/*
* Copyright 2002-2010 the original author or authors.
*
* 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 org.springframework.jdbc.support.lob;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.Reader;
import java.io.StringReader;
import java.io.UnsupportedEncodingException;
import java.io.Writer;
import java.sql.Clob;
import java.sql.SQLException;
import org.springframework.util.FileCopyUtils;
/**
* Simple JDBC {@link Clob} adapter that exposes a given String or character stream.
* Optionally used by {@link DefaultLobHandler}.
*
* @author Juergen Hoeller
* @since 2.5.3
*/
class PassThroughClob implements Clob {
private String content;
private Reader characterStream;
private InputStream asciiStream;
private long contentLength;
public PassThroughClob(String content) {
this.content = content;
this.contentLength = content.length();
}
public PassThroughClob(Reader characterStream, long contentLength) {
this.characterStream = characterStream;
this.contentLength = contentLength;
}
public PassThroughClob(InputStream asciiStream, long contentLength) {
this.asciiStream = asciiStream;
this.contentLength = contentLength;
}
public long length() throws SQLException {
return this.contentLength;
}
public Reader getCharacterStream() throws SQLException {
try {
if (this.content != null) {
return new StringReader(this.content);
}
else if (this.characterStream != null) {
return this.characterStream;
}
else {
return new InputStreamReader(this.asciiStream, "US-ASCII");
}
}
catch (UnsupportedEncodingException ex) {
throw new SQLException("US-ASCII encoding not supported: " + ex);
}
}
public InputStream getAsciiStream() throws SQLException {
try {
if (this.content != null) {
return new ByteArrayInputStream(this.content.getBytes("US-ASCII"));
}
else if (this.characterStream != null) {
String tempContent = FileCopyUtils.copyToString(this.characterStream);
return new ByteArrayInputStream(tempContent.getBytes("US-ASCII"));
}
else {
return this.asciiStream;
}
}
catch (UnsupportedEncodingException ex) {
throw new SQLException("US-ASCII encoding not supported: " + ex);
}
catch (IOException ex) {
throw new SQLException("Failed to read stream content: " + ex);
}
}
public Reader getCharacterStream(long pos, long length) throws SQLException {
throw new UnsupportedOperationException();
}
public Writer setCharacterStream(long pos) throws SQLException {
throw new UnsupportedOperationException();
}
public OutputStream setAsciiStream(long pos) throws SQLException {
throw new UnsupportedOperationException();
}
public String getSubString(long pos, int length) throws SQLException {
throw new UnsupportedOperationException();
}
public int setString(long pos, String str) throws SQLException {
throw new UnsupportedOperationException();
}
public int setString(long pos, String str, int offset, int len) throws SQLException {
throw new UnsupportedOperationException();
}
public long position(String searchstr, long start) throws SQLException {
throw new UnsupportedOperationException();
}
public long position(Clob searchstr, long start) throws SQLException {
throw new UnsupportedOperationException();
}
public void truncate(long len) throws SQLException {
throw new UnsupportedOperationException();
}
public void free() throws SQLException {
// no-op
}
}
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