentException if position is negative
*/
InputStream openInputStream(long pos, int bufferSize) throws FetchException;
/**
* Returns the length of this Blob, in bytes.
*/
long getLength() throws FetchException;
/**
* Convenience method to capture all the Blob data as a single String,
* assuming UTF-8 encoding. Call within a transaction scope to ensure the
* data does not change while the String is being built.
*
* @throws IllegalArgumentException if resulting String length would be
* greater than Integer.MAX_VALUE
* @throws OutOfMemoryError if not enough memory to hold Blob as a single String
*/
String asString() throws FetchException;
/**
* Convenience method to capture all the Blob data as a single String,
* decoded against the given charset. Call within a transaction scope to
* ensure the data does not change while the String is being built.
*
* @param charsetName name of character set to decode String
* @throws IllegalCharsetNameException if the given charset name is illegal
* @throws IllegalArgumentException if resulting String length would be
* greater than Integer.MAX_VALUE
* @throws OutOfMemoryError if not enough memory to hold Blob as a single String
*/
String asString(String charsetName) throws FetchException;
/**
* Convenience method to capture all the Blob data as a single String,
* decoded against the given charset. Call within a transaction scope to
* ensure the data does not change while the String is being built.
*
* @param charset character set to decode String
* @throws IllegalArgumentException if resulting String length would be
* greater than Integer.MAX_VALUE
* @throws OutOfMemoryError if not enough memory to hold Blob as a single String
*/
String asString(Charset charset) throws FetchException;
/**
* Returns an OutputStream for writing Blob data, positioned at the
* start. The Blob implementation selects an appropriate buffer size for
* the stream.
*
* @return OutputStream for this Blob, which is not guaranteed to be thread-safe
* @throws IllegalArgumentException if position is negative
*/
OutputStream openOutputStream() throws PersistException;
/**
* Returns an OutputStream for writing Blob data. The Blob implementation
* selects an appropriate buffer size for the stream.
*
* @param pos desired zero-based position to write to
* @return OutputStream for this Blob, which is not guaranteed to be thread-safe
* @throws IllegalArgumentException if position is negative
*/
OutputStream openOutputStream(long pos) throws PersistException;
/**
* Returns an OutputStream for writing Blob data. A suggested buffer size
* must be provided, but it might be ignored by the Blob implementation.
*
* @param pos desired zero-based position to write to
* @param bufferSize suggest that the output stream buffer be at least this large (in bytes)
* @return OutputStream for this Blob, which is not guaranteed to be thread-safe
* @throws IllegalArgumentException if position is negative
*/
OutputStream openOutputStream(long pos, int bufferSize) throws PersistException;
/**
* Set the length of this Blob, in bytes. If the new length is shorter, the
* Blob is truncated. If the new length is longer, the Blob is padded with
* zeros.
*
* @param length new length to set to
* @throws IllegalArgumentException if length is negative
* @throws com.amazon.carbonado.PersistDeniedException if Blob is read-only
*/
void setLength(long length) throws PersistException;
/**
* Convenience method to overwrite all Blob data with the value of a single
* String, applying UTF-8 encoding. The Blob length may grow or shrink, to
* match the encoded String value. Call within a transaction scope to
* ensure the data and length does not change while the value is set.
*
* @param value Blob is overwritten with this value
* @throws IllegalArgumentException if value is null
*/
void setValue(String value) throws PersistException;
/**
* Convenience method to overwrite all Blob data with the value of a single
* String, applying the given charset encoding. The Blob length may grow or
* shrink, to match the encoded String value. Call within a transaction
* scope to ensure the data and length does not change while the value is
* set.
*
* @param value Blob is overwritten with this value
* @param charsetName name of character set to encode String
* @throws IllegalCharsetNameException if the given charset name is illegal
* @throws IllegalArgumentException if value is null
*/
void setValue(String value, String charsetName) throws PersistException;
/**
* Convenience method to overwrite all Blob data with the value of a single
* String, applying the given charset encoding. The Blob length may grow or
* shrink, to match the encoded String value. Call within a transaction
* scope to ensure the data and length does not change while the value is
* set.
*
* @param value Blob is overwritten with this value
* @param charset character set to encode String
* @throws IllegalArgumentException if value is null
*/
void setValue(String value, Charset charset) throws PersistException;
}
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