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Collections support for Querydsl

There is a newer version: 5.1.0

/*
 * Copyright 2015, The Querydsl Team (http://www.querydsl.com/team)
 *
 * 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 com.querydsl.collections;

import static org.hamcrest.core.IsNull.notNullValue;

import org.hamcrest.Description;
import org.hamcrest.Factory;
import org.hamcrest.Matcher;
import org.hamcrest.TypeSafeDiagnosingMatcher;

import com.google.common.base.Function;
import com.querydsl.core.types.Path;

/**
 * Matches based on the current value of a path.
 *
 * @author Jeroen van Schagen
 * @author tiwe
 *
 * @param  type of the path root
 * @param  type of value being matched
 */
public class PathMatcher extends TypeSafeDiagnosingMatcher {

    private final Function accessor;

    private final Matcher matcher;

    private final Path path;

    public PathMatcher(Path path, Matcher matcher) {
        this(path, matcher, GuavaHelpers.wrap(path));
    }

    public PathMatcher(Path path, Matcher matcher, Function accessor) {
        this.path = path;
        this.matcher = matcher;
        this.accessor = accessor;
    }

    @Factory
    public static  Matcher hasValue(Path path) {
        return new PathMatcher(path, notNullValue());
    }

    @Factory
    public static  Matcher hasValue(Path path, Matcher matcher) {
        return new PathMatcher(path, matcher);
    }

    @Override
    protected boolean matchesSafely(T bean, Description mismatchDescription) {
        V value = accessor.apply(bean);
        boolean valueMatches = matcher.matches(value);
        if (!valueMatches) {
            mismatchDescription.appendText("value \"" + path.toString() + "\" ");
            matcher.describeMismatch(value, mismatchDescription);
        }
        return valueMatches;
    }

    @Override
    public void describeTo(Description description) {
        description.appendText("valueOf(");
        description.appendValue(path.toString());
        description.appendText(", ");
        description.appendDescriptionOf(matcher);
        description.appendText(")");
    }

}