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/*
* Copyright (C) 2005 db4objects Inc. http://www.db4o.com
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* db4objects - Initial API and implementation
*/
package org.eclipse.core.internal.databinding.conversion;
import org.eclipse.core.databinding.BindingException;
import org.eclipse.core.databinding.conversion.IConverter;
/**
* TheIdentityConverter. Returns the source value (the identity function).
*/
public class IdentityConverter implements IConverter {
private Class fromType;
private Class toType;
/**
* @param type
*/
public IdentityConverter(Class type) {
this.fromType = type;
this.toType = type;
}
/**
* @param fromType
* @param toType
*/
public IdentityConverter(Class fromType, Class toType) {
this.fromType = fromType;
this.toType = toType;
}
private Class[][] primitiveMap = new Class[][] {
{ Integer.TYPE, Integer.class }, { Short.TYPE, Short.class },
{ Long.TYPE, Long.class }, { Double.TYPE, Double.class },
{ Byte.TYPE, Byte.class }, { Float.TYPE, Float.class },
{ Boolean.TYPE, Boolean.class }, };
/*
* (non-Javadoc)
*
* @see org.eclipse.jface.binding.converter.IConverter#convert(java.lang.Object)
*/
public Object convert(Object source) {
if (toType.isPrimitive()) {
if (source == null) {
throw new BindingException("Cannot convert null to a primitive"); //$NON-NLS-1$
}
}
if (source != null) {
Class sourceClass = source.getClass();
if (toType.isPrimitive() || sourceClass.isPrimitive()) {
if (sourceClass.equals(toType)
|| isPrimitiveTypeMatchedWithBoxed(sourceClass, toType)) {
return source;
}
throw new BindingException(
"Boxed and unboxed types do not match"); //$NON-NLS-1$
}
if (!toType.isAssignableFrom(sourceClass)) {
throw new BindingException(sourceClass.getName()
+ " is not assignable to " + toType.getName()); //$NON-NLS-1$
}
}
return source;
}
/**
* (Non-API) isPrimitiveTypeMatchedWithBoxed.
*
* @param sourceClass
* @param toClass
* @return true if sourceClass and toType are matched primitive/boxed types
*/
public boolean isPrimitiveTypeMatchedWithBoxed(Class sourceClass,
Class toClass) {
for (int i = 0; i < primitiveMap.length; i++) {
if (toClass.equals(primitiveMap[i][0])
&& sourceClass.equals(primitiveMap[i][1])) {
return true;
}
if (sourceClass.equals(primitiveMap[i][0])
&& toClass.equals(primitiveMap[i][1])) {
return true;
}
}
return false;
}
public Object getFromType() {
return fromType;
}
public Object getToType() {
return toType;
}
}
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