/*
* 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.addthis.hydra.data.filter.value;
import com.addthis.bundle.value.ValueArray;
import com.addthis.bundle.value.ValueFactory;
import com.addthis.bundle.value.ValueObject;
/**
* This {@link AbstractValueFilter ValueFilter} <span class="hydra-summary">reverses a string or an array</span>.
* <p/>
* <p>Example:</p>
* <pre>
* {from:"TEXT", reverse {}},
* </pre>
*
* @user-reference
*/
public class ValueFilterReverse extends AbstractValueFilter {
@Override
public ValueObject filterValue(ValueObject value) {
if (value == null) {
return null;
}
if (value.getObjectType() == ValueObject.TYPE.ARRAY) {
ValueArray arr = value.asArray();
int size = arr.size();
int half = size / 2;
for (int i = 0; i < half; i++) {
int altpos = size - i - 1;
ValueObject tmp = arr.get(i);
arr.set(i, arr.get(altpos));
arr.set(altpos, tmp);
}
return arr;
} else if (value.getObjectType() == ValueObject.TYPE.STRING) {
return ValueFactory.create(new StringBuilder(value.toString()).reverse().toString());
}
return value;
}
}