com.complexible.common.base.Preconditions2.java Source code

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Here is the source code for com.complexible.common.base.Preconditions2.java

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/*
 * Copyright (c) 2005-2011 Clark & Parsia, LLC. <http://www.clarkparsia.com>
 *
 * 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.complexible.common.base;

import java.lang.reflect.InvocationTargetException;

import com.google.common.base.Predicate;
import com.google.common.base.Preconditions;
import com.google.common.collect.Iterables;

/**
 * <p>Additional precondition checks to extend Guava Preconditions</p>
 *
 * @author Michael Grove
 * @version 2.0
 * @since 2.0
 */
public final class Preconditions2 {

    /**
     * Private constructor
     */
    private Preconditions2() {
    }

    public static <S, T extends Exception> void check(final Iterable<S> theObject, final Predicate<S> thePredicate,
            Class<T> theExceptionType) throws T {
        check(Iterables.any(theObject, thePredicate), theExceptionType, null);
    }

    public static <S, T extends Exception> void check(final Iterable<S> theObject, final Predicate<S> thePredicate,
            final Class<T> theExceptionType, final String theMessage, final Object... theArgs) throws T {
        check(Iterables.any(theObject, thePredicate), theExceptionType, theMessage, theArgs);
    }

    public static <S, T extends Exception> void check(final S theObject, final Predicate<S> thePredicate,
            Class<T> theExceptionType) throws T {
        check(thePredicate.apply(theObject), theExceptionType, null);
    }

    public static <S, T extends Exception> void check(final S theObject, final Predicate<S> thePredicate,
            final Class<T> theExceptionType, final String theMessage, final Object... theArgs) throws T {
        check(thePredicate.apply(theObject), theExceptionType, theMessage, theArgs);
    }

    public static <T extends Exception> void check(final boolean theBoolean, Class<T> theExceptionType) throws T {
        check(theBoolean, theExceptionType, null);
    }

    public static <T extends Exception> void check(final boolean theBoolean, Class<T> theExceptionType,
            final String theMessage, final Object... theArgs) throws T {
        if (!theBoolean) {
            createAndThrowException(theExceptionType, theMessage, theArgs);
        }
    }

    private static <T extends Exception> void createAndThrowException(final Class<T> theExceptionType,
            final String theMessage, final Object[] theArgs) throws T {
        if (theMessage != null) {
            String aMsg = String.format(theMessage, theArgs);

            try {
                throw theExceptionType.getConstructor(String.class).newInstance(aMsg);
            } catch (InstantiationException e) {
                throw new IllegalArgumentException(e);
            } catch (IllegalAccessException e) {
                throw new IllegalArgumentException(e);
            } catch (InvocationTargetException e) {
                throw new IllegalArgumentException(e);
            } catch (NoSuchMethodException e) {
                try {
                    throw theExceptionType.newInstance();
                } catch (InstantiationException e1) {
                    throw new IllegalArgumentException(e);
                } catch (IllegalAccessException e1) {
                    throw new IllegalArgumentException(e);
                }
            }
        } else {
            try {
                throw theExceptionType.newInstance();
            } catch (InstantiationException e) {
                throw new IllegalArgumentException(e);
            } catch (IllegalAccessException e) {
                throw new IllegalArgumentException(e);
            }
        }
    }

    public static <T> T[] checkNotEmpty(final T[] theArray) {
        if (theArray == null || theArray.length == 0) {
            throw new IllegalArgumentException();
        }

        return theArray;
    }
}