/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.jackrabbit.core.query.lucene.constraint;

import javax.jcr.Value;
import javax.jcr.PropertyType;
import javax.jcr.RepositoryException;

import org.apache.jackrabbit.core.query.lucene.ScoreNode;
import org.apache.jackrabbit.core.query.lucene.Util;
import org.apache.jackrabbit.core.state.PropertyState;
import org.apache.jackrabbit.core.value.InternalValue;
import org.apache.jackrabbit.core.value.ValueFactoryImpl;
import org.apache.jackrabbit.spi.QValueFactory;

/**
 * <code>LengthOperand</code> implements a length operand.
 */
public class LengthOperand extends DynamicOperand {

    /**
     * The property value operand for which to return the length.
     */
    private final PropertyValueOperand property;

    /**
     * Creates a new length operand.
     *
     * @param property the operand for which to return the length.
     */
    public LengthOperand(PropertyValueOperand property) {
        super();
        this.property = property;
    }

    /**
     * {@inheritDoc}
     */
    public Value[] getValues(ScoreNode sn, EvaluationContext context)
            throws RepositoryException {
        PropertyState ps = property.getPropertyState(sn, context);
        if (ps == null) {
            return EMPTY;
        } else {
            ValueFactoryImpl vf = (ValueFactoryImpl) context.getSession().getValueFactory();
            QValueFactory qvf = vf.getQValueFactory();
            InternalValue[] values = ps.getValues();
            Value[] lengths = new Value[values.length];
            for (int i = 0; i < lengths.length; i++) {
                long len;
                int type = values[i].getType();
                if (type == PropertyType.NAME) {
                    len = vf.createValue(qvf.create(values[i].getName())).getString().length();
                } else if (type == PropertyType.PATH) {
                    len = vf.createValue(qvf.create(values[i].getPath())).getString().length();
                } else {
                    len = Util.getLength(values[i]);
                }
                lengths[i] = vf.createValue(len);
            }
            return lengths;
        }
    }
}