/*
* $RCSfile: DataBufferUtils.java,v $
*
* Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
*
* Use is subject to license terms.
*
* $Revision: 1.1 $
* $Date: 2005/02/11 04:57:00 $
* $State: Exp $
*/
package com.lightcrafts.media.jai.codecimpl.util;
import java.awt.image.DataBuffer;
import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
/**
* Utility class to enable compatibility with Java 2 1.4 real-valued
* DataBuffer classes. Factory methods and data array accessors are
* defined to use reflection. The core Java classes are given precedence
* over their JAI equivalents.
*/
public final class DataBufferUtils {
/**
* Priority ordered array of DataBufferFloat class names.
*/
private static final String[] FLOAT_CLASS_NAMES = {
"java.awt.image.DataBufferFloat",
"com.lightcrafts.mediax.jai.DataBufferFloat",
"com.lightcrafts.media.jai.codecimpl.util.DataBufferFloat"
};
/**
* Priority ordered array of DataBufferDouble class names.
*/
private static final String[] DOUBLE_CLASS_NAMES = {
"java.awt.image.DataBufferDouble",
"com.lightcrafts.mediax.jai.DataBufferDouble",
"com.lightcrafts.media.jai.codecimpl.util.DataBufferDouble"
};
/**
* Classes to be used for DB float and double.
*/
private static Class floatClass = null;
private static Class doubleClass = null;
/**
* Initialize float and double DB classes.
*/
static {
floatClass = getDataBufferClass(DataBuffer.TYPE_FLOAT);
doubleClass = getDataBufferClass(DataBuffer.TYPE_DOUBLE);
}
/**
* Return the class for the specified data type.
*
* @param dataType The data type from among
* <code>DataBuffer.TYPE_*</code>.
*/
private static final Class getDataBufferClass(int dataType) {
// Set the array of class names.
String[] classNames = null;
switch(dataType) {
case DataBuffer.TYPE_FLOAT:
classNames = FLOAT_CLASS_NAMES;
break;
case DataBuffer.TYPE_DOUBLE:
classNames = DOUBLE_CLASS_NAMES;
break;
default:
throw new IllegalArgumentException("dataType == "+dataType+"!");
}
// Initialize the return value.
Class dataBufferClass = null;
// Loop over the class names array in priority order.
for(int i = 0; i < classNames.length; i++) {
try {
// Attempt to get the class.
dataBufferClass = Class.forName(classNames[i]);
// Break if the class was found.
if(dataBufferClass != null) {
break;
}
} catch(ClassNotFoundException e) {
// Ignore the exception.
}
}
// Throw an exception if no class was found.
if(dataBufferClass == null) {
throw new RuntimeException
(JaiI18N.getString("DataBufferUtils0")+" "+
(String)(dataType == DataBuffer.TYPE_FLOAT ?
"DataBufferFloat" : "DataBufferDouble"));
}
return dataBufferClass;
}
/**
* Construct a <code>DataBuffer</code> of the requested type
* using the parameters with the specified types and values.
*/
private static final DataBuffer constructDataBuffer(int dataType,
Class[] paramTypes,
Object[] paramValues) {
Class dbClass = null;
switch(dataType) {
case DataBuffer.TYPE_FLOAT:
dbClass = floatClass;
break;
case DataBuffer.TYPE_DOUBLE:
dbClass = doubleClass;
break;
default:
throw new IllegalArgumentException("dataType == "+dataType+"!");
}
DataBuffer dataBuffer = null;
try {
Constructor constructor = dbClass.getConstructor(paramTypes);
dataBuffer = (DataBuffer)constructor.newInstance(paramValues);
} catch(Exception e) {
throw new RuntimeException(JaiI18N.getString("DataBufferUtils1"));
}
return dataBuffer;
}
/**
* Invoke the <code>DataBuffer</code> method of the specified name
* using the parameters with the specified types and values.
*/
private static final Object invokeDataBufferMethod(DataBuffer dataBuffer,
String methodName,
Class[] paramTypes,
Object[] paramValues) {
if(dataBuffer == null) {
throw new IllegalArgumentException("dataBuffer == null!");
}
Class dbClass = dataBuffer.getClass();
Object returnValue = null;
try {
Method method = dbClass.getMethod(methodName, paramTypes);
returnValue = method.invoke(dataBuffer, paramValues);
} catch(Exception e) {
throw new RuntimeException(JaiI18N.getString("DataBufferUtils2")+
" \""+methodName+"\".");
}
return returnValue;
}
public static final DataBuffer createDataBufferFloat(float[][] dataArray,
int size) {
return constructDataBuffer(DataBuffer.TYPE_FLOAT,
new Class[] {float[][].class,
int.class},
new Object[] {dataArray,
new Integer(size)});
}
public static final DataBuffer createDataBufferFloat(float[][] dataArray,
int size,
int[] offsets) {
return constructDataBuffer(DataBuffer.TYPE_FLOAT,
new Class[] {float[][].class,
int.class,
int[].class},
new Object[] {dataArray,
new Integer(size),
offsets});
}
public static final DataBuffer createDataBufferFloat(float[] dataArray,
int size) {
return constructDataBuffer(DataBuffer.TYPE_FLOAT,
new Class[] {float[].class,
int.class},
new Object[] {dataArray,
new Integer(size)});
}
public static final DataBuffer createDataBufferFloat(float[] dataArray,
int size,
int offset) {
return constructDataBuffer(DataBuffer.TYPE_FLOAT,
new Class[] {float[].class,
int.class,
int.class},
new Object[] {dataArray,
new Integer(size),
new Integer(offset)});
}
public static final DataBuffer createDataBufferFloat(int size) {
return constructDataBuffer(DataBuffer.TYPE_FLOAT,
new Class[] {int.class},
new Object[] {new Integer(size)});
}
public static final DataBuffer createDataBufferFloat(int size,
int numBanks) {
return constructDataBuffer(DataBuffer.TYPE_FLOAT,
new Class[] {int.class,
int.class},
new Object[] {new Integer(size),
new Integer(numBanks)});
}
public static final float[][] getBankDataFloat(DataBuffer dataBuffer) {
return (float[][])invokeDataBufferMethod(dataBuffer,
"getBankData",
null,
null);
}
public static final float[] getDataFloat(DataBuffer dataBuffer) {
return (float[])invokeDataBufferMethod(dataBuffer,
"getData",
null,
null);
}
public static final float[] getDataFloat(DataBuffer dataBuffer,
int bank) {
return (float[])invokeDataBufferMethod(dataBuffer,
"getData",
new Class[] {int.class},
new Object[] {new Integer(bank)});
}
public static final DataBuffer createDataBufferDouble(double[][] dataArray,
int size) {
return constructDataBuffer(DataBuffer.TYPE_DOUBLE,
new Class[] {double[][].class,
int.class},
new Object[] {dataArray,
new Integer(size)});
}
public static final DataBuffer createDataBufferDouble(double[][] dataArray,
int size,
int[] offsets) {
return constructDataBuffer(DataBuffer.TYPE_DOUBLE,
new Class[] {double[][].class,
int.class,
int[].class},
new Object[] {dataArray,
new Integer(size),
offsets});
}
public static final DataBuffer createDataBufferDouble(double[] dataArray,
int size) {
return constructDataBuffer(DataBuffer.TYPE_DOUBLE,
new Class[] {double[].class,
int.class},
new Object[] {dataArray,
new Integer(size)});
}
public static final DataBuffer createDataBufferDouble(double[] dataArray,
int size,
int offset) {
return constructDataBuffer(DataBuffer.TYPE_DOUBLE,
new Class[] {double[].class,
int.class,
int.class},
new Object[] {dataArray,
new Integer(size),
new Integer(offset)});
}
public static final DataBuffer createDataBufferDouble(int size) {
return constructDataBuffer(DataBuffer.TYPE_DOUBLE,
new Class[] {int.class},
new Object[] {new Integer(size)});
}
public static final DataBuffer createDataBufferDouble(int size,
int numBanks) {
return constructDataBuffer(DataBuffer.TYPE_DOUBLE,
new Class[] {int.class,
int.class},
new Object[] {new Integer(size),
new Integer(numBanks)});
}
public static final double[][] getBankDataDouble(DataBuffer dataBuffer) {
return (double[][])invokeDataBufferMethod(dataBuffer,
"getBankData",
null,
null);
}
public static final double[] getDataDouble(DataBuffer dataBuffer) {
return (double[])invokeDataBufferMethod(dataBuffer,
"getData",
null,
null);
}
public static final double[] getDataDouble(DataBuffer dataBuffer,
int bank) {
return (double[])invokeDataBufferMethod(dataBuffer,
"getData",
new Class[] {int.class},
new Object[] {new Integer(bank)});
}
}