1 files changed, 99 insertions, 0 deletions
diff --git a/org.eclipse.jdt.core/search/org/eclipse/jdt/internal/core/nd/java/NdConstant.java b/org.eclipse.jdt.core/search/org/eclipse/jdt/internal/core/nd/java/NdConstant.java
new file mode 100644
index 000000000..96e604588
--- /dev/null
+++ b/org.eclipse.jdt.core/search/org/eclipse/jdt/internal/core/nd/java/NdConstant.java
@@ -0,0 +1,99 @@
+/*******************************************************************************
+ * Copyright (c) 2015, 2016 Google, Inc and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *   Stefan Xenos (Google) - Initial implementation
+ *******************************************************************************/
+package org.eclipse.jdt.internal.core.nd.java;
+
+import org.eclipse.jdt.internal.compiler.impl.Constant;
+import org.eclipse.jdt.internal.compiler.lookup.TypeIds;
+import org.eclipse.jdt.internal.core.nd.Nd;
+import org.eclipse.jdt.internal.core.nd.NdNode;
+import org.eclipse.jdt.internal.core.nd.field.FieldManyToOne;
+import org.eclipse.jdt.internal.core.nd.field.FieldOneToOne;
+import org.eclipse.jdt.internal.core.nd.field.StructDef;
+
+public abstract class NdConstant extends NdNode {
+	// Parent pointers. Only one will be non-null.
+	// TODO(sxenos): Create something like a union to hold these, to eliminate this
+	// sparse data
+	public static final FieldManyToOne<NdConstantArray> PARENT_ARRAY;
+	public static final FieldOneToOne<NdAnnotationValuePair> PARENT_ANNOTATION_VALUE;
+	public static final FieldOneToOne<NdVariable> PARENT_VARIABLE;
+	public static final FieldOneToOne<NdMethod> PARENT_METHOD;
+
+	@SuppressWarnings("hiding")
+	public static StructDef<NdConstant> type;
+
+	static {
+		type = StructDef.createAbstract(NdConstant.class, NdNode.type);
+		PARENT_ARRAY = FieldManyToOne.createOwner(type, NdConstantArray.ELEMENTS);
+		PARENT_ANNOTATION_VALUE = FieldOneToOne.createOwner(type, NdAnnotationValuePair.class,
+				NdAnnotationValuePair.VALUE);
+		PARENT_VARIABLE = FieldOneToOne.createOwner(type, NdVariable.class, NdVariable.CONSTANT);
+		PARENT_METHOD = FieldOneToOne.createOwner(type, NdMethod.class, NdMethod.DEFAULT_VALUE);
+		type.done();
+	}
+
+	public NdConstant(Nd nd, long address) {
+		super(nd, address);
+	}
+
+	protected NdConstant(Nd nd) {
+		super(nd);
+	}
+
+	public static NdConstant create(Nd nd, Constant constant) {
+		if (constant == Constant.NotAConstant) {
+			return null;
+		}
+
+		switch (constant.typeID()) {
+			case TypeIds.T_boolean:
+				return NdConstantBoolean.create(nd, constant.booleanValue());
+			case TypeIds.T_byte:
+				return NdConstantByte.create(nd, constant.byteValue());
+			case TypeIds.T_char:
+				return NdConstantChar.create(nd, constant.charValue());
+			case TypeIds.T_double:
+				return NdConstantDouble.create(nd, constant.doubleValue());
+			case TypeIds.T_float:
+				return NdConstantFloat.create(nd, constant.floatValue());
+			case TypeIds.T_int:
+				return NdConstantInt.create(nd, constant.intValue());
+			case TypeIds.T_long:
+				return NdConstantLong.create(nd, constant.longValue());
+			case TypeIds.T_short:
+				return NdConstantShort.create(nd, constant.shortValue());
+			case TypeIds.T_JavaLangString:
+				return NdConstantString.create(nd, constant.stringValue());
+			default:
+				throw new IllegalArgumentException("Unknown typeID() " + constant.typeID()); //$NON-NLS-1$
+		}
+	}
+
+	public void setParent(NdConstantArray result) {
+		PARENT_ARRAY.put(getNd(), this.address, result);
+	}
+
+	/**
+	 * Returns the {@link Constant} corresponding to the value of this {@link NdConstant} or null if the receiver
+	 * corresponds to a {@link Constant}.
+	 */
+	public abstract Constant getConstant();
+
+	public String toString() {
+		try {
+			return getConstant().toString();
+		} catch (RuntimeException e) {
+			// This is called most often from the debugger, so we want to return something meaningful even
+			// if the code is buggy, the database is corrupt, or we don't have a read lock.
+			return super.toString();
+		}
+	}
+}