com.predic8.membrane.core.graphql.model.Selection Maven / Gradle / Ivy
/* Copyright 2023 predic8 GmbH, www.predic8.com
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 com.predic8.membrane.core.graphql.model;
import com.predic8.membrane.core.graphql.ParsingException;
import com.predic8.membrane.core.graphql.Tokenizer;
import java.io.IOException;
import static com.predic8.membrane.core.graphql.Tokenizer.Type.NAME;
import static com.predic8.membrane.core.graphql.Tokenizer.Type.PUNCTUATOR;
public abstract class Selection {
public abstract void parse(Tokenizer tokenizer) throws IOException, ParsingException;
public static Selection parseSelection(Tokenizer tokenizer) throws IOException, ParsingException {
Selection sel = null;
if (tokenizer.type() == NAME) {
sel = new Field();
} else if (tokenizer.type() == PUNCTUATOR && tokenizer.punctuator() == '.') {
tokenizer.mustAdvance();
if (tokenizer.type() == NAME && !tokenizer.string().equals("on"))
sel = new FragmentSpread();
else
sel = new InlineFragment();
}
if (sel == null)
throw new ParsingException("Expected field (name) or fragment ('...').", tokenizer.position());
sel.parse(tokenizer);
return sel;
}
}