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/*-
* ============LICENSE_START=======================================================
* ONAP - SO
* ================================================================================
* Copyright (C) 2017 - 2019 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* 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.
* ============LICENSE_END=========================================================
*/
package org.onap.so.client.graphinventory.entities;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;
import org.onap.so.client.aai.entities.QueryStep;
import com.google.common.base.Joiner;
public class DSLQueryBuilder<S, E> implements QueryStep {
private List<QueryStep> steps = new ArrayList<>();
public DSLQueryBuilder() {
}
public DSLQueryBuilder(DSLNode node) {
steps.add(node);
}
public DSLQueryBuilder<S, DSLNode> node(DSLNode node) {
steps.add(node);
return (DSLQueryBuilder<S, DSLNode>) this;
}
public DSLQueryBuilder<S, E> output() {
if (steps.get(steps.size() -1) instanceof DSLNode) {
((DSLNode)steps.get(steps.size() -1)).output();
}
return this;
}
public <E2> DSLQueryBuilder<S, E2> union(final DSLQueryBuilder<?, E2>... union) {
List<DSLQueryBuilder<?, ?>> unions = Arrays.asList(union);
steps.add(() -> {
StringBuilder query = new StringBuilder();
query.append("> [ ").append(
Joiner.on(", ").join(
unions.stream().map(item -> item.build()).collect(Collectors.toList())))
.append(" ]");
return query.toString();
});
return (DSLQueryBuilder<S, E2>) this;
}
public DSLQueryBuilder<S, E> where(DSLQueryBuilder<?, ?> where) {
steps.add(() -> {
StringBuilder query = new StringBuilder();
query.append(where.build()).append(")");
String result = query.toString();
if (!result.startsWith(">")) {
result = "> " + result;
}
return "(" + result;
});
return this;
}
public DSLQueryBuilder<S, E> to(DSLQueryBuilder<?, ?> to) {
steps.add(() -> {
StringBuilder query = new StringBuilder();
query.append("> ").append(to.build());
return query.toString();
});
return this;
}
public String limit(int limit) {
return compile() + " LIMIT " + limit;
}
@Override
public String build() {
return compile();
}
private String compile() {
return Joiner.on(" ").join(steps.stream().map(item -> item.build()).collect(Collectors.toList()));
}
protected QueryStep getFirst() {
return steps.get(0);
}
}
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