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Groovy example source code file (CachedConstructor.java)

This example Groovy source code file (CachedConstructor.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Groovy tags/keywords

cachedclass, cachedconstructor, cachedconstructor, constructor, constructor, couldn't, groovyruntimeexception, illegalaccessexception, illegalargumentexception, invokerinvocationexception, object, object, reflection, runtimeexception, runtimeexception, security

The Groovy CachedConstructor.java source code

/*
 * Copyright 2003-2007 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.codehaus.groovy.reflection;

import groovy.lang.GroovyRuntimeException;
import org.codehaus.groovy.runtime.InvokerHelper;
import org.codehaus.groovy.runtime.InvokerInvocationException;

import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.security.AccessController;
import java.security.PrivilegedAction;

/**
 * @author Alex.Tkachman
 */
public class CachedConstructor extends ParameterTypes {
    CachedClass clazz;

    public final Constructor cachedConstructor;

    public CachedConstructor(CachedClass clazz, final Constructor c) {
        this.cachedConstructor = c;
        this.clazz = clazz;
        try {
            AccessController.doPrivileged(new PrivilegedAction() {
                public Object run() {
                    c.setAccessible(true);
                    return null;
                }
            });
        }
        catch (SecurityException e) {
            // IGNORE
        }
    }

    public CachedConstructor(Constructor c) {
        this(ReflectionCache.getCachedClass(c.getDeclaringClass()), c);
    }

    protected Class[] getPT() {
        return cachedConstructor.getParameterTypes();
    }

    public static CachedConstructor find(Constructor constructor) {
        CachedConstructor[] constructors = ReflectionCache.getCachedClass(constructor.getDeclaringClass()).getConstructors();
        for (int i = 0; i < constructors.length; i++) {
            CachedConstructor cachedConstructor = constructors[i];
            if (cachedConstructor.cachedConstructor.equals(constructor))
                return cachedConstructor;
        }
        throw new RuntimeException("Couldn't find method: " + constructor);
    }

    public Object doConstructorInvoke(Object[] argumentArray) {
        argumentArray = coerceArgumentsToClasses(argumentArray);
        return invoke(argumentArray);
    }

    public Object invoke(Object[] argumentArray) {
        Constructor constr = cachedConstructor;
        try {
            return constr.newInstance(argumentArray);
        } catch (InvocationTargetException e) {
            throw e.getCause() instanceof RuntimeException ? (RuntimeException)e.getCause() : new InvokerInvocationException(e);
        } catch (IllegalArgumentException e) {
            throw createExceptionText("failed to invoke constructor: ", constr, argumentArray, e, false);
        } catch (IllegalAccessException e) {
            throw createExceptionText("could not access constructor: ", constr, argumentArray, e, false);
        } catch (Exception e) {
            if (e instanceof RuntimeException)
                throw (RuntimeException)e;
            else
                throw createExceptionText("failed to invoke constructor: ", constr, argumentArray, e, true);
        }
    }

    private static GroovyRuntimeException createExceptionText(String init, Constructor constructor, Object[] argumentArray, Throwable e, boolean setReason) {
        throw new GroovyRuntimeException(
                init
                        + constructor
                        + " with arguments: "
                        + InvokerHelper.toString(argumentArray)
                        + " reason: "
                        + e,
                setReason ? e : null);
    }

    public int getModifiers () {
        return cachedConstructor.getModifiers();
    }
}

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