com.mgmtp.jfunk.data.generator.constraint.Exists.java Source code

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Here is the source code for com.mgmtp.jfunk.data.generator.constraint.Exists.java

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/*
 * Copyright (c) 2015 mgm technology partners GmbH
 *
 * 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.mgmtp.jfunk.data.generator.constraint;

import org.apache.commons.lang3.StringUtils;
import org.jdom.Element;

import com.mgmtp.jfunk.common.JFunkConstants;
import com.mgmtp.jfunk.common.random.MathRandom;
import com.mgmtp.jfunk.data.generator.Generator;
import com.mgmtp.jfunk.data.generator.constraint.base.SourceConstraint;
import com.mgmtp.jfunk.data.generator.control.FieldCase;

/**
 * This constraint gets a sub-constraint. If the sub-constraint returns a value unequal null, the
 * constraint returns the value {@code true}, if not the value {@code false}. Can be used with a
 * mapping constraint.
 * <p>
 * Example:
 * 
 * <pre>
 * {@code
 * <constraint class="com.mgmtp.jfunk.data.generator.constraint.Exists">
 *   <constraint_ref id="constraint_id"/>
 * </constraint>
 * }
 * </pre>
 * 
 */
public class Exists extends SourceConstraint {

    public Exists(final MathRandom random, final Element element, final Generator generator) {
        super(random, element, generator);
    }

    @Override
    protected String initValuesImpl(final FieldCase c) throws Exception {
        String value = source.initValues(c);
        if (StringUtils.isNotEmpty(value)) {
            return JFunkConstants.TRUE;
        }
        return JFunkConstants.FALSE;
    }

    /**
     * Always returns 1.
     */
    @Override
    public int countCases() {
        return 1;
    }

    /**
     * Always returns false.
     */
    @Override
    public boolean hasNextCase() {
        return false;
    }
}