| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 |
| * <p/> |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * <p/> |
| * 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.apache.atlas.catalog.query; |
| |
| import com.tinkerpop.blueprints.Vertex; |
| import com.tinkerpop.pipes.Pipe; |
| import com.tinkerpop.pipes.PipeFunction; |
| import com.tinkerpop.pipes.filter.FilterFunctionPipe; |
| import org.apache.atlas.catalog.VertexWrapper; |
| import org.apache.atlas.catalog.definition.ResourceDefinition; |
| |
| import java.util.Collection; |
| import java.util.HashSet; |
| |
| /** |
| * Base query expression class. |
| */ |
| public abstract class BaseQueryExpression implements QueryExpression { |
| protected String m_field; |
| protected final String m_expectedValue; |
| protected final ResourceDefinition resourceDefinition; |
| protected boolean negate = false; |
| protected Collection<String> properties = new HashSet<>(); |
| |
| protected BaseQueryExpression(String field, String expectedValue, ResourceDefinition resourceDefinition) { |
| m_field = field; |
| if (field != null) { |
| properties.add(field); |
| } |
| m_expectedValue = expectedValue; |
| this.resourceDefinition = resourceDefinition; |
| } |
| |
| @Override |
| public boolean evaluate(VertexWrapper vWrapper) { |
| return negate ^ evaluate(vWrapper.getProperty(m_field)); |
| } |
| |
| @Override |
| public Collection<String> getProperties() { |
| return properties; |
| } |
| |
| @Override |
| public boolean evaluate(Object value) { |
| // subclasses which don't override evaluate(VertexWrapper) should implement this |
| return false; |
| } |
| |
| //todo: use 'has' instead of closure where possible for performance |
| public Pipe asPipe() { |
| return new FilterFunctionPipe(new PipeFunction<Vertex, Boolean>() { |
| @Override |
| public Boolean compute(Vertex vertex) { |
| return evaluate(new VertexWrapper(vertex, resourceDefinition)); |
| } |
| }); |
| } |
| |
| @Override |
| public String getField() { |
| return m_field; |
| } |
| |
| @Override |
| public String getExpectedValue() { |
| return m_expectedValue; |
| } |
| |
| @Override |
| public void setField(String field) { |
| m_field = field; |
| } |
| |
| @Override |
| public void setNegate() { |
| this.negate = true; |
| } |
| |
| @Override |
| public boolean isNegate() { |
| return negate; |
| } |
| |
| @Override |
| public boolean isProjectionExpression() { |
| return getField() != null && getField().contains(QueryFactory.PATH_SEP_TOKEN); |
| } |
| } |