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Groovy: A powerful, dynamic language for the JVM

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/*
 *  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.codehaus.groovy.control.messages;

import org.codehaus.groovy.control.Janitor;
import org.codehaus.groovy.control.ProcessingUnit;
import org.codehaus.groovy.control.SourceUnit;
import org.codehaus.groovy.syntax.SyntaxException;

import java.io.PrintWriter;

/**
 * A base class for compilation messages.
 */
public abstract class Message {

    /**
     * Writes the message to the specified PrintWriter.  The supplied
     * ProcessingUnit is the unit that holds this Message.
     */
    public abstract void write(PrintWriter writer, Janitor janitor);

    /**
     * A synonym for write( writer, owner, null ).
     */
    public final void write(PrintWriter writer) {
        write(writer, null);
    }

    //---------------------------------------------------------------------------
    // FACTORY METHODS

    /**
     * Creates a new Message from the specified text.
     */
    public static Message create(String text, ProcessingUnit owner) {
        return new SimpleMessage(text, owner);
    }

    /**
     * Creates a new Message from the specified text.
     */
    public static Message create(String text, Object data, ProcessingUnit owner) {
        return new SimpleMessage(text, data, owner);
    }

    /**
     * Creates a new Message from the specified SyntaxException.
     */
    public static Message create(SyntaxException error, SourceUnit owner) {
        return new SyntaxErrorMessage(error, owner);
    }

}