/**
 * 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
 *
 * 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.apache.cxf.tools.corba.processors.idl;

import javax.wsdl.Definition;
import javax.xml.namespace.QName;

import antlr.collections.AST;

import org.apache.cxf.binding.corba.wsdl.Const;
import org.apache.cxf.binding.corba.wsdl.CorbaTypeImpl;
import org.apache.ws.commons.schema.XmlSchema;
import org.apache.ws.commons.schema.XmlSchemaType;

public class ConstVisitor extends VisitorBase {

    public ConstVisitor(Scope scope,
                        Definition defn,
                        XmlSchema schemaRef,
                        WSDLASTVisitor wsdlVisitor) {
        super(scope, defn, schemaRef, wsdlVisitor);
    }
    
    public static boolean accept(AST node) {
        return node.getType() == IDLTokenTypes.LITERAL_const;
    }
    
    public void visit(AST constNode) {
        // <const_dcl> ::= "const" <const_type> <identifier> "=" <const_exp>
        // <const_type> ::= <integer_type>
        //                | <char_type>
        //                | <wide_char_type>
        //                | <boolean_type>
        //                | <floating_pt_type>
        //                | <string_type>
        //                | <wide_string_type>
        //                | <fixed_pt_const_type>
        //                | <scoped_name>
        //                | <octet_type>
        
        
        AST constTypeNode = constNode.getFirstChild();
        AST constNameNode = TypesUtils.getCorbaTypeNameNode(constTypeNode);
        AST constValueNode = constNameNode.getNextSibling();
        // build value string
        StringBuilder constValue = new StringBuilder();
        if (constValueNode.toString() != null) {
            constValue.append(constValueNode.toString());
        }
        constValueNode = constValueNode.getFirstChild();
        if (constValue.length() == 1) {
            // might be a control char
            byte ch = (byte)constValue.charAt(0);
            if (ch >= 0 && ch <= 31) {
                // ascii code between 0 and 31 is invisible control code
                constValue.deleteCharAt(0);
                constValue.append("\\" + Integer.toOctalString(ch));
            }
        }
        while (constValueNode != null) {
            constValue.append(constValueNode.toString());
            constValueNode = constValueNode.getFirstChild();
        }
        
        QName constQName = new QName(typeMap.getTargetNamespace(),
                                     new Scope(getScope(), constNameNode).toString());

        Visitor visitor = null;
        if (PrimitiveTypesVisitor.accept(constTypeNode)) {           
            visitor = new PrimitiveTypesVisitor(getScope(), definition, schema, schemas);           
        } else if (StringVisitor.accept(constTypeNode)) {
            // string_type_spec
            // wstring_type_spec
            visitor = new StringVisitor(getScope(), definition, schema, wsdlVisitor, constTypeNode); 
        } else if (FixedPtConstVisitor.accept(constTypeNode)) {           
            visitor = new FixedPtConstVisitor(getScope(), definition, schema, schemas); 
        } else if (ScopedNameVisitor.accept(getScope(), definition, schema, constTypeNode, wsdlVisitor)) {
            visitor = new ScopedNameVisitor(getScope(), definition, schema, wsdlVisitor);            
        }
        if (visitor == null) {
            throw new RuntimeException("can't resolve type for const " + constNameNode.getText());
        }
        visitor.visit(constTypeNode);                
        XmlSchemaType constSchemaType = visitor.getSchemaType();
        CorbaTypeImpl constCorbaType = visitor.getCorbaType();        
        
        // corba:const        
        Const corbaConst = new Const();
        corbaConst.setQName(constQName);
        corbaConst.setValue(constValue.toString());        
        corbaConst.setType(constSchemaType.getQName());
        corbaConst.setIdltype(constCorbaType.getQName());        
        
        typeMap.getStructOrExceptionOrUnion().add(corbaConst);
    }

}
