OptionalFieldDescription.java

/**
 * 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 <http://www.gnu.org/licenses/>.
 */
package ch.powerunit.extensions.matchers.provideprocessor.fields;

import static java.util.Optional.ofNullable;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;

import ch.powerunit.extensions.matchers.provideprocessor.Matchable;
import ch.powerunit.extensions.matchers.provideprocessor.ProvidesMatchersAnnotatedElementData;

public class OptionalFieldDescription extends DefaultFieldDescription {

    public OptionalFieldDescription(ProvidesMatchersAnnotatedElementData containingElementMirror,
            FieldDescriptionMirror mirror) {
        super(containingElementMirror, mirror);
    }

    @Override
    protected Collection<FieldDSLMethod> getSpecificFieldDslMethodFor() {
        Collection<FieldDSLMethod> dsl = new ArrayList<>();
        dsl.addAll(getPresentDSL());
        dsl.addAll(getAbsentDSL());
        return dsl;
    }

    private Collection<FieldDSLMethod> getPresentDSL() {
        String fieldType = getFieldType();
        return Arrays.asList(
                getDslMethodBuilder().withSuffixDeclarationJavadocAndDefault("IsPresent", "with a present optional",
                        "new org.hamcrest.CustomTypeSafeMatcher<" + fieldType
                                + ">(\"optional is present\"){ public boolean matchesSafely(" + fieldType
                                + " o) {return o.isPresent();}}"),
                getDslMethodBuilder().withDeclaration("IsPresentAndIs", generic + " value")
                        .withJavaDoc("with a present optional having a specific value",
                                "value the value the optional must have")
                        .havingDefault("new org.hamcrest.TypeSafeMatcher<" + fieldType
                                + ">(){ public boolean matchesSafely(" + fieldType
                                + " o) {return o.isPresent() && o.get().equals(value);} public void describeTo(org.hamcrest.Description description) {description.appendText(\"optional is present and is \").appendValue(value);}}"),
                getDslMethodBuilder().withDeclaration("IsPresentAndIs", "org.hamcrest.Matcher<" + generic + "> matcher")
                        .withJavaDoc("with a present optional matching a specified matcher",
                                "matcher the matcher that must accept the optional value")
                        .havingDefault("new org.hamcrest.TypeSafeMatcher<" + fieldType
                                + ">(){ public boolean matchesSafely(" + fieldType
                                + " o) {return o.isPresent() && matcher.matches(o.get());} public void describeTo(org.hamcrest.Description description) {description.appendText(\"optional is present and [\").appendDescriptionOf(matcher).appendText(\"]\");}}"));
    }

    private Collection<FieldDSLMethod> getAbsentDSL() {
        String fieldType = getFieldType();
        return Arrays.asList(
                getDslMethodBuilder().withSuffixDeclarationJavadocAndDefault("IsNotPresent",
                        "with a not present optional",
                        "new org.hamcrest.CustomTypeSafeMatcher<" + fieldType
                                + ">(\"optional is not present\"){ public boolean matchesSafely(" + fieldType
                                + " o) {return !o.isPresent();}}"),
                getDslMethodBuilder().withSuffixDeclarationJavadocAndDefault("IsAbsent", "with an absent optional",
                        "new org.hamcrest.CustomTypeSafeMatcher<" + fieldType
                                + ">(\"optional is not present\"){ public boolean matchesSafely(" + fieldType
                                + " o) {return !o.isPresent();}}"));
    }

    @Override
    public String getFieldCopy(String lhs, String rhs, String ignore) {
        if (!"".equals(generic)) {
            return getFieldCopyForOptional(lhs, rhs, ignore);
        }
        return super.getFieldCopy(lhs, rhs, ignore);
    }

    public String getFieldCopyForOptional(String lhs, String rhs, String paramForHasSameValue) {
        String fieldAccessor = getFieldAccessor();
        String fieldName = getFieldName();
        return "if(" + rhs + "." + fieldAccessor + "==null) {\n  " + lhs + "." + fieldName + "(" + MATCHERS
                + ".nullValue());\n} else if (!" + rhs + "." + fieldAccessor + ".isPresent()) {\n  " + lhs + "."
                + fieldName + "IsAbsent();\n} else {\n  " + lhs + "." + fieldName + "IsPresentAndIs("
                + generateMatcherBuilderReferenceFor(generic, rhs + "." + fieldAccessor + ".get()",
                        paramForHasSameValue)
                + ");\n}";
    }

    public String generateMatcherBuilderReferenceFor(String generic, String accessor, String paramForHasSameValue) {
        return ofNullable(getByName(generic)).filter(Matchable::hasWithSameValue).map(
                t -> t.getWithSameValue(false) + "(" + accessor + (t.supportIgnore() ? paramForHasSameValue : "") + ")")
                .orElse(MATCHERS + ".is(" + accessor + ")");
    }

}