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/*
* Copyright 2006 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.IOException;
import java.io.Reader;
import java.io.Writer;
import com.amazon.carbonado.FetchException;
import com.amazon.carbonado.PersistException;
import com.amazon.carbonado.Repository;
import com.amazon.carbonado.Transaction;
/**
* AbstractClob implements a small set of common Clob methods.
*
* @author Brian S O'Neill
*/
public abstract class AbstractClob implements Clob {
static FetchException toFetchException(IOException e) {
Throwable cause = e.getCause();
if (cause instanceof FetchException) {
return (FetchException) cause;
}
if (cause == null) {
cause = e;
}
return new FetchException(cause);
}
static PersistException toPersistException(IOException e) {
Throwable cause = e.getCause();
if (cause instanceof PersistException) {
return (PersistException) cause;
}
if (cause == null) {
cause = e;
}
return new PersistException(cause);
}
private final Repository mRepo;
protected AbstractClob() {
mRepo = null;
}
/**
* Use of this constructor indicates that setValue should operate within a
* transaction. A Repository is passed in for entering the transaction.
*
* @param repo optional repository to use for performing string conversion
* within transactions
*/
protected AbstractClob(Repository repo) {
mRepo = repo;
}
public String asString() throws FetchException {
Transaction txn = mRepo == null ? null : mRepo.enterTransaction();
try {
long length = getLength();
if (length > Integer.MAX_VALUE) {
throw new IllegalArgumentException
("Clob is too long to fit in a String: " + length);
}
int iLen = (int) length;
if (iLen <= 0) {
return "";
}
try {
Reader r = openReader();
try {
char[] buf = new char[iLen];
int offset = 0;
int amt;
while ((amt = r.read(buf, offset, iLen - offset)) > 0) {
offset += amt;
}
if (offset <= 0) {
return "";
}
return new String(buf, 0, offset);
} finally {
r.close();
}
} catch (IOException e) {
throw toFetchException(e);
}
} finally {
if (txn != null) {
try {
txn.exit();
} catch (PersistException e) {
// Don't care.
}
}
}
}
public void setValue(String value) throws PersistException {
if (value == null) {
throw new IllegalArgumentException("Clob value cannot be null");
}
if (mRepo == null) {
setLength(0);
try {
Writer w = openWriter();
w.write(value);
w.close();
} catch (IOException e) {
throw toPersistException(e);
}
} else {
Transaction txn = mRepo.enterTransaction();
try {
long originalLength = getLength();
try {
Writer w = openWriter();
try {
w.write(value);
} finally {
w.close();
}
} catch (IOException e) {
throw toPersistException(e);
}
if (value.length() < originalLength) {
// Truncate.
setLength(value.length());
}
txn.commit();
} catch (FetchException e) {
throw e.toPersistException();
} finally {
txn.exit();
}
}
}
}
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