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/*
 * Copyright 2003-2013 the original author or authors.
 *
 * 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.
 */
package org.codehaus.groovy.control.customizers;

import groovy.lang.Closure;
import org.codehaus.groovy.ast.ClassNode;
import org.codehaus.groovy.classgen.GeneratorContext;
import org.codehaus.groovy.control.CompilationFailedException;
import org.codehaus.groovy.control.SourceUnit;
import org.codehaus.groovy.control.io.FileReaderSource;
import org.codehaus.groovy.control.io.ReaderSource;

/**
 * A base class for customizers which only have to be applied on specific source units.
 * This is for example useful if you want a customizer to be applied only for files
 * matching some extensions.
 * 
 * For convenience, this class implements several methods that you may extend to customize
 * the behaviour of this utility. For example, if you want to apply a customizer only
 * for classes matching the '.foo' file extension, then you only have to override the
 * {@link #acceptExtension(String)} method:
 * 
return "foo".equals(extension)
 *
 * @since 2.1.0
 * @author Cedric Champeau
 */
public class SourceAwareCustomizer extends DelegatingCustomizer {

    private Closure extensionValidator;
    private Closure baseNameValidator;
    private Closure sourceUnitValidator;

    public SourceAwareCustomizer(CompilationCustomizer delegate) {
        super(delegate);
    }

    @Override
    public void call(final SourceUnit source, final GeneratorContext context, final ClassNode classNode) throws CompilationFailedException {
        String fileName = source.getName();
        ReaderSource reader = source.getSource();
        if (reader instanceof FileReaderSource) {
            FileReaderSource file = (FileReaderSource) reader;
            fileName = file.getFile().getName();
        }
        if (acceptSource(source) && accept(fileName)) {
            delegate.call(source, context, classNode);
        }
    }

    public void setBaseNameValidator(final Closure baseNameValidator) {
        this.baseNameValidator = baseNameValidator;
    }

    public void setExtensionValidator(final Closure extensionValidator) {
        this.extensionValidator = extensionValidator;
    }

    public void setSourceUnitValidator(final Closure sourceUnitValidator) {
        this.sourceUnitValidator = sourceUnitValidator;
    }

    public boolean accept(String fileName) {
        int ext = fileName.lastIndexOf(".");
        String baseName = ext<0?fileName:fileName.substring(0, ext);
        String extension = ext<0?"":fileName.substring(ext+1);
        return acceptExtension(extension) && acceptBaseName(baseName);
    }

    public boolean acceptSource(SourceUnit unit) {
        return sourceUnitValidator==null || sourceUnitValidator.call(unit);
    }

    public boolean acceptExtension(String extension) {
        return extensionValidator==null || extensionValidator.call(extension);
    }

    public boolean acceptBaseName(String baseName) {
        return baseNameValidator==null || baseNameValidator.call(baseName);
    }
}