org.wildfly.common.expression.Node Maven / Gradle / Ivy
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* Copyright 2017 Red Hat, Inc., and individual contributors
* as indicated by the @author tags.
*
* 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.wildfly.common.expression;
import java.util.HashSet;
import java.util.List;
import org.wildfly.common.function.ExceptionBiConsumer;
/**
* @author David M. Lloyd
*/
abstract class Node {
static final Node[] NO_NODES = new Node[0];
Node() {
}
static Node fromList(List list) {
if (list == null || list.isEmpty()) {
return NULL;
} else if (list.size() == 1) {
return list.get(0);
} else {
return new CompositeNode(list);
}
}
static final Node NULL = new Node() {
void emit(final ResolveContext context, final ExceptionBiConsumer, StringBuilder, E> resolveFunction) throws E {
}
void catalog(final HashSet strings) {
}
public String toString() {
return "<>";
}
};
abstract void emit(final ResolveContext context, final ExceptionBiConsumer, StringBuilder, E> resolveFunction) throws E;
abstract void catalog(final HashSet strings);
}