com.spotify.helios.cli.Table.java Source code

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Here is the source code for com.spotify.helios.cli.Table.java

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/*
 * Copyright (c) 2014 Spotify AB.
 *
 * 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.spotify.helios.cli;

import static java.lang.Math.max;

import com.google.common.base.Strings;
import com.google.common.collect.Lists;
import com.google.common.primitives.Ints;

import java.io.PrintStream;
import java.util.List;

/**
 * Produces tabulated output, adding padding to cells as necessary to align them into columns.
 */

public class Table {

    private final PrintStream out;
    private final String paddingString;
    private int[] columns = new int[0];
    private final List<Object[]> rows = Lists.newArrayList();

    public Table(final PrintStream out, final int padding) {
        this.out = out;
        this.paddingString = Strings.repeat(" ", padding);
    }

    public Table(final PrintStream out) {
        this(out, 4);
    }

    public void row(final Object... row) {
        columns = Ints.ensureCapacity(columns, row.length, row.length);
        for (int i = 0; i < row.length; i++) {
            row[i] = row[i].toString();
            columns[i] = max(columns[i], row[i].toString().length());
        }
        rows.add(row);
    }

    public void print() {
        for (final Object[] row : rows) {
            for (int i = 0; i < row.length; i++) {
                final String cell = row[i].toString();
                out.print(cell);
                out.print(paddingString);
                final int padding = columns[i] - cell.length();
                for (int j = 0; j < padding; j++) {
                    out.print(' ');
                }
            }
            out.println();
        }
    }
}