/* * Copyright 2002-2014 the original author or authors. * * 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.springframework.expression.spel.support; import java.lang.reflect.Constructor; import org.springframework.expression.AccessException; import org.springframework.expression.ConstructorExecutor; import org.springframework.expression.EvaluationContext; import org.springframework.expression.TypedValue; import org.springframework.util.ReflectionUtils; /** * A simple ConstructorExecutor implementation that runs a constructor using reflective * invocation. * * @author Andy Clement * @author Juergen Hoeller * @since 3.0 */ public class ReflectiveConstructorExecutor implements ConstructorExecutor { private final Constructor<?> ctor; private final Integer varargsPosition; public ReflectiveConstructorExecutor(Constructor<?> ctor) { this.ctor = ctor; if (ctor.isVarArgs()) { Class<?>[] paramTypes = ctor.getParameterTypes(); this.varargsPosition = paramTypes.length - 1; } else { this.varargsPosition = null; } } @Override public TypedValue execute(EvaluationContext context, Object... arguments) throws AccessException { try { if (arguments != null) { ReflectionHelper.convertArguments(context.getTypeConverter(), arguments, this.ctor, this.varargsPosition); } if (this.ctor.isVarArgs()) { arguments = ReflectionHelper.setupArgumentsForVarargsInvocation(this.ctor.getParameterTypes(), arguments); } ReflectionUtils.makeAccessible(this.ctor); return new TypedValue(this.ctor.newInstance(arguments)); } catch (Exception ex) { throw new AccessException("Problem invoking constructor: " + this.ctor, ex); } } public Constructor<?> getConstructor() { return this.ctor; } }