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Java example source code file (TransletOutput.java)

This example Java source code file (TransletOutput.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

castexpr, constantpoolgen, expression, instruction, invokestatic, invokevirtual, push, string, string_sig, stringtype, translet_output_sig, transletoutput, type, typecheckerror

The TransletOutput.java Java example source code

/*
 * reserved comment block
 * DO NOT REMOVE OR ALTER!
 */
/*
 * Copyright 2001-2004 The Apache Software Foundation.
 *
 * 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.
 */
/*
 * $Id: TransletOutput.java,v 1.2.4.1 2005/09/05 09:19:44 pvedula Exp $
 */

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.INVOKESTATIC;
import com.sun.org.apache.bcel.internal.generic.INVOKEVIRTUAL;
import com.sun.org.apache.bcel.internal.generic.InstructionList;
import com.sun.org.apache.bcel.internal.generic.PUSH;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ClassGenerator;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ErrorMsg;
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;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.Util;

/**
 * @author Morten Jorgensen
 */
final class TransletOutput extends Instruction {

    private Expression _filename;
    private boolean _append;

    /**
     * Displays the contents of this <xsltc:output> element.
     */
    public void display(int indent) {
        indent(indent);
        Util.println("TransletOutput: " + _filename);
    }

    /**
     * Parse the contents of this <xsltc:output> element. The only attribute
     * we recognise is the 'file' attribute that contains teh output filename.
     */
    public void parseContents(Parser parser) {
        // Get the output filename from the 'file' attribute
        String filename = getAttribute("file");

        // If the 'append' attribute is set to "yes" or "true",
        // the output is appended to the file.
        String append   = getAttribute("append");

        // Verify that the filename is in fact set
        if ((filename == null) || (filename.equals(EMPTYSTRING))) {
            reportError(this, parser, ErrorMsg.REQUIRED_ATTR_ERR, "file");
        }

        // Save filename as an attribute value template
        _filename = AttributeValue.create(this, filename, parser);

        if (append != null && (append.toLowerCase().equals("yes") ||
            append.toLowerCase().equals("true"))) {
          _append = true;
        }
        else
          _append = false;

        parseChildren(parser);
    }

    /**
     * Type checks the 'file' attribute (must be able to convert it to a str).
     */
    public Type typeCheck(SymbolTable stable) throws TypeCheckError {
        final Type type = _filename.typeCheck(stable);
        if (type instanceof StringType == false) {
            _filename = new CastExpr(_filename, Type.String);
        }
        typeCheckContents(stable);
        return Type.Void;
    }

    /**
     * Compile code that opens the give file for output, dumps the contents of
     * the element to the file, then closes the file.
     */
    public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
        final ConstantPoolGen cpg = classGen.getConstantPool();
        final InstructionList il = methodGen.getInstructionList();
        final boolean isSecureProcessing = classGen.getParser().getXSLTC()
                                           .isSecureProcessing();

        if (isSecureProcessing) {
            int index = cpg.addMethodref(BASIS_LIBRARY_CLASS,
                                         "unallowed_extension_elementF",
                                         "(Ljava/lang/String;)V");
            il.append(new PUSH(cpg, "redirect"));
            il.append(new INVOKESTATIC(index));
            return;
        }

        // Save the current output handler on the stack
        il.append(methodGen.loadHandler());

        final int open =  cpg.addMethodref(TRANSLET_CLASS,
                                           "openOutputHandler",
                                           "(" + STRING_SIG + "Z)" +
                                           TRANSLET_OUTPUT_SIG);

        final int close =  cpg.addMethodref(TRANSLET_CLASS,
                                            "closeOutputHandler",
                                            "("+TRANSLET_OUTPUT_SIG+")V");

        // Create the new output handler (leave it on stack)
        il.append(classGen.loadTranslet());
        _filename.translate(classGen, methodGen);
        il.append(new PUSH(cpg, _append));
        il.append(new INVOKEVIRTUAL(open));

        // Overwrite current handler
        il.append(methodGen.storeHandler());

        // Translate contents with substituted handler
        translateContents(classGen, methodGen);

        // Close the output handler (close file)
        il.append(classGen.loadTranslet());
        il.append(methodGen.loadHandler());
        il.append(new INVOKEVIRTUAL(close));

        // Restore old output handler from stack
        il.append(methodGen.storeHandler());
    }
}

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