AddNodeCommand.java

/*
 * Copyright 2016 Red Hat, Inc. and/or its affiliates.
 *
 * 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 org.kie.workbench.common.stunner.core.graph.command.impl;

import java.util.Collection;

import org.jboss.errai.common.client.api.annotations.MapsTo;
import org.jboss.errai.common.client.api.annotations.Portable;
import org.kie.workbench.common.stunner.core.command.CommandResult;
import org.kie.workbench.common.stunner.core.graph.Element;
import org.kie.workbench.common.stunner.core.graph.Node;
import org.kie.workbench.common.stunner.core.graph.command.GraphCommandExecutionContext;
import org.kie.workbench.common.stunner.core.graph.command.GraphCommandResultBuilder;
import org.kie.workbench.common.stunner.core.graph.content.definition.Definition;
import org.kie.workbench.common.stunner.core.rule.RuleViolation;
import org.kie.workbench.common.stunner.core.rule.context.impl.RuleContextBuilder;

/**
 * A Command to add a node as a child for the main graph instance.
 * It check parent cardinality rules and containment rules as we..
 */
@Portable
public final class AddNodeCommand extends RegisterNodeCommand {

    public AddNodeCommand(final @MapsTo("candidate") Node candidate) {
        super(candidate);
    }

    @SuppressWarnings("unchecked")
    protected CommandResult<RuleViolation> check(final GraphCommandExecutionContext context) {
        final CommandResult<RuleViolation> parentResult = super.check(context);
        final GraphCommandResultBuilder builder = new GraphCommandResultBuilder();
        parentResult.getViolations().forEach(builder::addViolation);
        final Element<? extends Definition<?>> graph = (Element<? extends Definition<?>>) getGraph(context);
        final Collection<RuleViolation> containmentRuleViolations =
                doEvaluate(context,
                           RuleContextBuilder.GraphContexts.containment(getGraph(context),
                                                                        graph,
                                                                        getCandidate()));
        builder.addViolations(containmentRuleViolations);
        return builder.build();
    }

    @Override
    @SuppressWarnings("unchecked")
    public CommandResult<RuleViolation> undo(final GraphCommandExecutionContext context) {
        final SafeDeleteNodeCommand undoCommand = new SafeDeleteNodeCommand(getCandidate());
        return undoCommand.execute(context);
    }

    @Override
    public String toString() {
        return "AddNodeCommand [candidate=" + getCandidate().getUUID() + "]";
    }
}