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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.StringReader;
import java.io.Writer;
import com.amazon.carbonado.FetchException;
import com.amazon.carbonado.PersistDeniedException;
import com.amazon.carbonado.PersistException;
/**
* Implementation of a Clob which is backed by a read-only String.
*
* @author Brian S O'Neill
*/
public class StringClob extends AbstractClob {
// TODO: Make this copy-on-write via internal CharArrayClob.
private final String mStr;
public StringClob(String str) {
mStr = str;
}
public Reader openReader() {
return new StringReader(mStr);
}
public Reader openReader(long pos) throws FetchException {
StringReader r = new StringReader(mStr);
try {
r.skip(pos);
} catch (IOException e) {
throw new FetchException(e);
}
return r;
}
public Reader openReader(long pos, int bufferSize) throws FetchException {
return openReader(pos);
}
public long getLength() throws FetchException {
return mStr.length();
}
@Override
public String asString() {
return mStr;
}
public Writer openWriter() throws PersistException {
throw denied();
}
public Writer openWriter(long pos) throws PersistException {
throw denied();
}
public Writer openWriter(long pos, int bufferSize) throws PersistException {
throw denied();
}
public void setLength(long length) throws PersistException {
throw denied();
}
@Override
public void setValue(String value) throws PersistException {
denied();
}
/**
* Always returns null.
*/
public Object getLocator() {
return null;
}
private PersistException denied() {
return new PersistDeniedException("Read-only");
}
}
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