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Providence Core extension for GraphQL.
package net.morimekta.providence.graphql.gql;
import net.morimekta.providence.PMessage;
import net.morimekta.providence.descriptor.PField;
import net.morimekta.providence.descriptor.PServiceMethod;
import net.morimekta.util.collect.UnmodifiableList;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import javax.annotation.concurrent.Immutable;
import java.util.List;
import java.util.Objects;
import static net.morimekta.providence.graphql.gql.GQLUtil.toArgumentString;
/**
* Representation of a method call in an operation. This is distinct
* from a field request, as this level the call and response is ultimately
* required, where as the fields are added per availability. It also
* represents the call to an actual service which will provide the
* response to be returned for the named JSON field.
*
* {@inheritDoc}
*/
@Immutable
public class GQLMethodCall implements GQLSelection {
private final String alias;
private final PServiceMethod method;
private final PMessage> arguments;
private final List selectionSet;
/**
* Make a full field selection definition.
*
* @param method The method call to be represented.
* @param alias The alias to be used in the JSON output.
* @param arguments Arguments used for the method call.
* @param selectionSet SelectionSet for sub-field selection.
*/
public GQLMethodCall(@Nonnull PServiceMethod method,
@Nullable String alias,
@Nullable PMessage> arguments,
@Nullable List selectionSet) {
this.alias = alias;
this.method = method;
this.arguments = arguments;
if (selectionSet != null && selectionSet.size() > 0) {
this.selectionSet = UnmodifiableList.copyOf(selectionSet);
} else {
this.selectionSet = null;
}
}
/**
* @return The output field alias.
*/
@Nullable
public String getAlias() {
return alias;
}
/**
* @return The method to be called to get field value. If message field null.
*/
@Nonnull
public PServiceMethod getMethod() {
return method;
}
/**
* @param The argument message type.
* @return The argument struct. If no arguments or params then null.
*/
@Nullable
@SuppressWarnings("unchecked")
public >
M getArguments() {
return (M) arguments;
}
/**
* @return The field's selection set, or null if none.
*/
@Nullable
public List getSelectionSet() {
return selectionSet;
}
@Override
public String toString() {
StringBuilder builder = new StringBuilder();
if (alias != null) {
builder.append(alias).append(": ");
}
builder.append(method.getName());
if (arguments != null) {
builder.append("(");
boolean first = true;
for (PField pf : arguments.descriptor().getFields()) {
if (arguments.has(pf.getId())) {
if (!first) {
builder.append(", ");
} else {
first = false;
}
builder.append(pf.getName())
.append(": ")
.append(toArgumentString(arguments.get(pf.getId())));
}
}
builder.append(")");
}
if (selectionSet != null && selectionSet.size() > 0) {
if (arguments != null) {
builder.append(" ");
}
builder.append("{");
boolean first = true;
for (GQLSelection field : selectionSet) {
if (!first) {
builder.append(", ");
} else {
first = false;
}
builder.append(field.toString());
}
builder.append("}");
}
return builder.toString();
}
@Override
public int hashCode() {
return Objects.hash(GQLMethodCall.class,
alias, method, arguments, selectionSet);
}
@Override
public boolean equals(Object o) {
if (o == this) return true;
if (!(o instanceof GQLMethodCall)) return false;
GQLMethodCall other = (GQLMethodCall) o;
return Objects.equals(alias, other.alias) &&
Objects.equals(method, other.method) &&
Objects.equals(arguments, other.arguments) &&
Objects.equals(selectionSet, other.selectionSet);
}
}