UpdateElementPropertyValueCommand.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 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.definition.adapter.PropertyAdapter;
import org.kie.workbench.common.stunner.core.graph.Edge;
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.graph.util.GraphUtils;
import org.kie.workbench.common.stunner.core.rule.RuleViolation;
import org.uberfire.commons.validation.PortablePreconditions;

/**
 * A Command to update an element's property.
 */
@Portable
public final class UpdateElementPropertyValueCommand extends AbstractGraphCommand {

    private final String elementUUID;
    private final String propertyId;
    private final Object value;
    private Object oldValue;
    private transient Node<?, Edge> node;

    public UpdateElementPropertyValueCommand(final @MapsTo("elementUUID") String elementUUID,
                                             final @MapsTo("propertyId") String propertyId,
                                             final @MapsTo("value") Object value) {
        this.elementUUID = PortablePreconditions.checkNotNull("elementUUID",
                                                              elementUUID);
        this.propertyId = PortablePreconditions.checkNotNull("propertyId",
                                                             propertyId);
        this.value = PortablePreconditions.checkNotNull("value",
                                                        value);
        this.node = null;
    }

    public UpdateElementPropertyValueCommand(final Node<?, Edge> node,
                                             final String propertyId,
                                             final Object value) {
        this(node.getUUID(),
             propertyId,
             value);
        this.node = node;
    }

    @Override
    protected CommandResult<RuleViolation> check(final GraphCommandExecutionContext context) {
        checkNodeNotNull(context);
        return GraphCommandResultBuilder.SUCCESS;
    }

    @Override
    @SuppressWarnings("unchecked")
    public CommandResult<RuleViolation> execute(final GraphCommandExecutionContext context) {
        final Element<Definition<?>> element = (Element<Definition<?>>) checkNodeNotNull(context);
        final Object p = GraphUtils.getProperty(context.getDefinitionManager(),
                                                element,
                                                propertyId);
        final PropertyAdapter<Object, Object> adapter = (PropertyAdapter<Object, Object>) context.getDefinitionManager().adapters().registry().getPropertyAdapter(p.getClass());
        oldValue = adapter.getValue(p);
        adapter.setValue(p,
                         value);
        return GraphCommandResultBuilder.SUCCESS;
    }

    @Override
    public CommandResult<RuleViolation> undo(final GraphCommandExecutionContext context) {
        final UpdateElementPropertyValueCommand undoCommand = new UpdateElementPropertyValueCommand(checkNodeNotNull(context),
                                                                                                    propertyId,
                                                                                                    oldValue);
        return undoCommand.execute(context);
    }

    public Object getOldValue() {
        return oldValue;
    }

    private Node<?, Edge> checkNodeNotNull(final GraphCommandExecutionContext context) {
        if (null == node) {
            node = super.checkNodeNotNull(context,
                                          elementUUID);
        }
        return node;
    }

    @Override
    public String toString() {
        return "UpdateElementPropertyValueCommand [element=" + elementUUID + ", property=" + propertyId + ", value=" + value + "]";
    }
}