| /******************************************************************************* |
| * Copyright (c) 2000, 2008 IBM Corporation and others. |
| * |
| * This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License 2.0 |
| * which accompanies this distribution, and is available at |
| * https://www.eclipse.org/legal/epl-2.0/ |
| * |
| * SPDX-License-Identifier: EPL-2.0 |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.core.internal.expressions; |
| |
| import java.util.Arrays; |
| |
| import org.w3c.dom.Element; |
| |
| import org.eclipse.core.expressions.CompositeExpression; |
| import org.eclipse.core.expressions.EvaluationContext; |
| import org.eclipse.core.expressions.EvaluationResult; |
| import org.eclipse.core.expressions.Expression; |
| import org.eclipse.core.expressions.ExpressionInfo; |
| import org.eclipse.core.expressions.IEvaluationContext; |
| |
| import org.eclipse.core.runtime.Assert; |
| import org.eclipse.core.runtime.CoreException; |
| import org.eclipse.core.runtime.IConfigurationElement; |
| |
| public class ResolveExpression extends CompositeExpression { |
| |
| private String fVariable; |
| private Object[] fArgs; |
| |
| private static final String ATT_VARIABLE= "variable"; //$NON-NLS-1$ |
| private static final String ATT_ARGS= "args"; //$NON-NLS-1$ |
| |
| /** |
| * The seed for the hash code for all resolve expressions. |
| */ |
| private static final int HASH_INITIAL= ResolveExpression.class.getName().hashCode(); |
| |
| public ResolveExpression(IConfigurationElement configElement) throws CoreException { |
| fVariable= configElement.getAttribute(ATT_VARIABLE); |
| Expressions.checkAttribute(ATT_VARIABLE, fVariable); |
| fArgs= Expressions.getArguments(configElement, ATT_ARGS); |
| } |
| |
| public ResolveExpression(Element element) throws CoreException { |
| fVariable= element.getAttribute(ATT_VARIABLE); |
| Expressions.checkAttribute(ATT_VARIABLE, fVariable.isEmpty() ? null : fVariable); |
| fArgs= Expressions.getArguments(element, ATT_ARGS); |
| } |
| |
| public ResolveExpression(String variable, Object[] args) { |
| Assert.isNotNull(variable); |
| fVariable= variable; |
| fArgs= args; |
| } |
| |
| @Override |
| public EvaluationResult evaluate(IEvaluationContext context) throws CoreException { |
| Object variable= context.resolveVariable(fVariable, fArgs); |
| if (variable == null) { |
| throw new CoreException(new ExpressionStatus( |
| ExpressionStatus.VARIABLE_NOT_DEFINED, |
| Messages.format(ExpressionMessages.ResolveExpression_variable_not_defined, fVariable))); |
| } |
| return evaluateAnd(new EvaluationContext(context, variable)); |
| } |
| |
| @Override |
| public void collectExpressionInfo(ExpressionInfo info) { |
| ExpressionInfo other= new ExpressionInfo(); |
| super.collectExpressionInfo(other); |
| if (other.hasDefaultVariableAccess()) { |
| info.addVariableNameAccess(fVariable); |
| } |
| info.mergeExceptDefaultVariable(other); |
| } |
| |
| @Override |
| public boolean equals(final Object object) { |
| if (!(object instanceof ResolveExpression)) |
| return false; |
| |
| final ResolveExpression that= (ResolveExpression)object; |
| return this.fVariable.equals(that.fVariable) |
| && equals(this.fArgs, that.fArgs) |
| && equals(this.fExpressions, that.fExpressions); |
| } |
| |
| @Override |
| protected int computeHashCode() { |
| return HASH_INITIAL * HASH_FACTOR + hashCode(fExpressions) |
| * HASH_FACTOR + hashCode(fArgs) |
| * HASH_FACTOR + fVariable.hashCode(); |
| } |
| |
| @Override |
| public String toString() { |
| StringBuilder builder = new StringBuilder(getClass().getSimpleName()); |
| builder.append(" [variable=").append(fVariable); //$NON-NLS-1$ |
| if (fArgs != null) { |
| builder.append(", args=").append(Arrays.toString(fArgs)); //$NON-NLS-1$ |
| } |
| Expression[] children = getChildren(); |
| if (children.length > 0) { |
| builder.append(", children="); //$NON-NLS-1$ |
| builder.append(Arrays.toString(children)); |
| } |
| builder.append("]"); //$NON-NLS-1$ |
| return builder.toString(); |
| } |
| } |