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Diffstat (limited to 'src/proguard/classfile/util/ExternalTypeEnumeration.java')
-rw-r--r-- | src/proguard/classfile/util/ExternalTypeEnumeration.java | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/src/proguard/classfile/util/ExternalTypeEnumeration.java b/src/proguard/classfile/util/ExternalTypeEnumeration.java new file mode 100644 index 0000000..6371888 --- /dev/null +++ b/src/proguard/classfile/util/ExternalTypeEnumeration.java @@ -0,0 +1,106 @@ +/* + * ProGuard -- shrinking, optimization, obfuscation, and preverification + * of Java bytecode. + * + * Copyright (c) 2002-2009 Eric Lafortune (eric@graphics.cornell.edu) + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the Free + * Software Foundation; either version 2 of the License, or (at your option) + * any later version. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ +package proguard.classfile.util; + +import proguard.classfile.ClassConstants; + + +/** + * An <code>ExternalTypeEnumeration</code> provides an enumeration of all + * types listed in a given external descriptor string. The method name can + * be retrieved separately. + * <p> + * A <code>ExternalTypeEnumeration</code> object can be reused for processing + * different subsequent descriptors, by means of the <code>setDescriptor</code> + * method. + * + * @author Eric Lafortune + */ +public class ExternalTypeEnumeration +{ + private String descriptor; + private int index; + + + public ExternalTypeEnumeration(String descriptor) + { + setDescriptor(descriptor); + } + + + ExternalTypeEnumeration() + { + } + + + void setDescriptor(String descriptor) + { + this.descriptor = descriptor; + + reset(); + } + + + public void reset() + { + index = descriptor.indexOf(ClassConstants.EXTERNAL_METHOD_ARGUMENTS_OPEN) + 1; + + if (index < 1) + { + throw new IllegalArgumentException("Missing opening parenthesis in descriptor ["+descriptor+"]"); + } + } + + + public boolean hasMoreTypes() + { + return index < descriptor.length() - 1; + } + + + public String nextType() + { + int startIndex = index; + + // Find the next separating comma. + index = descriptor.indexOf(ClassConstants.EXTERNAL_METHOD_ARGUMENTS_SEPARATOR, + startIndex); + + // Otherwise find the closing parenthesis. + if (index < 0) + { + index = descriptor.indexOf(ClassConstants.EXTERNAL_METHOD_ARGUMENTS_CLOSE, + startIndex); + if (index < 0) + { + throw new IllegalArgumentException("Missing closing parenthesis in descriptor ["+descriptor+"]"); + } + } + + return descriptor.substring(startIndex, index++).trim(); + } + + + public String methodName() + { + return descriptor.substring(0, descriptor.indexOf(ClassConstants.EXTERNAL_METHOD_ARGUMENTS_OPEN)).trim(); + } +} |