org.basepom.mojo.propertyhelper.UuidField.java Source code

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Here is the source code for org.basepom.mojo.propertyhelper.UuidField.java

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/*
 * 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.basepom.mojo.propertyhelper;

import static com.google.common.base.Preconditions.checkNotNull;

import java.io.IOException;
import java.util.List;
import java.util.UUID;

import org.basepom.mojo.propertyhelper.beans.UuidDefinition;

import com.google.common.base.Optional;
import com.google.common.collect.ImmutableList;

public class UuidField implements PropertyElement {
    private final UuidDefinition uuidDefinition;
    private final ValueProvider valueProvider;

    public static List<UuidField> createUuids(final ValueCache valueCache, final UuidDefinition[] uuidDefinitions)
            throws IOException {
        checkNotNull(valueCache, "valueCache is null");
        checkNotNull(uuidDefinitions, "uuidDefinitions is null");

        final ImmutableList.Builder<UuidField> result = ImmutableList.builder();

        for (UuidDefinition uuidDefinition : uuidDefinitions) {
            uuidDefinition.check();
            final ValueProvider uuidValue = valueCache.getValueProvider(uuidDefinition);
            final UuidField uuidField = new UuidField(uuidDefinition, uuidValue);
            result.add(uuidField);
        }

        return result.build();
    }

    public UuidField(final UuidDefinition uuidDefinition, final ValueProvider valueProvider) {
        this.uuidDefinition = checkNotNull(uuidDefinition, "uuidDefinition is null");
        this.valueProvider = checkNotNull(valueProvider, "valueProvider is null");
    }

    @Override
    public String getPropertyName() {
        return uuidDefinition.getId();
    }

    @Override
    public Optional<String> getPropertyValue() {
        // Only add the value from the provider if it is not null.
        UUID result = null;
        final Optional<String> propValue = valueProvider.getValue();

        if (propValue.isPresent()) {
            result = UUID.fromString(propValue.get());
        }

        if (result == null) {
            final Optional<UUID> definedValue = uuidDefinition.getValue();
            if (definedValue.isPresent()) {
                result = definedValue.get();
            }
        }

        if (result == null) {
            result = UUID.randomUUID();
        }

        valueProvider.setValue(result.toString());
        return uuidDefinition.formatResult(result.toString());
    }

    @Override
    public boolean isExport() {
        return uuidDefinition.isExport();
    }

    @Override
    public String toString() {
        return getPropertyValue().or("");
    }
}