com.caucho.db.sql.ParamExpr Maven / Gradle / Ivy
/*
* Copyright (c) 1998-2018 Caucho Technology -- all rights reserved
*
* This file is part of Resin(R) Open Source
*
* Each copy or derived work must preserve the copyright notice and this
* notice unmodified.
*
* Resin Open Source is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Resin Open Source is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
* of NON-INFRINGEMENT. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with Resin Open Source; if not, write to the
*
* Free Software Foundation, Inc.
* 59 Temple Place, Suite 330
* Boston, MA 02111-1307 USA
*
* @author Scott Ferguson
*/
package com.caucho.db.sql;
import java.io.InputStream;
import java.sql.SQLException;
import java.util.ArrayList;
import com.caucho.util.Hex;
class ParamExpr extends Expr {
private static final int NULL = 0;
private static final int BOOLEAN = NULL + 1;
private static final int STRING = BOOLEAN + 1;
private static final int LONG = STRING + 1;
private static final int DOUBLE = LONG + 1;
private static final int DATE = DOUBLE + 1;
private static final int BINARY = DATE + 1;
private static final int BYTES = BINARY + 1;
private final int _index;
/*
private int _type = NULL;
private String _stringValue;
private long _longValue;
private double _doubleValue;
private InputStream _binaryStream;
private int _streamLength;
private byte []_bytes;
*/
ParamExpr(int index)
{
_index = index + 1;
}
/**
* Returns the type of the expression.
*/
public Class getType()
{
return Object.class;
/*
switch (_type) {
case NULL:
return Object.class;
case BOOLEAN:
return boolean.class;
case STRING:
return String.class;
case LONG:
return long.class;
case DOUBLE:
return double.class;
case DATE:
return java.util.Date.class;
case BINARY:
return java.io.InputStream.class;
case BYTES:
return byte[].class;
default:
return Object.class;
}
*/
}
/**
* Returns true for a parameter expression.
*/
@Override
public boolean isParam()
{
return true;
}
/**
* XXX: Since we're only using this database internally, we can guarantee
* non-null for parameters.
*/
@Override
public boolean isNullable()
{
return false;
}
/**
* Returns the subcost based on the given FromList.
*/
public long subCost(ArrayList fromList)
{
return 0;
}
/**
* Clears the value.
*/
public void clear()
{
// _type = NULL;
}
/**
* Sets the value as a string.
*/
/*
public void setString(String value)
{
if (value == null)
_type = NULL;
else {
_type = STRING;
_stringValue = value;
}
}
*/
/**
* Sets the value as a boolean.
*/
/*
public void setBoolean(boolean value)
{
_type = BOOLEAN;
_longValue = value ? 1 : 0;
}
*/
/**
* Sets the value as a long.
*/
/*
public void setLong(long value)
{
_type = LONG;
_longValue = value;
}
*/
/**
* Sets the value as a double.
*/
/*
public void setDouble(double value)
{
_type = DOUBLE;
_doubleValue = value;
}
*/
/**
* Sets the value as a date.
*/
/*
public void setDate(long value)
{
_type = DATE;
_longValue = value;
}
*/
/**
* Sets the value as a stream.
*/
/*
public void setBinaryStream(InputStream is, int length)
{
_type = BINARY;
_binaryStream = is;
_streamLength = length;
}
*/
/**
* Sets the value as a stream.
*/
/*
public void setBytes(byte []bytes)
{
_type = BYTES;
_bytes = bytes;
}
*/
/**
* Checks if the value is null
*
* @param rows the current database tuple
*
* @return the string value
*/
@Override
public boolean isBinaryStream(QueryContext context)
{
return context.isBinaryStream(_index);
}
/**
* Checks if the value is null
*
* @param rows the current database tuple
*
* @return the string value
*/
@Override
public boolean isNull(QueryContext context)
throws SQLException
{
return context.isNull(_index);
}
/**
* Evaluates the expression as a string.
*
* @param rows the current database tuple
*
* @return the string value
*/
@Override
public String evalString(QueryContext context)
throws SQLException
{
return context.getString(_index);
/*
switch (_type) {
case NULL:
return null;
case BOOLEAN:
return _longValue != 0 ? "1" : "0";
case STRING:
return _stringValue;
case LONG:
return String.valueOf(_longValue);
case DATE:
return QDate.formatISO8601(_longValue);
case DOUBLE:
return String.valueOf(_doubleValue);
case BYTES:
{
StringBuilder sb = new StringBuilder();
int len = _bytes.length;
for (int i = 0; i < len; i++) {
sb.append((char) (_bytes[i] & 0xff));
}
return sb.toString();
}
default:
throw new UnsupportedOperationException(String.valueOf(_type));
}
*/
}
/**
* Evaluates the expression as a boolean.
*
* @param rows the current database tuple
*
* @return the boolean value
*/
public int evalBoolean(QueryContext context)
throws SQLException
{
return context.getBoolean(_index);
/*
switch (_type) {
case NULL:
return UNKNOWN;
case BOOLEAN:
case LONG:
return _longValue != 0 ? TRUE : FALSE;
case DOUBLE:
return _doubleValue != 0 ? TRUE : FALSE;
default:
throw new UnsupportedOperationException();
}
*/
}
/**
* Evaluates the expression as a long.
*
* @param rows the current database tuple
*
* @return the long value
*/
@Override
public long evalLong(QueryContext context)
throws SQLException
{
return context.getLong(_index);
/*
switch (_type) {
case NULL:
return 0;
case BOOLEAN:
case LONG:
case DATE:
return _longValue;
case DOUBLE:
return (long) _doubleValue;
case STRING:
return Long.parseLong(_stringValue);
default:
throw new UnsupportedOperationException("" + _type);
}
*/
}
/**
* Evaluates the expression as a double.
*
* @param rows the current database tuple
*
* @return the double value
*/
@Override
public double evalDouble(QueryContext context)
throws SQLException
{
return context.getDouble(_index);
/*
switch (_type) {
case NULL:
return 0;
case LONG:
case DATE:
return _longValue;
case DOUBLE:
return _doubleValue;
case STRING:
return Double.parseDouble(_stringValue);
default:
throw new UnsupportedOperationException(_index + ":" + _type + " " + toString());
}
*/
}
/**
* Evaluates the expression as a date
*
* @param rows the current database tuple
*
* @return the date value
*/
@Override
public long evalDate(QueryContext context)
throws SQLException
{
return context.getDate(_index);
/*
switch (_type) {
case NULL:
return 0;
case LONG:
case DATE:
return _longValue;
case DOUBLE:
return (long) _doubleValue;
default:
throw new UnsupportedOperationException();
}
*/
}
/**
* Evaluates the expression as a stream.
*
* @param rows the current database tuple
*
* @return the string value
*/
@Override
public byte []evalBytes(QueryContext context)
throws SQLException
{
return context.getBytes(_index);
/*
switch (_type) {
case NULL:
return null;
case BINARY:
return _binaryStream;
default:
throw new UnsupportedOperationException();
}
*/
}
@Override
public InputStream evalStream(QueryContext context)
{
return context.getBinaryStream(_index);
}
/**
* Evaluates the expression to a buffer
*
* @param result the result buffer
*
* @return the length of the result
* @throws SQLException
*/
/*
public int evalToBuffer(QueryContext context,
byte []buffer,
int offset)
throws SQLException
{
// context.evalToBuffer(_index, buffer, offset);
throw new UnsupportedOperationException(getClass().getName());
}
*/
@Override
public int evalToBuffer(QueryContext context, byte []buffer, int offset)
throws SQLException
{
try {
byte []bytes = evalBytes(context);
if (bytes == null)
return 0;
System.arraycopy(bytes, 0, buffer, offset, bytes.length);
return bytes.length;
} catch (UnsupportedOperationException e) {
throw new UnsupportedOperationException(this + " " + e.getMessage(), e);
}
}
public String toString()
{
return "?" + _index;
}
}
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