org.springframework.boot.test.context.assertj.AssertProviderApplicationContextInvocationHandler.java Source code

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Here is the source code for org.springframework.boot.test.context.assertj.AssertProviderApplicationContextInvocationHandler.java

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/*
 * Copyright 2012-2017 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.boot.test.context.assertj;

import java.io.Closeable;
import java.io.IOException;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Arrays;
import java.util.function.Supplier;

import org.apache.commons.lang3.builder.ToStringBuilder;

import org.springframework.context.ApplicationContext;
import org.springframework.util.Assert;
import org.springframework.util.ObjectUtils;

/**
 * {@link InvocationHandler} used by {@link ApplicationContextAssertProvider} generated
 * proxies.
 *
 * @author Phillip Webb
 */
class AssertProviderApplicationContextInvocationHandler implements InvocationHandler {

    private final Class<?> applicationContextType;

    private final ApplicationContext applicationContext;

    private final RuntimeException startupFailure;

    AssertProviderApplicationContextInvocationHandler(Class<?> applicationContextType,
            Supplier<?> contextSupplier) {
        this.applicationContextType = applicationContextType;
        Object contextOrStartupFailure = getContextOrStartupFailure(contextSupplier);
        if (contextOrStartupFailure instanceof RuntimeException) {
            this.applicationContext = null;
            this.startupFailure = (RuntimeException) contextOrStartupFailure;
        } else {
            this.applicationContext = (ApplicationContext) contextOrStartupFailure;
            this.startupFailure = null;
        }
    }

    private Object getContextOrStartupFailure(Supplier<?> contextSupplier) {
        try {
            return contextSupplier.get();
        } catch (RuntimeException ex) {
            return ex;
        }
    }

    @Override
    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
        if (isToString(method)) {
            return toString();
        }
        if (isGetSourceContext(method)) {
            return getSourceContext(args);
        }
        if (isGetStartupFailure(method)) {
            return getStartupFailure();
        }
        if (isAssertThat(method)) {
            return getAssertThat(proxy);
        }
        if (isCloseMethod(method)) {
            return invokeClose();
        }
        return invokeApplicationContextMethod(method, args);
    }

    private boolean isToString(Method method) {
        return ("toString".equals(method.getName()) && method.getParameterCount() == 0);
    }

    @Override
    public String toString() {
        if (this.startupFailure != null) {
            return "Unstarted application context " + this.applicationContextType.getName() + "[startupFailure="
                    + this.startupFailure.getClass().getName() + "]";
        }
        ToStringBuilder builder = new ToStringBuilder(this.applicationContext)
                .append("id", this.applicationContext.getId())
                .append("applicationName", this.applicationContext.getApplicationName())
                .append("beanDefinitionCount", this.applicationContext.getBeanDefinitionCount());
        return "Started application " + builder;
    }

    private boolean isGetSourceContext(Method method) {
        return "getSourceApplicationContext".equals(method.getName()) && ((method.getParameterCount() == 0)
                || Arrays.equals(new Class<?>[] { Class.class }, method.getParameterTypes()));
    }

    private Object getSourceContext(Object[] args) {
        ApplicationContext context = getStartedApplicationContext();
        if (!ObjectUtils.isEmpty(args)) {
            Assert.isInstanceOf((Class<?>) args[0], context);
        }
        return context;
    }

    private boolean isGetStartupFailure(Method method) {
        return ("getStartupFailure".equals(method.getName()) && method.getParameterCount() == 0);
    }

    private Object getStartupFailure() {
        return this.startupFailure;
    }

    private boolean isAssertThat(Method method) {
        return ("assertThat".equals(method.getName()) && method.getParameterCount() == 0);
    }

    private Object getAssertThat(Object proxy) {
        return new ApplicationContextAssert<>((ApplicationContext) proxy, this.startupFailure);
    }

    private boolean isCloseMethod(Method method) {
        return ("close".equals(method.getName()) && method.getParameterCount() == 0);
    }

    private Object invokeClose() throws IOException {
        if (this.applicationContext instanceof Closeable) {
            ((Closeable) this.applicationContext).close();
        }
        return null;
    }

    private Object invokeApplicationContextMethod(Method method, Object[] args) throws Throwable {
        try {
            return method.invoke(getStartedApplicationContext(), args);
        } catch (InvocationTargetException ex) {
            throw ex.getTargetException();
        }
    }

    private ApplicationContext getStartedApplicationContext() {
        if (this.startupFailure != null) {
            throw new IllegalStateException(toString() + " failed to start", this.startupFailure);
        }
        return this.applicationContext;
    }

}