QueryClassProperty.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.ignite.internal.processors.query.property;

import org.apache.ignite.IgniteCheckedException;
import org.apache.ignite.internal.processors.cache.CacheObject;
import org.apache.ignite.internal.processors.cache.CacheObjectContext;
import org.apache.ignite.internal.processors.query.GridQueryProperty;
import org.apache.ignite.internal.util.typedef.F;
import org.apache.ignite.internal.util.typedef.internal.S;
import org.jetbrains.annotations.Nullable;

/**
 * Description of type property.
 */
public class QueryClassProperty implements GridQueryProperty {
    /** */
    private final QueryPropertyAccessor accessor;

    /** */
    private final boolean key;

    /** */
    private QueryClassProperty parent;

    /** */
    private final String name;

    /** */
    private final CacheObjectContext coCtx;

    /**
     * Constructor.
     *
     * @param accessor Way of accessing the property.
     */
    public QueryClassProperty(QueryPropertyAccessor accessor, boolean key, String name,
        @Nullable CacheObjectContext coCtx) {
        this.accessor = accessor;

        this.key = key;

        this.name = !F.isEmpty(name) ? name : accessor.getPropertyName();

        this.coCtx = coCtx;
    }

    /** {@inheritDoc} */
    @Override public Object value(Object key, Object val) throws IgniteCheckedException {
        Object x = unwrap(this.key ? key : val);

        if (parent != null)
            x = parent.value(key, val);

        if (x == null)
            return null;

        return accessor.getValue(x);
    }

    /** {@inheritDoc} */
    @Override public void setValue(Object key, Object val, Object propVal) throws IgniteCheckedException {
        Object x = unwrap(this.key ? key : val);

        if (parent != null)
            x = parent.value(key, val);

        if (x == null)
            return;

        accessor.setValue(x, propVal);
    }

    /** {@inheritDoc} */
    @Override public boolean key() {
        return key;
    }

    /**
     * Unwraps cache object, if needed.
     *
     * @param o Object to unwrap.
     * @return Unwrapped object.
     */
    private Object unwrap(Object o) {
        return coCtx == null ? o : o instanceof CacheObject ? ((CacheObject)o).value(coCtx, false) : o;
    }

    /** {@inheritDoc} */
    @Override public String name() {
        return name;
    }

    /** {@inheritDoc} */
    @Override public Class<?> type() {
        return accessor.getType();
    }

    /**
     * @param parent Parent property if this is embeddable element.
     */
    public void parent(QueryClassProperty parent) {
        this.parent = parent;
    }

    /** {@inheritDoc} */
    @Override public String toString() {
        return S.toString(QueryClassProperty.class, this);
    }

    /** {@inheritDoc} */
    @Override public GridQueryProperty parent() {
        return parent;
    }
}