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This is a test framework for the JDK 1.8 - Extension to provide matchers based on annotation. - Factory Support

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/**
 * Powerunit - A JDK1.8 test framework
 * Copyright (C) 2014 Mathieu Boretti.
 *
 * This file is part of Powerunit
 *
 * Powerunit is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Powerunit is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Powerunit. If not, see .
 */
package ch.powerunit.extensions.matchers.provideprocessor.extension;

import java.util.Arrays;
import java.util.Collection;
import java.util.function.Supplier;

import ch.powerunit.extensions.matchers.ComplementaryExpositionMethod;
import ch.powerunit.extensions.matchers.provideprocessor.DSLMethod;
import ch.powerunit.extensions.matchers.provideprocessor.ProvidesMatchersAnnotatedElementData;

public class HasItemsExtension implements DSLExtension {

	public static final String CONTAINS_MATCHER = "org.hamcrest.Matchers.hasItems";

	private static final String JAVADOC_DESCRIPTION = "Generate a hasItems matcher for this Object.";

	@Override
	public ComplementaryExpositionMethod supportedEnum() {
		return ComplementaryExpositionMethod.HAS_ITEMS;
	}

	@Override
	public Collection> getDSLMethodFor(ProvidesMatchersAnnotatedElementData element) {
		String targetName = element.getFullyQualifiedNameOfClassAnnotatedWithProvideMatcherWithGeneric();
		String returnType = element.getFullGeneric() + " org.hamcrest.Matcher>";
		String methodName = element.generateDSLMethodName("hasItems");
		String targetMethodName = element.generateDSLWithSameValueMethodName();
		return new HasItemSupplier(targetName, returnType, methodName, targetMethodName).asSuppliers();
	}

	public class HasItemSupplier extends AbstractDSLExtensionSupplier {

		public HasItemSupplier(String targetName, String returnType, String methodName, String targetMethodName) {
			super(targetName, returnType, methodName, targetMethodName);
		}

		@Override
		public Collection> asSuppliers() {
			return Arrays.asList(this::generateContainsN);
		}

		public DSLMethod generateContainsN() {
			return new DSLMethod(
					new String[] { JAVADOC_DESCRIPTION, "@param item the item to be matched", "@return the Matcher." },
					returnType + " " + methodName, getSeveralParameter(true, "item"),
					"return " + CONTAINS_MATCHER + "(java.util.Arrays.stream(item).map(v->" + targetMethodName
							+ "(v)).collect(java.util.stream.Collectors.toList()).toArray(new org.hamcrest.Matcher[0]));");
		}
	}

}