/*
 * Copyright 2002-2017 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.Writer;
import java.nio.charset.StandardCharsets;
import java.sql.Clob;
import java.sql.SQLException;

import org.springframework.lang.Nullable;
import org.springframework.util.FileCopyUtils;
import org.springframework.util.StreamUtils;

Simple JDBC Clob adapter that exposes a given String or character stream. Optionally used by DefaultLobHandler.
Author:Juergen Hoeller
Since:2.5.3
/** * 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 { @Nullable private String content; @Nullable private Reader characterStream; @Nullable 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; } @Override public long length() throws SQLException { return this.contentLength; } @Override public Reader getCharacterStream() throws SQLException { if (this.content != null) { return new StringReader(this.content); } else if (this.characterStream != null) { return this.characterStream; } else { return new InputStreamReader( (this.asciiStream != null ? this.asciiStream : StreamUtils.emptyInput()), StandardCharsets.US_ASCII); } } @Override public InputStream getAsciiStream() throws SQLException { try { if (this.content != null) { return new ByteArrayInputStream(this.content.getBytes(StandardCharsets.US_ASCII)); } else if (this.characterStream != null) { String tempContent = FileCopyUtils.copyToString(this.characterStream); return new ByteArrayInputStream(tempContent.getBytes(StandardCharsets.US_ASCII)); } else { return (this.asciiStream != null ? this.asciiStream : StreamUtils.emptyInput()); } } catch (IOException ex) { throw new SQLException("Failed to read stream content: " + ex); } } @Override public Reader getCharacterStream(long pos, long length) throws SQLException { throw new UnsupportedOperationException(); } @Override public Writer setCharacterStream(long pos) throws SQLException { throw new UnsupportedOperationException(); } @Override public OutputStream setAsciiStream(long pos) throws SQLException { throw new UnsupportedOperationException(); } @Override public String getSubString(long pos, int length) throws SQLException { throw new UnsupportedOperationException(); } @Override public int setString(long pos, String str) throws SQLException { throw new UnsupportedOperationException(); } @Override public int setString(long pos, String str, int offset, int len) throws SQLException { throw new UnsupportedOperationException(); } @Override public long position(String searchstr, long start) throws SQLException { throw new UnsupportedOperationException(); } @Override public long position(Clob searchstr, long start) throws SQLException { throw new UnsupportedOperationException(); } @Override public void truncate(long len) throws SQLException { throw new UnsupportedOperationException(); } @Override public void free() throws SQLException { // no-op } }