/*
 * Copyright 2020, TeamDev. All rights reserved.
 *
 * Redistribution and use in source and/or binary forms, with or without
 * modification, must retain the above copyright notice and the following
 * disclaimer.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package io.spine.code.gen.java;

import com.squareup.javapoet.CodeBlock;
import com.squareup.javapoet.MethodSpec;
import io.spine.code.javadoc.JavadocText;

import javax.lang.model.element.Modifier;

import static javax.lang.model.element.Modifier.PRIVATE;

public final class EmptyCtorSpec implements GeneratedMethodSpec {

    private static final EmptyCtorSpec INSTANCE = new EmptyCtorSpec();

    private EmptyCtorSpec() {
    }

    public static MethodSpec privateEmptyCtor() {
        return INSTANCE.methodSpec(PRIVATE);
    }

    @Override
    public MethodSpec methodSpec(Modifier... modifiers) {
        MethodSpec result = MethodSpec
                .constructorBuilder()
                .addModifiers(modifiers)
                .addJavadoc(javadoc())
                .build();
        return result; }

    /**
     * Obtains a class-level Javadoc.
     */
    private static CodeBlock javadoc() {
        JavadocText javadoc = JavadocText.fromEscaped("Prevents instantiation of this class.")
                                         .withNewLine();
        CodeBlock value = CodeBlock
                .builder()
                .add(javadoc.value())
                .build();
        return value;
    }
}

@@ -1264,16 +1264,74 @@
 IVATE;%0A%0A
+/**%0A * A spec of an empty parameter-less constructor.%0A */%0A
 public f
@@ -1469,40 +1469,238 @@
     
-private EmptyCtorSpec() %7B%0A    %7D%0A
+/**%0A     * Prevents instantiation of this class in favor of using a single created %7B@link #INSTANCE%7D.%0A     */%0A    private EmptyCtorSpec() %7B%0A    %7D%0A%0A    /**%0A     * Returns a spec for private empty parameter-less constructor.%0A     */
 %0A   
@@ -1754,22 +1754,33 @@
         
-return
+MethodSpec spec =
  INSTANC
@@ -1800,16 +1800,195 @@
 PRIVATE)
+%0A                                  .toBuilder()%0A                                  .addJavadoc(privateCtorJavadoc())%0A                                  .build();%0A        return spec
 ;%0A    %7D%0A
@@ -2182,47 +2182,8 @@
 rs)%0A
-                .addJavadoc(javadoc())%0A
     
@@ -2226,16 +2226,20 @@
  result;
+%0A   
  %7D%0A%0A    
@@ -2317,17 +2317,28 @@
 deBlock 
-j
+privateCtorJ
 avadoc()

Fix usage of `Prevents instantiation...` doc in `EmptyCtorSpec`