src/main/java/org/apache/sling/query/impl/resource/jcr/query/Formula.java

/*-
 * 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.sling.query.impl.resource.jcr.query;

import java.util.Iterator;
import java.util.List;

public class Formula implements Term {
    public enum Operator {
        AND, OR
    }

    private final Operator operator;

    private final List<Term> conditions;

    public Formula(Operator operator, List<Term> conditions) {
        this.operator = operator;
        this.conditions = conditions;
    }

    public String buildString() {
        if (conditions.isEmpty()) {
            return "";
        }

        StringBuilder builder = new StringBuilder();
        Iterator<Term> iterator = conditions.iterator();
        if (conditions.size() > 1) {
            builder.append("(");
        }
        while (iterator.hasNext()) {
            Term term = iterator.next();
            builder.append(term.buildString());
            if (iterator.hasNext()) {
                builder.append(' ').append(operator.toString()).append(' ');
            }
        }
        if (conditions.size() > 1) {
            builder.append(")");
        }
        return builder.toString();
    }
}