com.moz.fiji.schema.impl.FijiResultRowScanner.java Source code

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Here is the source code for com.moz.fiji.schema.impl.FijiResultRowScanner.java

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/**
 * (c) Copyright 2014 WibiData, Inc.
 *
 * See the NOTICE file distributed with this work for additional
 * information regarding copyright ownership.
 *
 * 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.moz.fiji.schema.impl;

import java.io.IOException;
import java.util.Iterator;

import com.google.common.base.Function;
import com.google.common.base.Objects;
import com.google.common.collect.Iterators;

import com.moz.fiji.annotations.ApiAudience;
import com.moz.fiji.schema.FijiResult;
import com.moz.fiji.schema.FijiResultScanner;
import com.moz.fiji.schema.FijiRowData;
import com.moz.fiji.schema.FijiRowScanner;
import com.moz.fiji.schema.layout.FijiTableLayout;

/**
 * A {@code FijiRowScanner} implementation backed by a {@code FijiResultScanner}.
 */
@ApiAudience.Private
public class FijiResultRowScanner implements FijiRowScanner {
    private final Iterator<FijiRowData> mResultRowScanner;
    private final FijiResultScanner<Object> mResultScanner;
    private final FijiTableLayout mLayout;

    /**
     * Constructor for {@code FijiResultRowScanner}.
     *
     * @param layout The {@code FijiTableLayout} for the table.
     * @param resultScanner The {@code FijiResultScanner} backing this {@code FijiRowScanner}. This
     * {@code FijiResultScanner} is owned by the newly created {@code FijiResultRowScanner} and
     * calling close on this {@code FijiResultRowScanner} will close the underlying
     * {@code FijiResultScanner}.
     */
    public FijiResultRowScanner(final FijiTableLayout layout, final FijiResultScanner<Object> resultScanner) {
        mLayout = layout;
        mResultScanner = resultScanner;
        mResultRowScanner = Iterators.transform(resultScanner, new Function<FijiResult<Object>, FijiRowData>() {
            @Override
            public FijiRowData apply(final FijiResult<Object> result) {
                return new FijiResultRowData(mLayout, result);
            }
        });
    }

    /** {@inheritDoc} */
    @Override
    public Iterator<FijiRowData> iterator() {
        return mResultRowScanner;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void close() throws IOException {
        mResultScanner.close();
    }

    /** {@inheritDoc} */
    @Override
    public int hashCode() {
        return Objects.hashCode(mLayout, mResultRowScanner);
    }

    /** {@inheritDoc} */
    @Override
    public boolean equals(final Object obj) {
        if (this == obj) {
            return true;
        }
        if (obj == null || getClass() != obj.getClass()) {
            return false;
        }
        final FijiResultRowScanner other = (FijiResultRowScanner) obj;
        return Objects.equal(this.mLayout, other.mLayout)
                && Objects.equal(this.mResultRowScanner, other.mResultRowScanner);
    }

    /** {@inheritDoc} */
    @Override
    public String toString() {
        return Objects.toStringHelper(this).add("mLayout", mLayout).add("mResultRowScanner", mResultRowScanner)
                .toString();
    }
}