/*
 * Copyright 2018 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.gradle.api.internal.provider;

import org.gradle.internal.Cast;
import org.gradle.util.CollectionUtils;

import java.util.Collection;

public class ValueSanitizers {
    private static final ValueSanitizer<Object> STRING_VALUE_SANITIZER = new ValueSanitizer<Object>() {
        @Override
        public Object sanitize(Object value) {
            if (!(value instanceof String)) {
                // The string name compare is a work around for the fact that GString isn't visible in base-services
                // TODO - move this somewhere where GString is visible
                Class<?> superclass = value.getClass().getSuperclass();
                if (superclass != null && superclass.getName().equals("groovy.lang.GString")) {
                    return value.toString();
                }
            }
            return value;
        }
    };
    private static final ValueSanitizer<Object> IDENTITY_SANITIZER = new ValueSanitizer<Object>() {
        @Override
        public Object sanitize(Object value) {
            return value;
        }
    };
    private static final ValueCollector<Object> IDENTITY_VALUE_COLLECTOR = new ValueCollector<Object>() {
        @Override
        public void add(Object value, Collection<Object> dest) {
            dest.add(value);
        }

        @Override
        public void addAll(Iterable<?> values, Collection<Object> dest) {
            CollectionUtils.addAll(dest, values);
        }
    };
    private static final ValueCollector<Object> STRING_VALUE_COLLECTOR = new ValueCollector<Object>() {
        @Override
        public void add(Object value, Collection<Object> dest) {
            dest.add(STRING_VALUE_SANITIZER.sanitize(value));
        }

        @Override
        public void addAll(Iterable<?> values, Collection<Object> dest) {
            for (Object value : values) {
                add(value, dest);
            }
        }
    };

    public static <T> ValueSanitizer<T> forType(Class<? extends T> targetType) {
        if (String.class.equals(targetType)) {
            return Cast.uncheckedCast(STRING_VALUE_SANITIZER);
        } else {
            return Cast.uncheckedCast(IDENTITY_SANITIZER);
        }
    }

    public static <T> ValueCollector<T> collectorFor(Class<? extends T> elementType) {
        if (String.class.equals(elementType)) {
            return Cast.uncheckedCast(STRING_VALUE_COLLECTOR);
        } else {
            return Cast.uncheckedCast(IDENTITY_VALUE_COLLECTOR);
        }
    }
}

@@ -653,16 +653,44 @@
 vider;%0A%0A
+import groovy.lang.GString;%0A
 import o
@@ -714,16 +714,16 @@
 l.Cast;%0A
-
 import o
@@ -1004,10 +1004,8 @@
  if 
-(!
 (val
@@ -1022,16 +1022,16 @@
 eof 
+G
 String)
-)
  %7B%0A 
@@ -1049,352 +1049,54 @@
     
-// The string name compare is a work around for the fact that GString isn't visible in base-services%0A                // TODO - move this somewhere where GString is visible%0A                Class%3C?%3E superclass = value.getClass().getSuperclass();%0A                if (superclass != null && superclass.getName().equals(%22groovy.lang.GString%22)) %7B%0A    
+return value.toString();%0A            %7D else %7B%0A
     
@@ -1115,35 +1115,24 @@
 return value
-.toString()
 ;%0A          
@@ -1137,53 +1137,9 @@
     
-    %7D%0A            %7D%0A            return value;
+%7D
 %0A   

Remove work around in coercing GString instances used for the value of a String property.