/*
* Copyright 2008 Google Inc.
*
* 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 com.google.gwt.dev.jjs.impl;
import com.google.gwt.dev.jjs.ast.JCastOperation;
import com.google.gwt.dev.jjs.ast.JDeclaredType;
import com.google.gwt.dev.jjs.ast.JExpression;
import com.google.gwt.dev.jjs.ast.JMethod;
import com.google.gwt.dev.jjs.ast.JMethodCall;
import com.google.gwt.dev.jjs.ast.JPrimitiveType;
import com.google.gwt.dev.jjs.ast.JProgram;
import java.util.Collection;
import java.util.LinkedHashMap;
import java.util.Map;
/**
* Utilities for managing autoboxing of Java primitive types.
*/
public class AutoboxUtils {
private static final JPrimitiveType[] TYPES = {
JPrimitiveType.BOOLEAN, JPrimitiveType.BYTE, JPrimitiveType.CHAR, JPrimitiveType.SHORT,
JPrimitiveType.INT, JPrimitiveType.LONG, JPrimitiveType.FLOAT, JPrimitiveType.DOUBLE};
private final Map<JPrimitiveType, JMethod> boxMethods =
new LinkedHashMap<JPrimitiveType, JMethod>();
private final Map<JDeclaredType, JMethod> unboxMethods =
new LinkedHashMap<JDeclaredType, JMethod>();
public AutoboxUtils(JProgram program) {
for (JPrimitiveType primType : TYPES) {
JDeclaredType wrapperType = program.getFromTypeMap(primType.getWrapperTypeName());
String boxSig =
"valueOf(" + primType.getJsniSignatureName() + ")" + wrapperType.getJsniSignatureName();
String unboxSig = primType.getName() + "Value()" + primType.getJsniSignatureName();
for (JMethod method : wrapperType.getMethods()) {
if (method.isStatic()) {
if (method.getSignature().equals(boxSig)) {
boxMethods.put(primType, method);
}
} else {
if (method.getSignature().equals(unboxSig)) {
unboxMethods.put(wrapperType, method);
}
}
}
}
assert boxMethods.size() == TYPES.length;
assert unboxMethods.size() == TYPES.length;
}
/**
* Box the expression <code>toBox</code> into the wrapper type corresponding
* to <code>primitiveType</code>. If <code>toBox</code> is not already of type
* <code>primitiveType</code>, then a cast may be necessary.
*/
public JExpression box(JExpression toBox, JPrimitiveType primitiveType) {
// Add a cast to toBox if need be
if (toBox.getType() != primitiveType) {
toBox = new JCastOperation(toBox.getSourceInfo(), primitiveType, toBox);
}
JMethod method = boxMethods.get(primitiveType);
assert method != null;
JMethodCall call = new JMethodCall(toBox.getSourceInfo(), null, method);
call.addArg(toBox);
return call;
}
public Collection<JMethod> getBoxMethods() {
return boxMethods.values();
}
public Collection<JMethod> getUnboxMethods() {
return unboxMethods.values();
}
/**
* If <code>x</code> is an unbox expression, then return the expression that
* is being unboxed by it. Otherwise, return <code>null</code>.
*/
public JExpression undoUnbox(JExpression arg) {
if (arg instanceof JMethodCall) {
JMethodCall argMethodCall = (JMethodCall) arg;
assert unboxMethods.values().contains(argMethodCall.getTarget());
return argMethodCall.getInstance();
}
return null;
}
}