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StripeInformation.java
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88 lines (77 loc) · 2.56 KB
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/*
* 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.apache.orc;
/**
* Information about the stripes in an ORC file that is provided by the Reader.
* @since 1.1.0
*/
public interface StripeInformation {
/**
* Get the byte offset of the start of the stripe.
* @return the bytes from the start of the file
*/
long getOffset();
/**
* Get the total length of the stripe in bytes.
* @return the number of bytes in the stripe
*/
long getLength();
/**
* Get the length of the stripe's indexes.
* @return the number of bytes in the index
*/
long getIndexLength();
/**
* Get the length of the stripe's data.
* @return the number of bytes in the stripe
*/
long getDataLength();
/**
* Get the length of the stripe's tail section, which contains its index.
* @return the number of bytes in the tail
*/
long getFooterLength();
/**
* Get the number of rows in the stripe.
* @return a count of the number of rows
*/
long getNumberOfRows();
/**
* Get the index of this stripe in the current file.
* @return 0 to number_of_stripes - 1
*/
long getStripeId();
/**
* Does this stripe have an explicit encryption stripe id set?
* @return true if this stripe was the first stripe of a merge
*/
boolean hasEncryptionStripeId();
/**
* Get the original stripe id that was used when the stripe was originally
* written. This is only different that getStripeId in merged files.
* @return the original stripe id + 1
*/
long getEncryptionStripeId();
/**
* Get the encrypted keys starting from this stripe until overridden by
* a new set in a following stripe. The top level array is one for each
* encryption variant. Each element is an encrypted key.
* @return the array of encrypted keys
*/
byte[][] getEncryptedLocalKeys();
}