Add MonitoredResourceDescriptor class and tests (#1062)

* Add MonitoredResourceDescriptor class and tests

* Move MonitoredResourceDescriptor to core module

gcloud-java-core/pom.xml

@@ -108,5 +108,10 @@
       <artifactId>gax</artifactId>
       <version>0.0.13</version>
     </dependency>
+    <dependency>
+      <groupId>com.google.api.grpc</groupId>
+      <artifactId>grpc-core-proto</artifactId>
+      <version>0.0.4</version>
+    </dependency>
   </dependencies>
 </project>

gcloud-java-core/src/main/java/com/google/cloud/MonitoredResourceDescriptor.java

@@ -0,0 +1,345 @@
+/*
+ * Copyright 2016 Google Inc. All Rights Reserved.
+ *
+ * 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.google.cloud;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+
+import com.google.common.base.Function;
+import com.google.common.base.MoreObjects;
+import com.google.common.collect.Iterables;
+import com.google.common.collect.Lists;
+
+import java.io.Serializable;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Objects;
+
+/**
+ * This class describes the schema of Cloud monitored resources. Monitored resource descriptors
+ * contain a type name and a set of labels. For example, the monitored resource descriptor for
+ * Google Compute Engine VM instances has a type of {@code gce_instance} and specifies the use of
+ * the labels {@code instance_id} and {@code zone} to identify particular VM instances.
+ */
+public class MonitoredResourceDescriptor implements Serializable {
+
+  private static final long serialVersionUID = -3702077512777687441L;
+  public static final Function<com.google.api.MonitoredResourceDescriptor,
+      MonitoredResourceDescriptor> FROM_PB_FUNCTION =
+          new Function<com.google.api.MonitoredResourceDescriptor, MonitoredResourceDescriptor>() {
+            @Override
+            public MonitoredResourceDescriptor apply(
+                com.google.api.MonitoredResourceDescriptor pb) {
+              return fromPb(pb);
+            }
+          };
+
+  private final String type;
+  private final String name;
+  private final String displayName;
+  private final String description;
+  private final List<LabelDescriptor> labels;
+
+  /**
+   * This class describes a label for a monitored resource. Label descriptors contain the key for
+   * the label, the type of data that the label can hold and an optional description.
+   */
+  public static class LabelDescriptor implements Serializable {
+
+    private static final long serialVersionUID = -2811608103754481777L;
+    private static final Function<com.google.api.LabelDescriptor, LabelDescriptor>
+        FROM_PB_FUNCTION = new Function<com.google.api.LabelDescriptor, LabelDescriptor>() {
+          @Override
+          public LabelDescriptor apply(com.google.api.LabelDescriptor descriptorPb) {
+            return fromPb(descriptorPb);
+          }
+        };
+    private static final Function<LabelDescriptor, com.google.api.LabelDescriptor>
+        TO_PB_FUNCTION = new Function<LabelDescriptor, com.google.api.LabelDescriptor>() {
+          @Override
+          public com.google.api.LabelDescriptor apply(LabelDescriptor descriptor) {
+            return descriptor.toPb();
+          }
+        };
+
+    private final String key;
+    private final ValueType valueType;
+    private final String description;
+
+    /**
+     * Value types that can be used as label values.
+     */
+    public enum ValueType {
+      STRING(com.google.api.LabelDescriptor.ValueType.STRING),
+      BOOL(com.google.api.LabelDescriptor.ValueType.BOOL),
+      INT64(com.google.api.LabelDescriptor.ValueType.INT64);
+
+      private com.google.api.LabelDescriptor.ValueType typePb;
+
+      ValueType(com.google.api.LabelDescriptor.ValueType typePb) {
+        this.typePb = typePb;
+      }
+
+      com.google.api.LabelDescriptor.ValueType toPb() {
+        return typePb;
+      }
+
+      static ValueType fromPb(com.google.api.LabelDescriptor.ValueType typePb) {
+        switch (typePb) {
+          case STRING:
+            return ValueType.STRING;
+          case BOOL:
+            return ValueType.BOOL;
+          case INT64:
+            return ValueType.INT64;
+          default:
+            throw new IllegalArgumentException("Unrecognized label type");
+        }
+      }
+    }
+
+    LabelDescriptor(String key, ValueType valueType, String description) {
+      this.key = checkNotNull(key);
+      this.valueType = checkNotNull(valueType);
+      this.description = description;
+    }
+
+    /**
+     * Returns the key associated to this label.
+     */
+    public String key() {
+      return key;
+    }
+
+    /**
+     * Returns the type of data that can be assigned to this label.
+     */
+    public ValueType valueType() {
+      return valueType;
+    }
+
+    /**
+     * Returns the optional human-readable description for this label. If not set, this method
+     * returns {@code null}.
+     */
+    public String description() {
+      return description;
+    }
+
+    @Override
+    public final int hashCode() {
+      return Objects.hash(key, valueType, description);
+    }
+
+    @Override
+    public final boolean equals(Object obj) {
+      if (obj == this) {
+        return true;
+      }
+      if (obj == null || !obj.getClass().equals(LabelDescriptor.class)) {
+        return false;
+      }
+      LabelDescriptor other = (LabelDescriptor) obj;
+      return Objects.equals(key, other.key)
+          && Objects.equals(valueType, other.valueType)
+          && Objects.equals(description, other.description);
+    }
+
+    @Override
+    public String toString() {
+      return MoreObjects.toStringHelper(this)
+          .add("key", key)
+          .add("valueType", valueType)
+          .add("description", description)
+          .toString();
+    }
+
+    com.google.api.LabelDescriptor toPb() {
+      com.google.api.LabelDescriptor.Builder builder = com.google.api.LabelDescriptor.newBuilder()
+          .setKey(key)
+          .setValueType(valueType.toPb());
+      if (description != null) {
+        builder.setDescription(description);
+      }
+      return builder.build();
+    }
+
+    static LabelDescriptor fromPb(com.google.api.LabelDescriptor descriptorPb) {
+      String description = null;
+      if (descriptorPb.getDescription() != null && !descriptorPb.getDescription().equals("")) {
+        description = descriptorPb.getDescription();
+      }
+      return new LabelDescriptor(descriptorPb.getKey(),
+          ValueType.fromPb(descriptorPb.getValueType()), description);
+    }
+  }
+
+  static class Builder {
+
+    private final String type;
+    private String name;
+    private String displayName;
+    private String description;
+    private List<LabelDescriptor> labels = new ArrayList<>();
+
+    Builder(String type) {
+      this.type = type;
+    }
+
+    Builder name(String name) {
+      this.name = name;
+      return this;
+    }
+
+    Builder displayName(String displayName) {
+      this.displayName = displayName;
+      return this;
+    }
+
+    Builder description(String description) {
+      this.description = description;
+      return this;
+    }
+
+    Builder labels(List<LabelDescriptor> labels) {
+      this.labels = labels;
+      return this;
+    }
+
+    MonitoredResourceDescriptor build() {
+      return new MonitoredResourceDescriptor(this);
+    }
+  }
+
+  MonitoredResourceDescriptor(Builder builder) {
+    this.type = checkNotNull(builder.type);
+    this.name = builder.name;
+    this.displayName = builder.displayName;
+    this.description = builder.description;
+    this.labels = checkNotNull(builder.labels);
+  }
+
+  /**
+   * Returns the monitored resource type. For example, the type {@code cloudsql_database} represents
+   * databases in Google Cloud SQL.
+   */
+  public String type() {
+    return type;
+  }
+
+  /**
+   * Returns an optional name for the monitored resource descriptor. If not set, this method returns
+   * {@code null}.
+   */
+  public String name() {
+    return name;
+  }
+
+  /**
+   * Returns an optional concise name for the monitored resource type. This value might be displayed
+   * in user interfaces. For example, {@code Google Cloud SQL Database}. If not set, this method
+   * returns {@code null}.
+   */
+  public String displayName() {
+    return displayName;
+  }
+
+  /**
+   * Returns an optional detailed description of the monitored resource type. This value might be
+   * used in documentation. If not set, this method returns {@code null}.
+   */
+  public String description() {
+    return description;
+  }
+
+  /**
+   * Returns a list of labels used to describe instances of this monitored resource type. For
+   * example, an individual Google Cloud SQL database is identified by values for the labels
+   * {@code database_id} and {@code region}.
+   */
+  public List<LabelDescriptor> labels() {
+    return labels;
+  }
+
+  @Override
+  public final int hashCode() {
+    return Objects.hash(type, name, displayName, description, labels);
+  }
+
+  @Override
+  public final boolean equals(Object obj) {
+    if (obj == this) {
+      return true;
+    }
+    if (obj == null || !obj.getClass().equals(MonitoredResourceDescriptor.class)) {
+      return false;
+    }
+    MonitoredResourceDescriptor other = (MonitoredResourceDescriptor) obj;
+    return Objects.equals(type, other.type)
+        && Objects.equals(name, other.name)
+        && Objects.equals(displayName, other.displayName)
+        && Objects.equals(description, other.description)
+        && Objects.equals(labels, other.labels);
+  }
+
+  @Override
+  public String toString() {
+    return MoreObjects.toStringHelper(this)
+        .add("type", type)
+        .add("name", name)
+        .add("displayName", displayName)
+        .add("description", description)
+        .add("labels", labels)
+        .toString();
+  }
+
+  public com.google.api.MonitoredResourceDescriptor toPb() {
+    com.google.api.MonitoredResourceDescriptor.Builder builder =
+        com.google.api.MonitoredResourceDescriptor.newBuilder()
+            .setType(type)
+            .addAllLabels(Iterables.transform(labels, LabelDescriptor.TO_PB_FUNCTION));
+    if (name != null) {
+      builder.setName(name);
+    }
+    if (displayName != null) {
+      builder.setDisplayName(displayName);
+    }
+    if (description != null) {
+      builder.setDescription(description);
+    }
+    return builder.build();
+  }
+
+  static Builder builder(String type) {
+    return new Builder(type);
+  }
+
+  public static MonitoredResourceDescriptor fromPb(
+      com.google.api.MonitoredResourceDescriptor descriptorPb) {
+    Builder builder = builder(descriptorPb.getType());
+    if (descriptorPb.getName() != null && !descriptorPb.getName().equals("")) {
+      builder.name(descriptorPb.getName());
+    }
+    if (descriptorPb.getDisplayName() != null && !descriptorPb.getDisplayName().equals("")) {
+      builder.displayName(descriptorPb.getDisplayName());
+    }
+    if (descriptorPb.getDescription() != null && !descriptorPb.getDescription().equals("")) {
+      builder.description(descriptorPb.getDescription());
+    }
+    builder.labels(Lists.transform(descriptorPb.getLabelsList(), LabelDescriptor.FROM_PB_FUNCTION));
+    return builder.build();
+  }
+}