org.pentaho.di.trans.dataservice.ui.BindingConverters.java Source code

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/*! ******************************************************************************
 *
 * Pentaho Data Integration
 *
 * Copyright (C) 2002-2015 by Pentaho : http://www.pentaho.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 org.pentaho.di.trans.dataservice.ui;

import com.google.common.base.Strings;
import org.pentaho.ui.xul.binding.BindingConvertor;

import java.util.Map;
import java.util.Set;

/**
 * @author nhudak
 */
public class BindingConverters {

    private BindingConverters() {
    }

    public static BindingConvertor<String, Boolean> stringIsEmpty() {
        return new BindingConvertor<String, Boolean>() {
            @Override
            public Boolean sourceToTarget(String value) {
                return Strings.isNullOrEmpty(value);
            }

            @Override
            public String targetToSource(Boolean value) {
                throw new AbstractMethodError("Boolean to String conversion is not supported");
            }
        };
    }

    public static BindingConvertor<Boolean, Boolean> not() {
        return new BindingConvertor<Boolean, Boolean>() {
            @Override
            public Boolean sourceToTarget(Boolean value) {
                return !value;
            }

            @Override
            public Boolean targetToSource(Boolean value) {
                return !value;
            }
        };
    }

    public static <K, V> BindingConvertor<Map<K, V>, Set<K>> keySet() {
        return new BindingConvertor<Map<K, V>, Set<K>>() {
            @Override
            public Set<K> sourceToTarget(Map<K, V> value) {
                return value.keySet();
            }

            @Override
            public Map<K, V> targetToSource(Set<K> value) {
                throw new AbstractMethodError("Unable to convert a set to a map");
            }
        };
    }
}