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With inspiration from other libraries
/**
* MVEL (The MVFLEX Expression Language)
*
* Copyright (C) 2007 Christopher Brock, MVFLEX/Valhalla Project and the Codehaus
*
* 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 org.mvel2.optimizers.impl.refl.nodes;
import org.mvel2.compiler.ExecutableStatement;
import org.mvel2.integration.VariableResolverFactory;
import java.lang.reflect.Constructor;
public class ConstructorAccessor extends InvokableAccessor {
private Constructor constructor;
public Object getValue(Object ctx, Object elCtx, VariableResolverFactory variableFactory) {
try {
if (!coercionNeeded) {
try {
if (nextNode != null) {
return nextNode.getValue(constructor.newInstance(executeAll(elCtx, variableFactory)), elCtx, variableFactory);
}
else {
return constructor.newInstance(executeAll(elCtx, variableFactory));
}
}
catch (IllegalArgumentException e) {
coercionNeeded = true;
return getValue(ctx, elCtx, variableFactory);
}
}
else {
if (nextNode != null) {
return nextNode.getValue(constructor.newInstance(executeAndCoerce(parameterTypes, elCtx, variableFactory, constructor.isVarArgs())),
elCtx, variableFactory);
}
else {
return constructor.newInstance(executeAndCoerce(parameterTypes, elCtx, variableFactory, constructor.isVarArgs()));
}
}
}
catch (Exception e) {
throw new RuntimeException("cannot construct object", e);
}
}
public Object setValue(Object ctx, Object elCtx, VariableResolverFactory variableFactory, Object value) {
return null;
}
private Object[] executeAll(Object ctx, VariableResolverFactory vars) {
if (length == 0) return GetterAccessor.EMPTY;
Object[] vals = new Object[length];
for (int i = 0; i < length; i++) {
vals[i] = parms[i].getValue( ctx, vars);
}
return vals;
}
public ConstructorAccessor(Constructor constructor, ExecutableStatement[] parms) {
this.constructor = constructor;
this.length = (this.parameterTypes = constructor.getParameterTypes()).length;
this.parms = parms;
}
public Class getKnownEgressType() {
return constructor.getClass();
}
public Constructor getConstructor() {
return constructor;
}
public ExecutableStatement[] getParameters() {
return parms;
}
}