/*
 * Copyright 2009-2016 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.eclipse.dsl.pointcuts.impl;

import java.util.Collection;
import java.util.Collections;

import org.codehaus.groovy.eclipse.dsl.pointcuts.AbstractPointcut;
import org.codehaus.groovy.eclipse.dsl.pointcuts.GroovyDSLDContext;
import org.codehaus.groovy.eclipse.dsl.pointcuts.PointcutVerificationException;
import org.eclipse.core.resources.IStorage;

/**
 * Tests that the file currently being checked ends in the given extension.
 * Do not include the dot in the pointcut, but the dot must exist before the extension
 * This pointcut should be optimized so that it runs before any others in an 'and' or 'or' clause.  Also, its result should be cached in the 
 * pattern providing a fail/succeed fast strategy.
 * @author andrew
 * @created Feb 10, 2011
 */
public class FileExtensionPointcut extends AbstractPointcut {

    public FileExtensionPointcut(IStorage containerIdentifier, String pointcutName) {
        super(containerIdentifier, pointcutName);
    }

    @Override
    public Collection<?> matches(GroovyDSLDContext pattern, Object toMatch) {
        if (pattern.fullPathName != null && pattern.fullPathName.endsWith("." + (String) getFirstArgument())) {
            return Collections.singleton(pattern.fullPathName);
        } else {
            return null;
        }
    }
    
    @Override
    public boolean fastMatch(GroovyDSLDContext pattern) {
        return matches(pattern, null) != null;
    }

    @Override
    public void verify() throws PointcutVerificationException {
        String maybeStatus = allArgsAreStrings();
        if (maybeStatus != null) {
            throw new PointcutVerificationException(maybeStatus, this);
        }
        maybeStatus = hasOneArg();
        if (maybeStatus != null) {
            throw new PointcutVerificationException(maybeStatus, this);
        }
        super.verify();
    }
}