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package graphql.language;


import com.google.common.collect.ImmutableList;
import graphql.Internal;
import graphql.PublicApi;
import graphql.collect.ImmutableKit;
import graphql.util.TraversalControl;
import graphql.util.TraverserContext;

import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.function.Consumer;

import static graphql.Assert.assertNotNull;
import static graphql.collect.ImmutableKit.emptyList;
import static graphql.collect.ImmutableKit.emptyMap;
import static graphql.language.NodeChildrenContainer.newNodeChildrenContainer;

@PublicApi
public class ScalarTypeDefinition extends AbstractDescribedNode implements TypeDefinition, DirectivesContainer, NamedNode {

    private final String name;
    private final ImmutableList directives;

    public static final String CHILD_DIRECTIVES = "directives";

    @Internal
    protected ScalarTypeDefinition(String name,
                                   List directives,
                                   Description description,
                                   SourceLocation sourceLocation,
                                   List comments,
                                   IgnoredChars ignoredChars,
                                   Map additionalData) {
        super(sourceLocation, comments, ignoredChars, additionalData, description);
        this.name = name;
        this.directives = ImmutableList.copyOf(directives);
    }

    /**
     * alternative to using a Builder for convenience
     *
     * @param name of the scalar
     */
    public ScalarTypeDefinition(String name) {
        this(name, emptyList(), null, null, emptyList(), IgnoredChars.EMPTY, emptyMap());
    }

    @Override
    public List getDirectives() {
        return directives;
    }

    @Override
    public String getName() {
        return name;
    }

    @Override
    public List getChildren() {
        return ImmutableList.copyOf(directives);
    }

    @Override
    public NodeChildrenContainer getNamedChildren() {
        return newNodeChildrenContainer()
                .children(CHILD_DIRECTIVES, directives)
                .build();
    }

    @Override
    public ScalarTypeDefinition withNewChildren(NodeChildrenContainer newChildren) {
        return transform(builder -> builder
                .directives(newChildren.getChildren(CHILD_DIRECTIVES))
        );
    }

    @Override
    public boolean isEqualTo(Node o) {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }

        ScalarTypeDefinition that = (ScalarTypeDefinition) o;

        return Objects.equals(this.name, that.name);
    }

    @Override
    public ScalarTypeDefinition deepCopy() {
        return new ScalarTypeDefinition(name, deepCopy(directives), description, getSourceLocation(), getComments(), getIgnoredChars(), getAdditionalData());
    }

    @Override
    public String toString() {
        return "ScalarTypeDefinition{" +
                "name='" + name + '\'' +
                ", directives=" + directives +
                '}';
    }

    @Override
    public TraversalControl accept(TraverserContext context, NodeVisitor visitor) {
        return visitor.visitScalarTypeDefinition(this, context);
    }

    public static Builder newScalarTypeDefinition() {
        return new Builder();
    }

    public ScalarTypeDefinition transform(Consumer builderConsumer) {
        Builder builder = new Builder(this);
        builderConsumer.accept(builder);
        return builder.build();
    }

    public static final class Builder implements NodeDirectivesBuilder {
        private SourceLocation sourceLocation;
        private ImmutableList comments = emptyList();
        private String name;
        private Description description;
        private ImmutableList directives = emptyList();
        private IgnoredChars ignoredChars = IgnoredChars.EMPTY;
        private Map additionalData = new LinkedHashMap<>();

        private Builder() {
        }

        private Builder(ScalarTypeDefinition existing) {
            this.sourceLocation = existing.getSourceLocation();
            this.comments = ImmutableList.copyOf(existing.getComments());
            this.name = existing.getName();
            this.description = existing.getDescription();
            this.directives = ImmutableList.copyOf(existing.getDirectives());
            this.ignoredChars = existing.getIgnoredChars();
            this.additionalData = new LinkedHashMap<>(existing.getAdditionalData());
        }


        public Builder sourceLocation(SourceLocation sourceLocation) {
            this.sourceLocation = sourceLocation;
            return this;
        }

        public Builder comments(List comments) {
            this.comments = ImmutableList.copyOf(comments);
            return this;
        }

        public Builder name(String name) {
            this.name = name;
            return this;
        }

        public Builder description(Description description) {
            this.description = description;
            return this;
        }

        @Override
        public Builder directives(List directives) {
            this.directives = ImmutableList.copyOf(directives);
            return this;
        }

        public Builder directive(Directive directive) {
            this.directives = ImmutableKit.addToList(directives, directive);
            return this;
        }

        public Builder ignoredChars(IgnoredChars ignoredChars) {
            this.ignoredChars = ignoredChars;
            return this;
        }

        public Builder additionalData(Map additionalData) {
            this.additionalData = assertNotNull(additionalData);
            return this;
        }

        public Builder additionalData(String key, String value) {
            this.additionalData.put(key, value);
            return this;
        }

        public ScalarTypeDefinition build() {
            return new ScalarTypeDefinition(name,
                    directives,
                    description,
                    sourceLocation,
                    comments,
                    ignoredChars, additionalData);
        }
    }
}