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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();
+ }
+
+ 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();
+ }
+
+ public void setValue(String value) throws PersistException {
+ denied();
+ }
+
+ private PersistException denied() {
+ return new PersistDeniedException("Read-only");
+ }
+}