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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.lang.reflect.Field;
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 org.onap.so.client.graphinventory.GraphInventoryObjectName;
import com.google.common.base.Joiner;
public class DSLQueryBuilder<S, E> implements QueryStep {
private List<QueryStep> steps = new ArrayList<>();
private String suffix = "";
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() {
Object obj = steps.get(steps.size() - 1);
if (obj instanceof DSLNode) {
((DSLNode) steps.get(steps.size() - 1)).output();
} else if (obj.getClass().getName().contains("$$Lambda$")) {
// process lambda expressions
for (Field f : obj.getClass().getDeclaredFields()) {
f.setAccessible(true);
Object o;
try {
o = f.get(obj);
if (o instanceof DSLQueryBuilder && ((DSLQueryBuilder) o).steps.get(0) instanceof DSLNode) {
((DSLNode) ((DSLQueryBuilder) o).steps.get(0)).output();
}
} catch (IllegalArgumentException | IllegalAccessException e) {
}
f.setAccessible(false);
break;
}
}
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 DSLQueryBuilder<S, E> to(GraphInventoryObjectName name) {
return to(__.node(name));
}
public DSLQueryBuilder<S, E> to(GraphInventoryObjectName name, DSLNodeKey... key) {
return to(__.node(name, key));
}
public DSLQueryBuilder<S, E> limit(int limit) {
suffix = " LIMIT " + limit;
return this;
}
@Override
public String build() {
return compile();
}
@Override
public String toString() {
return build();
}
@Override
public boolean equals(Object o) {
if (o != null) {
if (o instanceof QueryStep) {
return ((QueryStep) o).build().equals(this.build());
} else if (o instanceof String) {
return o.equals(this.build());
}
}
return false;
}
@Override
public int hashCode() {
return build().hashCode();
}
private String compile() {
return Joiner.on(" ").join(steps.stream().map(item -> item.build()).collect(Collectors.toList())) + suffix;
}
protected QueryStep getFirst() {
return steps.get(0);
}
}
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