clobimpl.java

Speedframework--基于类型元数据的羽量级ORM.完全基于Java类型元数据和反射机制同时不需要任何对象关系映射配置文件的轻量级ORM框架,它充分利用了类型本身的信息,使用Metadata

package org.speedframework.entity;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.Reader;
import java.io.StringReader;
import java.io.Writer;
import java.sql.Clob;
import java.sql.SQLException;

/**
 * Clob 类型实现
 * @author lizf
 *
 */
public class ClobImpl implements Clob {
	
	private Reader reader;
	private int length;
	private boolean needsReset = false;

	public ClobImpl(String string) {
		reader = new StringReader(string);
		length = string.length();
	}

	public ClobImpl(Reader reader, int length) {
		this.reader = reader;
		this.length = length;
	}


	public long length() throws SQLException {
		return length;
	}

	public void truncate(long len) throws SQLException {

	}

	public InputStream getAsciiStream() throws SQLException {
		try {
			if (needsReset) reader.reset();
		}
		catch (IOException ioe) {
			throw new SQLException("could not reset reader");
		}
		needsReset = true;		
		return new ByteArrayInputStream(reader.toString().getBytes());
	}

	public OutputStream setAsciiStream(long pos) throws SQLException {
		return null;
	}

	public Reader getCharacterStream() throws SQLException {
		try {
			if (needsReset) reader.reset();
		}
		catch (IOException ioe) {
			throw new SQLException("could not reset reader");
		}
		needsReset = true;
		return reader;
	}

	public Writer setCharacterStream(long pos) throws SQLException {
		return null;
	}

	public String getSubString(long pos, int length) throws SQLException {
		return null;
	}

	public int setString(long pos, String str) throws SQLException {
		return 0;
	}

	public int setString(long pos, String str, int offset, int len)
			throws SQLException {
		return 0;
	}

	public long position(String searchstr, long start) throws SQLException {
		return 0;
	}

	public long position(Clob searchstr, long start) throws SQLException {
		return 0;
	}

}