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Diffstat (limited to 'src/main/java/org/onap/aai/rest/dsl/DslQueryProcessor.java')
-rw-r--r-- | src/main/java/org/onap/aai/rest/dsl/DslQueryProcessor.java | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/src/main/java/org/onap/aai/rest/dsl/DslQueryProcessor.java b/src/main/java/org/onap/aai/rest/dsl/DslQueryProcessor.java new file mode 100644 index 0000000..582f0ea --- /dev/null +++ b/src/main/java/org/onap/aai/rest/dsl/DslQueryProcessor.java @@ -0,0 +1,85 @@ +/** + * ============LICENSE_START======================================================= + * org.onap.aai + * ================================================================================ + * Copyright © 2017-2018 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.aai.rest.dsl; + +import com.att.eelf.configuration.EELFLogger; +import com.att.eelf.configuration.EELFManager; +import org.antlr.v4.runtime.CharStreams; +import org.antlr.v4.runtime.CommonTokenStream; +import org.antlr.v4.runtime.tree.ParseTree; +import org.antlr.v4.runtime.tree.ParseTreeWalker; +import org.onap.aai.AAIDslLexer; +import org.onap.aai.AAIDslParser; +import org.springframework.beans.factory.annotation.Autowired; + +import java.io.ByteArrayInputStream; +import java.io.InputStream; +import java.nio.charset.StandardCharsets; + +/** + * The Class DslQueryProcessor. + */ +public class DslQueryProcessor { + + private static final EELFLogger LOGGER = EELFManager.getInstance().getLogger(DslQueryProcessor.class); + + private DslListener dslListener; + + @Autowired + public DslQueryProcessor(DslListener dslListener){ + this.dslListener = dslListener; + } + + public String parseAaiQuery(String aaiQuery) { + try { + // Create a input stream that reads our string + InputStream stream = new ByteArrayInputStream(aaiQuery.getBytes(StandardCharsets.UTF_8)); + + // Create a lexer from the input CharStream + AAIDslLexer lexer = new AAIDslLexer(CharStreams.fromStream(stream, StandardCharsets.UTF_8)); + + // Get a list of tokens pulled from the lexer + CommonTokenStream tokens = new CommonTokenStream(lexer); + + + // Parser that feeds off of the tokens buffer + AAIDslParser parser = new AAIDslParser(tokens); + + // Specify our entry point + ParseTree ptree = parser.aaiquery(); + LOGGER.info("QUERY-interim" + ptree.toStringTree(parser)); + + // Walk it and attach our listener + ParseTreeWalker walker = new ParseTreeWalker(); + walker.walk(dslListener, ptree); + LOGGER.info("Final QUERY" + dslListener.query); + + /* + * TODO - Visitor patternQueryDslVisitor visitor = new + * QueryDslVisitor(); String query = visitor.visit(ptree); + * + */ + return dslListener.query; + } catch (Exception e) { + LOGGER.error("Error while processing the query"+e.getMessage()); + } + return ""; + } +} |