com.azaptree.services.command.impl.CommandCatalogImpl.java Source code

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Here is the source code for com.azaptree.services.command.impl.CommandCatalogImpl.java

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package com.azaptree.services.command.impl;

/*
 * #%L
 * AZAPTREE-COMMAND-SERVICE
 * %%
 * Copyright (C) 2012 AZAPTREE.COM
 * %%
 * 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.
 * #L%
 */

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.Set;

import org.apache.commons.lang3.builder.ToStringBuilder;
import org.apache.commons.lang3.builder.ToStringStyle;
import org.springframework.stereotype.Component;
import org.springframework.util.Assert;

import com.azaptree.services.command.Command;
import com.azaptree.services.command.CommandCatalog;
import com.google.common.collect.ImmutableMap;

@Component
public class CommandCatalogImpl implements CommandCatalog {
    private final String name;

    private Map<String, org.apache.commons.chain.Command> commands;

    public CommandCatalogImpl(final String name, final Command... commands) {
        Assert.hasText(name, "name is required");
        Assert.notEmpty(commands, "commands are required");
        checkCommandNamesAreUnique(commands);

        this.name = name;

        final ImmutableMap.Builder<String, org.apache.commons.chain.Command> mapBuilder = ImmutableMap.<String, org.apache.commons.chain.Command>builder();
        for (final Command command : commands) {
            Assert.hasText(command.getName(), "command.name is required");
            mapBuilder.put(command.getName(), command);
        }
        this.commands = mapBuilder.build();
    }

    @Override
    public synchronized void addCommand(final Command command) {
        Assert.notNull(command, "command is required");
        Assert.hasText(command.getName(), "command.name is required");
        if (getCommand(command.getName()) != null) {
            throw new IllegalArgumentException(
                    String.format("Command names must be unique within a catalog: %s", command.getName()));
        }
        commands = ImmutableMap.<String, org.apache.commons.chain.Command>builder().putAll(commands)
                .put(command.getName(), command).build();
    }

    @Override
    public synchronized void addCommand(final String name, final org.apache.commons.chain.Command command) {
        Assert.hasText(name, "name is required");
        Assert.notNull(command, "command is required");
        if (getCommand(name) != null) {
            throw new IllegalArgumentException(
                    String.format("Command names must be unique within a catalog: %s", name));
        }
        commands = ImmutableMap.<String, org.apache.commons.chain.Command>builder().putAll(commands)
                .put(name, command).build();
    }

    private void checkCommandNamesAreUnique(final Command[] commands) {
        final Set<String> names = new HashSet<>(commands.length);
        for (final Command command : commands) {
            if (!names.add(command.getName())) {
                throw new IllegalArgumentException(
                        String.format("Command names must be unique within a catalog: %s", command.getName()));
            }
        }
    }

    @Override
    public boolean equals(final Object obj) {
        if (this == obj) {
            return true;
        }
        if (obj == null) {
            return false;
        }
        if (!(obj instanceof CommandCatalogImpl)) {
            return false;
        }
        final CommandCatalogImpl other = (CommandCatalogImpl) obj;
        if (name == null) {
            if (other.name != null) {
                return false;
            }
        } else if (!name.equals(other.name)) {
            return false;
        }
        return true;
    }

    @Override
    public org.apache.commons.chain.Command getCommand(final String name) {
        Assert.hasText(name, "name is required");
        return commands.get(name);
    }

    @Override
    public String[] getCommandNames() {
        final List<String> names = new ArrayList<>(commands.keySet());
        Collections.sort(names);
        return names.toArray(new String[names.size()]);
    }

    @Override
    public String getName() {
        return name;
    }

    @Override
    public Iterator getNames() {
        return commands.keySet().iterator();
    }

    @Override
    public int hashCode() {
        return Objects.hashCode(name);
    }

    @Override
    public String toString() {
        final ToStringBuilder sb = new ToStringBuilder(this, ToStringStyle.MULTI_LINE_STYLE);
        sb.append("name", name);
        sb.append("commandNames", Arrays.toString(getCommandNames()));
        return sb.toString();
    }

}