/*

 */

/*

 * 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 com.sun.org.apache.xalan.internal.xsltc.compiler;

import com.sun.org.apache.bcel.internal.generic.ConstantPoolGen;

import com.sun.org.apache.bcel.internal.generic.ILOAD;

import com.sun.org.apache.bcel.internal.generic.INVOKESTATIC;

import com.sun.org.apache.bcel.internal.generic.InstructionList;

import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ClassGenerator;

import com.sun.org.apache.xalan.internal.xsltc.compiler.util.FilterGenerator;

import com.sun.org.apache.xalan.internal.xsltc.compiler.util.MethodGenerator;

import com.sun.org.apache.xalan.internal.xsltc.compiler.util.StringType;

import com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type;

import com.sun.org.apache.xalan.internal.xsltc.compiler.util.TypeCheckError;

/**

 * @author Morten Jorgensen

 */

final class LangCall extends FunctionCall {

    private Expression _lang;

    private Type _langType;

    /**

     * Get the parameters passed to function:

     *   lang(string)

     */

        super(fname, arguments);

        _lang = argument(0);

    }

    /**

     *

     */

    public Type typeCheck(SymbolTable stable) throws TypeCheckError {

        _langType = _lang.typeCheck(stable);

        if (!(_langType instanceof StringType)) {

            _lang = new CastExpr(_lang, Type.String);

        }

        return Type.Boolean;

    }

    /**

     *

     */

    public Type getType() {

        return(Type.Boolean);

    }

    /**

     * This method is called when the constructor is compiled in

     * Stylesheet.compileConstructor() and not as the syntax tree is traversed.

     */

    public void translate(ClassGenerator classGen,

                          MethodGenerator methodGen) {

        final ConstantPoolGen cpg = classGen.getConstantPool();

        final InstructionList il = methodGen.getInstructionList();

        final int tst = cpg.addMethodref(BASIS_LIBRARY_CLASS,

                                         "testLanguage",

                                         "("+STRING_SIG+DOM_INTF_SIG+"I)Z");

        _lang.translate(classGen,methodGen);

        il.append(methodGen.loadDOM());

        if (classGen instanceof FilterGenerator)

            il.append(new ILOAD(1));

        else

            il.append(methodGen.loadContextNode());

        il.append(new INVOKESTATIC(tst));

    }

}